New Concept, Theory, and Advanced Design of Resonant Cavity Antenna

Authors: Koushik Dutta

Source: FERMAT, Volume 39, Communication 3, May-Jun., 2020

Abstract: Resonant Cavity Antenna (RCA) has been explored with a new concept. The superstrate configurations with their new principle of operation have been demonstrated to realize a high gain RCA. Indeed, in here, a nontransparent solid metal sheet has been conceived and implemented as a superstrate for the first time. This approach is successful in removing the previous notion of RCA design using partially reflecting surface (PRS) as superstrate. RCA is actually a class of high gain antenna working based on the principle of Fabry-Perot cavity, where a superstrate layer is placed on top of a primary radiating element (printed or low profile antenna) maintaining a separation of 𝜆/2. A cylindrical dielectric resonator antenna has been used as the primary radiator in this investigation. Present studies based on theory and experimental verifications provide: (i) fully new concept of understanding of Fabry- Perot cavity in microwave domain; (ii) new idea and possibility of using a solid or non-transparent metallic superstrate in realizing an RCA; (iii) concept of aperture field surrounding the superstrate and its contribution to high gain characteristics; (iv) synthesis of superstrate field as a function of superstrate geometry and the technique of improving the radiation/gain patterns.

Index Terms: Resonant cavity antenna, Fabry-Perot cavity antenna, resonance gain antenna, high gain, aperture field, superstrate

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New Concept, Theory, and Advanced Design of Resonant Cavity Antenna