Independent electrically tunable dual-band bandpass filters

A dual-band bandpass and filter technology, applied to waveguide devices, circuits, electrical components, etc., can solve the problems of less than 5% relative bandwidth and narrow filter working bandwidth, and achieve good isolation between passbands and good selection performance, the effect of large return loss

Inactive Publication Date: 2019-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Jian Hao of Shanghai University proposed a kind of adjustable band-pass filter consisting of a stepped impedance resonator (SIR) and a dual-mode split-ring resonator loaded with double-terminal short-circuit stubs in "Design of a Dual-Band Independently Adjustable Bandpass Filter". tuned filter, the working bandwidth of the first passband of the filter is relatively narrow, less than 5% of the relative bandwidth

Method used

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  • Independent electrically tunable dual-band bandpass filters
  • Independent electrically tunable dual-band bandpass filters
  • Independent electrically tunable dual-band bandpass filters

Examples

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Embodiment

[0028] In this embodiment, the structure of the independent electrically tunable dual-band bandpass filter based on the stub line loaded resonator is as follows figure 1 As shown, the dimensions are as figure 2 shown. The dielectric plate used is Rogers RT / duroid 5880, with a thickness of 0.508 mm, a relative dielectric constant of 2.2, and a loss tangent of 0.0009. The size parameters of each microstrip line of the filter are as follows: W1=0.3mm, W2=0.6mm, S1=0.1mm, S2=0.1mm, S3=0.16mm, L1=28.15mm, L2=22mm, L3=1.5mm, D = 34.5mm. The width of the 50 ohm input and output feeder is 1.54mm, and the area of ​​the microstrip line of the filter is 18.9×26.5mm 2 , the corresponding guide wavelength size is 0.168λ g ×0.235λ g , where λ g is the waveguide wavelength corresponding to the central frequency of the first passband. The length and width of the above microstrip lines are selected to obtain optimal in-band transmission characteristics, out-of-band attenuation characte...

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Abstract

The invention discloses an adjustable dual-frequency band-pass filter with independent power. The filter comprises a dielectric plate, an earth plate, a first quarter-wave resonator, a second quarter-wave resonator, short-circuit stub-loaded resonators, an input feeder line, an output feeder line and an external circuit, wherein the first quarter-wave resonator, the second quarter-wave resonator, the short-circuit stub-loaded resonators, the input feeder line, the output feeder line and the external circuit are all arranged on the upper surface of a dielectric substrate; the earth plate is arranged on the lower surface of the dielectric substrate; the short-circuit stub-loaded resonators are symmetrical left and right around the central shaft of the filter; the first quarter-wave resonator and the second quarter-wave resonator are symmetrical left and right around the central shaft of the filter; and the input feeder line and the output feeder line are symmetrical left and right around the central shaft of the filter. The adjustable dual-frequency band-pass filter has the advantages of light weight, small volume, high reliability, excellent performance, high temperature stability, low production cost and the like, and can be applicable to multi-band multi-service modern wireless communication systems under different working environments.

Description

technical field [0001] The invention relates to the technology of an electrically adjustable band-pass filter, in particular to an independent electrically adjustable dual-frequency band-pass filter. Background technique [0002] In recent years, with the development of mobile communications, spectrum resources have become more and more scarce. In order to increase the number of channels, it is often required to expand new frequency bands. Compatible dual / multi-band communication has become a development trend. In this way, different wireless modules often need to be integrated into the same mobile terminal, so that the terminal can work on multiple different frequencies at the same time, which will inevitably reduce space utilization. [0003] Compared with the multi-frequency filter with fixed bandwidth, the tunable filter, which is more convenient to adjust the frequency band, is an important type of filter, and has been widely used in civilian and military communication ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 刘泽南杨国吴文陈春红
Owner NANJING UNIV OF SCI & TECH
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