Millimeter wave band waveguide-to-probe transition for planar harmonic tag antennas

The paper presents a waveguide-to-probe transition for testing millimeter wave band planar harmonic tag antennas. It discusses in detail the design and the tuning approach for developing the waveguide transition. The transition limits the radiation leakage and is easy to fabricate. However, it is narrow band and could not be used for testing multiple antennas simultaneously. The working of the transition is validated by measuring the return losses of 77 GHz planar harmonic antenna which are in good agreement with the simulated results.