W-band on-wafer measurement of uniplanar slot-type antennas

Uniplanar slot-type antennas such as coplanar waveguide fed single- and dual-polarized slot-ring antennas and double folded-slot antennas are characterized using a millimeter-wave network analyzer and on-wafer measurement techniques. The antennas are designed to be mounted on a dielectric lens to minimize power loss into substrate modes and realize high-gain antenna patterns. On-wafer measurements are performed by placing the antenna wafer on a thick dielectric spacer of similar /spl epsiv//sub r/ and eliminating the reflection from the probe station chuck with time-domain gating. The measured results agree well with method-of-moments simulations.