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Design of a Dual-Band Broadband Antenna Based on Structure Reuse
Huiru Zhang1,2, Junwen Tang2, Zhongjun Yu1,2
1School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 101408, China.
Abstract:
In this paper, a novel dual-band broadband antenna based on structure reuse is proposed. The proposed antenna integrates a slot antenna with a microstrip antenna to achieve dual-band performance. The slot antenna innovatively serves as both a radiating element and a feeding structure for the microstrip antenna, realizing structure reuse and significantly reducing structural complexity. To enhance the dual-band bandwidth, four symmetrically arranged parasitic strips are introduced, effectively extending the low-frequency bandwidth. Additionally, the high-frequency bandwidth is further improved by the introduction of a U-shaped slot. To analyze its working principle, the characteristics of the current and electric field distributions at each resonant point are given. The measured results indicate that in the low-frequency band, the proposed antenna achieves a relative bandwidth of 22.1% and a peak gain of 6.5 dBi. In the high-frequency band, it realizes a relative bandwidth of 13.6% and a peak gain of 4.6 dBi.
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