HMSIW Based Filtenna Fed by a Dual Mode SIW Cavity

In this paper, a Half Mode Substrate Integrated Waveguide (HMSIW) based fitenna is proposed in x-band. The filtering characteristic is achieved by using a dual mode SIW based cavity as a feeding element to a HMSIW radiator. The TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">201</inf> and TE<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">103</inf> modes of the dual mode cavity are exploited to achieve the desire performance. The impedance bandwidth of the proposed structure 4.6% (9.75 to 10.21 GHz) at 10 GHz. The realized gain is almost constant at 7.5 dBi in the entire operating frequency range. The overall size of the proposed structure is 1.33λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>× 1λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>×0.067λ<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</inf>.