Reconfigurable Full-Metal Circularly-Polarized Cavity-Backed Slot Antenna and Array With Frequency and Polarization Agility

• Published in: IEEE transactions on circuits and systems. II, Express briefs Vol. 70; no. 2; pp. 531 - 535
• Main Authors: Chen, Rui-Sen, Li, Xiao-Dong, Liu, Hao-Lei, Huang, Guan-Long, Wong, Sai-Wai, Taher Al-Nuaimi, Mustafa K., Tam, Kam-Weng, Choi, W.-W.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna array; Antenna arrays; Antenna radiation patterns; Antennas; cavity-backed slot antenna; Circular polarization; Electric fields; frequency and polarization agility; Metals; Polarization; Power dividers; Reconfiguration; Slot antennas; Tuning
• ISSN: 1549-7747; 1558-3791
• DOI: 10.1109/TCSII.2022.3215951

In this brief, reconfigurable circularly-polarized (CP) cavity-backed slot antenna (CBSA) and antenna array with frequency and polarization agility are proposed. Two degenerate modes TE101 and TE011 are respectively perturbed by the metal posts along y-axis (named as MP-1) and x-axis (named as MP-2), and independent frequency tuning is obtained. Then, two crossed slots are placed on the top wall to radiate the electromagnetic energy of TE101 and TE011 modes, respectively. In this context, circular polarization can be realized by setting different lengths of MP-1 and MP-2. Besides, reconfigurable polarization between left-hand and right-hand circular polarization can be realized by exchanging the lengths of MP-1 and MP-2. Meanwhile, reconfigurable operating frequency can be realized by simultaneously increasing or decreasing the lengths of MP-1 and MP-2. In addition, a reconfigurable <inline-formula> <tex-math notation="LaTeX">4{\times }4 </tex-math></inline-formula> CP array without introducing power dividers and without increasing the number of tuning metal posts is further investigated. Finally, the reconfigurable <inline-formula> <tex-math notation="LaTeX">4{\times }4 </tex-math></inline-formula> CP array is fabricated and tested. Reconfigurable frequency, reconfigurable polarization, high total efficiency, and stable radiation pattern are simultaneously obtained. Good agreement between measured and simulated results well validates the proposed design concept.