CN104538712B

CN104538712B - LTE high-restrain high-pass filter

Info

Publication number: CN104538712B
Application number: CN201410740764.4A
Authority: CN
Inventors: 彭福
Original assignee: Dfine Technology Co Ltd
Current assignee: Dfine Technology Co Ltd
Priority date: 2014-12-09
Filing date: 2014-12-09
Publication date: 2017-05-17
Anticipated expiration: 2034-12-09
Also published as: CN104538712A

Abstract

The invention relates to an LTE high-restrain high-pass filter. The problem that a high-pass filter cannot meet the requirements for processing signals with higher LTE communication frequency bands and processing multiple signals is solved. A high-pass microstrip line (4) is fixed to a separating plate of a left opening cavity between two standard N-type interfaces, the right side of a coaxial resonant cavity (1) is opened, a resonance rod (2) is arranged in the axial direction of the coaxial resonant cavity (1), the high-pass microstrip line (4) is an S-shaped microstrip transmission line, one ends of a plurality of coaxially-coupled connecting lines (5) are connected to the high-pass microstrip line, and the other ends of the coaxially-coupled connecting lines (5) are connected to the coaxial resonance rod (2). The high-pass microstrip line (4) is fixed to the wall of the coaxial resonant cavity (1) through a coupling medium, and a right opening of the coaxial resonant cavity (1) and a right opening cavity of an axial cavity are sealed by a cover plate (9) through fixing screws (10).

Description

LTE is high to suppress high pass filter

Technical field：

The present invention is relevant with coaxial band-pass filter and high pass filter.

Background technology：

LTE is high to suppress high pass cavity body filter to be part crucial in newest European 4G radio communications LTE system, for solving Certainly Europe 4G communication frequency LTE（728 MHZ -744MHZ）Interference when working with radiovision frequency range 747MHZ simultaneously, so as to Make 4G frequencies LTE mutually unaffected with wireless television signal.Its technical scheme is coaxial band-pass filter or high-pass filtering Device.Coaxial band-pass filter can realize the degree of suppression of near-end by way of elliptic function, but pass band width can not meet 3 Overtones band bandwidth.So the band connection frequency from 700MHZ-2300MHZ can not be realized.Coaxial high pass filter can realize 3 frequencys multiplication Rate pass band width, but deviation band edge frequency 3MHZ part can not be met and suppressed more than 30DB.In the market without phase Close the high suppression high pass filter of communication.LTE is high to suppress high pass bandwidth of cavity filter to require width.Suppress frequency requirement near.The sixth of the twelve Earthly Branches has Wave filter small product size is big, and pass band width is narrow, near-end suppresses low, frequency response characteristic low.LTE communication frequency range can not be met completely The requirement of higher signal processing and multi signal processing system.

The content of the invention：

It is an object of the invention to provide one kind suppresses frequency near with radiovision frequency range with wide, LTE communication frequency can be met The LTE of the higher signal processing of section and multi signal processing requirement is high to suppress high pass filter.

What the present invention was realized in：

There is the N-type interface 3 of standard at the left and right two ends of axial cavity, have dividing plate to be divided into left and right opening in axial cavity Chamber, is fixed with high pass microstrip line 4 on the dividing plate of the left open cavity between the N-type interface of two standards, the upper and lower side of axial cavity respectively has The equal and symmetrical coaxial resonant cavity 1 of quantity, the right side of coaxial resonant cavity 1 is open, and there are resonant rod 2, the section of resonant rod 2 in its axial direction For ellipse, high pass microstrip line is S-shaped microstrip transmission line, and one end of some lines 5 that are coaxially of coupled connections is connected with high pass microstrip line, The line other end that is coaxially of coupled connections is connected respectively on corresponding coaxial resonant rod 2, is formed near-end resonance and is suppressed unit, by coaxial The elliptic function near-end resonance that Chebyshev's model is developed out suppresses unit, the both sides of high pass microstrip line 4 is distributed on, so as to reduce height Near-end decay is formed while bandpass filter volume, high pass microstrip line is fixed on coaxial resonant cavity wall by couplant 6, prevent with Cavity short circuit, cover plate 9 closes the right side opening port of coaxial resonant cavity 1 and axial cavity right side open cavity by fixing screws 10, coaxially Resonant rod 2 constitutes coaxial resonator with coaxial resonant cavity 1, is consolidated by the tuning screw 11 on cover plate 9 and tuning fixing nut 12 It is fixed.

Beneficial effects of the present invention are as follows：

The present invention adopts N-type interface, is capable of achieving the functional realiey of high-frequency transmission.Adopt coaxial filter Qie Bixue again simultaneously The elliptic function near-end resonator cavity that husband's modelling mode is developed i.e. near-end resonance suppresses the combination of unit and high pass microstrip line, i.e., The elliptic function near-end i.e. near-end of resonator cavity that high pass microstrip line incorporates the differentiation of coaxial filter Chebyshev's model design is humorous Shake in suppression unit, both realized the transfer function of wideband frequency, the requirement of near-end suppression can be met again, while using coaxial resonance The mode of chamber symmetric arrays causes high pass filter volume to reduce and can obtain quality factor high very well, reaches the little suppression of Insertion Loss High requirement.

LTE is high to suppress high pass cavity body filter to be part crucial in newest European 4G radio communications LTE system, for solving Certainly Europe 4G communication frequency LTE（728 MHZ -744MHZ）Interference when working with radiovision frequency range 747MHZ simultaneously, so as to Make 4G frequencies LTE mutually unaffected with wireless television signal.Spaced frequency bandwidth 3M carries out suppression decay -30DB.By Suppress frequency farther out in general high pass filter, volume is big, Insertion Loss is big, the suppression requirement that can not realize near-end, frequency response are special Property is low.And band filter pass band width can not produce fade performance when meeting 747MHZ-2300MHZ to 744.So using this The near-end resonance of utility model suppresses the technical scheme that unit is combined with coaxial resonator, so as to reach corresponding requirement.Due to The frequency selectivity of coaxial resonator, it is stipulated that the signal of frequency can be by device, and the energy quilt beyond constant-frequency signal Reflection, so as to realize the function that frequency is selected.

But because communication frequency is nearer with radiovision communication frequency, see that TV can be interfered with during mobile communication.For The quality and wireless television signal for ensureing communication is accomplished by suppressing it accordingly, is connected with high pass microstrip line some Coaxially be of coupled connections one end of line 5, and the line other end that is coaxially of coupled connections is connected on coaxial resonant rod 2, forms the suppression of near-end resonance Unit processed, the elliptic function near-end resonance developed out by coaxial Chebyshev's model suppresses unit, is distributed on 4 liang of high pass microstrip line Side, formed while high pass filter volume near-end decay so as to reduce, so that two kinds of signals of communication are not received when working simultaneously Interference. improve speech quality and radiovision transmission signal.This utility model is used to solve European 4G communication frequencys LTE（728 MHZ -744MHZ）Interference when working with radiovision frequency range 747MHZ simultaneously, so that 4G frequencies LTE are believed with radiovision It is number mutually unaffected.

Present invention high pass filter realizes the degree of suppression of near-end with reference to the mode of coaxial band-pass filter elliptic function, The characteristics of so as to combine coaxial high pass filter again, band connection frequency can be made to realize 3 frequency multiplication bandwidth.Press down so as to full LTE is high The following technical specification of high-pass filtering processed：

Description of the drawings：

Fig. 1 is the front view of the present invention.

Fig. 2 is the right view of Fig. 1.

Fig. 3 is the left view of Fig. 1.

Fig. 4 is the upward view of Fig. 2.

Fig. 5 is the top view of Fig. 4.

Specific embodiment：

The high N-type interfaces 3 for suppressing high pass cavity body filter by two standards of LTE, a high pass microstrip line unit 4, coaxially Resonator cavity 1, coaxial resonant rod 2, be coaxially of coupled connections line 5, couplant 6, resonant rod fixing screws 7, microstrip line fixing screws 8, high pass filter cover plate 9, cover plate fixing screws 10, frequency tuning screw 11, frequency tuning fixing nut 12 is constituted.Cavity Cross section is spill, has cover plate 9 to close above due to installing high pass microstrip line 4., and the left and right two ends of cavity connect for the N-type of standard Mouth 3, is high pass microstrip line unit 4 between the N-type interface of two standards, and high pass microstrip line unit is S-shaped microstrip transmission line shape Into, ten lines 5 that are coaxially of coupled connections are connected with high pass microstrip line unit microstrip line, fixed by couplant 6, prevent and cavity Short circuit.The line other end that is coaxially of coupled connections is connected respectively on corresponding coaxial resonant rod 2, is formed near-end and is suppressed resonant element, The elliptic function resonance developed out by coaxial Chebyshev's model suppresses unit, is distributed on high pass microstrip line unit both sides, so as to Near-end decay is formed while reducing volume.Coaxial resonant rod 2 constitutes coaxial resonator with coaxial resonant cavity 1, by cover plate 9 Tuning screw 11 and tuning fixing nut 12 fix.This utility model realizes frequency 700- by the way of high pass microstrip line The band connection frequency of 2300MHZ.Because passband skew 3MHZ needs to suppress 30dB. so suppressing using coaxial filter Chebyshev The elliptic function mode that mode is developed is designed, and is decayed for the frequency range of near-end, so as to reach technical target of the product requirement.

Operation principle is to be entered by the N-type interface 3 of two standards, through a high pass microstrip line unit 4, realizes passband Frequency passes through.Simultaneously coaxial resonator is combined into by the line that is coaxially of coupled connections using coaxial resonant cavity 1 and coaxial resonant rod 2 5 are connected to high pass microstrip line unit 4.Fixed using 6 pairs of lines that are of coupled connections of couplant.Resonant rod fixing screws 7, microstrip line is solid Determine screw 8, high pass filter cover plate 9, cover plate fixing screws 10, frequency tuning screw 11, frequency tuning fixing nut 12 is constituted Form near-end and suppress resonant element, form near-end decay.Reach near-end attenuation function.

Claims

1.LTE is high to suppress high pass filter, it is characterised in that there is the N-type interface of standard at the left and right two ends of axial cavity（3）, axially There is dividing plate to be divided into left and right open cavity in chamber, be fixed with the dividing plate of the left open cavity between the N-type interface of two standards High pass microstrip line（4）, respectively there is the equal and symmetrical coaxial resonant cavity of quantity the upper and lower side of axial cavity（1）, coaxial resonant cavity（1）It is right Side opens, and there is resonant rod its axial direction（2）, resonant rod（2）Section for ellipse, high pass microstrip line（4）For S-shaped microstrip transmission line, High pass microstrip line（4）On be connected with some lines that are coaxially of coupled connections（5）One end, the other end of the line that is coaxially of coupled connections connects respectively It is connected to corresponding coaxial resonant rod（2）On, form near-end resonance and suppress unit, the ellipse developed out by coaxial Chebyshev's model Function near-end resonance suppresses unit, is distributed on high pass microstrip line（4）Both sides, form near while high pass filter volume is reduced End decay, high pass microstrip line（4）By couplant（6）Coaxial resonant cavity wall is fixed on, is prevented and cavity short circuit, cover plate（9）It is logical Cross fixing screws（10）Closing coaxial resonant cavity（1）Right side opening port and axial cavity right side open cavity, coaxial resonant rod（2）With it is same Axle resonator cavity（1）Composition coaxial resonator, by cover plate（9）On tuning screw（11）With tuning fixing nut（12）It is fixed.