Spectrum Sensing Ultra Wideband Antenna for Cognitive Radio Applications

Volume 20 No 20 (2022)

Manjunatha K H, Shilpa Mehta, Tanuja T C

DOI: 10.48047/NQ.2022.20.20.NQ109027

Abstract

This paper presents the design, testing and validation of an Ultra Wide Band microstrip antenna for spectrum sensing requirements in Cognitive Radio applications. A circular microstrip patch antenna is first designed at 5.8 GHz frequency, and then the size of the ground plane is reduced to increase the bandwidth. For better return loss a cut is made in the ground plane below the feed line. The antenna is simulated using HFSS EM simulation tool. The radiating patch is fabricated on FR4 substrate of thickness 1.6 mm and dielectric constant 4.6. The fabricated antenna is tested using a VNA in anechoic chamber. VSWR and return loss obtained in simulation are well below 2 and -10 dB respectively between 3.6 GHz to 10.1 GHz. Similar results were obtained when practically tested. Measured VSWR, return loss and radiation patterns are presented. The fabricated antenna is then connected to Amitec software defined radio for transmission and reception using narrow band FM modulation in GNU Radio. The photographs of results are presented.

Keywords

UWB Antenna, Cognitive Radio, Software Defined Radio, Spectrum Sensing.

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