Design of 45-degree Linearly Polarized Substrate Integrated Waveguide-fed Slot Array Antennas

摘要

This paper presents a method of designing substrate integrated waveguide-fed(SIW-fed) slot array antennas. The design theory is based on the circuit model of slot and via aswell as the reflection canceling. To prove the feasibility of this method, a 10-element K-bandSIW-fed 45-degree linearly polarized slot array antenna with uniform power distribution isdesigned. By full-wave simulation, the antenna has a good impedance bandwidth of 7.5% anduniform power distribution. Besides, a maximum gain of 15.3dBi is obtained in the broadsideand the cross polarization is suppressed below -23.5dB in the boresight. This type of SIW-fedslot array antennas can be a good candidate for microwave and millimeter-wave applications,especially for auto-motive collision-avoidance radar systems.