A Novel Substrate Integrated Suspended Line Wideband Leaky-Wave Antenna

A novel compact wideband leaky-wave antenna based on substrate integrated suspended line is proposed. The proposed antenna is designed to be self-packaged format with five substrate layers and embedded air cavities. Asymmetric feeding is utilized to excite the first higher order mode. In order to achieve the suppression of backlobe and impedance matching, the tapered radiator with an etched slot is introduced. According to the measured results, the maximum antenna gain of 15.1 dBi and 50% fractional bandwidth from 7.5 to 12.5 GHz are obtained. Additionally, the self-packaged antenna has good radiation properties with low backlobe and sidelobe. The scanning angle of the measured main beam is about 44° ranging from 10° to 54°.