Dual Frequency Circularly Polarized Microstrip Antenna
Ira Joshi1, Abhishek Joshi2, R. P. Gupta3
1Ira Joshi, Communication & Signal processing, J.N.U., Jaipur, India.
2Abhishek Joshi, Digital communication, R.I.E.T., Jaipur, India.
3R. P. Gupta, Electronics & Communication, J.N.U, Jaipur, India.
Manuscript received on October 04, 2011. | Revised Manuscript received on October 21, 2011. | Manuscript published on November 05, 2011. | PP: 184-187 | Volume-1 Issue-5, November 2011. | Retrieval Number: E0185091511/2011©BEIESP
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Design and analysis of a single-feed arrangement of rectangular patches is proposed, which is capable of providing dual frequency circular polarization along with broadband performance. An antenna is designed on a glass epoxy FR-4 substrate with overall thickness of the structure less than 8 mm or 0.11A0 . Axial ratio bandwidth better than 1.04 % and impedance bandwidth better than 10.89% may be achieved with the proposed geometry. Measured gain and axial ratio variations of the pro-posed antenna with frequency are compared to simulated results for better understanding. The measured E- and H-plane radiation patterns in the entire impedance bandwidth are identical in shape, and the direction of maximum radiations is normal to the patch geometry. In the entire axial ratio bandwidth range of the pro-posed antenna, the E-plane left circularly polarized patterns are nearly 15 dB.
Keywords: Axial ratio bandwidth, broadband, circularly polarized, radiation patterns, rectangular microstrip antenna.