Low-loss high-suppression minitype cavity body band-pass filter
A high-rejection, micro-cavity technology, applied in the field of filters, can solve the problems of large volume and insertion loss, and cannot be used in applications, and achieve the effects of high Q value, light weight, and simple circuit structure
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[0009] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0010] Combine figure 1 , The present invention is a low-loss and high-suppression micro-cavity bandpass filter, including a surface-mounted 50 ohm impedance input port P1, an input inductor Lin, a first-stage parallel resonance unit L1, C1, and a first electromagnetic coupling circuit L12, C12, the second-stage parallel resonant unit L2, C2, the second electromagnetic coupling circuit L23, C23, the third-stage parallel resonant unit L3, C3, the third electromagnetic coupling circuit L34, C34, the fourth-stage parallel resonant unit L4, C4, the fourth electromagnetic coupling circuit L45, C45, the fifth-level parallel resonant unit L5, C5, the output inductor Lout, the surface-mounted 50 ohm impedance output port P2 and the ground terminal; the first-level parallel resonant unit L1, C1 is composed of the first The inductor L1 and the first capacitor C1 are conne...
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