volume | PIER Journals

Abstract

Herein a circularly-polarized (CP) quad-band compact microstrip antenna is proposed. Its design involves one annular ring radiator having eight symmetrical slots along its boundary and three circular closed ring resonators (CRRs) on the bottom side of the substrate. Resonance frequencies of this antenna have been analyzed first and then tuned to excite desired modes via specially designed feed configuration by applying theory of characteristic modes (TCMs). Evolution process of the antenna geometry shows that the eight symmetrical slots in tandem with the CRRs generate wide impedance bandwidth (IBW), while measured quad CP bands are obtained through uses of an asymmetric ground plane resonating at 5.63 GHz (120 MHz), a cross-shaped slit at 7.69 GHz (650 MHz), a rectangular open loop at 9.91 GHz (1200 MHz), and a tuning stub in the feeding structure at 12.09 GHz (160 MHz). Series of parasitic strips augmented CP radiation and eliminate ripples in the radiation pattern. A low cost FR-4 substrate is used to fabricate the antenna with an optimized dimension of 35×30×1.6 mm³. The measured IBW ranges from 4.36-4.82 GHz, 5.50-5.78 GHz and 5.95 - beyond 14 GHz. The proposed antenna may find suitable applications in C band, X band, and 5 GHz WLAN devices.

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Dr. Reshmi Dhara

Prof. Sanjeev Yadav

Dr. Mahendra Mohan Sharma

Dr. Sanjay Kumar Jana

Dr. Mahesh Chandra Govil