Planar waveguide antennas for Millimeter-wave systems

Planar waveguide arrays are promising candidates for high gain, high efficiency antennas in millimeter-wave systems. Authors are driving forward a 5 year project on "RF coexisting technology on high speed baseband IC for millimeter wave radio systems" which is supported by Ministry of Internal Affairs and Communications (MIC) funding as well as Industry\´ s participation. This paper introduces the project and the planar waveguide antennas which characterize it. Among various activities in the project, bandwidth enhancement of the series fed hollow waveguide arrays as well as the loss estimation of the post-wall waveguide antennas are discussed in detail.