Abstract-A compact Vivaldi antenna array printed on thick substrate and fed by a Substrate Integrated Waveguides (SIW) structure has been developed. The antenna array utilizes a compact SIW binary divider to significantly minimize the feed structure insertion losses. The low-loss SIW binary divider has a common novel Grounded Coplanar Waveguide (GCPW) feed to provide a wideband transition to the SIW and to sustain a good input match while preventing higher order modes excitation. The antenna array was designed, fabricated, and thoroughly investigated. Detailed simulations of the antenna and its feed, in addition to its relevant measurements, will be presented in this paper.

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In this paper we present a new concept for implementing cascaded lowpass filters and multi-layer LPF by employing fl-arrowhead resonators as a defected ground structure (DGS) and as a resonator cell in the upper layer. The effect of the arrowhead area of a DGS on the performance of the conventional LPF is examined. The LPF is designed easily by extracting the equivalent circuit elements of a uniform arrowhead DGS slot and compensating for the capacitance of the transmission line [1]. The proposed multi-layer LPF is 50% shorter than the conventional LPF. Only two cells of the new structure are necessary to obtain better performance by suppressing ripples and enlarging stopband. The measured results show excellent agreement with simulated and equivalent circuit results.