A Novel Slot Array Antenna With a Substrate-Integrated Coaxial Line Technique

In this letter, a novel slot array antenna with a substrate-integrated coaxial line (SICL) technique is proposed. The proposed antenna has radiation slots etched homolaterally along the mean line in the top metallic layer of SICL and achieves a compact transverse dimension. A prototype with 5 × 10 longitudinal slots is designed and fabricated with a multilayer liquid crystal polymer (LCP) process. A maximum gain of 15.0 dBi is measured at 35.25 GHz with sidelobe levels of -28.2 dB (E-plane) and -33.1 dB (H-plane). The close correspondence between experimental results and designed predictions on radiation patterns has validated the proposed excogitation in the end.