| 11. |
- Quan, Yu, 1994, et al.
(författare)
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An Unequal Power Divider Based on Ridge Gap Waveguide
- 2019
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Ingår i: 13th European Conference on Antennas and Propagation, EuCAP 2019.
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Konferensbidrag (refereegranskat)abstract
- This paper proposes a novel unequal power divider based on the ridge gap waveguide technology. Different from the conventional T-junction power divider, the unequal power divider is realized by using a half-height pin structure with an inserted conductor plane. The conductor plane is printed on a thin substrate for the mechanical feasibility. The power division ratio can be controlled by the position of the inserted conductor plane. In this paper, a 1:2 power divider is designed to verify this topology. The reflection coefficient is below -20 dB from 26 GHz to 32 GHz with 20.7% impedance bandwidth and the amplitude discrepancy between the two output ports is about 2.92 dB. Meanwhile, the maximum value of the phase difference is below 12°.
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| 12. |
- Schilliger Kildal, Madeleine, 1987, et al.
(författare)
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Verification of the Random Line-of-Sight Measurement Setup at 1.5-3 GHz including MIMO Throughput Measurements of a Complete Vehicle
- 2020
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Ingår i: IEEE Transactions on Vehicular Technology. - 0018-9545 .- 1939-9359. ; 69:11, s. 13165-13179
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Tidskriftsartikel (refereegranskat)abstract
- The performance evaluation of wireless systems is crucial for the development of future systems with more connected devices. It is essential to have an easy and relevant method for ensuring the wireless communication performance of the devices. We have recently developed a new random line-of-sight (random-LOS) measurement system for evaluating the communication performance of wireless devices, e.g., transceivers and antennas installed on a vehicle. In the measurement system, a plane wave is generated in the test zone emulating the far-field wave transmitted from a radio base station. In this paper we present both numerical simulations and actual experimental results of the random-LOS over-the-air (OTA) measurement setup operating in the 1.5-3 GHz band. The measurement accuracy is determined by the field variations within the test zone, where a smaller variation gives better measurement accuracy. In this paper the achieved accuracy expressed in terms of standard deviation (STD) was evaluated to be approximately 1 dB of the power within a cylindrical test zone of height 0.4 m and diameter 2 m. The active multiple-input multiple-output (MIMO) performance of antenna systems installed on an actual vehicle was measured and evaluated using the presented setup. A comparison to a theoretical zero forcing (ZF) receiver is also presented.
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| 13. |
- Tang, Rao, et al.
(författare)
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Wideband Array Antenna with Hybrid SIGW and RGW Feeding Network
- 2021
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Ingår i: 2021 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2021 - Proceedings.
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Konferensbidrag (refereegranskat)abstract
- In this paper, a 4×4-element linearly-polarized wideband array antenna with a feeding network made of a combination of substrate integrated gap waveguide (SIGW) and ridge gap waveguide (RGW) technologies is proposed. The bowtie dipoles are employed as the radiation elements for the array antenna, and the bandwidth is broadened by using the concept of the tightly coupled array. By employing the hybrid feeding network combining the SIGW with the RGW, a high efficiency can be achieved with a low profile. Based on the simulations by using CST Microwave Studio, the proposed 4×4 array antenna exhibits a relative impedance bandwidth of 34% from 22.7 to 32 GHz, with a maximum gain of 18 dBi.
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| 14. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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An E-band Antenna-diplexer Compact Integrated Solution Based on Gap Waveguide Technology
- 2017
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Ingår i: 2017 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP 2017). - 9781538604656
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Konferensbidrag (refereegranskat)abstract
- In this paper, a novel compact integrated antennadiplexer for Frequency-division duplex low latency wireless backhaul links at E-band is presented. The proposed solution is designed in a multilayer architecture with each layer having different functional blocks. The layers have been stacked on top of each other without any electrical contact requirement between them. This is achieved by using packaging property of gap waveguide technology. A corporate-fed 16 x 16 slot array antenna is integrated with a 5th order diplexer. The simulated reflection coefficients arc better than-13 dB for both input ports in the designed passbands. The simulated realized gains at the middle of channel 1 (73.5 GHz) and channel 2 (83.5 GHz) are respectively 31.8 dBi and 32.9 dBi, obtaining a high isolation of 50 dB between the two input ports.
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| 15. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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An E-band Compact Frequency Division Duplex Radio Front-end Based on Gap Waveguide Technology
- 2019
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Ingår i: 13th European Conference on Antennas and Propagation, EuCAP 2019.
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Konferensbidrag (refereegranskat)abstract
- A compact module consisting of a novel integration of an antenna, a diplexer, and millimeter-wave active circuits for low latency wireless backhaul links working at E-band is presented in this paper. The proposed radio front-end module is built by four distinct layers which are vertically stacked with no electrical contact requirement between them based on gap waveguide technology. A 16×16 corporate-fed slot array antenna is successfully integrated× with a 5th order diplexer, as well as a transmitter (Tx) and a receiver (Rx) monolithic microwave integrated circuits (MMICs) in one package with a novel architecture and a compact form. The integrated radio front-end is able to simultaneously send and receive data by using a frequency division duplex (FDD) transmission scheme at 71-76 GHz and 81-86 GHz bands. A wireless data transmission is successfully demonstrated showing a data rate of 6 Gbit/s using 64 quadrature amplitude modulated (QAM) signal with a spectral efficiency of 4.4 bit/s/Hz. The proposed radio front-end provides the advantages of low loss, high efficiency, compact integration, and a simple mechanical assembly, which makes it a suitable solution for small cell backhaul links.
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| 16. |
- Vosoogh, Abbas, 1984, et al.
(författare)
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W-Band Low-Profile Monopulse Slot Array Antenna Based on Gap Waveguide Corporate-Feed Network
- 2018
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 66:12, s. 6997-7009
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a gap waveguide-based compact monopulse array antenna, which is formed with four unconnected layers, for millimeter-wave tracking applications at W-band (85–105 GHz). Recently developed gap waveguide technology removes the need for galvanic contact among metallic layers of waveguide structures, and thereby, makes the proposed antenna suitable for easy and low-cost manufacturing. In this context, a low-loss planar Magic-Tee is designed to be used in a monopulse comparator network consisting of two vertically stacked layers. The gap waveguide planar monopulse comparator network is integrated with a high-efficiency 16x16 corporate-fed slot array antenna. The measured results of the comparator network show the amplitude and phase imbalance values to be less than 0.5 dB and 2°, respectively, over the frequency band of interest. The fabricated monopulse array antenna shows relative impedance bandwidths of 21% with input reflection coefficients better than −10 dB for the sum and difference ports. The null in the difference radiation pattern is measured to be 38 dB below the peak of the sum radiation pattern at 94 GHz. The measured gain is about 30 dBi for the same frequency. The low-loss performance of the comparator network and the feed network of the proposed array, together with the simple and easy manufacturing and mechanical assembly, makes it an excellent candidate for W -band compact direction-finding systems.
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| 17. |
- Wang, Enlin, 1998, et al.
(författare)
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A 50 dBi E-Band Dual-reflector Antenna for 5G Backhauling with Auto-beam-tracking Function
- 2024
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; In Press
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Tidskriftsartikel (refereegranskat)abstract
- An ultra-high-gain E-band dual-reflector antenna for 5G backhaul with beam tracking function is proposed in this paper. Beam tracking is achieved by defocussing the feed away from the focus point of the sub-reflector, while keeping the interface with the transmit-receive unit stationary by applying a movable gap-waveguide configuration. The antenna has been prototyped and measured. The measured reflection coefficients remain below –10 dB for both horizontal and vertical polarizations over 71 – 86 GHz, almost independent from the offset positions of the feed. The measured radiation patterns agree well with the simulated ones, with a peak gain of about 50 dBi in the band and less than 1 dB gain drop for beam steering within ±2°. Finally, a low-cost and environmentally friendly mechanical tracking system is proposed, prototyped, and tested. Measurements have verified that the tracking system functions well for slow sways.
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| 18. |
- Wang, Enlin, et al.
(författare)
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Wideband High-Gain Circularly Polarized Antenna Array on Gap Waveguide for 5G applications
- 2019
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Ingår i: 2019 International Symposium on Antennas and Propagation, ISAP 2019 - Proceedings.
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Konferensbidrag (refereegranskat)abstract
- A wideband circularly polarized (CP) antenna array based on gap waveguide (GW) is presented in this paper. Firstly, a CP antenna based on septum polarizer is designed as the element for the array. Secondly, the feeding network is composed of T-junctions and realized by ridge gap waveguide (RGW). Then a 16 × 16 antenna array is built up by the elements. The novelty of this antenna is the combination of planar array and septum polarizer based on GW technology to achieve circularly polarization, high gain and high efficiency in wide bandwidth. The proposed array antenna achieves wide impedance bandwidth of 34.5% with the reflection coefficient below -10 dB, and a wide 3-dB axial ratio (AR) bandwidth of 26.5%. The simulated gain is higher than 32 dBic from 24.5 to 32.0 GHz, and the antenna efficiency is larger than 90%.
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| 19. |
- Yang, Jian, 1960, et al.
(författare)
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PCB Based UWB mm-Wave Smart Capped Bowtie Array for 5G Communication Systems
- 2018
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Ingår i: IEEE Antennas and Propagation Society International Symposium. - 1522-3965. - 9781538671023 ; , s. 631-632
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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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| 20. |
- Zhang, Tianling, 1981, et al.
(författare)
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Millimeter-Wave Ultrawideband Circularly Polarized Planar Array Antenna Using Bold-C Spiral Elements with Concept of Tightly Coupled Array
- 2021
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 69:4, s. 2013-2022
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Tidskriftsartikel (refereegranskat)abstract
- An ultrawideband circularly polarized (CP) planar array antenna built by new radiation elements, the bold-C spiral elements, in millimeter-wave band is presented in this article. Using the tightly coupled array (TCA) technique, the embedded CP bold-C spiral element in the infinite array has achieved both impedance bandwidth and 3 dB axial ratio (AR) bandwidth of 50.7% covering 18.1-30.4 GHz for the fixed broadside beam. Then, a feeding network is designed by using the dielectric-based inverted microstrip gap waveguide (DIMGW) technology in order to have a compact layout. An 8× CP planar array based on the proposed radiating element and the feeding network is designed and prototyped. The measured results show that the impedance bandwidth of the whole array for the reflection coefficient below-10 dB is 49% from 18.2 to 30 GHz, and 3 dB AR bandwidth is 44.9% covering 19-30 GHz.
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