A Multilayer MMIC Filter Using Short-Line Meshes (SLMs)

Miniature low-pass and hand-pass filters that use novel 4-port short-line meshes (SLM) stacked in a multilayer MMIC structure are proposed. The SLM is a periodic structure of very short TFMS lines. It acts as a point connection at low frequencies and as a growing frequency-dependent connection in higher frequency regions. This feature is effectively combined with inductors and capacitors to build a 4-GHz low-pass filter and a 8-GHz band-pass filter with various stop band characteristics on a 1.4 mm × 1.2mm chip.