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Differential dual-frequency band-pass filter with high selectivity

A dual-band pass, high-selectivity technology, applied in the microwave and radio frequency fields, can solve the problems of low out-of-band suppression, poor frequency band selectivity, large operating loss, etc., to achieve miniaturization and integration, reduce volume, reduce The effect of complexity

Active Publication Date: 2019-05-14
XIDIAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this design are that there are no obvious transmission zeros on the left and right sides of the third passband and the fourth passband of the filter, the frequency band selectivity is poor, and the operating loss is also large, so it is still necessary room for improvement
However, because there is no transmission zero on the left side of the first filtering passband of the filter, it has the defects of poor selectivity and low out-of-band rejection

Method used

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  • Differential dual-frequency band-pass filter with high selectivity
  • Differential dual-frequency band-pass filter with high selectivity
  • Differential dual-frequency band-pass filter with high selectivity

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Embodiment 1

[0020] As an essential and important device in the modern communication field, the filter selects the frequency of the signal, and passes or blocks, separates or synthesizes certain frequency signals in the communication system. The filter with a differential structure can eliminate external noise interference on the premise of ensuring its own working characteristics, so it has better filtering performance. At the same time, the introduction of a dual-frequency filter with a differential structure not only improves communication efficiency and alleviates channel congestion, but also helps reduce system size and complexity of system design. With the development of modern communication technology, the research and design of differential dual-frequency / multi-frequency band-pass filters are constantly improving and developing, but the existing differential dual-frequency / multi-frequency band-pass filters still have poor frequency selectivity. Insufficient insertion loss is too la...

Embodiment 2

[0025] The overall composition of the differential dual-bandpass filter with high selectivity is the same as that in Embodiment 1. The dual-bandbandpass resonator of the present invention consists of a first uniform impedance resonant ring 3 and a second uniform impedance resonant ring 4 . The second uniform impedance resonant ring 4 in the present invention is symmetrical with respect to the horizontal axis BB' of the dielectric substrate, produces a transmission pole in the first frequency band, and forms a low-frequency passband in the range of 1.5GHz-1.8GHz of the differential dual-frequency bandpass filter. The first uniform impedance resonant ring 3 in the present invention is symmetrical about the horizontal axis BB' of the dielectric substrate, and generates a transmission pole in the second frequency band, forming a high-frequency passband in the range of 2.3GHz-2.6GHz of the differential dual-band bandpass filter. The first uniform impedance resonant ring 3 and the se...

Embodiment 3

[0027] The overall composition of the differential dual-band bandpass filter with high selectivity is the same as that of Embodiment 1-2. In the present invention, the L-shaped ladder impedance input microstrip line 6 is input from the port to the microstrip line 6-1 and the L-shaped open circuit branch 6-2. Connection composition, wherein the length of the L-type open-circuit stub 6-2 is a quarter wavelength, and its width is greater than the width of the port input microstrip line 6-1; the L-type ladder impedance output microstrip line 7 in the present invention is output by the port The microstrip line 7-1 is connected with the L-shaped open stub 7-2, and the length of the L-shaped open stub 7-2 is a quarter wavelength, and its width is greater than the width of the port output microstrip line 7-1. In the present invention, the overall structure composed of the port input microstrip line 6-1, the port output microstrip line 7-1 and the L-shaped open branch 7-2 is symmetrical...

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Abstract

The invention discloses a differential dual-frequency band-pass filter with high selectivity. By the differential dual-frequency band-pass filter with high selectivity, the problem of poor out-of-bandselectivity in design of the differential dual-frequency band-pass filter is solved. A first uniform impedance resonant ring, a second uniform impedance resonant ring, an input microstrip line and anoutput microstrip line are arranged on an upper surface of a dielectric substrate, the first uniform impedance resonant ring and the second uniform impedance resonant ring are embedded to each other,the input microstrip line and the output microstrip line are symmetric to each other, and a step impedance gap line comprising a central loading branch is arranged on a lower surface. L-shaped open-circuit branches are loaded on the input / output microstrip lines, the central loading branch of the gap line passes through a projection line of a center of the dual-frequency band-pass filter and is arranged at the center of a T-shaped gap line, and the dual-frequency band-pass resonator is of a folded and embedded structure. By adding a transmission zero point mode, the frequency selectivity is improved, the space utilization rate and the integration are effectively improved, the design complexity is reduced, and the differential dual-frequency band-pass filter has the advantages of small introduction noise, high interference-resistant capability and small loss and is widely applied to a mobile wireless communication system.

Description

technical field [0001] The invention belongs to the field of microwave and radio frequency technology, and further relates to a differential dual-frequency bandpass filter in the field of microwave and radio frequency, in particular to a differential dual-frequency bandpass filter with high selectivity, which is applied to the radio frequency front end of a wireless communication system. Background technique [0002] With the rapid development of modern wireless communication systems, filters are more and more widely used in the field of wireless communication, and play an increasingly important role in radio frequency front-ends such as radar systems. A filter with good working characteristics can filter out the noise generated by the system and the interference from other channel signals, and can achieve the performance index of the system design while ensuring the stability of the entire wireless communication system. Nowadays, miniaturization and high performance have be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
Inventor 魏峰程星钰徐乐杨晓宁杨勇毕研强陈卓
Owner XIDIAN UNIV
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