Open Stopband Suppressed Half-Mode Substrate Integrated Waveguide Based Leaky-Wave Antenna for Forward and Backward Beam Scanning

In this work, a novel periodic leaky-wave antenna (P-LWA) based on slot-loaded half mode substrate integrated waveguide (HMSIW) is proposed. The P-LWA unit cell contains two identical open-ended stubs spaced close to quarter wavelength apart to suppress the open stopband (OSB). The proposed leaky-wave antenna provides impedance bandwidth with $S$11< −10 dB between 10.3-15.1 GHz. The antenna radiates in the broadside at 12.5 GHz with 14.7 dBi gain and has a peak gain of 17.2 dBi at 14.9 GHz.