Triple-Mode Resonant Planar Antenna with Enhanced Endfire Radiation

A novel design approach to a low-profile, enhanced endfire gain and triple-mode resonant microstrip patch antenna is proposed. A 2.0 -wavelength sectorial magnetic dipole and an annular sector reflector with width of 0.75 -wavelength can be employed to yield enhanced wideband endfire radiation. As validations, prototype antenna is fabricated and verified on a substrate with a relative permittivity of $\varepsilon_{r}=2.65$, and a thin profile of 0.037 -wavelength at the V2X (Vehicle-to-Everything) band. The prototype antenna exbibits a maximum endfire gain up to 4.1 dBi and an impedance bandwidth of 18.0%.