Abstract
A wideband epsilon negative (ENG) zeroth-order resonant antenna designed on a microstrip line is presented. It has a mushroom structure and its size is only 0.040λ0×0.235λ0×0.073λ0 at 9.2 GHz owing to zeroth-order resonance. The design procedures with closed-form solutions are provided using transmission line theory. The measured (simulated) antenna bandwidth is about 20.0% (13.0%) and antenna gain is 7.1 dBi (7.2 dBi), at 9.2 GHz, despite the compact size.
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