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Open loop coupling band-pass filter based on microstrip capacitive load

A band-pass filter and capacitive load technology, applied in the direction of circuits, waveguide devices, electrical components, etc., can solve the problems that cannot meet the needs and applications well, and the attenuation is small, so as to reduce the filter area and the band gap The effect of increased suppression and elimination of harmonic response

Inactive Publication Date: 2007-09-19
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the parasitic passband effect of the microstrip circuit, the attenuation at the second-order harmonic is small, which cannot well meet the needs and applications in actual circuits.

Method used

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  • Open loop coupling band-pass filter based on microstrip capacitive load
  • Open loop coupling band-pass filter based on microstrip capacitive load
  • Open loop coupling band-pass filter based on microstrip capacitive load

Examples

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Embodiment Construction

[0019] The embodiment and detailed description of the open loop coupling bandpass filter based on the microstrip capacitive load designed by the present invention are as follows. The described embodiment is made on a microwave substrate with a dielectric constant of 2.65 and a thickness of 1mm. The bandpass filter The center frequency is 900MHz.

[0020] As shown in FIG. 3 , the open loop coupled bandpass filter based on microstrip capacitive load designed by the present invention includes input feeder 31 and output feeder 34 , and open loop couplers 32 and 33 based on microstrip capacitive load. In the present invention, on the basis of the traditional open loop coupling bandpass filter shown in Figure 1, two microstrip capacitive loads are connected in stages at the terminals of the open loop couplers 12 and 13 respectively, and the microstrip capacitive loads are located in the open circuit inside the ring coupler and does not affect the coupling between open loop couplers....

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Abstract

The invention disclose an split-ring coupling band-pass filter based on microstrip capacitance load, which includes input feeding line, output feeding line and split-ring coupler, and which is characterized in that the terminal of each split-ring of the split-ring coupler is respectively cascaded connected to a pair of microstrip capacitance load which is disposed inward the split-ring. The invention reduce the area of the filter, by means of the character of slow wave, in a manner of cascaded connecting microstrip capacitance load to the terminal of the split-ring based on traditional split-ring coupling band-pass filter. Meanwhile, for the microstrip capacitance load effect, the bandgap suppression ratio of the filter greatly increases and the harmonic response of the traditional split-ring coupling band-pass filter can be eliminated. The invention can be used in any microwave frequency, and is fit for making substrate material for various microwave circuit.

Description

technical field [0001] The invention belongs to the technical field of microwave microstrip filters, and in particular relates to the structural design of an open loop coupling bandpass filter. Background technique [0002] Filters are a very important device in wireless communication systems, and various types of filters with low cost and high performance have always been indispensable in various radio frequency and microwave circuits. An ideal filter characteristic should be no attenuation in the passband and as large an attenuation as possible in the forbidden band. For some very steep transition band filters, cascading multi-section filters can generally be used to achieve the required performance and increase out-of-band attenuation, but the increase in the number of sections will cause greater insertion loss. Filters with waveguide structures have been widely used in some narrow-band filters because of their high Q value and low insertion loss. However, filters with w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P1/212
Inventor 顾建忠孙晓玮
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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