A Novel 3D Cavity Diplexer with Compact Size Using LTCC Technologies for V-band Wireless Communication Systems

摘要

In this article, a novel concept of 3D integrated V-band diplexer, which permitsrnthe realization of compact size using a dual-mode cavity and four single-mode cavities, has beenrnrealized in low-temperature cofired ceramic technologies. The dual-mode cavity resonator actingrnas one resonator for both Rx and Tx filters is developed to generate two resonant modesrn(TE_(102) and TE_(103)) at the center frequency of Rx (56.5–58.5 GHz) and Tx (64–66 GHz) channels,rnseparately. Meanwhile, this dual-mode cavity becomes the interconnect between Rx/Tx channelsrnand help to realize good isolation without using conventional T-junction. In the measurement,rneach filter designed for Rx and Tx channels exhibits excellent performance. Channel-to-channelrnisolations better than 35 dB across the Rx band and better than 32.5 dB across the Tx bandrnare also obtained.