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 3-D 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 (LTCC) 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 multipath coupling diagrams and lumped-element models. The quasi-elliptic dual-mode filters with the appropriate locations of the transmission zeros are then 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 multipole 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 LTCC transceiver modules.