Unlock instant, AI-driven research and patent intelligence for your innovation.

Bandpass filter with double adjustment of center frequency and bandwidth and modulation method

A band-pass filter, center frequency technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the double-tone switching scheme of the switch filter is not suitable for electronic equipment miniaturization, light weight, high reliability, no double-tone technology scheme and other problems, to achieve the effect of simplifying the circuit and control program, simple control and good effect

Pending Publication Date: 2019-08-16
SOUTHWEST INST OF APPLIED MAGNETICS
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Magnetically tuned filters can only f in microwave, millimeter wave and other frequency bands 0 Adjustable, other types do not have a practical double-adjustment technical solution
[0009] (2) The dual-tuning scheme of switching filters is not suitable for the miniaturization, light weight, and high reliability requirements of current electronic equipment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bandpass filter with double adjustment of center frequency and bandwidth and modulation method
  • Bandpass filter with double adjustment of center frequency and bandwidth and modulation method
  • Bandpass filter with double adjustment of center frequency and bandwidth and modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: see figure 1 , figure 1 It is a quadrature round-the-world coupling circuit model for a magnetically tuned filter, including a single crystal ball 2 and a coupling ring 1. Under the premise of satisfying the resonance condition, we use the external magnetic field to control the f of the single crystal ball 2 0 , when changing the external magnetic field, f 0 will follow the change, achieving f 0 Adjustable, in BW 3dB expression, which affects BW 3dB The size of the single crystal ball 2, the size parameters of the coupling ring 1 and the magnetic parameters of the single crystal ball 2, and both of them are substantive components, it is difficult to change the parameters, and the magnetic parameters of the ball will be affected by the temperature factor. Changes within a certain range, but the change is not practical.

Embodiment 2

[0043] Example 2: see figure 2 , it can be seen that the principle scheme is to pile up point-frequency filters, and the number of piles will increase with the increase of the operating frequency range. If the BW within the full-band operating frequency range is further realized 3dB Variable, the number of piles will increase several times. Its size, weight, reliability and other indicators will be seriously affected, so it is difficult for this solution to meet the requirements of miniaturization, light weight and high reliability of current electronic equipment.

Embodiment 3

[0044] Embodiment 3: see Figure 3 to Figure 8 , a band-pass filter with center frequency and bandwidth double-tuned, the band-pass filter includes a signal input terminal 3, a signal output terminal 4, a magnetic circuit and two resonant circuits 8 located in the magnetic circuit, the resonant circuit 8 is formed by coupling multi-stage small ball resonators, and the parameters of the two resonant circuits 8 are the same and symmetrically set. circuit; the matching circuit is used for standing wave matching between two resonant circuits 8;

[0045] The magnetic circuit is a self-shielding structure, including a yoke 5 and a pole 6 vertically arranged in the center. A working air gap 12 is horizontally set on the pole 6, and the working air gap 12 divides the pole 6 into upper and lower poles. There are two parts, and the middle part of one or two end faces opposite to the upper and lower parts has a gap 7 vertically, and the gap 7 divides the end face where it is located int...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a bandpass filter with the double adjustment of center frequency and bandwidth. The band pass filter comprises a signal input end, a signal output end, a magnetic circuit and two resonant circuits located in the magnetic circuit. A matching circuit is set between the two resonant circuits and is a self-shielding structure which comprises a magnetic yoke and a pole vertically disposed in the center, a working air gap is horizontally formed on the pole, the working air gap divides the pole into upper and lower parts, the middle part of one or two facing end surfaces of the upper and lower parts is vertically provided with a notch, and the notch divides an end surface where the notch is located into two half bodies. A main coil is wound around the pole, secondary coilswith the same number of turns and opposite directions are wound on the two half bodies, the main coil is connected to a main current exciter for adjusting the overall frequency of the filter, and thetwo secondary coils are connected in series to form a staggering frequency coil whose two ports are led out of the magnetic circuit to connect a staggering frequency current exciter to adjust the overall bandwidth of the bandpass filter.

Description

technical field [0001] The invention relates to a band-pass filter, in particular to a band-pass filter and a modulation method with double-tuned center frequency and bandwidth. Background technique [0002] The current integrated development trend of integrated electronic equipment in the microwave frequency band requires the front-end preselector to meet the sharing of multiple tasks, that is, the filter unit not only needs to realize the center frequency f 0 Wide range tuning, while bandwidth BW 3dB It must also have a certain range of adjustment capabilities, that is, double-adjustment f 0 and BW 3dB . [0003] In the microwave frequency band, the stacking of components such as switches and point frequency filters in the switched filter bank can achieve double tone, f 0 The wider the coverage, the greater the number of accumulations. If BW is further realized 3dB Variable, the number of component stacks will also increase several times. Its weight, power consumptio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01P1/215H01P11/00
CPCH01P1/215H01P11/007
Inventor 杨陆蓝江河张平川王津丰何志强王大勇
Owner SOUTHWEST INST OF APPLIED MAGNETICS
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com