A New Design Formula of Coupling Coefficient between Antenna and Resonator for Efficient Design of Filtering Antenna

Masataka OHIRA  Kazuma YAMANAKA  Zhewang MA  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.7   pp.744-750
Publication Date: 2016/07/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Simulation Techniques and Their Applications for Electronics)
filtering antenna,  radiation Q factor,  coupling coefficient,  input reflection response,  

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This paper proposes a new design formula of coupling coefficient between antenna and resonator for an efficient design of filtering antennas consisting of an antenna and resonators. The filtering antenna can be designed by introducing a well-established filter design theory. For such a design approach, an external Q factor at input port, coupling coefficients, and a radiation Q factor of the antenna need to be evaluated. However, conventional design methods have a time-consuming procedure, since there are no effective techniques to evaluate the coupling coefficient between resonator and antenna. To solve the problem, we derive the new design formula using only amplitude property of input reflection responses obtained from a coupled structure of resonator and antenna. As an example, a third-order filtering antenna is synthesized, designed, and tested at 2.45 GHz, which numerically and experimentally validates the effectiveness of the derived equation.