Design of a compact filtering antenna with multi-adjustable radiation nulls

ABSTRACT

A compact filtering antenna with multi-adjustable radiation nulls is designed. Initially, a conventional aperture-coupled antenna is crafted by fine-tuning positions of the gap and radiation patch, achieving a radiation null. Additionally, an aperture-coupled filtering antenna is created by cascading a resonator with a microstrip feedline. Subsequently, the integration of the aperture-coupled antenna and the filtering antenna results in a dual-slot aperture cross-coupling filtering antenna, with two radiation nulls at both ends of the passband. Finally, a pair of slot lines is etched on the radiation patch, introducing an extra radiation null to enhance selectivity further. The measured results show that the proposed filtering antenna has a bandwidth from 2.44 to 2.64 GHz for |S₁₁|<−10 dB, a peak gain of 5.5 dBi, and three radiation nulls at 2.3, 2.75, and 3.15 GHz enhancing the selectivity.

KEYWORDS:

• Cross-coupling
• filtering antenna
• high selectivity
• radiation nulls

Acknowledgments

This work was supported by the National Nature Science Foundation of China (62071282) and National Science Foundation of Shanxi Province (202203021211295).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Nature Science Foundation of China [62071282]; National Science Foundation of Shanxi Province [202203021211295].