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 degrees) 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 degrees to -8 degrees and 5 degrees to -14 degrees, and the left-handed CP (LHCP) scanning range of the corresponding reflected beam is 31 degrees-6 degrees and -6 degrees to -15 degrees. The measured results are in good agreement with the simulated ones.

Automated summary

This communication presents a periodic mirror-reflected circular-polarized leaky wave antenna with dual-beam scanning in dual polarization types. The antenna unit cell employs two orthogonally separated oblique stubs to create circular polarization. A new method of adding a groove at the junction of stubs within the unit cell is introduced to improve the axial ratio and beam-scanning characteristics. To achieve dual-beam scanning in dual circular polarization, a metallic via is added at the end of the antenna for mirror reflection. The measured results show good agreement with the simulated ones, demonstrating the effectiveness of the proposed antenna design.