Abstract-Design and development of a low profile, compact, wide beam and wide band printed double layered exponentially tapered slot antenna (DTSA) with a coplanar waveguide (CPW) feed meant for wide scan active phased array antenna in X-band has been presented. DTSA satisfies the requirements on the maximum reflection coefficient of Γ ≤ −10 dB for ±60 • and ±45 • scan from broadside in H-and Eplanes, respectively with a moderate gain of 4-7 dBi. Realized antenna has shown a symmetric pattern together with moderately high gain, low cross-polarization and 3 dB beam width better than ±60 • and ±45 • in H-and E-planes, respectively. The designed structure is expected to find applications in mounting platforms with limited RF real estate available to it like in military aircrafts, owing to its easy integration with the uni-planar monolithic millimeter-wave integrated circuits.

A novel UWB bandpass filter topology with broad stopband rejection is proposed. The experiment filter has 122% 3-dB bandwidth, less than 1.5 dB in-band insert losses, the variation of group delay less than 0.2 ns, and a wide stopband bandwidth with 17 dB attenuation up to 20 GHz. The design method is that the broadband stopband filter is internally embedded within the section between two short-circuited stubs of the broadband bandpass filter, which is not increase the size. With the lowpass and bandpass filter designed separately, the method is more convenient and easily implemented. This compact and high performance lowpass filter should be useful for many broad system applications.

Abstract-This paper studies the performance appraisal of radiation performance of ultra low sidelobe level Active Phased Array Antennas in presence of Multilayer Flat Sandwich Radome. Further, the effect of errors introduced due to amplitude/phase quantisation and planarity of the array surface, on the radiation performance has been studied. Based on these errors, manufacturing tolerances of the Flat Sandwich Radome have been suggested to control the deterioration of radiation performance within tolerable limits. This work is expected to be useful in development/manufacturing of radomes for Active Phased Array Radars and similar applications where ultra low sidelobe levels are required to be maintained.

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