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Optimization of Characteristics of a Simple Microstrip Circular Patch Antenna using Rotable Slot

Satish Reddy Kasarla


In this paper, we have designed a simple circular patch antenna which radiates at 2.8 GHz. A slot is introduced and is rotated along the center axis. We have noticed that the frequency of the antenna is varied as a function of slot orientation. An optimal slot angle is determined based on the return loss and then the slot, patch dimensions are optimized to increase the realized gain and return loss of the antenna significantly. Impedance of the antenna is reduced and radiation efficiency is increased. This antenna can be used as a frequency reconfigurable antenna or for getting very high gain by slot rotation when compared to the original design. All simulations are done in HFSS 14 version; results are then tabulated and presented.


Microstrip circular patch antenna, slot, return loss, radiation, bandwidth, impedance, gain, directivity

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Sewoong Kwon, Hyung Kuk Yoon, Young Joong Yoon. Harmonic Tuning Antennas using Slots and Short-Pins. IEEE Antennas and Propagation Society International Symposium, 2001. 2001; 1: 118–121p.

Warnagiris TJ, Minardo TJ. Performance of a Meandered Line as an Electrically Small Transmitting Antenna. IEEE Trans Antennas Propagat. Dec 1998; 46(12): 1797–1801p. (Pubitemid 128748349)

Lu JH. Broadband Dual-Frequency Operation of Circular Patch Antennas and Arrays with a Pair of L-Shaped Slots. IEEE Trans Antennas Propagat. May 2003; 51(5): 1018–1023p.

Li A, Rahmat-Samii Y. PBG, PMC, and PEC Surface for Antenna Applications: A Comparative Study. In Proc. IEEE AP-S Int. Symp. Dig. Salt Lake City, UT. Jul 16–21, 2000; 2: 674–677p.

Rahmat-Samii Y, Mosallaei H. Electromagnetic Band-Gap Structures: Classification, Characterization and Applications. Proceedings of IEE-ICAP Symposium. Apr 2001; 560–4p.

Sievenpiper D. High-Impedance Electromagnetic Surfaces with a Forbidden Frequency Band. IEEE Trans. Microw. Theory Tech. Nov 1999; 47: 2059–2074p.

Weng LH, et al. An Overview on Defected Ground Structure. Prog Electromagn Res B. 2008; 7: 173–189p.

Balanis Constantine A. Antenna Theory: Analysis and Design. 2nd Edn. New York: John Wiley & Sons; 1997.

Shen LC, Long, Walton MD. Resonant Frequency of a Circular Disc, Printed-Circuit Antenna. IEEE Trans. Antennas Prop. Jul 1977; AP-25(4): 595–596p.


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