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Bangalore, India

Sarkar M.,Indian School of Mines | Dwari S.,Indian School of Mines | Daniel A.,Radar Development Area
Wireless Personal Communications | Year: 2015

In this paper, a compact ultra-wideband (UWB) microstrip-fed printed monopole antenna with triple band-notched characteristics is proposed. The proposed design consists of a radiating patch with two bevels at the bottom edge and the modified ground plane with two bevels of its upper edge to cause the wideband from 3.1 to 10.6 GHz for UWB application. Additionally, a triangular cut is introduced at the upper edge of the ground plane for improving the impedance matching beyond 6 GHz. The band notch at 3.4 GHz is achieved with a pair of slots along patch length and placed symmetrically on both the sides of the patch whereas notch band at 5.2 GHz is achieved using complementary split ring resonator (CSRR) on the patch. The third notch frequency at 5.8 GHz also achieved by using a pair of CSRR on the ground plane. The antenna size is 24 mm × 34.6 mm and designed using FR4 substrate having εr = 4.4 and thickness of 0.8 mm. Design and optimizations have been carried out using HFSS v13.0 and there is good agreement with measured results. The proposed antenna exhibits a nearly omni-directional radiation pattern in the H-plane, and a dipole-like radiation pattern in the E-plane for the entire pass band. © 2015, Springer Science+Business Media New York.

Mishra S.,Radar Development Area | Sarkar M.,Radar Development Area | Daniel A.,Radar Development Area
Journal of Electromagnetic Waves and Applications | Year: 2014

The performance of high frequency weather radars becomes questionable when the antenna system is enclosed by a radome because losses are more at higher frequency. To achieve high performance and accuracy, the radome wall and joints should be designed and optimized properly. Current manuscript presents the detailed study of A-sandwich radome wall and joint characteristics derived for polarimetric Doppler Weather Radar reflector antenna at X-band frequency. The diameter of the reflector antenna is 2.4 m which will be protected by a spherical A-sandwich radome of diameter 4.2 m. Radome wall is optimized by parametric variation of skin and core thickness using Floquets modal analysis in Ansoft HFSS Software package. Performances of radome panel with three different joint cross-sections have been compared in terms of insertion loss and phase variation and the best one is proposed for X-band antenna radome. Measurement was carried out at Compact Antenna Test Facility where the joint of two flat rectangular radome panels was hanged vertically in front of reflector antenna. Simulated results are compared with measured results to validate the proposed design. © 2014 Taylor & Francis.

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