Low-Profile VHF Antenna Based on Quarter-Mode Substrate-Integrated Waveguide Structure

A traditional whip antenna is suitable for terrestrial wireless communication due to its omnidirectional radiation pattern which capable of transmitting and receiving signals from all directions. However, the length a long very high frequency (VHF) band applications; example, ideal 80 cm at 90 MHz, restrains mobility when mounted on vehicle. Many studies have been conducted develop low-profile that can substitute but most them are relatively (GHz) applications. In this paper, planar operating in VHF proposed. The height only 9 by utilizing quarter-mode substrate-integrated waveguide (QMSIW) structure with shorting pins edges. latter promotes radiations despite short height. design was optimized 3D full-wave simulation software. Subsequently, an prototype fabricated tested. results demonstrated resonated 86 MHz maximum gain 1.7 dB along azimuth direction.