Single-Feed Circularly Polarized Flared-U Fractal Boundary Microstrip Antenna

ABSTRACT

A new compact Flared-U-type fractal patch antenna is studied for linear and circular polarization (CP). For linear polarization, patch sides are replaced with symmetrical Flared-U fractal curves. By interchanging the edges of a square structure with asymmetrical Flared-U-type fractal curves in two perpendicular directions, two degenerated orthogonal modes are generated for CP emission. To design compact CP antennas, indentation parameters of the Flared-U-type fractal boundary curves are optimized. All the simulations are carried out using finite-element-method-based HFSS electromagnetic simulation tool. Measured results depict that 10-dB return loss and 3-dB axial ratio bandwidths of the presented iteration order (IO) 1 Flared-U CP antenna 2 are 6.17% and 1.8%, respectively, at operating frequencies of 2300 MHz. Obtained results demonstrate that by deploying fractal boundary curves as sides of the square structure, an excellent CP is achieved.

KEYWORDS:

• Axial ratio bandwidth
• Circular polarization
• Flared-U
• Fractal boundary
• Indentation parameters
• Probe feed

ACKNOWLEDGEMENT

The author thanks M. Chakravarthy, scientist F, Antenna wing, DLRL-Hyderabad, for providing the measurement facilities.

Additional information

Notes on contributors

V. V. Reddy

V.V. Reddy, received his BTech degree (2008) in Electronics and Communication Engineering from Jawaharlal Nehru Technological University, Hyderabad, India. He received his MTech degree (2011) in Advanced Communication Systems from National Institute of Technology, Warangal, India. Recently, he has been awarded with doctorate degree (2016) from National Institute of Technology, Warangal. Currently, he is working as an assistant professor in the Department of ECE, Kakatiya Institute of Technology and Science, Warangal. His field of study is microstrip fractal antennas, and the other area of interest is antenna wave propagation. He has publications in six international journals and eight international conferences.

E-mail: [email protected]