CN201146247Y - Low intermodulation holders for connection of radio frequency cable - Google Patents
Low intermodulation holders for connection of radio frequency cable Download PDFInfo
- Publication number
- CN201146247Y CN201146247Y CNU200720044044XU CN200720044044U CN201146247Y CN 201146247 Y CN201146247 Y CN 201146247Y CN U200720044044X U CNU200720044044X U CN U200720044044XU CN 200720044044 U CN200720044044 U CN 200720044044U CN 201146247 Y CN201146247 Y CN 201146247Y
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- China
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- permanent seat
- base frame
- radio frequency
- fixed base
- seat body
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Abstract
The utility model discloses a low intermodulation permanent seat used for radio-frequency cable connection, which comprises a permanent seat body fixed on the floor, a hole for a jacket-removed cable to contact and run through the permanent seat body and a protruding fin structure arranged on the contact surface between the permanent seat body and the floor. The permanent seat body is designed to be a cylinder shape, and the four sides of the upper end face and the lower end face of the permanent seat body are respectively provided with a circular protruding fin; at the two ends of the central axis of the permanent seat body, a fixing hole is respectively arranged near to the center as much as possible. Or the permanent seat body can be design to be a square shape, with the upper surface and the lower surface being H-shaped sections; two protruding fins are arranged at the upper and the lower surfaces thereof; more than two fixing holes are arranged in a groove formed by the protruding fins; a cable bore vertically runs through every two fixing holes. The low intermodulation permanent seat increases the pressure but reduces the contact area, which results in more even density of the radio-frequency current in a relatively smaller zone and the loss of the inconsistent current density phenomenon caused by uneven original contact surface resulted from the unit area pressure increase.
Description
Technical field
The utility model relates to the radio frequency earthing device of the passive intermodulation index that is used to improve passive devices such as various antenna of mobile communication base station, phase shifter, filter, the particularly low intermodulation holder of radio frequency coaxial-cable or microwave cavity resonator.
Background technology
Passive intermodulation (Passive Intermodulation) is meant the nonlinear distortion performance of radio-frequency (RF) passive product, and it extensively is present in the middle of the various radio frequency passive devices such as similar antenna of mobile communication base station, radio frequency coaxial-cable, filter, duplexer, coupler, lightning arrester.It is since 1. product manufacture and design defective, 2. contain magnetisable material composition material (as iron, nickel, chromium, stainless steel etc.), 3. the metal of different electricity prices connects, 4. bad welding, 5. connection processing is improper, 6. all multifactor generations such as contact-making surface out-of-flatness and stained, corrosion.Except that the influence of magnetic material, another to intermodulation influence bigger be to connect the contact noise that contact interface causes, its mechanism of production is: under uniform electric field, because the pressure of two contact-making surfaces is inhomogeneous, jagged or the out-of-flatness in surface, stained etc., its contact-making surface can produce the even phenomenon of the current unevenness that passes through and (see Fig. 2 a under microcosmic, Fig. 2 b, Fig. 2 c) and corona discharge (Corona) phenomenon, make the contact-making surface part present the nonlinear characteristic that does not meet Ohm's law, this moment is when 2 radio-frequency (RF) energy with upper frequency are passed through, this contact-making surface can produce a large amount of multistage signals relevant with power with these two frequencies, and wherein 3 rank or 7 rank signals can fall into the up reception frequency range of current several mobile communication and form interference.
In the middle of prior art, for above-mentioned several reasons that cause intermodulation to produce, preceding four kinds be can be by product optimal design, strengthen quality of production management supervision and select diamagnetic copper material for use, forbidding nickel, chromium, cobalt, and adopt silver-plated and ternary alloy three-partalloy etc. to obtain suitable control, then then on technology, do not avoid fully as yet or solve for two kinds, particularly on the production and assembly of antenna for base station, flat phase shifter, because cable input end grounding and the improper intermodulation problem that causes of soldering account for more than 50% of passive device intermodulation Issue Totals.Duplexer, filter etc. connect the problem that also always has Intermodulation Interference in the transmission owing to similar reason in the radiofrequency signal feedback in addition.
Its structure of holder that is used for radio frequency cable at present is shown in Fig. 1 a, Fig. 1 b: the U type folder 1-1 (or the pane 1-2 among Fig. 1 b) of Fig. 1 a is fixed on floor 3, goes jacketed cable 2 to pass U type folder 1-1 (or pane 1-2).This structure is because improper, contact-making surface out-of-flatness of connection processing and stained, corrosion etc. are all multifactorly can produce stronger passive intermodulation and disturb.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiency of above-mentioned background technology, to propose a kind of low intermodulation holder that radio frequency cable connects that is used for, being difficult for producing passive intermodulation and interference phenomenon when this holder can make radio frequency coaxial-cable or resonator ground connection.
The technical solution adopted in the utility model is: comprise the fixed base frame that is fixed on the floor, go jacketed cable contact to pass hole on the fixed base frame, on fixed base frame, with the contact surface place on floor prominent fin structure is set.
The structure of fixed base frame is set to cylindrical fixed base frame, and the prominent fin of a circle is respectively arranged around the lower surface thereon, and the axle two ends respectively have one as far as possible to the close fixing hole in center therein, and the cable perforation is 90 degree with fixing hole.
The structure of fixed base frame is set to the square mounting body, and its upper and lower surface is " H " tee section, and the two sides fin of dash forward is arranged in both sides up and down, in the formed groove of prominent fin plural fixing hole is set, and cable is bored a hole and vertically passed between per two fixing holes.
The utility model adopts the contact-making surface of prominent fin structure, increase pressure and reduce contact area, cause radio-frequency current density in a less relatively zone more even, compressive load per unit area increases makes original contact surface out-of-flatness cause the inconsistent phenomenon of current density to disappear.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
Fig. 1 a is the background technology scheme of installation.Among the figure: 1-1.U type folder; 2. remove jacketed cable; 3. floor.
Fig. 1 b is the background technology scheme of installation.Among the figure: the 1-2. pane; 2. remove jacketed cable; 3. floor.
Fig. 2 a is the actual state schematic diagram of two metallic plate contacts; Among the figure: 5. (current density is even), 6. loose contact place (current density is inhomogeneous) are well located in contact.
Fig. 2 b is the partial enlarged drawing at two metallic plate good places of contact 5 (current density is even).
Fig. 2 c is the partial enlarged drawing of two metallic plate loose contact benefits 6 (current density is inhomogeneous).
Fig. 3 is the scheme of installation of cylindrical fixed base frame 7.
Fig. 4 is the scheme of installation of square mounting body 8.
Fig. 5 a is the shape assumption diagram of cylindrical fixed base frame 7 among Fig. 3.
Cut open figure among Fig. 5 b Fig. 5 a.
Fig. 6 a is the shape assumption diagram of square mounting body 8 among Fig. 4.
Fig. 6 b is the cutaway view of Fig. 6 a on the A-A direction.
Embodiment
It shown in Fig. 3, Fig. 5 a, 5b a kind of mounting structure that can be used in the low intermodulation coaxial cable holder of mobile base station antenna input cableport or phase shifter port, fixed base frame 4 is fixed on the floor 3, the fixed base frame 7 of fixed base frame 4 cylindrical structures, the prominent fin 9-1 that a circle is respectively arranged around the upper and lower end face, shaft position respectively has a fixing hole 11-1 in the cylindrical two sides, the cross section vertical with fixing hole 11-1 has cable perforation 10-1, goes jacketed cable 2 contacts to pass cable perforation 10-1 on the fixed base frame 7.Fixing hole 11-1 and prominent fin 9-1 see on same, and height and the width of prominent fin 9-1 respectively are 0.5～2mm.Fixed base frame 7 can silver-plated or ternary alloy three-partalloy.On the structure of Fig. 3, floor 3 is not limited to single face when mounted and installs, and also can two-sidedly install, and just the prominent fin 9-1 of upper and lower side contacts respectively and is installed on the two-sided up and down floor 3.
Shown in Fig. 4, Fig. 6 a, 6b, it is a kind of mounting structure that can be used in the low intermodulation coaxial cable holder of mobile base station antenna input cableport or phase shifter port, fixed base frame 4 is fixed on the floor 3, fixed base frame 4 is according to the restriction of installing space or require design to be the fixed base frame 8 of " H " tee section, upper and lower faces respectively is processed into the prominent fin 9-2 of the high 0.5～2mm in 2 roads, fixing hole 11-2 is vertical mutually with cable perforation 10-2, and close to the center as far as possible, and the ground connection effect can be better like this.Fixing hole 11-2 and prominent fin 9-2 see on same.Fixing hole 11-2 can be provided with more than two, and cable perforation this moment 10-2 just is provided with corresponding number and vertically passes between per two fixing holes.Fixed base frame 8 can silver-plated or ternary alloy three-partalloy.On the structure of Fig. 4, floor 3 is not limited to single face when mounted and installs, and also can two-sidedly install, and just the prominent fin 9-2 of upper and lower side contacts respectively and is installed on the two-sided up and down floor 3.
When the cable fixed base frame 7,8 shown in Fig. 3,4 was fixed on the single or double floor 3, fixed base frame 7,8 each face were by 2 prominent fins and floor 3 joins rather than the plane of whole holder.The advantage of this design is, it makes the contact area on fixed base frame 7,8 and floor than originally greatly reducing, but pressure increases manyfold (pressure is directly proportional with the ratio that reduces area), new compressive load per unit area:
F '=F/A ', A '=A-S (A is the gross area of holder, and S is the region area that reduces),
For example, make S=2/3 * A, A=1, then A '=1/3
Be new compressive load per unit area: F '=3F.
Radio frequency cable is welded on cable perforation 10-1, the 10-2, prominent fin by the holder two sides is connected with floor 3 then, this connection is equivalent to reduce contact area, and makes compressive load per unit area increase, thereby can improve the intermodulation performance performance of radio frequency cable ground connection.Experimental results show that, this scheme can solve passive intermodulation that the input cableport ground connection of most of passive RF internal system cable grounding and antenna of mobile communication base station the causes problem that exceeds standard, in the base station antenna system of 900M/1800M frequency range, adopt the input cable intermodulation level of this earthing mode to be lower than-117～-120dBm (this index for criterion of acceptability for the base station antenna system of-107dBm be have more more than needed).
Cable fixed base frame 7 of the present utility model, 8 can process and electroplate with crowded drawing-die tool drawing aluminium matter or copper shapes, borrow and reduce contact area and increase the uniformity that unit pressure is improved the current density of contact-making surface part, thereby reduced the generation level of intermodulation, this conclusion can be generalized in other application of passive RF system, for example, resonance post ground connection form for traditional cavity body filter, the prominent fin-shaped formula in the outer ring that can to make the face of cylinder of its ground connection into a thickness be 0.5～1mm, passive intermodulation index after handling like this has the above improvement of 3～6dB, and overall performance is more stable.Experimental results show that, this notion can also be generalized in the middle of the radio frequency connector of all size, for example with the N Connector ring flange near do around insulator or the center conductor plane width be 1～2mm, highly be the prominent fin of circle (prominent edge) of 0.1～0.3mm after, not only its intermodulation performance is stable and improve, and it has improvement about 0.05～0.2dB in the insertion loss of the high section part of whole transmission frequency.
Following table is the actual measurement table of comparisons (measuring under both profiles, size, structure, the essentially identical situation of installation method) of the utility model and background technology planar shaped holder:
Claims (7)
1. one kind is used for the low intermodulation holder that radio frequency cable connects, comprise the fixed base frame (4) that is fixed on the floor (3), go jacketed cable (2) contact to pass hole on the fixed base frame, it is characterized in that: go up at fixed base frame (4), prominent fin structure be set with the contact surface place on floor (3).
2. the low intermodulation holder that is used for the radio frequency cable connection according to claim 1 is characterized in that; The structure of fixed base frame (4) is set to cylindrical fixed base frame (7), the circle fin (9-1) of dashing forward is respectively arranged around the lower surface thereon, the axle two ends respectively have one as far as possible to the close fixing hole in center (11-1) therein, and cable perforation (10-1) is 90 degree with fixing hole (11-1).
3. the low intermodulation holder that is used for the radio frequency cable connection according to claim 1 is characterized in that; The structure of fixed base frame (4) is set to rectangle fixed base frame (8), its upper and lower surface is " H " tee section, the two sides fin (9-2) of dashing forward is arranged in both sides up and down, in the formed groove of prominent fin (9-2) plural fixing hole (11-2) is set, cable perforation (10-2) is vertically passed between per two fixing holes.
4. the low intermodulation holder that is used for the radio frequency cable connection according to claim 2 is characterized in that: fixing hole (11-1) sees on same with prominent fin (9-1).
5. the low intermodulation holder that is used for the radio frequency cable connection according to claim 3 is characterized in that: fixing hole (11-2) sees on same with prominent fin (9-2).
6. according to the arbitrary described low intermodulation holder that radio frequency cable connects that is used for of claim 1～5, it is characterized in that: the height and the width of prominent fin (9-1,9-2) respectively are 0.5～2mm.
7. according to the arbitrary described low intermodulation holder that radio frequency cable connects that is used for of claim 1～5, it is characterized in that: floor (3) are fixed with fixed base frame (7,8) single face or are two-sided fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720044044XU CN201146247Y (en) | 2007-10-23 | 2007-10-23 | Low intermodulation holders for connection of radio frequency cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720044044XU CN201146247Y (en) | 2007-10-23 | 2007-10-23 | Low intermodulation holders for connection of radio frequency cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201146247Y true CN201146247Y (en) | 2008-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720044044XU Expired - Fee Related CN201146247Y (en) | 2007-10-23 | 2007-10-23 | Low intermodulation holders for connection of radio frequency cable |
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| CN (1) | CN201146247Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881963A (en) * | 2012-09-25 | 2013-01-16 | 华为技术有限公司 | Phase shifter and antenna |
| CN103414010A (en) * | 2013-08-05 | 2013-11-27 | 珠海德百祺科技有限公司 | Antenna |
| CN106129622A (en) * | 2016-08-17 | 2016-11-16 | 苏州市吴通天线有限公司 | A kind of coaxial cable ground connection and fixing flange |
| WO2017092382A1 (en) * | 2015-11-30 | 2017-06-08 | 华为技术有限公司 | Interconnect structure |
| WO2019011136A1 (en) * | 2017-07-13 | 2019-01-17 | 广州杰赛科技股份有限公司 | Cable outer conductor weldment and antenna |
-
2007
- 2007-10-23 CN CNU200720044044XU patent/CN201146247Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881963A (en) * | 2012-09-25 | 2013-01-16 | 华为技术有限公司 | Phase shifter and antenna |
| CN105098298A (en) * | 2012-09-25 | 2015-11-25 | 华为技术有限公司 | Phase shifter and antenna |
| CN105098298B (en) * | 2012-09-25 | 2018-12-14 | 华为技术有限公司 | A kind of phase shifter, antenna |
| CN103414010A (en) * | 2013-08-05 | 2013-11-27 | 珠海德百祺科技有限公司 | Antenna |
| WO2017092382A1 (en) * | 2015-11-30 | 2017-06-08 | 华为技术有限公司 | Interconnect structure |
| CN106129622A (en) * | 2016-08-17 | 2016-11-16 | 苏州市吴通天线有限公司 | A kind of coaxial cable ground connection and fixing flange |
| WO2019011136A1 (en) * | 2017-07-13 | 2019-01-17 | 广州杰赛科技股份有限公司 | Cable outer conductor weldment and antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081105 Termination date: 20091123 |