A Wideband Filtering Bidirectional Slot Antenna With Parasitic Slots

作者：Chunling Chen · 发表于：IEEE Antennas and Wireless Propagation Letters · 年份：2024 · DOI：10.1109/lawp.2024.3351896 · 被引用次数：13 · 研究领域：Antenna Design and Analysis、Microwave Engineering and Waveguides、Advanced Antenna and Metasurface Technologies

This letter presents a design of a wideband filtering slot antenna with a bidirectional radiation pattern. The design starts from a conventional linear slot antenna. A capacitive coupling structure is utilized to make it easy to match the 50-Ω port. Then, parasitic slots are introduced to couple with the driven slot. Extra resonances are found to broaden the bandwidth. In addition, two radiation nulls are observed to improve the out-of-band suppression. Moreover, a transmission line model is derived. The coupling is modelled by an inductive/capacitive element and the parasitic slot is modelled by a transmission line. They are connected in series and the radiation null occurs at its resonance, which explains the mechanism of the filtering property. A porotype is fabricated and measured to verified our idea. The results show that the proposed antenna has a 10-dB bandwidth of 63.2%, an in-band gain of 3.5-5.6 dBi and an out-of-band radiation suppression more than 9.5 dB. The advantages of wide bandwidth, filtering property and easy fabrication make the proposed antenna suitable for various wireless communication systems.