Ka-Band Low-Sidelobe-Level Slot Array Leaky-Wave Antenna Based on Substrate Integrated Nonradiative Dielectric Waveguide

Spoof surface plasmon polariton‐fed circularly polarized leaky‐wave antenna with suppressed side‐lobe levels

“…Although the CP LWA in Reference scans from −14° to 16°, its maximum SLL is only −13 dB. The proposed CP LWA scans from −14° to 38°, which is much wider than the LWAs in References . Its maximum SLL is −20 dB, which is lower than those in References .…”

“…The vertically polarized uniform LWAs in References have narrower scanning ranges and longer lengths. The horizontally polarized quasiuniform LWAs in References 26 and 27 scan only in backward or forward directions with narrower scanning ranges. In addition, the SLLs in Reference are only −17.4 dB.…”

“…The horizontally polarized quasiuniform LWAs in References 26 and 27 scan only in backward or forward directions with narrower scanning ranges. In addition, the SLLs in Reference are only −17.4 dB. Although the Goubau‐line‐fed CSR array in Reference with approximate 11.69 λ 0 length radiates a CP wave, its SLLs are less than −16 dB, and its scanning range is from −21° to −17°, which is a bit narrow for many applications.…”

“…However, the SLLs usually deteriorate as the scan angle increases. Various methods have been presented to suppress the SLLs of uniform, quasi–uniform, and periodic LWAs. In References 23 and 24, SIW long slot LWAs with low SLLs were proposed.…”

“…By gradually changing the distance between the long slot and the centerline of the SIW, the attenuation amount α exhibits a tapered distribution along the long slot, which is favorable for reducing the SLLs. In References 26 and 27, the attenuation amounts α are tapered by the degree of transverse slot density, and less than −20 dB SLLs are realized. In Reference , a periodic slotted ridged SIW LWA with wide‐angle scanning and low SLLs was proposed.…”