SIW Corporate-Feed Network for Circular Polarization Slot Array Antenna
In this paper, multilayer feeding network for linear slot array antenna is studied. A substrate integrated waveguide (SIW) corporate-feed network for linear slot array antenna based on three layers is presented. This design has eight right-handed circularly polarized radiation elements, one power divider with SMA connector to SIW adapter structure and six SIW power divider by coupling slot method. The feed network and antenna structures has been designed at X-band frequency. The SMA to SIW power divider and SIW power divider by coupling slot has in-phase and out-of-phase feature, respectively. The proposed feeding method takes the advantages of miniaturization of structure compared with the corporate-feed network by T-junctions. Also, proposed network for feeding radiation elements, eliminated undesirable surface current of the coaxial connector transition, which reduction of these currents causes lower side-lobe level at the antenna radiation pattern. Dimensions of manufacture array structure are 132.8 * 23 * 2.4 mm3 and the substrate is Rogers RO4003c. This antenna has the capability to expand the number of elements and feed network for achieving higher gain. Due to the unidirectional radiation pattern, this antenna useful for monopulse radar and automotive radar applications.
KeywordsSlot array antenna Corporate feed network Multilayers Substrate integrated waveguide Circularly polarized
This work was supported by Semnan University. The authors would like to thank Mrs. Abdi, for their useful comments. The antenna measurement was done by Iran Telecommunication Research Center (ITRC). The authors would like to thank all the members of the Communications Technology Research Faculty at ITRC, especially Mr. Solat, Mr. Mirabdolahi, Mr. Akhlaghpasandi, and Mr. Rezayati for their cooperation. Also the authors would like to thank the journal reviewers for their valuable comments which have helped improve the quality of the paper.