Abstract-Taking the advantage of common waveguide filters and SIW technology, a new filter structure is proposed. This structure can be implemented for various microwave frequencies by choosing appropriate low loss substrates. An example of suggested structure in Ku band is presented in this paper. The filter is designed and simulated on a low loss RT/Duroid 5880 laminate. The resulted filter has a Quality factor around 150. The main advantage of the structure is low size and cost, simplicity in fabrication, and the ability of integration with other elements of the circuit.
A novel compact dual-mode monopulse cavity backed SIW antenna is proposed. The antenna consists of an array of two circular polarized cavity backed SIW antennas, a dual-mode section and two input ports. TE 10 and TE 20 modes are excited in the multimode section to produce sum and difference pattern, respectively. A prototype of the proposed monopulse antenna at the center frequency of 10 GHz is manufactured. Measured results show 10-dB return loss bandwidth of 4.4%, axial ratio bandwidth of 1.9%, 9.2 dBi gain and 25 dB null depth. The proposed antenna has good monopulse radiation characteristics and can be easily integrated with planar circuits.Index Terms-Circularly polarized antenna, cavity backed, multimode monopulse antenna, substrate integrated waveguide (SIW).
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