Compact Single Feed Dual Band Microstrip Patch Antenna with Adjustable Dual Circular Polarization

Abstract

This paper presents a novel dual-band, half E-shaped microstrip patch antenna (HEMSPA) with dual sense polarization. The proposed antenna covers two different frequency bands and radiates electromagnetic waves with left hand circular polarization (LHCP) and right hand circular polarization (RHCP) at lower and upper frequency bands, respectively. The dual frequency is realized by etching four T slits close to the radiating edges of HEMSPA. A shorting bar is adopted to attain LHCP waves at lower band while a vertical slot etched in the patch center aids in achieving RHCP waves at upper band. The proposed antenna has a small frequency ratio of 1.2 and good scalability. It can be easily re-designed for other operating frequencies with dual sense circular polarization (CP) or same sense CP at dual frequencies. The simulated reflection coefficient, axial ratio, and radiation pattern characteristics show a good agreement with the experimental data for dual-band performance. The measured −10 dB impedance bandwidth, 3 dB axial ratio bandwidth, and boresight gain are observed to be 1010 MHz, 70 MHz, 9.27 dBic and 120 MHz, 69 MHz, 6.63 dBic in the lower band, and upper band, respectively. The proposed antenna would be promising for modern wireless communication system applications.

KEYWORDS:

• Circular polarization
• Dual circular polarization
• Dual frequency
• E-shaped patch
• Microstrip patch antenna
• Vertical slit

Acknowledgment

The authors are thankful to Dr Ch. Viswanadham, SDGM, D&E Divison, Bharat Electronics Limited, Hyderabad for extending the Antenna Test Facility for evaluating the proposed antenna. We further would like to thank his staff for their support.

Additional information

Notes on contributors

Bharathi Anantha

Bharathi Anantha was born in Telangana, India in 1978. She completed BTech degree with distinction in electronics & communication engineering (ECE) from Jawaharlal Nehru Technological University Hyderabad (JNTUH) in 2001 and ME in microwave and radar engineering from University College of Engineering, Osmania University, Hyderabad, Telangana, India in 2004. She has completed her PhD in Dept of ECE, JNTUH, Hyderabad. She is presently working as an assistant professor in ECE Dept, University College of Engineering, Osmania University, Hyderabad, India. She has 14.5 years of teaching experience. Her research interests include antenna theory, reconfigurable antennas, radar systems, microwave and RF circuits, ultra wideband (UWB) antennas. She is a Member of IEEE, IETE. Corresponding author. E-mail: [email protected]

Ravi Shankar Reddy Gosula

Ravi Shankar Reddy Gosula was born in Andhra Pradesh, India in 1978; he completed BTech degree with distinction in electronics & communication engineering (ECE) from Jawaharlal Nehru Technological University Hyderabad (JNTUH) in 2001 and ME in systems and signal processing from University College of Engineering, Osmania University, Hyderabad, Telangana, India in 2004. He completed his PhD in Dept of ECE, JNTUA, Anantapur. He is presently working as a professor in ECE Dept, CVR College of Engineering, Hyderabad, India. He has 15 years of teaching experience. His research interests include signal processing for antenna theory. Email: [email protected]