Design of high thermal conductivity and high performance bandpass filter based on HTCC

An eight-order metal cavity waveguide filter with high thermal conductivity and high performance is designed in this paper, based on the HTCC process using high-purity (99.99%) high thermal conductivity aluminum oxide material. Introducing two cross couplings, by changing the coupling intensity of the two cross coupling, the position of transmission zero is regulated, and the passband selectivity of the filter is improved. The influence of cross-coupling variation on transmission zero position is discussed, and the variation trend and thermal simulation results are given. Through simulation optimization, the designed filter achieves an insertion loss of less than 0.15 dB within the passband of 4.8-4.96 GHz, an attenuation of 22 dB at the lower out-of-band frequency of 5 MHz, and an attenuation of 47 dB at the higher out-of-band frequency of 15MHz. It is suitable for 5G communication band and has good practical application prospect.