volume | PIER Journals

Abstract

This paper presents a compact, low-profile, single-layer filtering antenna. The antenna features a simple structure, consisting of a substrate, two pairs of U-shaped defected ground structures, a symmetric dumbbell-shaped radiating patch, and a microstrip cross-feed line with asymmetric branches. The symmetric dumbbell-shaped patch and the asymmetric branch feedline collaboratively introduce additional high-frequency resonances, thereby broadening the impedance bandwidth. Furthermore, two pairs of U-shaped slots are etched into the bottom layer to introduce two radiation nulls on both sides of the passband, enhancing the frequency selectivity at the band edges and optimizing the antenna's radiation and filtering performance. To validate the proposed design, a prototype of the antenna was fabricated and measured. The measured and simulated results are in good agreement. The design achieves a wide impedance bandwidth of 48.6% from 3.7 to 6.18 GHz (centered at 5 GHz), a peak realized gain of 4.5 dBi, and a compact overall size of 35 mm × 29 mm × 0.8 mm. Moreover, the antenna structure is simple and easy to fabricate. Benefiting from its superior radiation performance and filtering characteristics, the proposed antenna is well-suited for wireless communication applications in the 5G Sub-6 GHz and WiFi-6E bands.

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Dr. Angen Guo

Professor Zhonggen Wang

Professor Wenyan Nie

Professor Han Lin