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In this paper, two compact antipodal Vivaldi antennas (AVA) with improved Radiation Characteristics are presented. U-typed tapered slot edge (U-TSE) AVA and comb-shaped AVA with U-TSE are simulated and optimized. The −10-dB reflection coefficient bandwidth of comb-shaped AVA spans from 2.3 GHz to 18 GHz (7.83∼1) and covers 15.7 GHz, while the bandwidth of conventional AVA which has the same dimensions...
A novel Ka-band microstrip-to-waveguide transition is presented in this paper. This transition is composed of a tapered coplanar strip (CPS) and a V-antenna which are inserted from E-plane center of a rectangular waveguide end. The mode transformation between waveguide and microstrip is achieved by electric field structural conversion in these two components. The impedance matching was also considered...
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