Design and development of wideband RDRA FED with parallel conducting strips chamfered at edges separated by partial matching slab

Abstract

In this article, a compact wideband rectangular dielectric antenna fed using parallel standing strips chamfered at the edges with partial dielectric matching slab is proposed for upper C‐band and X‐band applications. Inclusion of the external conducting strip helps in reducing the size of the DRA, facilitates greater ease of fabrication, and helps in shifting the resonant frequency without varying the size of the DRA. Also chamfering the edges of the conducting strips eradicates the discontinuities in the reactance and thus enhances the bandwidth by 10–12%. Two DRAs with dimensions 4.8 mm × 9.6 mm × 10.6 mm were fabricated. The designed antenna has the broad bandwidth ranging from 6.5 to 13.1 GHz. The proposed antenna has the return loss of −45 dB at 7.0 GHz and the impedance bandwidth up to 75% is achieved. The low value of VSWR suggests that the antenna is broadly lossless. Moreover, a comparison with the DRA fed without the partial conducting strip shows that the size of the DRA is reduced considerably around 25%. A parametric study of the variation with external partial conducting strip and internal conducting strip is also carried out. The measured results and the simulated results of the proposed RDRA (Rectangular Dielectric Resonator Antenna) match considerably well with each other. The proposed antenna has an omni‐directional broadband pattern having the gain of 6.0 dBi. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:695–698, 2017