| 1. |
- Bencivenni, Carlo, 1986, et al.
(författare)
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Effects of Regular and Aperiodic Array Layout in Multi-User MIMO Applications
- 2017
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538632840 ; 2017-January, s. 1877-1878
-
Konferensbidrag (refereegranskat)abstract
- In MIMO applications, antenna arrays adopt a uniform regular lattice. However, in phased array applications, it is a well-known fact that aperiodic or irregular arrays can offer several advantages. In this paper, we present initial investigations on the effects of regular and aperiodic layouts in Multi-User MIMO applications. We aim at explaining and providing an intuitive understanding on why aperiodic arrays are superior to regular ones. Additional results and quantification of the advantages will be presented in an upcoming journal publication.
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| 2. |
- Botha, Matthys, 1976, et al.
(författare)
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Results in quadrature error estimation for weak near-singular MoM integrals
- 2017
-
Ingår i: 2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538632840 ; 2017-January, s. 1555-1556
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Konferensbidrag (refereegranskat)abstract
- In the method of moments (MoM) for integral equation based numerical electromagnetic field calculation, weakly singular and near-singular surface integrals must be routinely evaluated. Applicable numerical integration schemes are standard Gaussian quadrature or specialized singularity cancellation transformation quadrature. When applying numerical integration, an error is incurred. Qualitative knowledge of the error behaviour and quantitative error estimates are valuable to MoM developers in identifying appropriate quadrature schemes and orders, which lead to increased efficiency and reliability of MoM implementations. An accurate, closed-form error estimate is presented for direct Gaussian product-rule quadrature, as well as for the Radial-Angular-R1-Sqrt transformation scheme.
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| 3. |
- Glazunov, Andres Alayon, 1969, et al.
(författare)
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Reverberating Dreams - the Story of an OTA Chamber
- 2017
-
Ingår i: 2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538632840 ; 2017-January, s. 239-240
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Konferensbidrag (refereegranskat)abstract
- By the late 90's Prof. Per-Simon Kildal came to the insight that reverberation chambers could be useful tools for characterizing small antennas and wireless devices in multipath channels. This was a revolutionizing idea that was not so well received at first. However, with perseverance, he worked through the challenges to see his dream become a reality. This paper is to recognize Prof. Kildal's contributions carried out at Chalmers, the spin-off company Bluetest, but also the contributions of many other people that have been key to materializing his dream.
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| 4. |
- Hosseinzadegan, Samar, 1987, et al.
(författare)
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Comparison of Two Forward Models For Electric Field of Microwave Imaging Systems
- 2017
-
Ingår i: 2017 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538632840 ; 2017-January, s. 969-970
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Konferensbidrag (refereegranskat)abstract
- We propose an alternative numerical method, discrete dipole approximation (DDA), to model the two dimensional electric field of forward solution. Our observations show that discrete dipole approximation can be used as a fast and reliable numerical method on the forward solution of the microwave imaging systems. Two dimensional electric field of the microwave imaging systems has been modelled in finite element method with help of COMSOL Multiphysics as well. The numerical experiments obtained from COMSOL Multiphysics agree well with the discrete dipole approximation approach.
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| 5. |
- Kildal, Per-Simon, 1951, et al.
(författare)
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OTA Testing of 3G-5G Devices with MIMO: From Anechoic Chambers to Reverberation Chambers and ... Back Again?
- 2017
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538632840 ; 2017-January, s. 1697-1698
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Konferensbidrag (refereegranskat)abstract
- The present paper describes the paradigm shift in OTA testing that came with the arrival of the 4G wireless system. The testing was previously mainly done in anechoic Line-Of-Sight (LOS) environments, and now in 4G it is done in reverberation chambers, emulating Rich Isotropic MultiPath (RIMP). Now we are preparing for the 5G wireless system, which is expected to have mm-wave antennas with steerable lobes. This will require OTA testing in anechoic environments again, but with an emphasis on system measurements, i.e. data rate throughput for an arbitrary location and orientation of the user, referred to as Random-LOS.
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| 6. |
- Ludick, D. J., et al.
(författare)
-
Enhancing the Jacobi Method with the CBFM for array antenna analysis
- 2017
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538632840 ; 2017-January, s. 727-728
-
Konferensbidrag (refereegranskat)abstract
- The analysis of sparse, disjoint finite antenna array structures is considered in this work. The Method-of-Moments (MoM) based CBFM-enhanced Jacobi technique is presented, and offers an improvement over the standard iterative Jacobi method in terms of convergence and accuracy. By applying the Characteristic Basis Function Method (CBFM) during each iteration the effect of mutual coupling between the array elements can be accounted for more accurately than in the standard Jacobi method. The convergence rate of the method is found to be better than that of the Jacobi technique.
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| 7. |
- Maaskant, Rob, 1978
(författare)
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Deep Integration: A Paradigm Shift in the Synthesis of Active Antenna Systems
- 2017
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538632840 ; 2017-January, s. 1033-1034
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Konferensbidrag (refereegranskat)abstract
- Deep integration is the visionary future trend of merging conducting, semi-conducting and insulating materials into a single heterogeneous structure that is capable of offering multi-functional RF features. This paper introduces the deep integration concept, describes its potential advantages, lists the key outstanding research challenges, and explains the future perspectives based on historical and current trends in the synthesis of integrated wireless systems for next generation high-frequency applications.
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| 8. |
- Algaba Brazalez, Astrid, 1983, et al.
(författare)
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Design of a Butler Matrix at 60GHz in Inverted Microstrip Gap Waveguide Technology
- 2015
-
Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. ; 2015-October, s. 2125-2126
-
Konferensbidrag (refereegranskat)abstract
- A four-port Butler matrix is designed at 60GHz in the new gap waveguide technology, inverted microstrip type. The simplicity of doing this circuit in a printed technology and the low loss characteristic makes this design very promising. All the different components of the matrix have been designed and optimized and the complete matrix is currently under optimization.
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| 9. |
- Aljarosha, Alhassan, 1982, et al.
(författare)
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Mm-Wave contactless connection for MMIC integration in gap waveguides
- 2016
-
Ingår i: 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016, Fajardo, Puerto Rico, 26 June - 1 July 2016. - 1522-3965. ; , s. 253-254
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Konferensbidrag (refereegranskat)abstract
- A contactless, broadband and low-loss microstrip-to-groove gap waveguide transition operating at W-band is presented. The principle of operation is based on transforming EM fields from the SIW to the ridge gap waveguide mode via electromagnetic coupling. This is advantageous, since the proposed solution avoids the use of metal contact between the SIW and one of the waveguide parts. Furthermore, metamaterial-based gap waveguide technology provides a resonance-free packaging solution.
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| 10. |
- Bantavis, P. I., et al.
(författare)
-
A Wideband Switched Beam Antenna System for 5G Femtocell Applications
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 929-930
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Konferensbidrag (refereegranskat)abstract
- This work introduces a wideband switched beam system for femtocell 5G base stations. The system consists of a 4 x 1 Vivaldi linear array and a 4 x 4 Butler matrix able to operate from 1.9-5.1 GHz. A soft surface is introduced along the outer edges of the vivaldi elements of the array for side lobes and back radiation suppression.
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| 11. |
- Beckman, Claes, 1962-, et al.
(författare)
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On the impact of velocity on the train-to-earth MIMO propagation channel : Statistical observations and qualitative analysis
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : IEEE conference proceedings. - 9781538632840 ; , s. 1865-1866
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Konferensbidrag (refereegranskat)abstract
- We provide measured data collected from 97 trains completing over 7000 journeys in Sweden showing that the throughput over LTE is impacted by train velocity. In order to explain these observations we assume that the underlying causes can be found in the implementation of the MIMO system into LTE Rel. 8 and the diffuse scattering of signals from ground reflections.
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| 12. |
- Björkqvist, Oskar, et al.
(författare)
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A Novel Efficient Multiple Input Single Output RF Energy Harvesting Rectification Scheme
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 1605-1606
-
Konferensbidrag (refereegranskat)abstract
- In this work an implementation of an ambient radio frequency harvesting system utilizing multiple input single output approach is demonstrated. Measurements of typical ambient radiation have been conducted with respect to power levels and frequency to determine which communication signals are suitable for harvesting. The measurement campaign showed that the WiFi frequency band at 2.45 GHz is a good candidate for indoors applications. A Greinacher voltage doubler is used for the rectification. A multiple input single output - MISO scalable scheme approach is implemented that is able to provide a DC differential output voltage. Simulated and experimental results proved the MISO rectenna to be an efficient scheme for RF harvesting.
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| 13. |
- Capek, Miloslav, et al.
(författare)
-
Numerical Benchmark based on characteristic modes of a spherical shell
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - 9781538632840 ; 2017-January, s. 965-966
-
Konferensbidrag (refereegranskat)abstract
- Characteristic modes of a spherical shell are found analytically and compared with numerical solutions acquired from both in-house and commercial packages. These studies led to a proposal of several independent benchmarks, all with analytically known results. Dependence on mesh size, electrical size and other parameters can easily be incorporated. It is observed that all contemporary implementations have limitations.
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| 14. |
- Dahlberg, Oskar, et al.
(författare)
-
A Novel 32 Port Cube MIMO Combining Broadside and Endfire Radiation Patterns for Full Azimuthal Coverage - A Modular Unit Approach for a Massive MIMO System
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 1641-1642
-
Konferensbidrag (refereegranskat)abstract
- In this paper we propose a novel 32 antenna port multiple-input-multiple-output (MIMO)-cube. The total volume of the cube is 320 x 320 x 120 mm(3) . On two faces, endfire radiating linear tapered slot antennas (LTSAs) are placed and on the remaining sides, a mix of both LTSAs and broadside patch antennas are placed. In total 16 LTSAs and 8 dual polarized patches are used. The LTSA is designed to operate at the GSM and 3G bands, from 1.7 to 2.3 GHz. A corrugation pattern is introduced along the edges of the LTSAs covering one face to increase directivity and decrease sidelobes. The LTSAs are placed in two different orientations in order to receive two polarisations. The patch antenna is dual band and dual polarized. It operates in the frequency bands 2.4-2.5 and 5.45-5.6 GHz where Wi-Fi communication is made. The spatial placement, with antennas on all sides of the cuboid, ensures full azimuthal coverage despite the high directivity of the antennas. Using different antennas on different faces of the cube further optimizes the volume efficiency of the cube for azimuthal coverage.
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| 15. |
- de lasson, Jakob R., et al.
(författare)
-
Innovative Multi-Feed-Per-Beam Reflector Antenna for Space-Borne Conical-Scan Radiometers
- 2018
-
Ingår i: 2018 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538671023 - 9781538671023 ; , s. 1729-1730
-
Konferensbidrag (refereegranskat)abstract
- We present an antenna for use on conical-scan space-borne radiometers in C band and demonstrate that stringent radiometric requirements can be met. The antenna consists of a 5 m offset reflector fed by a focal plane array in a multi-feed-per-beam configuration, so far never used in ocean observation missions. We use distinct element beams and two optimization routines for obtaining element excitation amplitudes and phases, and with either routine, and in both x- and y-polarization, compliant beams, with footprint < 20 km, distance to coast < 20 km and accuracy < 0:25 K, are obtained. These results may pave the way for use of focal plane arrays with digital beamforming in future radiometric ocean observation missions.
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| 16. |
- Glazunov, Andres Alayon, 1969, et al.
(författare)
-
Zero-forcing MIMO efficiency in random line-of-sight
- 2016
-
Ingår i: 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016, Fajardo, Puerto Rico, 26 June - 1 July 2016. - 1522-3965. - 9781509028863 ; , s. 331-332
-
Konferensbidrag (refereegranskat)abstract
- We derive the Multiple-Input Multiple-Output (MIMO) efficiency of the Zero-Forcing (ZF) receiver algorithm in Random Line-Of-Sight (Random-LOS). We make use of the Probability-of-Detection (PoD) curves based on the ideal digital threshold receiver model in the derivations. We show that the MIMO efficiency in this case, is mainly determined by two factors: the smallest channel gain of the two available bit streams and the non-orthogonality coefficient. This must be considered when designing antenna systems for efficient communication at higher frequencies since Random-LOS propagation will be dominating.
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| 17. |
- Hosseinzadegan, Samar, 1987, et al.
(författare)
-
Integrating the discrete dipole approximation forward solver with a microwave tomography algorithm
- 2018
-
Ingår i: 2018 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538671023 - 9781538671023 ; , s. 2295-2296
-
Konferensbidrag (refereegranskat)abstract
- The discrete dipole approximation (DDA) has been suggested as a viable alternative method for computing the forward solutions during the iterative reconstruction process used in microwave tomography. While efficient algorithms such as finite difference time domain and finite elements have been successfully used by multiple groups, the forward solution time remains the time-limiting step. The DDA has been shown to be accurate and efficient as a forward solver. However, the configuration of the imaging scenario can have a significant impact on its efficiency. We examine two possible forward solution set-ups and describe the benefits with respect to implementing the DDA.
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| 18. |
- Liao, Qingbi, et al.
(författare)
-
Channel Capacity Analysis of Different Mobile Antenna Array Topologies in the Outdoor Urban Environment for 5G mm Wave System
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 1473-1474
-
Konferensbidrag (refereegranskat)abstract
- The 15 and 28 GHz frequency bands have been identified as interesting candidates for future 5G cellular communication systems. In this paper, based on ray-tracing simulations, we investigate the channel capacities at 15 and 28 GHz for a number of different array processing techniques, including beamforming, spatial multiplexing, and two types of hybrid beamforming. This is done for an 8 x 32 multiple input multiple output system, for the single user case. The hybrid beamforming techniques combines the beamforming and spatial multiplexing techniques, in order to reduce the number of analog-to-digital converters and thereby reducing the system complexity, while still maintaining multiplexing capabilities for improved system capacities. The achieved channel capacities the hybrid beamforming techniques with up to four parallel streams outperforms pure beamforming, but does not reach capacities close to that of full spatial multiplexing. This indicates that the outdoor channel can support multiplexing of more than four parallel data streams to a single user.
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| 19. |
- Mattsson, Martin, et al.
(författare)
-
A high gain Dual-Polarised Differential Rectenna for RF Energy Harvesting
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 1609-1610
-
Konferensbidrag (refereegranskat)abstract
- A rectenna for radio frequency (RF) energy harvesting is presented in this paper. We introduce a novel technique for RF rectification that is based on differential field sampling and a Greinacher voltage doubler rectifier. The proposed rectification antenna is a dual polarized patch with 4 ports that operates for the WiFi frequency band of 2.4-2.5 GHz and has a gain of 6.75 dB at each port. The proposed novel topology doubles the amount of input power accepted for each polarization and then quadruples the overall output power. In addition we have a differential output voltage source that is typically required for the electronics connected to the harvesting system.
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| 20. |
- Miers, Zachary Thomas, et al.
(författare)
-
Restoring characteristic eigenvalues as reactive powers for simple and complex media in surface integral formulations
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - 9781538632840 ; 2017-January, s. 43-44
-
Konferensbidrag (refereegranskat)abstract
- The Theory of Characteristic Modes (TCM) has recently been shown to be beneficial in solving a wide variety of complex electromagnetic problems. However, there are still open issues in using TCM to analyze objects which consist of simple or complex media. Either a volume integral equation (VIE) or a surface integral equation (SIE) is required to solve for the characteristic modes of these objects. Herein, we overview the important issue that the characteristic eigenvalues obtained from SIE formulations are not related to the modal reactive power, unlike the classical TCM definition. A recently proposed solution that restores the modal reactive power interpretation of characteristic eigenvalues is described. A numerical example is provided to demonstrate the differences between the SIE eigenvalues and the restored eigenvalues.
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| 21. |
- Prinsloo, D.S, et al.
(författare)
-
Quad-Mode Antenna for Wide-Scan Sparse Arrays
- 2015
-
Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781479978151 ; 2015-October, s. 1516-1517
-
Konferensbidrag (refereegranskat)abstract
- A conical quad-mode antenna excited through four orthogonal transverse electromagnetic modes is presented. The radiation characteristics of each mode are validated through measurements, illustrating the complimentary nature of the four far-field radiation patterns through which near-hemispherical field-of-view coverage can be achieved.
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| 22. |
- Shah, Waqar Ali, 1987, et al.
(författare)
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W-band spatial power combiner and splitter in gap waveguide technology
- 2016
-
Ingår i: 2016 IEEE Antennas and Propagation Society International Symposium, APSURSI 2016, Fajardo, Puerto Rico, 26 June - 1 July 2016. - 1522-3965. ; , s. 255-256
-
Konferensbidrag (refereegranskat)abstract
- A passive power splitter and combiner has been designed in-between two metallic ground plates using gap waveguide technology. The measured insertion loss is smaller than 2.3 dB and the return loss is larger than 10 dB over the entire W-band (75-110 GHz). The design procedure has been detailed and the simulated and measured results for the proposed structure are shown. The designed structure can be used as a passive power splitter or combiner, as a grid amplifier in a back-to-back RF chain, or as a quasi-optical beamforming component in beam steering antenna arrays.
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| 23. |
- Shi, Shuai, et al.
(författare)
-
On Q-Factor Bounds for a Given Front-to-Back Ratio
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 151-152
-
Konferensbidrag (refereegranskat)abstract
- In this paper, the goal is to solve an antenna current optimization problem minimizing the stored energy with a desired front-to-back ratio. This minimization problem is non-convex, and we use semidefinite relaxation techniques to find the solution. An initial study on the front-to-back ratio of a dipole shape is presented here.
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| 24. |
- Silver, Gustaf, et al.
(författare)
-
Exploiting Antenna Array Configurations for Efficient Simultaneous Wireless Information and Power Transfer
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 1083-1084
-
Konferensbidrag (refereegranskat)abstract
- Different patch antenna array configurations for Simultaneous Wireless Information and Wireless Power Transfer - SWIPT - were simulated and evaluated. The scope of the work is to provide configurations that can be used to minimise the interference between information and power transfer as well as provide some beamforming capabilities. Our assumption for all the evaluated structures are that two receive antennas are used for RF energy harvesting and one antenna is used for information exchange. The choice for two antennas for energy harvesting is based on that a differential DC output full-wave rectifier is used. Our analysis is based on patch antennas.
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| 25. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
-
Millimeter wave Microstrip Fed Slot Array Antenna with PMC Packaging for Future 5G Systems
- 2018
-
Ingår i: 2018 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538671023 - 9781538671023 ; , s. 1513-1514
-
Konferensbidrag (refereegranskat)abstract
- This paper deals with slot array antenna fed by PMC packaged microstrip lines at 30GHz frequency range. The slots are etched in the ground plane of the microstrip substrate. The microstrip feeding line is placed on the other side of the substrate. Also, a PMC layer is placed on top of the feeding microstrip line to stop surface waves or any unwanted field leakage or radiation from the feeding line. In this work, the PMC surface is realized by periodic metal pin structure. The antenna works at 30GHz band with reasonable S-11 and radiation performance.
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| 26. |
- Villiers, Dirk I. L. de, et al.
(författare)
-
Diffraction and Pattern Perturbation Effects in Offset Gregorian Reflector Antennas with Wideband Feeds
- 2015
-
Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781479978151 ; 2015-October, s. 1520-1521
-
Konferensbidrag (refereegranskat)abstract
- The offset Gregorian reflector system of the SquareKilometer Array radio telescope is required to operate with wideband feed (WBF) antennas down to very low frequencies, where reflectors become (electrically) relatively small. The considered WBF technologies are the log-periodic (Eleven) antenna and the quadruple-ridged flared horn. This paper investigates some of the performance degradation effects that are specific for the low frequencies and typical for these WBFs, including the feed pattern perturbations and diffraction. Several performance metrics, such as the antenna receiving sensitivity and side lobe levels are considered.
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| 27. |
- Vosoogh, Abbas, 1984, et al.
(författare)
-
Simple and Broadband Transition Between Rectangular Waveguide and Groove Gap Waveguide for mm-Wave Applications
- 2018
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538671023 ; , s. 1101-1102
-
Konferensbidrag (refereegranskat)abstract
- A vertical wideband transition between a standard WR-15 rectangular waveguide (RW) and groove gap waveguide (GGW) in the V-band is presented. A simple step is applied to achieve a good impedance matching in transition between the RW and the GGW. A back-to-back transition is designed and fabricated to verify the simulation results. The measured results of the fabricated prototype show the insertion loss of less than 0.2 dB and the input reflection coefficient better than -16 dB over almost the whole V-band (50-75 GHz).
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| 28. |
- Wu, Runqi, 1995, et al.
(författare)
-
A Broadband Dual-polarized Capped Bow-tie 2x2 Antenna Array for 28 GHz Band in 5G Systems
- 2018
-
Ingår i: 2018 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING. - 1522-3965. - 9781538671023 ; , s. 825-826
-
Konferensbidrag (refereegranskat)abstract
- With the development of the fifth generation (5G) communications, dual-polarization base station antennas have increasingly attracted a lot of attention. In this paper, a broadband high-efficiency dual-polarized capped bow-tie antenna array is presented. Simulation results show that the bandwidth of the proposed antenna is 24-36.8 GHz, with its return loss better than 10 dB and the stable coverage. The directivities vary from 8 to 12dBi and the relative cross-polar level is below -10dB over the most of band. It has a simple and compact structure, and is ready to be extended for large array antennas with massive MIMO performance used in 5G communications.
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| 29. |
- Xu, Bo, et al.
(författare)
-
RF EMF Exposure of Beam-Steering Slot Array in 5G User Equipment at 15 GHz
- 2017
-
Ingår i: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538632840 ; , s. 177-178
-
Konferensbidrag (refereegranskat)abstract
- Above 6 GHz or 10 GHz, the radio frequency (RF) electro-magnetic field (EMF) exposure of user equipment (UE) is evaluated in terms of free space power density. The RF EMF exposure compliance of the fifth-generation (5G) UE with an 8 x 1 beam-steering slot array is analyzed in this paper. The maximum exposure (ME) and corresponding maximum permissible radiated power (MPRP) are calculated for different regulatory guidelines. The results give a good estimation on the range of compliance distance and MPRP of 5G UE, and provide the insight for the future RF EMF exposure compliance for the 5G communication. More results and comparisons of different sorts of arrays will be presented in the conference.
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| 30. |
- Yang, Jian, 1960, et al.
(författare)
-
PCB Based UWB mm-Wave Smart Capped Bowtie Array for 5G Communication Systems
- 2018
-
Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538671023 ; , s. 631-632
-
Konferensbidrag (refereegranskat)abstract
- This paper gives an overview of the preliminary development of a new antenna technology – the UWB capped Bowtie array antenna aiming to the applications in 5G wireless communication systems. The capped Bowtie antenna has not only the ultra-wideband active reflection coefficient performance but also a UWB stable radiation functions of the array element. A novel solution to the aggregation for tightly coupled capped Bowtie array is also presented briefly in the paper.
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| 31. |
- Young, A., et al.
(författare)
-
Efficient Wideband Gain Modeling for Interferometric Imaging Arrays in Radio Astronomy
- 2015
-
Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781479978151 ; 2015-October, s. 1374-1375
-
Konferensbidrag (refereegranskat)abstract
- Current and future interferometric imaging arraysin radio astronomy may be limited by the accuracy with which various direction-dependent effects, such as the antenna gain patterns, can be corrected. Doing this in an efficient manner during the calibration and imaging process is especially difficult due to these effects often being also baseline-dependent. A newly proposed method, called A-stacking, offers a solution through the use of a parametrized model in which basis functions account for the direction-dependence and the expansion coefficients account for the baseline-dependence. This approach provides a simple trade-off between computational complexity and calculation accuracy. Herein the use of the A-stacking method to model direction-dependent effects over a very wide frequency band is investigated.
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