Microstrip ultra-wideband bandpass filter with good stopband characteristics
An ultra-wideband filter and microstrip technology, applied in waveguide-type devices, electrical components, circuits, etc., to achieve low return loss, good out-of-band suppression, and good frequency selection.
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the embodiments of the present invention are not limited thereto. The front side of the embodiment is shown in Figure 3 (a), and includes the following patterns in the metal upper cladding layer (I) of the microstrip: input feeder (1), the first gradual impedance transmission line section (11), the fifth open circuit transmission line section (12), the sixth open-circuit transmission line section (13), the first short-circuit transmission line section (14), the ninth open-circuit transmission line section (16), the parallel coupling line section ( 30), the first open transmission line section (31), the second open transmission line section (32), the third open transmission line section (33), the fourth open transmission line section (34), the output feeder (2), the second gradual impedance transmission line Section (21), the seventh open-circ...
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