Planar band-pass filter based on parallel coupling lines
A technology of parallel coupled lines and planar strips, applied in the field of filters, can solve problems such as poor selection characteristics, and achieve the effects of simple and clear design, small size, and simple processing
Pending Publication Date: 2019-05-03
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
There are many ways to realize the planar bandpass filter. The typical ones are step impedance bandpass filter and parallel coupled line bandpass filter. The selection characteristics are not very good without special treatment.
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[0015] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0016] Such as figure 1 As shown, the planar bandpass filter based on parallel coupled lines provided in this embodiment is fabricated on a double-sided copper-clad microstrip board in the form of a printed circuit board, one side of which is a microstrip wiring layer, and the other side is a clad A copper ground plane with a dielectric layer in the middle. The microstrip routing layer is respectively provided with a first feeder port 1 and its first feeder 2, a second feeder port 13 and its second feeder 12, a first resonator R1, a second resonator R2 and a third resonator R3; the fir...
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The invention discloses a planar band-pass filter based on parallel coupling lines, which is manufactured on a double-sided copper-clad micro-strip board in a printed circuit board manner. One surfaceof the board is a micro-strip routing layer, and the other surface of the board is a copper-clad grounding board. The middle part of the board is a dielectric layer. A first feeder port and a first feeder thereof, a second feeder port and a second feeder thereof, a first resonator, a second resonator and a third resonator are respectively arranged on the micro-strip wiring layer. The first resonator, the second resonator and the third resonator are located between the first feeder and the second feeder. The second resonator is located between the first resonator and the third resonator. The first resonator, the second resonator and the third resonator are all composed of microstrip lines with one half wavelength. By adjusting the length of coupling line segments, two transmission zeros can be formed at two sides of the pass band to improve the selection characteristic of the band-pass filter. The filter is simple in structure. The structure of the filter is composed of several mutually coupled resonant units. Meanwhile, the problems of complex design, large size and the like due to the fact that the order number or additional microstrip lines are not increased are solved.
Description
technical field [0001] The present invention relates to the technical field of filters, in particular to a planar bandpass filter based on parallel coupled lines. Background technique [0002] With the rapid development of wireless communication technology, the division between frequency bands is getting finer and finer, so the interference between communication frequency bands is becoming more and more serious, so the performance of the bandpass filter determines the working quality of the communication system. Band-pass filter means to allow waves of a specific frequency band to pass through while shielding other frequency bands. It mainly works on the front stage of the signal transmitting end and the rear stage of the signal receiving end to suppress harmonic and clutter signals and ensure the purity of the required signal. . Therefore, in some specific occasions, the selectivity of the bandpass filter has become a top priority, and a higher selectivity brings lower sig...
Claims
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IPC IPC(8): H01P1/203
Inventor 王云陈继鹏陈付昌
Owner SOUTH CHINA UNIV OF TECH