Development of Multi-Cavity-Backed Stacked Multi-Resonator Microstrip Antenna

Abstract

This paper analyses the effect of introducing multi-cavity-backing up to four cavities on a two-layered suspended stacked one bottom four top rectangular microstrip antenna. The analysis brings out the concurrent enhancement of bandwidth, gain and isolation between two antennas with progressive cavity-backing up to three cavities. Compared to stacked rectangular microstrip antennas without cavity, the single and triple cavity-backed configurations yielded a 40% and 83% enhancement in bandwidth and 0.80 and 2.20 dB enhancement in gain, respectively. The proposed novel triple cavity-backed one bottom four top rectangular microstrip antenna yields a bandwidth of 65.2% and an average gain of 12.85 dBi with an efficiency of 89%. The triple cavity-backed configuration yielded cross-polarization of less than −50 dB in both E and H planes and two such proposed antennas with rim-to-rim separation of 0.35 λ₀ give uniform isolation better than 40 dB covering the entire bandwidth. Measured results are in close agreement with the simulated one, which validates the performance of the antenna. The proposed antenna is deemed suitable for Through the Wall and Ground Penetrating Radar applications because of the improved characteristics offered by the proposed antenna in the S-band.

Keywords:

• Triple cavity-backed antenna
• Stacked microstrip antenna
• Wide bandwidth
• High gain
• Low cross-polarization
• High isolation

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Krishnendu Raha

Krishnendu Raha received MTech from Indian Institute of Technology Mumbai, India. He was part of the team which planned and commenced the execution of Pan India Army strategic backbone communication network on IPMPLS. Currently, he is pursuing his PhD at Defence Institute of Advanced Technology, DRDO, Pune, India. His area of research involves microwave communication systems and antenna design. Email: [email protected]

K. P. Ray

K P Ray is an MTech in microwave electronics from University of Delhi and PhD from Department of Electrical Engineering IIT, Bombay. He has over 33 years of research/academic experience in the areas of RF and microwave systems/components and was the programme director of SAMEER (MeitY) Mumbai and executed over 50 projects sponsored by various Govt. agencies and industries. Recently, he developed A Microwave Sterilizer, “ATULYA” to neutralize COVID19. He received many awards including the most coveted IETE-Ram Lal Wadhwa Award-2018, IETE-Ranjana Pal Memorial Award-2014 and several research papers awards. Presently, he is the head of the Dept of EE, Defence Institute of Advanced Technology, Pune. Corresponding author. Email: [email protected]; [email protected]