A Hepta-band Frequency Tunable Patch Antenna for Cognitive Radio Applications

Authors Vijayluxmi Meena1, Prem Pal Singh2, Sudhir Kumar Sharma1, Ravi Gupta3

1Jaipur National University/Jaipur-Agra Bypass, Near New RTO Office, Jagatpura, Jaipur, 302017 Rajasthan, India

2Modern Institute of Technology and Research Centre, Alwar, 301028 Rajasthan, India

3Government Engineering College Jaipur, Jaipur, Rajasthan, 302017 Jaipur, India

Е-mail vijayluxmimeena@gmail.com
Issue Volume 16, Year 2024, Number 2
Dates Received 09 January 2024; revised manuscript received 22 April 2024; published online 29 April 2024
Citation Vijayluxmi Meena, Prem Pal Singh, et al., J. Nano- Electron. Phys. 16 No 2, 02006 (2024)
DOI https://doi.org/10.21272/jnep.16(2).02006
PACS Number(s) 84.40.Ba
Keywords Reconfigurable antenna, PIN diode, Cognitive radio, Tunable antenna, Multiband antenna.

A novel and compact frequency tunable patch antenna for Cognitive radio applications (4-8 GHz) operating on seven different frequencies is presented in this article. Essential characteristics of this antenna are large tuning range and sufficient gain. Radiating patch of the antenna is a circular shaped structure and ground plane is modified with different slotted structure for reconfiguration purpose and capacitors are used to isolate the biasing terminals of the battery from RF power. The radiating patch divided into four parts by cutting slots in required manner and PIN diodes are placed at the appropriate position to reconfigure the antenna. These RF switches vary the length of the slots and also change the resonant frequencies. Frequencies generated by the antenna are 4.62 (4.55-4.68) and 6.68 (6.60-6.84) GHz, 5.33 (5.19-5.47), 5.59 (5.44-5.74), 5.81 (5.70-5.92), 6.12 (5.99-6.26) and 6.96 (6.85-7.15) GHz. Total substrate size of the antenna is 23×24 mm2 with thickness of 1.6 mm. Dielectric substrate material used is FR-4 having dielectric constant of 4.4 and loss tangent 0.002 for simulation and fabrication purpose. Parameters of the antenna are analyzed, and simulation and measured results shows an excellent agreement.

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