A Cost-Effective Phaseless Pattern Measurement Method for a CP Antenna in a Submillimeter-Wave Band

In this letter, we present a reflection-based phaseless method for circularly polarized (CP) gain characterization of antennas in the submillimeter-wave and terahertz bands. The broadside gain measurement using this method was demonstrated in the paper “Novel phaseless gain characterization for CP antennas at mm-wave and THz frequencies” (IEEE Trans. Antennas Propag., vol. 63, no. 10, pp. 4263-4270, Oct. 2015). Here, we extend the method to measure the main lobe of the antenna, which can be used for calculation of parameters such as beamwidth and Gaussicity. The method does not require phase consistency between orthogonal measurements and is, therefore, robust to misalignment errors. We present broadside gain and main-lobe pattern measurements in the WR-8 band to demonstrate the usefulness of the method.