Dual-Polarized Multi-Channel 24 GHz Radar Sensor Antenna for High Channel-to-Channel Isolation

Abstract

This article presents a dual-polarized, high gain multi-beam and high T/Rx channel-to-channel isolation antenna module for 24 GHz sensor applications. The proposed antenna is configured to support 2-Tx and 2-Rx channels with a pair of vertically polarized (VP) radiation pattern and a pair of horizontally polarized (HP) radiation pattern. Further, each linearly polarized T/Rx antenna is configured by 2 × 4 array with a multi-layer integrated feed network, resulting in four sets of 2 × 4 array antennas fabricated within a single printed circuit board (PCB). Since multiple RF channels must be ensured with minimal interference, high antenna-to-antenna, including Tx-to-Tx, Rx-to-Rx, and Tx-to-Rx port isolations in the proposed antenna are achieved by multi-layered feed network and four sets of T-shaped magnetic walls. To verify the performance of the proposed structure, a 2-Tx and 2-Rx antenna module was fabricated at 24 GHz. The fabricated antenna showed a measured maximum 10-dB impedance bandwidth of 3.9% with a maximum measured gain of 11.7 dBi, considering both Tx and Rx. Further, the measured channel-to-channel isolations were always better than 35.6 dB at 24 GHz.

Simultaneous Multiresolution Imaging Based on Multimode MIMO-SAR

“…On the other hand, with the increasing complexity of radar system functions, the number of receiving and transmitting antennas on the same platform is increasing. Receiving and transmitting with multiple antennas inevitably results in mutual interference, which reduces antenna isolation and communication capacity [42]. Thus, a device of channel isolation is required in the hardware configuration of the radar system to avoid interference between each channel.…”

On the Design of Dual-Polarised Linear Antenna Arrays with Enhanced Port-to-Port Isolation

“…Dual-polarisation antennas with high port-to-port isolation have wide applications in contemporary radiocommunication systems in order to increase their performance in variable propagation conditions. In case of microwave radar sensors, the sensitivity strongly depends on isolation between the RX input and TX output [1][2][3]. In 2 × 2 MIMO systems, the throughput could be doubled by means of simultaneous emission using two orthogonal polarisations [4].…”

An Experimental Study of Radar-Centric Transmission for Integrated Sensing and Communications

“…Utilizing vertical (V-pol) and horizontal polarizations (H-pol) for radar sensing also enables the radar to capture more information about the targets since some target features may be better acquired in one specific polarization and a dual-polarized radar may also provide a higher signal-to-noise ratio (SNR) [31]. This also mitigates the impact of the interference from other RF devices operating in the same frequency band as the interference is likely to happen in only one of the polarizations [32]. The University College London (UCL) ARESTOR platform [33] was used as the experimental platform on which to validate the proposed DFRC concept.…”