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Application of dual-mode filter techniques to the broadband matching of microstrip patch antennas

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3 Author(s)
A. I. Abunjaileh ; Sch. of Electron. & Electr. Eng., Univ. of Leeds, Leeds West Yorkshire ; I. C. Hunter ; A. H. Kemp

Structures such as square or circular microstrip patch antennas may support two orthogonal resonant modes. The paper presents a new method of utilising the dual-mode property to increase the bandwidth of microstrip antennas. The input impedance of such a dual-mode antenna may be represented as a second-order ladder network of coupled resonators, where each resonator is coupled to a load resistor. A theoretical method for evaluating the coupling values in the network is presented, enabling the bandwidth of a dual-mode antenna to be maximised. A theoretical bandwidth improvement of up to 3:1 is achieved when compared to a single-mode antenna. This is confirmed with an experimental dual-mode circular microstrip patch antenna

Published in:

IET Microwaves, Antennas & Propagation  (Volume:1 ,  Issue: 2 )