A Dual Frequency Differential Bandpass Filter
A filter and frequency difference technology, which is applied in the microwave and radio frequency fields, can solve the problems of insufficient common-mode signal suppression effect and poor out-of-band selectivity of balanced dual-passband filters, and achieves improved out-of-band selectivity and small size , to achieve the effect of transition transmission
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[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0027] refer to figure 1 , figure 2 , image 3 and Figure 4, a dual-frequency differential bandpass filter, including a dielectric substrate 1, the upper surface of the dielectric substrate 1 is printed with a microstrip resonator, the microstrip resonator is composed of a rectangular split resonant ring and two rectangular openings Folded stepped impedance split resonant ring 2 formed by connecting folded branches with different widths of the resonant ring is used to achieve dual-frequency characteristics. The axis BB' is symmetrical, and the axis BB' is perpendicular to the axis AA'; the first stepped impedance microstrip line 3, the first uniform impedance microstrip line 4 and the U-shaped input microstrip line are printed on one side of the axis AA' 5. The other side is printed with a second stepped impedance microstrip lin...
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