Dual-Band Substrate-Integrated Waveguide Leaky-Wave Antenna With a Simple Feeding Way

A dual-band leaky-wave antenna (LWA) based on substrate-integrated waveguide (SIW) is presented in this letter. The proposed antenna consists of two back-to-back slotted SIW arrays fed by two strip lines, which can realize frequency-controlled scanning beams in two bands. The top SIW slotted array working in the low-frequency band radiates scanning beams in the upper-half free space, and the bottom array for the high-frequency band radiates scanning beams in the lower-half free space. The proposed LWA can radiate scanning beams from near broadside to the endfire in two different bands. The realized gains can get 12.9–17.1 dBi in the low band (8.2–9.4 GHz) and 15.9–20.1 dBi in the high band (13.2–15.2 GHz), respectively. The measured results of the fabricated prototype confirm the design theory and simulated results.