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 9 34.6 mm and designed using FR4 substrate having e r = 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 omnidirectional radiation pattern in the H-plane, and a dipole-like radiation pattern in the E-plane for the entire pass band.

In this article, a compact ultrawideband (UWB) microstrip-fed printed monopole antenna with dual band-notched characteristics is proposed. The proposed design consists of a radiating patch with semielliptical shape and the modified ground plane with two bevels on the upper edge of the ground plane to cause the wideband from 3.1 to 10.6 GHz for UWB application. In addition, cutting two semicircular slots on the bottom edge of the ground plane, operating band is further extended above 10.6 GHz. The band notch at the two bands 3.4-3.6 GHz and 5.6-5.8 GHz is achieved using a pair of concentric annular slots with splits in them in opposite side. Fine tuning is possible with adjusting the length and radius of those slots. The antenna size is 24 3 34.6 mm and designed using FR4 substrate having er 5 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 omnidirectional radiation pattern in the H-plane, and a dipole-like radiation pattern in the E-plane for the entire pass band.

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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 Floquet's 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.

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