Investigations on Dual Band Filtering Antenna for Wireless Applications

Authors

  • Makkapati Himaja Department of Electronics and Communication Engineering, National Institute of Technology Andhra Pradesh, Tadepalligudem - 534 101, India
  • S. Yuvaraj Department of Electronics and Communication Engineering, Indian Institute of Information Technology Design and Manufacturing (IIITDM) Kancheepuram, Chennai - 600 127, India

DOI:

https://doi.org/10.14429/dsj.20852

Keywords:

Filtering antenna, Dual-band, Defective ground structure, 5G applications, H-shaped radiating element

Abstract

The paper delineates a unique dual-band filtering antenna that integrates filtering and radiation properties into a single module employing a defective ground structure. The role of a filtering antenna is to remove out-of-band interference from adjacent frequency bands. The proposed configuration consists of a rectangular defective ground structure embedded in the ground plane, along with a filter (designed as a square open loop resonator (SOLR)), and an antenna (designed as an H-shaped radiating element) connected through a coupled line on the substrate's opposite side. The recommended filtenna dimensions are 30 mm × 34 mm × 1.6 mm, functioning at 2.4 GHz and 7.2 GHz. A return loss |S11| < 10 dB occurs at the working frequencies. The H-shaped radiator enables dual-band functionality, and narrowband performance at specified frequencies is achieved by modifying the dimensions of the designed SOLR bandpass filter. Integrating a filter with the antenna element limits the bandwidth to 0.21 GHz, spanning from 2.32 GHz to 2.54 GHz, centered at 2.4 GHz, making it highly suitable for wireless applications. The high-frequency resonance attained at 7.2 GHz (6.46 – 7.56 GHz) is widely employed in short-range radar systems and wireless data communications. Stable gain (> 2 dBi) and radiation patterns are achieved at low and high operating frequencies. The design undergoes simulation, fabrication, and measurement. The validated results strongly correlate, suggesting that the proposed filtering antenna is appropriate for diverse wireless applications.

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Published

2025-05-08

How to Cite

Himaja, M., & Yuvaraj, S. (2025). Investigations on Dual Band Filtering Antenna for Wireless Applications. Defence Science Journal, 75(3), 386–393. https://doi.org/10.14429/dsj.20852