| 1. |
- Bagheri, Alireza, et al.
(författare)
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A 16 × 16 45° Slant-Polarized Gapwaveguide Phased Array With 65-dBm EIRP at 28 GHz
- 2023
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 71:2, s. 1319-1329
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Tidskriftsartikel (refereegranskat)abstract
- A high equivalent isotropic radiated power (EIRP) active phased array antenna is proposed for fifth-generation (5G) communication systems at 28 GHz. The numerical design, measurements of a fabricated prototype, and performance analysis are presented. The antenna design is based on the gapwaveguide technology and consists of $16 \times 16$ single 45° slant-polarized elements. The proposed design uses a low complexity printed circuit board (PCB) structure with only six layers, i.e., a half of the existing wideband solutions. The array antenna incorporates up/downconverter integrated circuits (UDCs) and $1 \times 4$ transceiver beamformer integrated circuits (BFICs). Moreover, a compact and highly efficient transition at the end of each channel of the BFICs has been designed to interconnect the antenna elements with the PCB. The antenna's front-end loss, which includes the feed line, mismatch, and ohmic losses, is only 1.3 dB. The array covers the scanning range of ±60° in the azimuth plane and ±10° in the elevation plane. The $S_{11} < -10$ dB frequency bandwidth is from 26.5 to 29.5 GHz. The maximum EIRP of the antenna is 65.5 dBm at saturation point. The presented design offers a compact, robust, and low-loss performance solution meeting the high transmission power requirements of 5G applications.
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| 2. |
- Meyer, E., et al.
(författare)
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The state of the art in beyond 5G distributed massive multiple-input multiple-output communication system solutions
- 2022
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Ingår i: Open Research Europe. - : F1000 Research Ltd. - 2732-5121. ; 2
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Forskningsöversikt (refereegranskat)abstract
- Beyond fifth generation (5G) communication systems aim towards data rates in the tera bits per second range, with improved and flexible coverage options, introducing many new technological challenges in the fields of network architecture, signal pro- cessing, and radio frequency front-ends. One option is to move towards cell-free, or distributed massive Multiple-Input Multiple-Output (MIMO) network architectures and highly integrated front-end solutions. This paper presents an outlook on be- yond 5G distributed massive MIMO communication systems, the signal processing, characterisation and simulation challenges, and an overview of the state of the art in millimetre wave antennas and electronics.
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| 3. |
- Ren, Qiannan, 1994, et al.
(författare)
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An Automotive Polarimetric Radar Sensor With Circular Polarization Based on Gapwaveguide Technology
- 2024
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 72:6, s. 3759-3771
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a novel design of an automotive polarimetric radar sensor with circular polarization (CP) at 77 GHz band based on gap waveguide technology. The proposed design employs a multiple-input multiple-output (MIMO) configuration with single-CP TX antennas and dual-CP RX antennas, enabling the acquisition of sufficient polarimetric information while reducing the number of transmitters (TXs) by half. Gapwaveguide technology is utilized for the implementation of the multilayer waveguide front-end. Series-fed septum polarizers are employed for the antenna design with low-profile characteristics. Measurement results indicate that the antenna elements enable a high level of cross-polarization across the field of view (FoV). Integration of the waveguide front-end with RF boards is achieved using gap waveguide packaging techniques. Static measurements were conducted on common scattering objects to evaluate the sensor’s performance. Polarimetric rotation signatures of the objects were acquired from the measurements, demonstrating the sensor’s potential for use in object identification tasks. Dynamic measurements were performed to evaluate the sensor’s Doppler response. The assessments indicate a high level of accuracy, confirming the effectiveness of the proposed sensor in analyzing dynamic movements. Overall, the proposed polarimetric radar sensor provides persuasive evidence that gap waveguide technology is a highly promising candidate for the realization of advanced automotive radar front-ends.
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