CN201160112Y - Low-intermodulation passive power termination of microwave frequency band - Google Patents
Low-intermodulation passive power termination of microwave frequency band Download PDFInfo
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- CN201160112Y CN201160112Y CNU2007200449961U CN200720044996U CN201160112Y CN 201160112 Y CN201160112 Y CN 201160112Y CN U2007200449961 U CNU2007200449961 U CN U2007200449961U CN 200720044996 U CN200720044996 U CN 200720044996U CN 201160112 Y CN201160112 Y CN 201160112Y
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- intermodulation
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Abstract
The utility model relates to a microwave frequency band low intermodulation passive power load, which is formed by winding a broadband waveguide and a coaxial transition section or a coaxial connector and a radio frequency coaxial cable winding of a short circuit/open circuit terminal, by adopting the structure, the microwave frequency band low intermodulation passive power load can be used for a microwave communication equipment with 200 MHZ to 40 GHZ frequency range or in a microwave measuring system, the lowest passive intermodulation electrical level of the laod can reach -125 dBm and even lower, therefore, the actual demands of the communication system which has higher request to intermodulation can be met.
Description
Technical field
The utility model relates to the low intermodulation Passive Power load in microwave or satellite communication transceiver equipment or the microwave measuring equipment field, and particularly (frequency is that 200MHz～40GHz, power are 10～500W) a kind of low intermodulation power load for Waveguide interface or coaxial interface.
Background technology
In the duplex signaling mode of various radio frequency bands, since the passive device (as radio frequency connector, duplexer, filter, lightning arrester, cable wire jumper etc.) in the equipment on material behavior, manufacturing process defective and connect and improperly can produce non-linear phenomena, thereby cause multistage passive intermodulation interference signal, wherein in a single day 3,5,7 higher rank of energy fall into the reception frequency range of duplex signaling, will produce the communication of this system and near system thereof is disturbed.In existing microwave communication system equipment, absorption and coupling as power will be used passive load (Passive Termination) in a large number, the form of its main flow generally has 2 kinds: 1. the load of resistance chip as shown in Figure 1, described load is fixed into one by power resistor sheet 1 and ring flange 2 and forms, 2. the absorption load of carbon film/graphite as shown in Figure 2, described load is by waveguide flange 3,1/4 wavelength waveguide 4, graphite-like absorbs piece 5 and forms, above-mentioned two kinds of loads, the load of resistance chip is widely used in all kinds of 50～75 Ω radio systems, the absorption load of carbon film/graphite is mainly used in the higher waveguide transmission system of frequency, yet in the communication system that intermodulation is had relatively high expectations as satellite repeater, earth station equipment, measuring system etc., the intrinsic intermodulation level of the detection of resistor disc or carbon film/graphite absorption pattern higher (the former the former-30～-90dBm between, the latter-60～-90dBm between), the ability of the input power that it bears is not enough, therefore, this feature cause it directly to be used in the occasion that the passive intermodulation index is had higher requirements (for example the PIM value≤-120dBm).
Summary of the invention
The purpose of this utility model is for overcoming the deficiency of above-mentioned background technology, the low intermodulation Passive Power load of a kind of 200MHz of being used for～40GHz frequency range microwave communication equipment or microwave measurement system is provided, can satisfies the actual needs of the communication system that intermodulation is had higher requirements.
In order to solve the problems of the technologies described above, the utility model microwave frequency band hangs down the load of intermodulation Passive Power, combined with the radio frequency coaxial-cable winding of a terminal short circuit/open circuit by a wideband waveguide-coaxial conversion joint, radio frequency coaxial-cable winding and save with wideband waveguide-coaxial conversion is connected.
Described microwave frequency band hangs down the load of intermodulation Passive Power, and wherein, described radio frequency coaxial-cable winding is made up of around the radiator of an aluminium matter cylinder or square the radio frequency coaxial-cable of terminal short circuit/open circuit.
Described microwave frequency band hangs down the load of intermodulation Passive Power, wherein, can make the fin inserting type heat radiator form to the coaxial radio-frequency spool stand, and DC fan, perhaps described radio frequency coaxial-cable winding is made up of around a coaxial radio-frequency spool stand the radio frequency coaxial-cable of terminal short circuit/open circuit, installs radiator additional in coaxial radio-frequency spool stand both sides.
Adopt the low intermodulation Passive Power load of said structure microwave frequency band, can be used in 200MHz～40GHz frequency range microwave communication equipment or the microwave measurement system, the minimum passive intermodulation level of this class load can reach-125dBm even lower, thereby can satisfy the actual needs of the communication system that intermodulation is had higher requirements.And load has better radiating effect, but bigger input power is born in load.
Description of drawings
Fig. 1 is the structural representation of resistance chip load in the prior art
Fig. 2 is the structural representation of the absorption load of carbon film graphite in the prior art
Fig. 3 is the overall structure schematic diagram of first kind of embodiment of the utility model
Fig. 4 is the structural representation of second kind of embodiment of the utility model
Fig. 5 is the structural representation that the utility model is provided with fin inserting type heat radiator
Fig. 6 is provided with the structural representation of the coaxial radio-frequency spool of profile of tooth radiator
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
In order to solve the problems of the technologies described above, the utility model microwave frequency band hangs down the load of intermodulation Passive Power, comprise a wideband waveguide-coaxial conversion joint 17 and one radio frequency coaxial-cable winding 19, radio frequency coaxial-cable winding 19 links together with wideband waveguide-coaxial conversion joint 17, can save wideband waveguide-coaxial conversion joint 17 according to purposes, and radio frequency coaxial-cable winding 19 is connected suitable radio frequency connector, directly use as power termination, this microwave frequency band hangs down the load of intermodulation Passive Power, wherein, can adopt air-cooled radiating mode, radio frequency coaxial-cable winding 19 can be made up of radio frequency coaxial-cable 8 and radiator, radio frequency coaxial-cable 8 is fastened on the outer peripheral face of radiator, radio frequency coaxial-cable 8 is the coaxial cable of a terminal for open circuit or short circuit 9, its radiator is aluminium matter cylinder or square, also radiator can be made fin inserting type heat radiator 13 forms, and add a DC fan 12 at an end of fin inserting type heat radiator 13, perhaps adopt the natural cooling radiating mode, radio frequency coaxial-cable winding 19 wherein is made up of with a coaxial radio frequency spool stand 15 radio frequency coaxial-cable 8 of terminal short circuit/open circuit, radio frequency coaxial-cable 8 is around in described coaxial radio-frequency spool stand 15 outer peripheral faces, install radiator 14 additional at the two ends of coaxial radio-frequency spool stand 15, this radiator 14 is the dentation radiator, during installation radio frequency coaxial-cable winding 19 is fixed in the aluminum shell, its top screw one baffle plate, baffle plate radio frequency coaxial-cable winding 19 retaining in the enclosure, described broadband waveguide-coaxial conversion joint 17 usefulness fixed supports be fixed on shell sidewall on.
The utility model also can be made up of coaxial connector 7 and radio frequency coaxial-cable winding 19, and described radio frequency coaxial-cable winding 19 is connected with coaxial connector 7, and other structure is same as the previously described embodiments.
Adopt the low intermodulation Passive Power load of said structure microwave frequency band, the ability of bearing input power is bigger, can be used for 200MHz～40GHz frequency range microwave communication equipment or microwave measurement system, can satisfy the actual needs of the communication system that intermodulation is had higher requirements, its passive intermodulation level can reach-125dBm even lower, in order to make load that better radiating effect be arranged, can make the fin inserting type heat radiator form to coaxial radio-frequency spool 17, and DC fan 12, perhaps install radiator additional in coaxial radio-frequency spool stand 10 both sides, can make load bear bigger input power like this, the theoretical foundation that coaxial cable can serve as the radio-frequency power load is: 1., according to transmission line theory, when a short/open transmission line during than the wavelength manyfold, its sending-end impedance trends towards its characteristic impedance.2., because this is that consumption short/open transmission line is arranged, to input term signal meeting total reflection, only signal transmission path is 2 times of cable length, therefore signal can be attenuated in incident and reflection process, when the cable long enough, incoming signal just has only small reflection to arrive the incident port, and most of signal energy becomes thermal energy consumption on cable.3., the diameter of cable and length selects for use the lowest signal frequency and the maximal input that use with reality relevant.Generally speaking, for passive load of design, when frequency one timing, the diameter of cable is more little, and it is low more that it bears power, but needs with length short (because the loss of Thin cable itself is bigger); The diameter of cable is big more, and it is also high more that it bears power, but needs with length longer (otherwise not reaching enough port return loss value).Now illustrate the utility model:
Example 1: design a passive low intermodulation load, require: input power Pin=20W, frequency range: 4.5～5.6GHz, return loss R
L≤-18dB, intermodulation PIM≤-115dBm.
According to power, select 670-141 or RG405 cable all can, just latter's length is shorter, tables look-up: cable attenuation is 0.8dB/m during 670-1414.5GHz, and cable attenuation is 1.13dB/m during 5.6GHz, according to the formula of the required cable minimum length of load:
Lmin 〉=R
L/ (2 * I
L/ M) R
L: the minimum echo loss
I
L/ M: cable unit length loss
Calculate: Lmin 〉=1/2 * 18/0.8=11.25m, round numbers 12m here.
Checking computations: during 4.5GHz, return loss R
L=12m * 0.8dB/m * 2=19.2dB
5.6GHz the time, return loss R
L=12m * 1.13dB/m * 2=27.12dB
After the wideband waveguide-coaxial conversion joint joins, actual measurement return loss R on the HP network analyzer
LFor:
18.6dB @4.5GHz 24.6dB @5.6GHz
Conclusion: more approaching with calculated value.5.6G the time more lower slightly than Theoretical Calculation, estimation be because waveguide-the good inadequately influence that is caused of coaxial conversion joint return loss.
Actual measurement intermodulation value PIM on " PIMTEK " passive cross modulation test instrument is:
-122.1dBm@4.5GHz -119.8dBm@5.6GHz
Example 2: design a passive low intermodulation load of mobile communication frequency range, require: input power Pin=50W, frequency range 860MHz～2200MHz, return loss R
L≤-16.5dBm, intermodulation PIM≤-120dBm.
According to power selection 670-141 cable.Table look-up:
670-141 cable cable attenuation when 860MHz is approximately 0.33dB/m, and the decay when 2200MHz is about 0.55dB/m.Therefore the formula according to the required cable minimum length of load calculates:
Lmin 〉=1/2 * 16.5/0.33=25m gets 27m here.
Checking computations: during 860MHz, return loss R
L=27m * 0.33dB/m * 2=17.82dB
During 2200MHz, return loss R
L=27m * 0.55dB/m * 2=29.7dB
Measured result is on the HP network analyzer:
16.35dB (the most not good enough) @860MHz 26.65dB (the most not good enough) @2200MHz
Conclusion: differ about 10% with result of calculation.
At " PIMTEK " 900MHz, the result who measures on the 2100MHz frequency range passive cross modulation test instrument is:
1. PIM=-124.3dBm @800MHz frequency range (2 * 20W, 3 rank)
2. PIM=-121.4dBm @2100MHz frequency range (2 * 20W, 3 rank)
3. PIM=-136.2dBm @2100MHz frequency range (2 * 20W, 7 rank)
Claims (4)
1, the low intermodulation Passive Power load of microwave frequency band, it is characterized in that: be made up of a coaxial connector (7) and a radio frequency coaxial-cable winding (19), described radio frequency coaxial-cable winding (19) is connected with coaxial connector (7).
2, the low intermodulation Passive Power load of microwave frequency band is characterized in that: a wideband waveguide-coaxial conversion joint (17) is formed with a radio frequency coaxial-cable winding (19), and described radio frequency coaxial-cable winding (19) is connected with wideband waveguide-coaxial conversion joint (17).
3, according to claim 1 or the low intermodulation Passive Power load of 2 described microwave frequency bands, it is characterized in that: described radio frequency coaxial-cable winding (19) is made up of a radio frequency coaxial-cable (8) and a fin inserting type heat radiator (13), described radio frequency coaxial-cable (8) is around in described fin inserting type heat radiator (13) outer peripheral face, and the one end adds a DC fan (12).
4, according to claim 1 or the low intermodulation Passive Power load of 2 described microwave frequency bands, it is characterized in that: described radio frequency coaxial-cable winding (19) is made up of a radio frequency coaxial-cable (8) and a coaxial radio frequency spool stand (15), described radio frequency coaxial-cable (8) is around in described coaxial radio-frequency spool stand (10) outer peripheral face, and described coaxial radio-frequency spool stand (15) both sides install radiator (14) additional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200449961U CN201160112Y (en) | 2007-11-16 | 2007-11-16 | Low-intermodulation passive power termination of microwave frequency band |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200449961U CN201160112Y (en) | 2007-11-16 | 2007-11-16 | Low-intermodulation passive power termination of microwave frequency band |
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| CN201160112Y true CN201160112Y (en) | 2008-12-03 |
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| CNU2007200449961U Expired - Fee Related CN201160112Y (en) | 2007-11-16 | 2007-11-16 | Low-intermodulation passive power termination of microwave frequency band |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009137873A1 (en) * | 2008-05-13 | 2009-11-19 | Triasx Pty Ltd | Apparatus for applying a load |
| CN102361143A (en) * | 2011-09-30 | 2012-02-22 | 合肥威科电子技术有限公司 | Broadband low-intermodulation attenuator |
| WO2016206436A1 (en) * | 2015-06-26 | 2016-12-29 | 中兴通讯股份有限公司 | Load device for dissipating microwave energy and communications apparatus |
| CN109904573A (en) * | 2017-12-07 | 2019-06-18 | 罗德施瓦兹两合股份有限公司 | For the dummy load of high power and high bandwidth |
-
2007
- 2007-11-16 CN CNU2007200449961U patent/CN201160112Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7696850B2 (en) | 2007-11-08 | 2010-04-13 | Triasx Pty Ltd. | Apparatus for applying a load |
| WO2009137873A1 (en) * | 2008-05-13 | 2009-11-19 | Triasx Pty Ltd | Apparatus for applying a load |
| CN102361143A (en) * | 2011-09-30 | 2012-02-22 | 合肥威科电子技术有限公司 | Broadband low-intermodulation attenuator |
| WO2016206436A1 (en) * | 2015-06-26 | 2016-12-29 | 中兴通讯股份有限公司 | Load device for dissipating microwave energy and communications apparatus |
| CN109904573A (en) * | 2017-12-07 | 2019-06-18 | 罗德施瓦兹两合股份有限公司 | For the dummy load of high power and high bandwidth |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081203 Termination date: 20151116 |
|
| EXPY | Termination of patent right or utility model |