BAND BALANCED FILTER

摘要

PURPOSE: A balanced filter is provided to broaden an upper stopband by increasing difference between a reference resonance frequency and a first harmonic. CONSTITUTION: A band balanced filter comprises an input port(310), a bandpass filter(340), a balun(350), and a first and a second output ports(320,330). An unbalanced signal is inputted to the input port. The bandpass filter passes through a UHF(Ultra High Frequency) signal. The balun changes the unbalanced signal to a balanced-signal. The first and the second output port output the balanced-signal. The bandpass filter and balun have a laminating structure which includes a plurality of layers.