CN2879447Y - Tower top amplifier feeding device adopting coaxial cavity coupling RF signal - Google Patents
Tower top amplifier feeding device adopting coaxial cavity coupling RF signal Download PDFInfo
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- CN2879447Y CN2879447Y CNU2005201452981U CN200520145298U CN2879447Y CN 2879447 Y CN2879447 Y CN 2879447Y CN U2005201452981 U CNU2005201452981 U CN U2005201452981U CN 200520145298 U CN200520145298 U CN 200520145298U CN 2879447 Y CN2879447 Y CN 2879447Y
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- end structure
- coaxial cavity
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- ant
- polytetrafluoroethylene film
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Abstract
The present utility model discloses a tower top amplifier feeding device adopting coaxial cavity coupling RF signal, which is composed of feeding poles (01) and (05), ANT terminal structure (02), polytetrafluoroethylene film (03) and BTS terminal structure (04). The feeding poles are used for leading the direct current voltage to the ANT terminal from the BTS terminal. The ANT terminal structure is used as inner core of a coaxial cavity coupling capacitance, and the BTS terminal structure is as outer core, and the polytetrafluoroethylene film is as medium. The coupling capacitance composed of the ANT terminal structure, the BTS terminal structure and the polytetrafluoroethylene film is used for coupling RF signal. In the machining technology, aluminum alloy material finish machining, surface roughness forecast and control, silver plating process and appearance spraying plastics are adopted. In the whole design, an integrated cavity structure is adopted. The device has the advantages of beautiful appearance, reliable, low cost, strong bearing power, and small temperature coefficient. The device can reduce the system intermodulated production about 20-35dBm at 2X+43dBm, thereby evidently improve the cover range and telephone traffic of the mobile communication base station.
Description
Affiliated technical field
The utility model relates to a kind of loop that is used for the mobile communication system tower amplifier, is specifically related to a kind of coupling capacitance that adopts integrated coaxial cavity to constitute realizes coupling to mobile communication up-downgoing radiofrequency signal tower amplifier loop.
Background technology
In order to improve the mobile communication base station) sensitivity and signal cover, at present a large amount of tower amplifier subsystems that use.This subsystem is to constitute (referring to Fig. 1) by duplex tower top amplifier, loop, lightning arrester, power supply supervision unit etc.Wherein, the effect of loop is with direct current (DC) feed-in cable, arrives tower amplifier again, powers to low noise amplifier.
Traditional tower amplifier loop is made up of a box body, two joints, PCB and resistance capacitances etc., transmit with microstrip line, the middle microwave capacitors stopping direct current of using, its direct voltage is sent to an end of joint through air core inductor, power the other end of its joint direct be connected with lightning arrester (as shown in Figure 2) again to tower amplifier through cable.
Tower amplifier loop insertion loss under the traditional approach is big, and temperature varying coefficient is big, and passive intermodulation signal is than higher, and is bigger to base station interference.With traditional tower amplifier loop of being used for gsm system is example, its passive intermodulation generally up to-80～-100dBm@2X+43dBm, so consequent intermodulation signal will inevitably impact the GSM base station system.
Summary of the invention
In order to solve the existing above-mentioned technical problem of mobile communication tower amplifier loop under the traditional approach, the utility model discloses a kind of tower amplifier loop that adopts metal coaxial cavity coupling radiofrequency signal.
The utility model is by feeder pillar 01, ANT end structure 02, and polytetrafluoroethylene film 03, BTS end structure 04, feeder pillar 05 constitute.Respectively feeder pillar 01 and feeder pillar 05 are screwed into ANT end structure 02 and BTS end structure 04, ANT end structure 02 is inserted into polytetrafluoroethylene film 03, polytetrafluoroethylene film 03 is inserted into BTS end structure 04; By feeder pillar 05 and feeder pillar 01 direct voltage is incorporated into ANT end structure 02 by BTS end structure 04; Constitute the coaxial cavity coupling capacitance jointly by ANT end structure 02, polytetrafluoroethylene film 03 and BTS end structure 04 three, as the inner core and the outer core of this coaxial cavity coupling capacitance, polytetrafluoroethylene film 03 is as the medium of this coaxial cavity coupling capacitance respectively for its ANT end structure 02 and BTS end structure 04; Be coupled by this coaxial cavity coupling capacitance respectively from the downlink radio-frequency signal of BTS end and the up radiofrequency signal of holding from ANT.Above-described direct voltage feed part and up-downgoing mobile communication radio frequency signal coupling unit are designed to integrated metallic cavity structure on the whole.Use as the typical case, described feeder pillar 01 and feeder pillar 05 adopt silver-plated metal bar, and the thickness of described polytetrafluoroethylene film 03 is 0.1mm, and the PCB material is AD255IM30.The processing technology that the utility model adopts aluminum alloy materials fine finishining processing, surface roughness prediction and control, silver-plated processing and outer surface plastic-blasting to handle.In anti-lightning strike part with power up indicating section and adopt ceramic gas discharge tube, Transient Suppression Diode and light-emitting diode respectively.
Basic principle of the present utility model is that by adopting integrated metallic cavity structure, the equivalent capacity of usefulness metal coaxial cavity substitutes traditional microwave stopping direct current and coupling capacitance thereof, and adopts complex processing technology, reduces passive intermodulation (PIM) to greatest extent.
IMD (Intermodulation Distortion) is one of key factor that influences performance in wireless communication systems.It is conventionally believed that IMD only can could produce by the nonlinear device in active circuit, and in fact because there is thermal noise in passive device, also can corresponding increase IMD.We are referred to as PIM to total IMD that active device and passive device produced.Its PIM interference signal will produce very significant effects to wireless communication system, and it will reduce C/I (Carrier-to-Interference) value of whole communication system, thereby reduce the capacity of whole communication system.
It now is example with the gsm mobile communication system.
Because there is thermal noise in electronic device, the noise level that tower amplifier is exported when operate as normal is as follows:
According to
P
TLA-Noise=10log (KTB)+NF
TLA+ G
TLA(dB), in the formula:
P
TLA-Noise---tower is put the line output noise level;
K---Boltzmann constant (1.38 * 10
-23W/Hz/K);
T---noise temperature is generally got 295K (absolute temperature);
B---GSM signal bandwidth is got 0.2MHz;
Then
P
n(thermal noise of gsm system)=10log (KTB=-174+10log
10(0.2 * 10
6The 121dBm of)=-;
NF
TLA---the noise of whole base station system is in 2.8dB (tower put noise factor get 2dB);
G
TLA---tower is put the row gain, gets 12dB;
Count in addition
3dB is got in the loss of Lc---cable;
So,
Overall noise factor=P
TLA-Noise+ Lc=P
n+ NF
TLA+ G
TLA+ LC
＝-121dBm+2.8dB+12dB-3dB≈-109dBm。
In order to satisfy the requirement of system better, we will reserve the surplus of 2dB,
Therefore, has only the P of working as
PIMDuring＜-111dBm,
PIM just can not impact the GSM base station system.So after the tower amplifier subsystem was installed, the interference of base station input port was less than-111dBm, that is, the overall intermodulation signal of duplex tower top amplifier, loop, lightning arrester etc. must just can not influence the GSM base station system less than-111dBm.
And can fully satisfy above-mentioned requirements behind employing the utility model.
Through actual verification, by the tower amplifier loop of employing coaxial cavity provided by the utility model coupling radiofrequency signal, its overall intermodulation PIM value can hang down and reach-115～-120dBm@2X+43dBm, so can not disturb the GSM base station system.
Its main radio frequency parameter is as shown in the table:
| Working frequency range | 800～960MHz |
| Insert loss | ≤0.2dB |
| Return loss | |
| Tower is put port | ＞22dB |
| Base station port | ＞22dB |
| The carrying of RF power | +52dBm |
| RF Hu Tiaodianping @2X+43dBm | ＜-110dBm |
| Lightning strike protection | 8/20 μ s 20kA pulse |
| The direct current power carrying | |
| Voltage: electric current: | 12+1V 2A |
| Radio-frequency joint | |
| Radio-frequency joint TLA-8001P1 (II) | BTS holds 7/16 cloudy ANT to hold 7/16 positive head |
| Radio-frequency joint TLA-8001P (II) | BTS holds 7/16 positive ANT to hold 7/16 cloudy head |
| The direct current joint | 50 Ω SMB sun |
| Environmental characteristics | |
| Working environment | |
| Ambient temperature | -40-+65℃ |
| Relative humidity | 5-95％ |
| The encapsulation protection | IP50 |
| MTBF | ＞500,000 hour |
The utility model is both artistic and practical, reliability is high, (cost reduces about 50 yuan /) with low cost, load power strong (〉=150W), temperature varying coefficient is little, especially can make the overall intermodulation product of system adopt the tower amplifier loop of traditional approach to reduce up to 20～35dBm@2X+43dBm, thereby can obviously improve the coverage and the telephone traffic of base stations in mobile communication system, and reduce the cost of whole system.
Brief Description Of Drawings
Figure 1 shows that the system block diagram of mobile communication system tower amplifier;
Figure 2 shows that system's composition diagram of the tower amplifier loop under the traditional approach;
Figure 3 shows that the cut-away view of tower amplifier loop provided by the utility model;
Figure 4 shows that the formation schematic diagram of tower amplifier loop provided by the utility model.
Figure 5 shows that the electric principle and the radio circuit isoboles thereof of tower amplifier loop provided by the utility model;
Figure 6 shows that according to the formation schematic diagram of tower amplifier loop shown in Figure 4 made HFSS simulation model figure;
Figure 7 shows that the insertion damage curve (S12, S21) figure that are drawn according to tower amplifier loop HFSS simulation model figure shown in Figure 6;
Figure 8 shows that the return loss plot (S22, S11) figure that are drawn according to tower amplifier loop HFSS simulation model figure shown in Figure 6.
Its description of reference numerals is as follows:
01,05: feeder pillar; The 02:ANT end structure; 03: polytetrafluoroethylene film; The 04:BTS end structure.
Embodiment
Specifically describe corresponding to preferred embodiment of the present utility model below in conjunction with accompanying drawing:
1, Figure 1 shows that the system block diagram of mobile communication system tower amplifier.
As shown in the figure, the mobile communication tower amplifier is by formations such as duplex (or single worker) tower amplifier, loop, lightning arrester, power supply supervision units.Wherein, the effect of loop is that direct current (DC) feed-in cable is arrived tower amplifier again, thinks the low noise amplifier power supply.
2, referring to system's composition diagram of the tower amplifier loop under the traditional approach shown in Figure 2.
Tower amplifier loop under the traditional approach is made up of a box body, two joints, PCB and resistance capacitances etc., transmit with microstrip line, the middle microwave capacitors stopping direct current of using, its direct voltage is sent to an end of joint through air core inductor, power to tower amplifier through cable, the other end of its joint directly is connected with lightning arrester again.
Figure 2 shows that wherein duplex tower top amplifier and loop.Faint upward signal from the antenna reception, pass through duplexer, after the balance low noise amplifier amplifies (about 12dB), enter cable by radio-frequency relay K2, coupling capacitance and duplexer again, arrive loop again, finally enter the base station and receive, the downstream signal that comes from the base station, through loop, cable,, directly enter the antenna emission to duplexer.Wherein, the loop of this tower amplifier is made up of microwave capacitors C and air core inductor L.Be fed into the Zhongdao duplex tower top amplifier of cable of transmitting radio frequency signal through loop from the 12V DC power supply voltage of power supply supervision unit, then by the air core inductor L balance low noise amplifier of feeding, downlink radio-frequency signal from base station BTS then is coupled to antenna ANT by microwave capacitors C, then is coupled to base station BTS by microwave capacitors C from the up radiofrequency signal of antenna ANT.
3, referring to the formation schematic diagram of the cut-away view of tower amplifier loop provided by the utility model shown in Figure 3 and tower amplifier loop provided by the utility model shown in Figure 4.
As shown in Figure 3, on the whole, the utility model is made up of DC feed circuit and radio frequency primary path two large divisions.
As shown in Figure 4, the utility model is specifically by feeder pillar 01, ANT end structure 02, and polytetrafluoroethylene film 03, BTS end structure 04, feeder pillar 05 constitute.Respectively feeder pillar 01 and feeder pillar 05 are screwed into ANT end structure 02 and BTS end structure 04, ANT end structure 02 is inserted into polytetrafluoroethylene film 03, polytetrafluoroethylene film 03 is inserted into BTS end structure 04; By feeder pillar 01 direct voltage is incorporated into ANT end structure 02; Constitute the coaxial cavity coupling capacitance jointly by ANT end structure 02, polytetrafluoroethylene film 03 and BTS end structure 04 three, as the inner core and the outer core of this coaxial cavity coupling capacitance, polytetrafluoroethylene film 03 is as the medium of this coaxial cavity coupling capacitance respectively for its ANT end structure 02 and BTS end structure 04; Be coupled by this coaxial cavity coupling capacitance respectively from the downlink radio-frequency signal of BTS end and the up radiofrequency signal of holding from ANT.Above-described direct voltage feed part and up-downgoing mobile communication radio frequency signal coupling unit are designed to integrated metallic cavity structure on the whole.
4, referring to the electric principle and the radio circuit isoboles thereof of tower amplifier loop provided by the utility model shown in Figure 5.
Descending high-power RF signal from base station BTS is input to CZ1 connector (DIN-F or DIN-M), through the C1 coupling (as shown in the figure, its coaxial cavity is an electric capacity by equivalence), from CT1 connector (DIN-M or DIN-F) output, its up radiofrequency signal is by anti-phase transmission simultaneously; The DC power supply voltage of+12V is added to the ANT end by the SMB connector through C2, C3, C4, C5, R2, R3, C6, L3, C7, C8, L2, to give duplex tower top amplifier direct current supply, realizes the radio circuit coupling by L1, L2, C7, C8 simultaneously; Constitute lightning protection circuit by D1, D3, R2, R3, C6, L3, C7, C8, L2, L1, constitute the direct voltage indicating circuit by R1 and D2 luminous tube.
5, Figure 6 shows that according to the formation schematic diagram of tower amplifier loop shown in Figure 4 made HFSS simulation model figure; Figure 7 shows that the insertion damage curve (S12, S21) figure that are drawn according to tower amplifier loop HFSS simulation model figure shown in Figure 6; Figure 8 shows that return loss plot (S22, S11) figure for being drawn according to tower amplifier loop HFSS simulation model figure shown in Figure 6.According to simulation result, as can be seen, the utility model can realize novel tower is put the high performance technology requirement of loop, and, verified that comparing the overall intermodulation product that tower amplifier loop provided by the utility model caused with traditional approach will can not cause interference to the mobile communication base station by actual test.
Claims (4)
1, a kind of tower amplifier loop that adopts coaxial cavity coupling radiofrequency signal, by feeder pillar (01), ANT end structure (02), polytetrafluoroethylene film (03), BTS end structure (04), feeder pillar (05) constitute, and it is characterized in that, feeder pillar (01) and feeder pillar (05) are screwed into ANT end structure (02) and BTS end structure (04) respectively, ANT end structure (02) is inserted into polytetrafluoroethylene film (03), polytetrafluoroethylene film (03) is inserted into BTS end structure (04); By feeder pillar (01) direct voltage is incorporated into ANT end structure (02); Constitute the coaxial cavity coupling capacitance jointly by ANT end structure (02), polytetrafluoroethylene film (03) and BTS end structure (04) three, as the inner core and the outer core of this coaxial cavity coupling capacitance, polytetrafluoroethylene film (03) is as the medium of this coaxial cavity coupling capacitance respectively for its ANT end structure (02) and BTS end structure (04); Be coupled by this coaxial cavity coupling capacitance respectively from the downlink radio-frequency signal of BTS end and the up radiofrequency signal of holding from ANT.
2, the tower amplifier loop of employing coaxial cavity coupling radiofrequency signal according to claim 1, it is characterized in that described direct voltage feed part and up-downgoing mobile communication radio frequency signal coupling unit are designed to integrated metallic cavity structure on the whole.
3, the tower amplifier loop of employing coaxial cavity coupling radiofrequency signal according to claim 1, it is characterized in that, use as the typical case, described feeder pillar (01) and feeder pillar (05) adopt silver-plated metal bar, the thickness of described polytetrafluoroethylene film (03) is got 0.1mm, and the PCB material is ADD255IM30.
4, the tower amplifier loop of employing coaxial cavity according to claim 1 coupling radiofrequency signal is characterized in that, in anti-lightning strike part with power up indicating section and adopt ceramic gas discharge tube, Transient Suppression Diode and light-emitting diode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201452981U CN2879447Y (en) | 2005-12-27 | 2005-12-27 | Tower top amplifier feeding device adopting coaxial cavity coupling RF signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201452981U CN2879447Y (en) | 2005-12-27 | 2005-12-27 | Tower top amplifier feeding device adopting coaxial cavity coupling RF signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2879447Y true CN2879447Y (en) | 2007-03-14 |
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ID=37861866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005201452981U Expired - Fee Related CN2879447Y (en) | 2005-12-27 | 2005-12-27 | Tower top amplifier feeding device adopting coaxial cavity coupling RF signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2879447Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847765A (en) * | 2010-03-17 | 2010-09-29 | 镇江华坚电子有限公司 | Antenna feeder arrester |
| CN101510790B (en) * | 2009-03-26 | 2012-10-24 | 京信通信系统（中国）有限公司 | Wide-band right-angle feeding device |
| CN101330302B (en) * | 2007-06-19 | 2014-06-11 | 京信通信系统（中国）有限公司 | Wideband feeding appliance |
-
2005
- 2005-12-27 CN CNU2005201452981U patent/CN2879447Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330302B (en) * | 2007-06-19 | 2014-06-11 | 京信通信系统（中国）有限公司 | Wideband feeding appliance |
| CN101510790B (en) * | 2009-03-26 | 2012-10-24 | 京信通信系统（中国）有限公司 | Wide-band right-angle feeding device |
| CN101847765A (en) * | 2010-03-17 | 2010-09-29 | 镇江华坚电子有限公司 | Antenna feeder arrester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Nanjing Youqiao Electronic Technology Co., Ltd. Assignor: Jingxin Communication Technology (Guangzhou) Co., Ltd. Contract record no.: 2011320000272 Denomination of utility model: Tower top amplifier feeding device adopting coaxial cavity coupling RF signal Granted publication date: 20070314 License type: Exclusive License Record date: 20110315 |
|
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Nanjing Youqiao Electronic Technology Co., Ltd. Assignor: Jingxin Communication Technology (Guangzhou) Co., Ltd. Contract record no.: 2011320000272 Date of cancellation: 20110914 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070314 Termination date: 20121227 |