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Characteristics of H-Plane Rectangular Waveguide Bends Integrated into Thin Substrate

In multilayer microwave integrated circuits such as low-temperature co-fired ceramics (LTCCs) or multilayer printed circuit boards (PCBs), waveguide-like structures can be fabricated in planar form by using periodic metallic via holes called substrate integrated rectangular waveguides (SIRWs) [1]-[2]. The SIRW structures can largely preserve the well-known advantages of conventional rectangular waveguides; it is useful for the design of millimeter-wave circuits such as filters, resonators, and antennas etc.