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An n-pole absorptive reciprocal filter consists of at least 2n single-mode resonators is proved. An absorptive band-pass filter with four-pole Chebyshev response is designed with two four-pole filters and two-quadrature hybrids. The quadrature hybrids are used to divide the signals into two paths. Additional two ports are introduced to absorb the reflected energy. This circuit structure is easy in...
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