WO2012106944A1 - Filtre - Google Patents

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Publication number
WO2012106944A1
WO2012106944A1 PCT/CN2011/078443 CN2011078443W WO2012106944A1 WO 2012106944 A1 WO2012106944 A1 WO 2012106944A1 CN 2011078443 W CN2011078443 W CN 2011078443W WO 2012106944 A1 WO2012106944 A1 WO 2012106944A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
input
filter circuit
circuit
coupling device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/078443
Other languages
English (en)
Chinese (zh)
Inventor
王秋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2012106944A1 publication Critical patent/WO2012106944A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/075—Ladder networks, e.g. electric wave filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0123—Frequency selective two-port networks comprising distributed impedance elements together with lumped impedance elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1708—Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/01—Tuned parameter of filter characteristics
    • H03H2210/015—Quality factor or bandwidth
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/02—Variable filter component
    • H03H2210/025—Capacitor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2210/00—Indexing scheme relating to details of tunable filters
    • H03H2210/03—Type of tuning
    • H03H2210/033—Continuous
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters

Definitions

  • the present invention relates to the field of signal processing technologies, and in particular, to a filter. Background technique
  • Signal filtering is a key part of signal processing. Its function is to extract useful signals from many signals and filter out other unwanted signals for use by the back end.
  • a filter is a device for eliminating interference noise, filtering out signals outside the required bandwidth, and effectively filtering out frequencies at a specific frequency or frequencies outside the frequency.
  • the existing signal filtering is to filter and extract signals in a fixed frequency bandwidth range, and the circuit is bloated, and the flexibility is not strong, so that it is easy to cause useless signals to pass together, thereby affecting the use.
  • the technical problem to be solved by the present invention is to provide a filter for solving the problem that the output signal of the existing filter contains more unnecessary signals.
  • a filter of the present invention includes: a filter circuit, a tunable coupling device, and an input filter device, wherein the tunable coupling device is connected across two connection ends of the filter circuit, and the input filter device is One end is electrically connected to one end of the adjustable coupling device, and the other end is a control voltage input terminal.
  • the filter circuit comprises an N ( N > 1 ) fractional filter circuit, the signal input ends of the N-stage filter circuit are connected to each other, the signal output terminal is grounded, and the adjustable coupling device is connected across one or any two partial filters. On the signal input of the circuit.
  • the tunable coupling device is a device that changes the coupling coefficient between the terminals.
  • the plurality of tunable coupling devices are respectively connected across the signal input ends of one or any two of the partial filters.
  • the input filter element is an inductive element for isolating the input signal.
  • the filter further comprises a first DC blocking capacitor and a second DC blocking capacitor, the first DC blocking capacitor is serially connected to the input end of the filter circuit, and the second DC blocking capacitor is serially connected to the output end of the filter circuit.
  • between the first DC blocking capacitor and the input end of the filter circuit, between the second DC blocking capacitor and the output end of the filter circuit, and the signal input end of the ⁇ Fractional filter circuit are inverted by 90 degrees. Microstrip line connection.
  • the partial filter circuit is a parallel band pass filter.
  • a filter includes: a filter circuit, a tunable coupling device, an input filter device, and a control voltage adjustment circuit, wherein the tunable coupling device is connected across the two connection ends of the filter circuit, and one end of the input filter device is adjustable One end of the coupling device is electrically connected, and the other end is a control voltage input terminal, and the control voltage regulating circuit is electrically connected to the control voltage input terminal.
  • the filter circuit comprises a ⁇ ( ⁇ > 1 ) fractional filter circuit, wherein the signal input ends of the ⁇ -stage filter circuit are connected to each other, the signal output terminal is grounded, and the tunable coupling device is connected across any two-stage filter circuit. On the signal input.
  • the filter of the present embodiment increases the insertion loss of the filter, reduces the noise figure, has a wider frequency selection range, is more flexible, and has stronger pin-inness by adding a tunable coupling device.
  • FIG. 1 is a schematic structural view of a filter of the embodiment
  • FIG. 2 is a schematic diagram of the frequency response of a conventional Chebyshev filter
  • Fig. 3 is a schematic diagram showing the frequency response of the filter of the present embodiment.
  • the adjustable coupling device in the elliptical filter of the present embodiment is connected to the two connection ends of the filter circuit, and is a device for changing the coupling coefficient between the connection terminals, and one end of the input filter device and one end of the adjustable coupling device Electrically connected, the other end is the control voltage input terminal, which can be connected to the control voltage regulation circuit to adjust the voltage applied to the input filter device.
  • the filter circuit comprises an N ( N > 1 ) fractional filter circuit, wherein the signal input ends of the N-stage filter circuit are electrically connected to each other, the signal output terminal is grounded, and the adjustable coupling device is connected to the signal of one or any two of the partial filters. On the input.
  • a first DC blocking capacitor Ca and a second DC blocking capacitor Cb are connected in series between the signal input end and the signal output end of the filter circuit, and the first DC blocking capacitor Ca and the second DC blocking capacitor Cb are reversed by 90 degrees.
  • the microstrip line connection of the phase, the N-stage filter circuit is connected between the first DC blocking capacitor Ca and the second DC blocking capacitor Cb, and the sub-filter circuit can use the parallel band pass filter, the parallel band pass filter and the
  • An adjustable coupling device is connected across the connection point of a DC blocking capacitor, and one or more adjustable coupling devices can be connected in the filter.
  • the adjustable coupling device can be a variable capacitor or a variable inductor.
  • 1 is an elliptical filter of the embodiment, wherein one end of the first DC blocking capacitor Ca is an input end of a signal, the other end is connected to one end of the second DC blocking capacitor Cb, and the other end of Cb is a signal output end; N parallel bandpass filters are connected between the straight capacitor Ca and the second DC blocking capacitor Cb. One end of the parallel bandpass filter is connected to the output end of Ca, and the other end is grounded. The inputs of the parallel bandpass filter are connected by a 90 degree inverted microstrip line.
  • the tunable coupling device (variable coupling capacitor VD1) can be connected across the connection point of any two parallel bandpass filters and the output of the first DC blocking capacitor Ca, where the jump between the nodes N1 and N+2 is variable
  • the coupling capacitor VD1 is taken as an example.
  • One end of the VD1 is connected with an input filter device, and the capacitance of the VD1 is adjusted by loading the control voltage Vin1 on the input filter device.
  • the voltage Vinl can be adjusted by a control voltage regulating circuit which can be any way in which the voltage can be adjusted.
  • the first DC blocking capacitor Ca is a DC blocking capacitor at the input end, one end of which is a signal input end, and the other end (the signal output end of Ca) is connected to the first-stage parallel band formed by L1 and C1 through a 90-degree inverted microstrip line. Pass the input of the filter.
  • One end of the first-stage parallel band-pass filter is connected to the signal output end of the first DC blocking capacitor Ca, and the other end is grounded.
  • L2 and C2 are connected in parallel to form a second-stage parallel band-pass filter.
  • One end of the second-stage parallel band-pass filter is connected to the signal output end of Ca, and the other end is grounded.
  • Ln and Cn are connected in parallel to form an Nth-stage parallel band-pass filter.
  • One end of the N-th parallel band-pass filter is connected to the signal output end of Ca, and the other end is grounded.
  • the signal input terminals of the 1st to Nth parallel bandpass filters are connected by a 90 degree inverted microstrip line.
  • the second DC blocking capacitor Cb is a DC blocking capacitor at the output end. One end is connected to the signal input end of the Nth parallel bandpass filter through a 90 degree microstrip line, and the other end is the signal output end of the filter.
  • variable coupling capacitor VD1 of the input end and the output end is connected between the nodes N1 and N+2, and the capacitance of the variable coupling capacitor can be changed by changing the voltage across the variable coupling capacitor by changing Vin1. .
  • Z1 is Vinl's input filter element, which is an inductive component that isolates the input signal being processed.
  • the control voltage regulating circuit provides a control voltage Vinl, which can output the required control voltage according to the voltage value corresponding to the frequency range required by the filter, and can also perform operation analysis according to the feedback condition of the output, and then output the control voltage.
  • the required input reflection coefficient S1 1 i.e., input return loss
  • forward transmission coefficient S21 i.e., gain
  • FIG. 2 is a schematic diagram of the frequency response of the Chebyshev filter
  • FIG. 3 is a schematic diagram of the frequency response of the filter of the present embodiment. It can be seen that the filter of the present embodiment has a transmission zero point and rapid decay. The reduced filter edge is especially suitable for narrowband filtering.
  • the filter of the present embodiment increases the insertion loss of the filter, reduces the noise figure, has a wider frequency selection range, is more flexible, and is more targeted by adding a tunable coupling device.

Landscapes

  • Filters And Equalizers (AREA)

Abstract

L'invention concerne un filtre qui comprend un circuit de filtre, un composant de coupleur accordable, et un composant de filtre d'entrée. Le composant de coupleur accordable est connecté en pont aux deux extrémités de connexion du circuit de filtre. Une extrémité du composant de filtre d'entrée est connectée électriquement à une extrémité du composant de coupleur accordable tandis que l'autre extrémité du composant de filtre d'entrée est une extrémité d'entrée de tension de commande. L'ajout du composant de coupleur accordable au filtre permet à ce dernier de réduire sa perte d'insertion et son coefficient de bruit, d'élargir sa plage de fréquence et d'améliorer sa flexibilité et sa capacité de ciblage.
PCT/CN2011/078443 2011-02-09 2011-08-16 Filtre Ceased WO2012106944A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011200351955U CN202094847U (zh) 2011-02-09 2011-02-09 一种滤波器
CN201120035195.5 2011-02-09

Publications (1)

Publication Number Publication Date
WO2012106944A1 true WO2012106944A1 (fr) 2012-08-16

Family

ID=45369887

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/078443 Ceased WO2012106944A1 (fr) 2011-02-09 2011-08-16 Filtre

Country Status (2)

Country Link
CN (1) CN202094847U (fr)
WO (1) WO2012106944A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103606724B (zh) * 2013-11-25 2016-09-07 海能达通信股份有限公司 一种功率设备及其微带滤波器
WO2023217259A1 (fr) * 2022-05-13 2023-11-16 电子科技大学 Circuit onduleur de tube de puissance côté non haut et module onduleur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090072925A1 (en) * 2007-09-03 2009-03-19 Stmicroelectronics Sa Frequency tuning circuit for lattice filter
CN201490978U (zh) * 2009-09-08 2010-05-26 顺泰电子科技股份有限公司 可调制带通同向双工滤波器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090072925A1 (en) * 2007-09-03 2009-03-19 Stmicroelectronics Sa Frequency tuning circuit for lattice filter
CN201490978U (zh) * 2009-09-08 2010-05-26 顺泰电子科技股份有限公司 可调制带通同向双工滤波器

Also Published As

Publication number Publication date
CN202094847U (zh) 2011-12-28

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