CN203205512U - Broad-band low-intermodulation load - Google Patents
Broad-band low-intermodulation load Download PDFInfo
- Publication number
- CN203205512U CN203205512U CN 201220739684 CN201220739684U CN203205512U CN 203205512 U CN203205512 U CN 203205512U CN 201220739684 CN201220739684 CN 201220739684 CN 201220739684 U CN201220739684 U CN 201220739684U CN 203205512 U CN203205512 U CN 203205512U
- Authority
- CN
- China
- Prior art keywords
- cable
- coaxial
- load
- low
- radio frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Communication Cables (AREA)
Abstract
Disclosed in the utility model is a broad-band low-intermodulation load that comprises a radio frequency coaxial-cable winding formed by winding of a coaxial cable and a broad-band waveguide-coaxial converter or radio frequency connector connected with the radio frequency coaxial-cable winding. An absorbing medium component is connected to the terminal of the coaxial cable. According to the utility model, because the absorbing medium component is added based on a traditional coiling type low-intermodulation load, the low intermodulation requirement is met, a problem of low return loss of the traditional coiling type load at a low frequency band can be solved, and an application frequency band of the load is broadened.
Description
Technical field
The utility model relates to low intermodulation load, relates in particular to the low intermodulation load of a kind of wideband.
Background technology
Along with the number of carriers of mobile communication system and the continuous increase of power, also more and more higher to the intermodulation requirement of equipment.Indispensable matching unit during load covers as each communication requires also corresponding raising to its intermodulation, thereby impels the generation of various low intermodulation load designs.The at present low common scheme of intermodulation load is the Wound-rotor type load, decline naturally by sufficiently long cable realizes load characteristic exactly, it is formed by connecting by a radio frequency coaxial-cable winding that is formed by the coaxial cable coiling and broadband waveguide-coaxial converter or radio frequency connector, can be applicable to the 200MHz of microwave communication equipment or microwave measurement system under the perfect condition in the frequency range of 40GHz, minimum passive intermodulation level can reach-125dBm even lower, thereby satisfies communication system to the high requirement of intermodulation.But in the reality, because the consideration of factors such as cost, the length of coaxial cable can not be oversize, just lost coupling so general Wound-rotor type loads on 500MHz.
Cable shown in Figure 2 decay schematic diagram, L1, L2 and L3 are representing the attenuation of the cable of equal length varying cross-section diameter respectively, L1 diameter maximum wherein, L3 minimum.As can be seen from Figure 2, the cable of equal length, frequency is more high, and it is more big to decay.Because RL=K * L * 2 (general RL 〉=-23dB, also can require to adjust according to difference), wherein RL is return loss; K is the decline system, the loss of expression when cable length is 1 meter; L is cable length; 2 expression reflected signals need be through 2 declines, and namely behind open circuit or short-circuit end, the transmission path that turns back to input port again is equivalent to the length of 2 times of coaxial cables to signal from input port.As can be seen under the same situation of cable length L, RL is directly proportional with K from formula.The conclusion that draws in conjunction with Fig. 2 and the formula of above-mentioned return loss can draw, and RL is directly proportional with frequency.When frequency very low (as 0MHz), return loss RL is 0, regardless of cable length L, return loss RL can't improve, so the cable echo loss is little when low-frequency range (such as 0MHz), causes the standing wave ratio, the effect of power absorption can't be played, load characteristic can't be realized.
Summary of the invention
The purpose that the utility model provides is to provide a kind of low intermodulation performance that both satisfied, and can realize the low intermodulation load of wideband of low-frequency range load characteristic again.
A kind of wideband hangs down the intermodulation load, comprise the radio frequency coaxial-cable winding that formed by the coaxial cable coiling, with broadband waveguide-coaxial converter that the radio frequency coaxial-cable winding is connected, it is characterized in that: the terminal of described coaxial cable is connected with the absorbing medium parts for consumed power.
A kind of wideband hangs down the intermodulation load, comprise the radio frequency coaxial-cable winding that formed by the coaxial cable coiling, with the radio frequency connector that the radio frequency coaxial-cable winding is connected, it is characterized in that: the terminal of described coaxial cable is connected with the absorbing medium parts for consumed power.
The beneficial effects of the utility model are:
1, compare with general Wound-rotor type load, increased the absorbing medium parts, the load characteristic when being implemented in low-frequency range has been widened the application band of load, the minimum 0MHz that reaches.
2, the absorbing medium parts of Zeng Jiaing can consume the dump power of cable termination, reduce the caloric value of cable, improve heat dispersion.
Description of drawings
Fig. 1 is the overall structure schematic diagram of the low intermodulation load of existing Wound-rotor type;
Fig. 2 is cable decay schematic diagram;
Fig. 3 is the coaxial cable terminal of the low intermodulation load of the existing Wound-rotor type design principle figure during for open circuit;
Design principle figure when Fig. 4 is short circuit for the coaxial cable terminal of the low intermodulation load of existing Wound-rotor type;
Fig. 5 is the design principle figure of the coaxial cable terminal of the utility model embodiment;
Fig. 6 is the frequency response chart of the utility model embodiment.
Embodiment
As Fig. 1 and shown in Figure 5, the low intermodulation load of wideband comprises radio frequency coaxial-cable winding, radio frequency connector and absorbing medium parts.The radio frequency coaxial-cable winding is formed by the coaxial cable coiling, and concrete cable length requires and concrete the setting according to the low intermodulation performance of reality.Difference as required, radio frequency connector can adopt broadband waveguide-coaxial converter to replace.The radio frequency coaxial-cable winding is connected with radio frequency connector or broadband waveguide-coaxial converter, and the coaxial cable terminal of radio frequency coaxial-cable winding connects the absorbing medium parts.Signal is imported from input port, arrives its terminal through coaxial cable, no longer derives behind the signal input absorbing medium parts, and namely signal is absorbed media components and has absorbed.
The described cable of Fig. 2 decay schematic diagram, L1, L2 and L3 are representing the attenuation of the cable of equal length varying cross-section diameter respectively, L1 diameter maximum wherein, L3 minimum.As can be seen from Figure 2, the cable of equal length, frequency is more high, and it is more big to decay.Again because RL=K * L * 2, RL is return loss, K is fading coefficients, the loss of coaxial cable when the expression cable length is 1 meter, L is coaxial cable length, 2 expressions transmit 2 times of process declines, after namely signal arrived open circuit or short-circuit end from input port, the transmission path that turns back to input port again was equivalent to the length of 2 times of coaxial cables.By the formula of return loss as can be seen under the situation of same cable length, return loss RL is directly proportional with fading coefficients K, the same in conjunction with cable length that Fig. 2 draws, the conclusion that frequency is directly proportional with decay, can draw under the situation of same cable length, return loss RL is directly proportional with frequency, and frequency is more low, and return loss is more low.When return loss during greater than-23dB, load characteristic will variation, and frequency is more low, and load characteristic is more poor.As seen, cable type loads on low-frequency range and can not realize good load effect.In theory, cable length is more long, cable resistance is more big, it is also more big to decay, so realize high return loss by increasing cable length, if but realize improving load performance by the length that changes cable, the power of signal all is converted into heat energy by the consumption of cable, can cause cable heating and influence the stability of loaded work piece, also can there be the problem of aspects such as cost, volume in the while.So in real world applications, cable length all can not be infinitely great, as long as can guarantee low intermodulation function.
The overall structure schematic diagram of the low intermodulation load of existing Wound-rotor type as shown in Figure 1, the terminal of its standard coaxial cable be for open circuit, in addition the common situation that also has short circuit.The design principle figure of the coaxial cable terminal of existing load as shown in Figure 3 and Figure 4, coaxial cable terminal be respectively the open circuit and short circuit.Under the situation of terminal for open circuit or short circuit of coaxial cable, signal is from importing with the input port of radio frequency coaxial-cable winding, and through arriving the terminal of coaxial cable behind the coaxial cable, remaining signal generation total reflection feeds back to input port by coaxial cable.Through behind this transmission path, most of power of signal all is converted into thermal energy consumption on coaxial cable, but generally speaking, the limited length of coaxial cable can not be fallen the power consumption of signal fully, so still there is part signal to be fed back to input port, when return loss during greater than-23dB, load performance can be influenced, and along with frequency is more low, load performance can be more poor.
Load in the present embodiment shown in Figure 5 is connected the terminal of coaxial cable 2 with absorbing medium parts 3, is different from the open circuit of traditional Wound-rotor type load or the mode of short circuit.Signal is transferred to absorbing medium parts 3 through coaxial cable 2 after importing by input port 1, the power of signal is converted into heat energy through coaxial cable the time, consumed a part, remaining signal power is absorbed media components 3 and all consumes, be converted into other forms of energy, as heat energy etc., can not cause the derivation of signal, be equivalent to signal and be absorbed media components 3 and absorbed.Under the acting in conjunction by coaxial cable 2 and absorbing medium parts 3, particularly under the situation of low frequency, when only high return loss can't be realized by coaxial cable 2, pass through the mating reaction of absorbing medium parts 3 again, improve return loss, the performance of proof load.In addition, adopt the implementation of traditional Wound-rotor type load, low intermodulation performance that can proof load.
Mode by open circuit or short circuit, signal feed back to input port 1 through coaxial cable 2 at open circuit or short-circuit end again through meeting after the total reflection, and in the transmission course, coaxial cable 2 will generate heat twice, cause the temperature of load too high, and influence the stability of its work.And behind the load signal of the present embodiment process absorbing medium parts 3, all consumed, do not have the derivation of signal, can avoid residual signal to feed back to the situation of input port 1 by coaxial cable 3, can not cause the heating again of coaxial cable, reduce the temperature of load, guaranteed the stability of loaded work piece.
Further, the impedance of absorbing medium parts 3 and coaxial cable 2 couplings, for example 50 ohm coaxial cable 2 can be with 75 ohm absorbing medium parts 3 with the coaxial cable 2 of 3,75 ohm of 50 ohm absorbing medium parts.Preferably, the absorbing medium parts can adopt heavy wall resistance or ceramic resistor, and the electronic component of other big power consumptions is suitable for too.
Further, the load of present embodiment also comprises shielding box 4, is set in the outside of coaxial cable 2 terminals and absorbing medium parts 3, is used for preventing the leakage of electromagnetic signal.
As shown in Figure 6, the standing-wave ratio VWSR of present embodiment≤1.0, return loss≤-26dB, load characteristic is good, and the frequency of load can be low to moderate 0MHz, among Fig. 6 because the restriction of tester, only show 100KHz to the frequency range of 3GHz, and intermodulation inhibition index is good.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (6)
1. low intermodulation load of wideband, comprise the radio frequency coaxial-cable winding that formed by the coaxial cable coiling, with broadband waveguide-coaxial converter that the radio frequency coaxial-cable winding is connected, it is characterized in that: the terminal of described coaxial cable is connected with the absorbing medium parts for consumed power.
2. the low intermodulation load of wideband according to claim 1, it is characterized in that: also comprise shielding box, described shielding box is set in the outside of described coaxial cable terminal and described absorbing medium parts.
3. the low intermodulation load of wideband according to claim 1, it is characterized in that: described absorbing medium parts are heavy wall resistance or ceramic resistor.
4. low intermodulation load of wideband, comprise the radio frequency coaxial-cable winding that formed by the coaxial cable coiling, with the radio frequency connector that the radio frequency coaxial-cable winding is connected, it is characterized in that: the terminal of described coaxial cable is connected with the absorbing medium parts for consumed power.
5. the low intermodulation load of wideband according to claim 4, it is characterized in that: also comprise shielding box, described shielding box is set in the outside of described coaxial cable terminal and described absorbing medium parts.
6. the low intermodulation load of wideband according to claim 4, it is characterized in that: described absorbing medium parts are heavy wall resistance or ceramic resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220739684 CN203205512U (en) | 2012-12-28 | 2012-12-28 | Broad-band low-intermodulation load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220739684 CN203205512U (en) | 2012-12-28 | 2012-12-28 | Broad-band low-intermodulation load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203205512U true CN203205512U (en) | 2013-09-18 |
Family
ID=49149583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220739684 Expired - Fee Related CN203205512U (en) | 2012-12-28 | 2012-12-28 | Broad-band low-intermodulation load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203205512U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067581A (en) * | 2016-07-21 | 2016-11-02 | 斯必能通讯器材(上海)有限公司 | Low passive intermodulation broadband block isolating device |
| 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 |
-
2012
- 2012-12-28 CN CN 201220739684 patent/CN203205512U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067581A (en) * | 2016-07-21 | 2016-11-02 | 斯必能通讯器材(上海)有限公司 | Low passive intermodulation broadband block isolating device |
| CN106067581B (en) * | 2016-07-21 | 2019-04-23 | 斯必能通讯器材(上海)有限公司 | Low passive intermodulation broadband block isolating device |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103367845A (en) | Ultra-wideband micro-strip balance filter | |
| CN113948843A (en) | Broadband 75-ohm impedance dual directional coupler system | |
| CN203205512U (en) | Broad-band low-intermodulation load | |
| CN106207498A (en) | The impedance matching circuit of antenna and terminal | |
| US9246464B2 (en) | Magnetic interface circuit having a 3-wire common mode choke | |
| CN105846026A (en) | Lumped structure microwave amplitude equalizer | |
| CN202818232U (en) | Doherty power amplifying circuit | |
| CN102496775B (en) | Ultrashort wave frequency band broadband antenna | |
| CN207010631U (en) | A kind of multi-octave wideband power amplifer | |
| CN104143672A (en) | Dual-frequency duplexer provided with branchy pitch line loading matching network | |
| CN203734680U (en) | Voltage standing-wave ratio measuring device for short-wave band | |
| CN2922297Y (en) | Circuit for restraining TD-SCDMA communication system transmitting multiple harmonic wave | |
| CN203103472U (en) | Circular-polarization C-frequency-range two-port duplexer | |
| CN211656142U (en) | L-shaped radio frequency matching circuit of zigbee intelligent household wireless module based on EFR32 | |
| CN102938640B (en) | A kind of double frequency impedance matching network | |
| CN202772253U (en) | Four-in-one HF high-power synthesizer | |
| CN208368708U (en) | A kind of high isolation Ka wave band waveguide power distribution/synthesizer | |
| CN111817753A (en) | Zero-insertion-loss medium-voltage coupling device | |
| CN201160112Y (en) | Low-intermodulation passive power termination of microwave frequency band | |
| CN214068872U (en) | Micro ultra-wideband single directional coupler device | |
| CN108777568A (en) | A kind of minimized wide-band power splitter | |
| CN203288727U (en) | Radio-frequency transmission line | |
| CN203351719U (en) | Ultra wideband micro-strip balance filter | |
| CN201490989U (en) | 225 MHz-512 MHz 100W ultra-high power co-address filter | |
| CN206849995U (en) | A kind of wideband high-power synthesizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180322 Address after: 510663 Guangdong city of Guangzhou Province Economic and Technological Development Zone Jinbi Road No. 6 Patentee after: Comba Telecom Systems (Guangzhou) Co., Ltd. Address before: 510663 Guangzhou Science City, Guangdong Shenzhou Road, No. 10 Patentee before: Comba Telecom System (China) Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200122 Address after: 510730 Guangdong city of Guangzhou province Guangzhou economic and Technological Development Zone Jinbi Road No. 6 Patentee after: COMBA TELECOM TECHNOLOGY (GUANGZHOU) Ltd. Address before: 510663 No. 6, layered Road, Guangzhou economic and Technological Development Zone, Guangdong Patentee before: COMBA TELECOM SYSTEMS (GUANGZHOU) Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20201228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |