Narrow-band band-pass filter with wide upper stop band
A bandpass filter and stopband technology, applied in the field of narrowband bandpass filters, can solve problems such as narrow stopband bandwidth, poor stopband suppression, and poor square coefficient, and achieve wide stopband bandwidth, high stopband suppression, Effect of Good Squareness Factor
Inactive Publication Date: 2019-03-29
BEIJING INST OF REMOTE SENSING EQUIP
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Problems solved by technology
[0005] The purpose of the present invention is to provide a narrowband bandpass filter with a wide upper stopband, which solves the problems of narrow stopband bandwidth, poor stopband suppression and poor square coefficient of the traditional microstrip bandpass filter
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[0017] In this embodiment, the narrow-band bandpass filter with a wide upper stop band is arranged on the Rogers4350B dielectric substrate with a thickness of 0.338mm. This embodiment consists of a T-shaped input terminal 1 with a coupled microstrip line, and a The T-shaped output terminal 5, the first U-shaped resonator 2, the second U-shaped resonator 4, an H-shaped connection line 3 with a coupled microstrip line, and the first metallized hole 6 and the second metallized hole 7 composition.
[0018] The T-shaped input terminal 1 is used for feeding in electromagnetic wave signals, and the T-shaped output terminal 5 is used for feeding out electromagnetic wave signals. The T-shaped input end 1 and the T-shaped output end 5 are 50-ohm impedance matching of the band-pass filter.
[0019] The T-shaped input terminal 1 and the first U-shaped resonator 2 are coupled through the first gap 8, the first U-shaped resonator 2 and the H-shaped connecting line 3 are coupled through the...
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Abstract
The invention discloses a narrow-band band-pass filter with a wide upper stop band. The filter consists of a T-shaped input end (1) with a coupled microstrip line, a T-shaped output end (5) with a coupled microstrip line, two U-shaped resonators (2) and (4), an H-shaped connecting wire (3) with a coupled microstrip line, and two metallized holes (6) and (7). The input end is used to feed an electromagnetic wave signal, and the output end is used to feed out the electromagnetic wave signal. One end of each of the two resonators is coupled to one of the input end and the output end through a slit, and the other ends are coupled to both ends of the connecting line through the slit. The bottoms of the two U-shaped resonators are grounded through the metallized holes. The band-pass filter employing the symmetrical structure can effectively suppress a spurious passband and extends the upper stop band. The filter not only occupies a small area, but also has a wide bandwidth of the upper stopband, high suppression of the stop band and a good rectangular coefficient. Therefore, the filter has excellent performances and is easy to integrate, and can be widely used in microwaves and integrated circuits.
Description
technical field [0001] The invention relates to a band-pass filter, in particular to a narrow-band band-pass filter with a wide upper stop band. Background technique [0002] In recent years, wireless communication has developed rapidly, and microwave and integrated circuit systems are widely used. Microstrip filter, as an important component, is widely used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass, while allowing useful signals to pass. In the microwave circuit system, the performance of the filter has a great influence on the performance index of the circuit. It can be said that the quality of the filter directly determines the quality of the product. Therefore, how to design a filter with high performance has a great impact on the design. Microwave circuit system is of great significance. [0003] At present, the miniaturization of filters is mainly achieved by using strongly coupl...
Claims
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Inventor 韩宇
Owner BEIJING INST OF REMOTE SENSING EQUIP