Design and Development of Advanced Cavity - Based Dual - Mode Filters Using Low - Temperature Co - Fired Ceramic Technology for V - band Gigabit Wireless Systems

In this paper, a novel concept of three dimensional integrated V-band dual-mode cavity filters, which permit the realization of a variety of quasi-elliptic responses by creating transmission zeros, has been demonstrated using multilayer low-temperature co-fired ceramic technology. A single cavity resonator is designed to generate a degenerate resonance of two orthogonal modes (TE102 and TE201), enabling dual-mode operation. The appearance and elimination of transmission zeros have been analyzed through the multi-path coupling diagrams and lumped elements models. Then, the quasi-elliptic, dual-mode filters with the appropriate locations of the transmission zeros are developed for receiver and transmitter channels of a V-band transceiver module. Two pre-synthesized, dual-mode cavity filters are vertically stacked with two types of inter-coupling slots (1.rectangular 2. cross) to realize the multi-pole filters for 60 GHz wireless local area network narrowband applications. These proposed filters are the first to be reported and have great potential to be integrated into miniaturized V-band low-temperature co-fired ceramic transceiver modules.