MHMICs on ceramic substrate for advanced millimeter wave systems

This paper presents the initial design and fabrication results of several new passive millimeter wave circuits integrated on a thin ceramic substrate, having a relative permittivity of 9.9 and a thickness of 127 µm. The work is focused on a Wilkinson power divider, a 90° hybrid coupler, a rate-race coupler and two six-port circuits. Experimental results show wideband characteristics over the millimeter wave V and W bands, allowing therefore their use for high data-rate wireless communication systems and radar sensors.