volume | PIER Journals

Abstract

This paper proposes a single-layer, low-profile, and compact filtering patch antenna. The antenna requires no additional filtering structures and consists only of a dielectric substrate, a radiating patch etched with both star-shaped slots and L-shaped slots, a feeder line integrated with a quarter-wavelength matching stripline, and a partial ground plane connected to inverted-π branches. Among these components, the radiating patch, feeder line, and inverted-π branches work synergistically to form two radiation nulls on either side of the passband. This not only enhances the frequency selectivity at the band edges but also optimizes the antenna's radiation performance and filtering performance simultaneously. Finally, to verify the validity of the design, a prototype of the antenna is designed, fabricated, and tested, and the measured results are in good agreement with the simulated results. The design achieves a wide impedance bandwidth of 66.5% (2.33-4.65 GHz), a peak realized gain of 4.25 dBi, and an average efficiency of up to 92%. With a size of 35 mm × 29 mm × 0.8 mm, the antenna satisfies the miniaturization requirement and can be applied to various scenarios, including short-range wireless communication and 5G communication.

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Dr. Li Wang

Professor Han Lin

Dr. Chenlu Li