Frequency-diverse metacavity cassegrain antenna for differential coincidence imaging

Mengran Zhao*, Shitao Zhu, Donal Lynch, Yiheng Nian, Thomas Fromenteze, Mohsen Khalily, Xiaoming Chen, Vincent Fusco, Okan Yurduseven

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
98 Downloads (Pure)

Abstract

In order to solve the low signal-to-noise ratio (SNR) problem of the differential coincidence imaging (DCI) system, a frequency-diverse metacavity Cassegrain antenna (FDMCA) that is able to generate low-correlated bunching radiation patterns is proposed in this paper. The FDMCA is designed according to the Cassegrain antenna form, which consists of a frequency-diverse half-spherical metacavity etched with back-projecting slot arrays and a parabolic reflector. In total 81 useful measurement modes with a bunching angle of 40 ° are obtained from 32 to 36 GHz. Firstly, frequency-diverse field distributions in the metacavity are obtained utilizing a high-dispersion metasurface. Back-projecting slot arrays etched on the metacavity would couple the energy from the metacavity and back-radiate to the reflector. When placing the phase center of the feed source at the reflector focal point, the reflected patterns would be focused. Then, the performance of the proposed FDMCA is evaluated. In total 81 radiation patterns with correlation coefficients under 0.3 are generated. Finally, imaging experiments using the proposed FDMCA are carried out and the target image is reconstructed successfully using the DCI method. Comparative experiments are also implemented under the same conditions using a non-bunching frequency-diverse metasurface antenna to verify the bunching advantage of the FDMCA. The design is validated by simulations and measurements.
Original languageEnglish
JournalIEEE Transactions on Antennas and Propagation
Early online date15 Aug 2023
DOIs
Publication statusEarly online date - 15 Aug 2023

Keywords

  • Imaging
  • microwaves
  • metasurface
  • metamaterial

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