A High Gain Ku Band Antenna with Circular Polarization Using Hybrid Choke Ring Structure

Abstract

A Novel Hybrid Choke High Gain Antenna (HCHGA) that operates at 15 GHz is presented in this article, HCHGA is a circularly polarized one that effectively mitigates the multipath effects. The proposed antenna has good impedance matching with S₁₁ of −20.99 dB with a gain of 10.26 dB, and an axial ratio of 1.74 dB. The radiation patterns of the antenna are orthogonal to the antenna surface without any nulls. The proposed antenna is fabricated using RT Duroid 5880 substrate. Simulations are done on a basic patch antenna mounted on different types of ground planes including extended flat ground plane, concentric choke ring, and Hybrid choke ring. The effects of variation in the parameters of grooves thickness, grooves height, and grooves shape on antenna performance parameters are observed. The design of the hybrid chokes facilitated higher values of gain and front-to-back ratio development for mitigating the multipath. From the prototype of the proposed antenna, the measured and simulated results are in good agreement with each other and this proposed antenna is suitable for satellite communication applications.

KEYWORDS:

• Circular polarization
• Front to back ratio
• High gain
• Hybrid choke
• Multipath

ACKNOWLEDGEMENT

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Notes on contributors

Akhila John Davuluri

Akhila John Davuluri is assistant professor in the Dept of ECE at Acharya Nagarjuna University College of Engineering and Technology. She received BTech degree in electronics and communication engineering from JNT University, Hyderabad in 2005, and MTech degree from VIT University, Vellore in 2008, and a doctoral student at Acharya Nagarjuna University. Her current research interests include antenna design, microstrip antennas for mobile and satellite applications and medical applications.

Siddaiah Polepalli

Siddaiah Polepalli professor in the Dept. of ECE at Acharya Nagarjuna University. He obtained BTech degree in electronics and communication engineering from JNTUA College of engineering in 1988. He received his MTech degree from SV University Tirupathi, completed his PhD program in JNTU Hyderabad. He is the chief investigator for several outstanding projects sponsored by defense organizations, AICTE, UGC & ISRO. He is currently the Principal of the University College of Engineering and Technology, Acharya Nagarjuna University, Guntur, India. He has taught a wide variety of courses for UG & PG and guided several projects. He has publications in national & international journals & conferences. Email: [email protected]