Balanced filter using improved coupling feed line
A balanced filter and an improved technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problem of difficult control of the differential mode high-frequency stopband of the balanced filter, and achieve independent design, good characteristics and low cost. Effect
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[0036] The present invention will be further described below in conjunction with specific embodiments.
[0037] like figure 1 As shown, the balanced filter using the improved coupling feeder described in this embodiment includes input and output ports A1, A2, A3, and A4 (transmission lines with an impedance of 50Ω), and two cascaded improved coupling feeders; wherein An improved coupled feeder line includes a first coupled transmission line A5 and a second coupled transmission line A7 that are mirror-symmetrically distributed with the horizontal center line 00' as the symmetry axis, and a first coupled transmission line A5 and a second coupled transmission line A7 loaded between the first coupled transmission line A5 and the second coupled transmission line A7. A branch A13, the first branch A13 is formed by connecting two mirror-symmetrical transmission lines, the two transmission lines have the same symmetry axis as the first coupled transmission line A5 and the second coup...
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