A Periodic Mirror-Reflected Circular-Polarized Leaky Wave Antenna With Dual-Beam Scanning in Dual Polarization Types

A periodic mirror-reflected circular-polarized (CP) leaky wave antenna (LWA) with dual-beam scanning in dual polarization types is reported in this communication. The unit cell of the proposed antenna consists of two oblique stubs that are orthogonally separated (90°) to create a circular polarization. In order to achieve better CP (axial ratio (AR) < 3 dB) and beam-scanning characteristics for the periodic CP antenna, a new method of adding a groove at the junction of stubs within the unit cell is introduced. To realize dual-beam scanning in dual circular polarization, a metal via is added at the end of the antenna to generate a mirror reflection. A mirror-reflected structure is fabricated and measured. The measured results show that the right-handed CP (RHCP) scanning range of the incident beam is −31° to −8° and 5° to −14°, and the left-handed CP (LHCP) scanning range of the corresponding reflected beam is 31°–6° and −6° to −15°. The measured results are in good agreement with the simulated ones.