| 1. |
- Glazunov, Andres Alayon, 1969, et al.
(författare)
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Capacity Gains of (3 × 3)×(3 × 3) MIMO Fixed Links with Planar Aperiodic Sparse Arrays in Pure-LOS Channels
- 2018
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Ingår i: Proceedings of the 2018 8th IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC 2018. ; , s. 734-736
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Konferensbidrag (refereegranskat)abstract
- © 2018 IEEE. Presented is an analysis of the topology of a 3 × 3 element planar (square) array antenna with vertically polarized isotropic antenna elements. The focus has been on fixed multiple-input multiple-output communication links in pure line-of-sight channels. An empirical equation is presented for the mid-elements' relative position on the sides of the square array achieving near-optimal (3 × 3) × (3 × 3) multiple-input multiple-output capacity. It is observed that the position is a function of both the separation distance between transmit and receive antennas and the wavelength of the transmit signal in a similar way as for 3 × 3 systems with linear arrays. The capacity gains of the aperiodic planar array over the uniform planar array antenna configurations are presented. It is shown that considerable capacity gains in capacity can be obtained by choosing the right array topology following a simple design rule.
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| 2. |
- Maaskant, Rob, 1978, et al.
(författare)
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Spatial Power Combining and Splitting in Gap Waveguide Technology
- 2016
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Ingår i: IEEE Microwave and Wireless Components Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1558-1764 .- 1531-1309. ; 26:7, s. 472-474
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Tidskriftsartikel (refereegranskat)abstract
- A single-layer spatial power splitter-combiner structure is packaged in gap waveguide technology. The measured metal-only back-to-back structure features an average insertion loss less than 2.3 dB and a return loss larger than 10 to 20 dB over the entire 75-110 GHz W-band. The design procedure is outlined and the measured and simulated results are shown to be in good agreement. The structure can be used as a stand-alone power splitter and/or combiner (single-mode, all-excited in-phase channels), a quasi-optical beamformer to excite an array of slot antennas in the top ground plane by ridge gap waveguides, or as a back-to-back RF component in grid amplifier designs.
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| 3. |
- Pivnenko, Sergiy, et al.
(författare)
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Using a Conical Horn as Compact Antenna Test Range Feed in Millimetre Bands
- 2022
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Ingår i: 2022 16th European Conference on Antennas and Propagation, EuCAP 2022.
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Konferensbidrag (refereegranskat)abstract
- Using a conical horn as a feed for a single offset-fed Compact Antenna Test Range (CATR) is described. Although such horn has larger variation of the phase centre with frequency and slightly different beamwidth in the E-plane and H-plane within the used field of view, as compared to a specially designed corrugated horn feed, good results were obtained for the measured amplitude and phase variations in the Quiet Zone at mm-band. Some details of application of conventional conical horns as CATR feeds are also explained.
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| 4. |
- Shah, Waqar Ali, 1987, et al.
(författare)
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W-band spatial power combiner and splitter in gap waveguide technology
- 2016
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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
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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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| 5. |
- Svensson, Arne, 1955, et al.
(författare)
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In memory of Professor Per-Simon Kildal
- 2016
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Ingår i: IEEE Antennas and Propagation Magazine. - 1045-9243. ; 58:4, s. 116-117
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Uz Zaman, Ashraf, 1975, et al.
(författare)
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3D Printed Periodic Structures for RF Packaging of Integrated Array Module at sub-6GHz Band
- 2021
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Ingår i: 2021 International Symposium on Antennas and Propagation, ISAP 2021.
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Konferensbidrag (refereegranskat)abstract
- Wideband PMC packaging solution fabricated by low cost 3D printing technology has been proposed as an alternative to conventional metal wall solution for isolating critical active circuits in integrated arrays operating at sub-6GHz. The two proposed periodic structures named as triangular pins and conical pins produce a parallel-plate stopband over the frequency range from 2.5-6GHz and 2.1-5.5GHz respectively. A test structure, containing passive microstrip lines placed on a FR4 substrate, has been used to verify the packaging performance of the proposed 3D printed structures and the measured isolation performance of the newly proposed periodic structures agree very well with the simulated performance. Isolation level better than 40-50dB has been demonstrated within the band of interest.
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| 7. |
- Albadalejo Lijarcio, Juan Luis, 1994, et al.
(författare)
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Low-cost Coaxial Slot Array Antenna for E-band Automotive Corner Radar Applications Based on Gap Waveguide MLW Technology
- 2024
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Ingår i: 18th European Conference on Antennas and Propagation, EuCAP 2024.
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Konferensbidrag (refereegranskat)abstract
- This paper presents an E-band automotive radar antenna based on multilayer waveguide (MLW) technology. The electromagnetic fields propagate through a low-loss air-filled coaxial transmission line created by the stacking of three separate metal sheets. The fundamental antenna element consists of a single side-fed column composed of six in-line slots. An electromagnetic bandgap (EBG) structure is integrated along the transmission lines to mitigate the unwanted leakage resulting from small air gaps between the metal sheets. The fabrication of the prototype was realized by using a quick and cost-effective sheet metal manufacturing process, which has proven to be highly suitable for large-scale production. The measurement results for both radiation pattern and reflection coefficient agree with the corresponding simulations within the operating frequency band ranging from 76 to 81 GHz. The measurements results demonstrate a return loss better than 10 dB across the designated frequency band and the realized gain of the antenna is, on average, 11.5 dBi, with a beam width of 120 degrees in azimuth (E-plane) and 20 degrees in elevation (H-Plane).
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| 8. |
- Albadalejo Lijarcio, Juan Luis, 1994, et al.
(författare)
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Substrate-Less Vertical Chip-to-Waveguide Transition for W-Band Array Antenna Integration
- 2023
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Ingår i: 2023 17TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, EUCAP. - 2164-3342. - 9788831299077
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Konferensbidrag (refereegranskat)abstract
- This paper presents a vertical transition from a high permittivity GaAs MMIC to rectangular waveguide using bondwires as a coupling structure. The transition is advantageous for the direct integration of any off-the-shelf chip into a waveguide antenna since no modification of the GSG-pad or additional substrate is needed. An EBG structure consisting of pins is used for the packaging of the chip in order to avoid field propagation in undesired directions. The simulations results show that the reflection coefficient is lower than -10 dB and the average insertion loss is better than 0.5 dB from around 87 to 101 GHz (14% relative bandwidth).
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| 9. |
- Alfonso Alos, Esperanza, 1979, et al.
(författare)
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Gap waveguide components for millimeter-wave systems. Couplers, filters, antennas, MMIC packaging
- 2012
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Ingår i: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9784885522703 ; , s. 243-246
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Konferensbidrag (refereegranskat)abstract
- Design of passive components (couplers, filters and antennas) and MMIC packaging validation intended for RF front ends for microwave links at 38 GHz using gap waveguide technology have been shown. The use of this technology allows all-in-one integration of receiver, transmitter, and diplexer including the antenna into one mechanical unit. These initial designs and studies have been made at the microwave band for validation and measurement purposes, and for comparison with existing technology. They represent the first step towards the application of gap waveguides to millimeter-wave systems, where gap waveguides could have a large potential.
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| 10. |
- Alfonso Alos, Esperanza, 1979, et al.
(författare)
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Ka-Band Gap Waveguide Coupled-Resonator Filter for Radio Link Diplexer Application
- 2013
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Ingår i: IEEE Transactions on Components, Packaging and Manufacturing Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 2156-3985 .- 2156-3950. ; 3:5, s. 870-879
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Tidskriftsartikel (refereegranskat)abstract
- Gap waveguide technology represents an interesting alternative as low-loss, cost-effective, and high-performance transmission line and package of microwave and millimeter-wave systems. A Ka-band coupled-resonator filter for a radio link diplexer, which requires high selectivity to isolate transmit and receiving channels, is proposed and realized using gap waveguide technology. The band-pass filter, which has a central frequency of 37.37 GHz and a pass bandwidth of 560 MHz, is fabricated between two parallel metal plates, leaving an air gap between them. After milling one of the plates, silver-plating is applied on them. Measurements show a minimum in-band insertion loss of 1 dB and agree quite well with simulations.
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