Multilayer low temperature co-fired ceramic（LTCC） millimeter wave filters using two kinds of embedded resonators are presented.One is double ring resonator and the other is trapezoid resonators with fractal shape defection.The LTCC filters implemented in a strip line configuration have a volume of 5.5 mm×2.5 mm×0.6 mm.The design of two kinds of structure of filters are optimized by full-wave analysis software.The filters are fabricated and measured.The measured results are in good agreement with simulated ones

which shows that the filter exploits double ring resonator have a central frequency of 31.5 GHz with 10 % relative band width

the insertion loss and return loss are 1.2

11.4

dB in band respectively

the filter exploits fractal trapezoid shape resonators have 26.3 % relative band width which is 30.1

3

9.20 GHz

the insertion loss and return loss are less than 1.9

11.2 dB in band respectively.Those results verify the proposed filters for millimeter wave communication systems is valid and effective.