CN102610878A - Coaxial low-pass filter - Google Patents
Coaxial low-pass filter Download PDFInfo
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- CN102610878A CN102610878A CN2011102935999A CN201110293599A CN102610878A CN 102610878 A CN102610878 A CN 102610878A CN 2011102935999 A CN2011102935999 A CN 2011102935999A CN 201110293599 A CN201110293599 A CN 201110293599A CN 102610878 A CN102610878 A CN 102610878A
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Abstract
The invention discloses a coaxial low-pass filter capable of suppressing high-order harmonics, belonging to radar and microwave communication techniques. The coaxial low-pass filter comprises a sleeve, a high-order harmonic suppression cylinder, transmission lines and input and output joints, wherein the high-order harmonic suppression cylinders are arranged at the two ends of a sleeve and comprise high-order harmonic suppression cavities and joint matching cavities, and the transmission lines are arranged in the sleeve and the high-order harmonic suppression cylinders and comprise high-impedance sections, low impedance sections, high-order harmonic impedance matching sections, high-order harmonic suppression sections and joint matching sections. One high-order harmonic impedance matching section and one joint matching section are respectively additionally arranged at the two ends of an organic transmission line, and the high-order resonance suppression cylinders are respectively additionally arranged between the sleeve and the input and output joints and match the harmonic suppression sections and the joint matching cavities in the transmission line. Therefore, according to the coaxial low-pass filter capable of suppressing the high-order harmonics, the octave bandwidth can reach 6.5 times, the high-order harmonic suppression degree can be more than 75dB; in addition, the coaxial low-pass filter has the characteristics of high strength, large power capability, stable performance, long service life, low machining difficulty, high product yield and the like.
Description
Technical field
The invention belongs to a kind of low pass filter in radar, the microwave communication technology, particularly a kind of low pass filter that under the high-power operation condition, can suppress high order harmonic component.
Background technology
Filter is one of indispensable device in the wireless communication system, and the index request to filter in short supply of wireless communication system frequency resource is increasingly high.Because frequency spectrum is more and more intensive, interference each other is also more and more obvious, for fear of this interference, then need have the filter of the high suppression characteristic of ultra broadband.Traditional on-axis low pass filter construction comprises sleeve, be located at the transmission line with high and low impedance section (inner wire) in the sleeve and be connected through aciculiform connector/hole with the transmission line two ends respectively input, out splice going splice.Document is called " Precise Design of Coaxial Low-Pass Filters (precise design of on-axis low pass filter) " (" IEEE Transactions Microwave Theory and Techniques "; Vol.MTT-16; Pp.142-147, March 1968) disclosed technology promptly belongs to this type of on-axis low pass filter; But not enough below this low pass filter exists: one of which only is applicable to that frequency is used, its octave bandwidth only about 2.3 when 3.0GHz is following; Its two, this on-axis low pass filter do not have the anti-matching section of handicapping between height impedance transmission lines and joint, it is very big to cause inserting loss, and first section diameter of transmission line (high low-impedance line) must be identical with the joint diameter, otherwise will influence the performance of filter.And notification number be CN201039100Y, denomination of invention for " coaxial high-power low pass filter-impedance transformer " though patent documentation in disclosed on-axis low pass filter between transmission line two ends and input, out splice going splice, set up the impedance matching section; But this on-axis low pass filter also can only be operated in FM broadcast band (88-108MHz), octave bandwidth only about 2.4; And adopt between its high low-impedance line be threaded, its concentricity is poor; Bigger to performance impact, the assembly difficulty of device is big, rate of finished products is lower.Therefore; Above-mentioned on-axis low pass filter exists octave bandwidth all to be lower than 2.5 (only 2.3-2.4) and when being in 3.5GHz, higher frequency band when work more than the 108MHz respectively; Because the influence of high order harmonic component, its performance can sharply descend, even loses defective such as filter function.
Because when the high band of on-axis low pass filter more than 8GHz used, high order harmonic component can influence very big to the band outside inhibitory.For example; Adopting the passband of above-mentioned conventional method design is the on-axis low pass filter of DC～12.4GHz; In the time of in being operated in 17～23GHz scope; Its higher harmonic restraining system is merely (Fig. 3 is the inhibition effect curve figure of this low pass filter to high order harmonic component) about 55dB, with the higher harmonic restraining system should＞75dB require gap bigger; Improve its inhibition degree to high order harmonic component, traditional method is to realize through the diameter that reduces transmission line in the on-axis low pass filter; And the transmission line in traditional on-axis low pass filter generally adopts copper or aluminium alloy to make; When the diameter of transmission line, when particularly wherein high (characteristic) impedance span line is meticulous, not only its difficulty of processing is big but also can reduce the power capacity of filter significantly; In addition since its material rigidity poor, also will reduce the intensity of device, the stability and the useful life of performance.
Summary of the invention
The objective of the invention is the defective that exists to background technology, improve a kind of on-axis low pass filter of design, with effective inhibition high order harmonic component to ultra broadband low pass filter Effect on Performance; Reach on the transmission line of guaranteeing high and low impedance section has the basis of sufficient intensity, realize the stability and the useful life of the octave bandwidth of 6.5 times in on-axis low pass filter, the intensity that improves device, power capacity, performance, and reduce device difficulty of processing, improve the purposes such as rate of finished products of product.
Solution of the present invention is that band is high in keeping traditional on-axis low pass wave filter; On the basis of the transmission line of Low ESR section and impedance matching section (inner wire); Set up a high harmonic inhibition section and a joint matching section respectively at these transmission line two ends; While is at the sleeve (outer conductor) and input of traditional on-axis low pass wave filter; Set up the high harmonic inhibition tube in a band high harmonic inhibition chamber and joint coupling chamber between the out splice going splice respectively, each high harmonic inhibition tube suppresses section with the harmonic wave that the transmission line two ends are set up and the joint matching section cooperates; When work, suppress the higher hamonic wave in signal input and the output; Thereby overcome background technology by reducing the diameter of high and low impedance section in the transmission line; Reduce performances such as its intensity, sacrifice power capacity and suppress the existing drawback of its higher hamonic wave; The present invention is provided with high and low impedance section at the middle part of transmission line; To be located at simultaneously high and low impedance section two ends former with input, out splice going splice impedance for matching matching section, change into the higher hamonic wave impedance matching section of newly-increased high harmonic inhibition section coupling, to reduce the influence that echo causes the transmission signal; The present invention promptly realizes its goal of the invention with this.Therefore; On-axis low pass filter of the present invention comprises sleeve; Be located at impedance matching section that sleeve includes high and low impedance section and be positioned at high and low impedance section two ends transmission line; And input, out splice going splice, key is to have set up a high harmonic inhibition section and a joint matching section respectively successively at the front end of two impedance matching sections of transmission line, two impedance matching sections are then corresponding to high order harmonic component impedance matching section; Between sleeve and input, out splice going splice, then set up the high harmonic inhibition tube in a band high harmonic inhibition chamber and joint coupling chamber respectively; The two ends of sleeve through screw thread be fastenedly connected with two high harmonic inhibition tubes respectively, the other end of two high harmonic inhibition tubes then is fastenedly connected with input, out splice going splice respectively; In the transmission line: high and low impedance section and high order harmonic component impedance matching section still are located in the sleeve, and the high harmonic inhibition section then is located at the interior corresponding high harmonic inhibition chamber of high harmonic inhibition tube respectively with the joint matching section and joint matees in the chamber, also the joint matching section through two ends is connected with input, out splice going splice respectively.
Above-mentionedly be with high and low impedance section, the transmission line of high order harmonic component impedance matching section, high harmonic inhibition section and joint matching section, its transmission line are the aluminium alloy transmission line of electroplate or the stainless steel transmission line of electroplate.Said high harmonic inhibition tube and sleeve are aluminium alloy cylindrical body.
The present invention is owing to the transmission line two ends with high and low impedance section and impedance matching section in traditional on-axis low pass filter have increased a high harmonic inhibition section and a joint matching section respectively; Simultaneously between the sleeve of traditional on-axis low pass filter and input, out splice going splice, set up a band high harmonic inhibition chamber respectively and joint matees the high harmonic inhibition tube in chamber; The harmonic wave of setting up with the transmission line two ends suppresses section and the joint matching section cooperates, to suppress the high order harmonic component of signal in importing and exporting when the work; Thereby overcome background technology through reducing the diameter of high and low impedance section in the transmission line, reduced performances such as its intensity, sacrifice power capacity and suppress the existing drawback of its high order harmonic component; The present invention compares octave bandwidth with background technology can bring up to 6.5 (doubly) by 2.5 (doubly) that are lower than of background technology; When identical and passband is DC～12.4GHZ and is operated in 17～22.4GHz scope at high and low impedance segment structure, the present invention can with about the 55dB of higher harmonic restraining system by background technology, bring up to more than the 75dB.Thereby; On-axis low pass filter of the present invention has octave bandwidth can reach 6.5 (doubly); Can reach more than the 75dB the higher harmonic restraining system, and the intensity of device is high, power capacity is big, the stability and the long service life of performance, and the difficulty of processing of device is low, the characteristics such as rate of finished products height of product.
Description of drawings
Fig. 1. be structural representation of the present invention (cutaway view);
Among the figure: 1. sleeve; 2. transmission line, 2-1. Low ESR section, 2-2. high impedance section, 2-3. high order harmonic component impedance matching section, 2-4. high harmonic inhibition section, 2-5. joint matching section, 2-6. aciculiform connector; 3. high harmonic inhibition tube, 3-1. high harmonic inhibition chamber, 3-2. joint mate chamber, 4. I/O joint;
Fig. 2. be harmonic suppression effect curve chart in the embodiment of the present invention simulation run,
Fig. 3. passband is that the traditional structure low pass filter simulation run time-harmonic wave of DC～12.4GHZ suppresses effect curve figure;
In accompanying drawing 2,3: solid line is signal (main mould) transmission curve, the transmission curve of the transmission curve of the high order harmonic component (higher mode) 1 that rises for the signal principal-mode excitation with leg-of-mutton dotted line, the high order harmonic component (higher mode) 2 that dotted line rises for the signal principal-mode excitation;
Embodiment
The low pass filter that with the passband is DC～12.4GHz is an example: sleeve 1 axial long 32mm, and inside and outside footpath is respectively Φ 7mm and Φ 10mm, and material is the LY12-CZ aluminium alloy; High harmonic inhibition tube 3 also adopts the LY12-CZ material, axially the long 18.75mm of being, external diameter are Φ 16mm; The length of high harmonic inhibition chamber 3-1 in it and diameter are respectively length and the diameter that 5mm and Φ 3.2mm, joint mate chamber 3-2 and are respectively 7.75mm and Φ 5mm, and two high harmonic inhibition tubes 3 then are fastenedly connected with I/O joint 4 respectively through the link into an integrated entity other end of each high harmonic inhibition tube of screw threads for fastening with the two ends of sleeve 1 respectively; This execution mode transmission line 2 adopts stainless steel making, electroplate; Transmission line is established 7 Low ESR section 2-1 and 8 high impedance section 2-2 altogether; The aciculiform connector 2-6 that sets up high order harmonic component impedance matching section 2-3, high harmonic inhibition section 2-4, joint matching section 2-5 at low, high impedance section two ends respectively successively and be used for being connected with the I/O joint; Wherein: low, high impedance section 2-1 and 2-2 are the Center Gap setting with (the 4th) Low ESR section of centre; The diameter of each Low ESR section 2-1 is that Φ 4.3mm, middle (the 4th) Low ESR section are axially long to be 1.17mm, with its be about symmetry (forward and backward) respectively the axial length of three Low ESR sections be followed successively by 1.16mm, 1.10mm and 0.80mm; Each high impedance section 2-2 diameter is Φ 1.0mm; Also with (the 4th) Low ESR section of centre be symmetry, about the length of (forward and backward) each four high impedance section be followed successively by 2.36mm, 2.33mm, 2.23mm and 1.45mm; Length and the diameter of two high order harmonic component impedance matching section 2-3 are respectively 3mm and Φ 3.04mm; The length of two high harmonic inhibition section 2-4 and diameter are respectively 6.5mm and Φ 1.4mm; The length of two joint matching section 2-5 and diameter are respectively 7mm and Φ 2.17mm, and this execution mode transmission line 2 two ends still adopt traditional aciculiform connector (2-6) to be connected with I/O joint 4; Whole transmission line 2 still is located on the axial line of sleeve 1 and high harmonic inhibition tube 3.
This execution mode is through simulation run, in 0.1～17GHz scope to the inhibition degree of high order harmonic component 1 greater than 90dB, to the inhibition degree of high order harmonic component 2 greater than 80dB; In 17～23GHz scope to the inhibition degree of high order harmonic component 1,2 all greater than 95dB; In 23～40GHz scope to the inhibition degree of high order harmonic component 1,2 all greater than 75dB, and have 6.5 times octave bandwidth, power capacity＞35KW; Therefore the performance that can guarantee the on-axis low pass filter satisfies the requirement of using.Accompanying drawing 2 is the high harmonic inhibition effect curve figure in the simulation run of this execution mode.
When Fig. 3 is the on-axis low pass filter simulation run of DC～12.4GHz for adopting passband that traditional structure designed to the inhibition effect curve figure of high order harmonic component; In 0.1～17GHz scope to the inhibition degree of high order harmonic component 1,2 greater than 70dB; But in 17～23GHz scope to the inhibition degree of high order harmonic component 1,2 all about 50dB; In 23～40GHz scope to the inhibition degree of high order harmonic component 1,2 greater than 75dB.Therefore, in 17～23GHz scope, suppress poor ability outside its band, thereby make the on-axis low pass performance of filter not reach the requirement of use high order harmonic component 1,2.
Claims (3)
1. on-axis low pass filter; Comprise sleeve; Be located at impedance matching section that sleeve includes high and low impedance section and be positioned at high and low impedance section two ends transmission line; And input, out splice going splice, it is characterized in that having set up a high harmonic inhibition section and a joint matching section respectively successively, two impedance matching sections are then corresponding to high order harmonic component impedance matching section at the front end of two impedance matching sections of transmission line; Between sleeve and input, out splice going splice, then set up the high harmonic inhibition tube in a band high harmonic inhibition chamber and joint coupling chamber respectively; The two ends of sleeve through screw thread be fastenedly connected with two high harmonic inhibition tubes respectively, the other end of two high harmonic inhibition tubes then is fastenedly connected with input, out splice going splice respectively; In the transmission line: high and low impedance section and high order harmonic component impedance matching section still are located in the sleeve, and the high harmonic inhibition section then is located at the interior corresponding high harmonic inhibition chamber of high harmonic inhibition tube respectively with the joint matching section and joint matees in the chamber, also the joint matching section through two ends is connected with input, out splice going splice respectively.
2. by the said on-axis low pass filter of claim 1; It is characterized in that the said high and low impedance section of being with, the transmission line of high order harmonic component impedance matching section, high harmonic inhibition section and joint matching section is the aluminium alloy transmission line of electroplate or the stainless steel transmission line of electroplate.
3. by the said on-axis low pass filter of claim 1, it is characterized in that said high harmonic inhibition tube and sleeve are aluminium alloy cylindrical body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110293599.9A CN102610878B (en) | 2011-09-30 | 2011-09-30 | Coaxial low-pass filter |
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| CN201110293599.9A CN102610878B (en) | 2011-09-30 | 2011-09-30 | Coaxial low-pass filter |
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| CN102610878A true CN102610878A (en) | 2012-07-25 |
| CN102610878B CN102610878B (en) | 2014-06-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579724A (en) * | 2012-08-10 | 2014-02-12 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN108028451A (en) * | 2015-05-22 | 2018-05-11 | 凯仕林移动通信奥地利有限公司 | High-frequency conductor system with a wire-connected HF leadthrough |
| CN108493542A (en) * | 2018-02-13 | 2018-09-04 | 摩比天线技术（深圳）有限公司 | A kind of coaxial line mode filter improving itself higher hamonic wave |
| CN113972455A (en) * | 2021-11-25 | 2022-01-25 | 南京航空航天大学 | Mechanically tunable low pass filter |
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| JPH0746002A (en) * | 1993-07-27 | 1995-02-14 | Nec Corp | Low-pass filter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579724A (en) * | 2012-08-10 | 2014-02-12 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN103579724B (en) * | 2012-08-10 | 2016-12-21 | 深圳市大富科技股份有限公司 | A kind of cavity body filter and communication radio frequency device |
| CN108028451A (en) * | 2015-05-22 | 2018-05-11 | 凯仕林移动通信奥地利有限公司 | High-frequency conductor system with a wire-connected HF leadthrough |
| US10439263B2 (en) | 2015-05-22 | 2019-10-08 | Kathrein Mobilcom Austria Gmbh | High-frequency conductor system with cable-bound RF bushing |
| CN108028451B (en) * | 2015-05-22 | 2021-03-09 | 凯仕林移动通信奥地利有限公司 | High-frequency conductor system with a wire-connected HF leadthrough |
| CN108493542A (en) * | 2018-02-13 | 2018-09-04 | 摩比天线技术（深圳）有限公司 | A kind of coaxial line mode filter improving itself higher hamonic wave |
| CN113972455A (en) * | 2021-11-25 | 2022-01-25 | 南京航空航天大学 | Mechanically tunable low pass filter |
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| CN102610878B (en) | 2014-06-18 |
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