Measured Performance of Microstrip-Line-Fed Broadband Waveguide Aperture Antenna

Millimeter-wave technologies are expected to realize broadband high-speed wireless communication systems for home server and HD video transmission. Multi-layer substrate such as LTCC configuration is well-known to integrate many RF-circuits into small area of the substrate [1]. We have already been developed broadband microstrip-to-waveguide transitions composed of a substrate and metal parts [2]. Furthermore, transitions on a multilayer substrate without the metal back-short waveguide block also have developed to prevent performance degradation due to shift of the back-short waveguide from the waveguide center [3]. Then, we apply former transitions to an antenna and microstrip-line-fed broadband waveguide aperture antenna is developed as a first step. A novel antenna is proposed to operate over broad frequency bandwidth in the millimeter wave band. Simulated and measured performances are presented in this paper.