| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 102 === In this paper, a microstrip patch antenna loaded with mushroom-like structure is presented. Mushroom-like structure is composed of a mushroom with two L-shaped slots. This composite right/left-handed (CRLH) structure can excite zeroth-order res-onance (ZOR) and first-positive-order resonance (FPOR). This antenna has dual mode pattern includes monopolar and patch-like radiation pattern. ZOR frequency generates monopolar radiation pattern, FPOR generates patch-like radiation pattern. Generally speaking, FPOR frequency and first- negative-order resonance (FNOR) are restricted to the number of unit cells. Once the number of the unit cells is decided, the FPOR frequency cannot be adjusted. The first order resonance frequency of our proposed antenna can be adjusted by varying spacing of two L-shaped slot so that the FPOR frequency can be reduced.
Proposed antenna consists of mushroom-like structure in the bottom and top mi-crostrip patch, and air layer is between twos substrates. As microstrip patch stacked with mushroom-like structure, antenna revealed triple-band behavior, and the third frequency can be determined by top patch size. Antenna is working in 2.31 GHz, 2.92 GHz, 3.7GHz.
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