SIW Filter Doubles as Balun to mmWave Frequencies (.PDF Download)

Bandpass filters are among the most useful building-block high-frequency components in modern communications networks, for functions such as providing signal isolation and spectral cleaning. Waveguide bandpass filters provide outstanding electrical performance, but are relatively large in size. However, substrate-integrated-waveguide (SIW) transmission-line technology delivers good performance from compact planar formats such as printed circuit boards (PCBs), and can be readily integrated

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