CN202435357U - Wideband high-power coupler for digital television transmitter - Google Patents
Wideband high-power coupler for digital television transmitter Download PDFInfo
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- CN202435357U CN202435357U CN2012200044078U CN201220004407U CN202435357U CN 202435357 U CN202435357 U CN 202435357U CN 2012200044078 U CN2012200044078 U CN 2012200044078U CN 201220004407 U CN201220004407 U CN 201220004407U CN 202435357 U CN202435357 U CN 202435357U
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- coupler
- power coupler
- wideband high
- output
- coupling
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Abstract
The utility model relates to a wideband high-power coupler for a digital television transmitter. The wideband high-power coupler comprises a wideband high-power coupler body, and is characterized in that an input end and an output end of the coupler body are connected with an amplitude equalizer respectively; and the amplitude equalizers have constant impedance symmetrical bridge T-shaped structures. According to the wideband high-power coupler, the input end and the output end of the conventional coupler are provided with equalizers, so that the effect of equalizing amplitudes can be achieved; and the wideband high-power coupler has a simple circuit structure and is high in practical value.
Description
Technical field
The utility model relates to the high-power coupler in a kind of digital TV transmitter broadband.
Background technology
Along with the development of high speed communication lines, people grow with each passing day to the requirement of the bandwidth of raising communication line.In digital TV transmitter, require power amplifier should have sufficiently high power and power amplifier to have high linear, wide dynamic range equally, when promptly digital modulation signals was in dynamic peak value scope, transmitter still had favorable linearity.In the scope of relative narrower; We can ignore gain slope; But for this broadband of digital TV transmitter 470 ~ 806MHZ, if output coupler adopt traditional microstrip coupled to reach whole band output power error ± 0.2dB is the comparison difficulty.Coupling flatness from whole band frequency will reach minimum coupling flatness, and little band of traditional microstrip coupler need reach quarter-wave, if calculate according to 650MHZ, is in the medium of Er=2.55 at dielectric constant, wavelength
=3.0*10
8/
/ 650*10
6=0.289m; So microstrip line need arrive 72mm, if consider forward power coupling line and backward power coupling line, microstrip line will be 144mm; So long microstrip line has not only strengthened the size of complete machine structure; Thereby improve the cost of transmitter, and long microstrip line can cause also loss to increase, reduce power output.
Here we combine accompanying drawing that traditional microstrip coupler coupling flatness and directivity are carried out simple analysis, utilize the traditional microstrip coupler of ADS2008 emulation, and circuit is as shown in Figure 1; Spacing and length that microstrip line is set are variable S1 and L1, and emulation can know that the spacing of microstrip line only changes the coupling amount, to the coupling flatness effect be not very big; And the length that changes microstrip line is bigger to the effect of coupling flatness, and when the length of microstrip line line reached 72mm, the coupling flatness was better relatively; Value reaches about 0.7dB, at this moment the reverse coupled S (3,2) of microstrip coupler; Directivity in the whole band be the poorlyest when 806MHZ to be-9dB; When 470MHZ, be preferably-15.7dB, thus the directivity in the whole band be-9 ~-15.7dB, as shown in Figure 2.Can detected minimum standing wave when directivity is the poorest be 2.1, when standing wave just detect less than 2.1 the time less than.And the standing wave of power amplifier is generally about 1.5, so do not reach requirement.
Summary of the invention
In view of this, the purpose of the utility model provides the high-power coupler in a kind of digital TV transmitter broadband, can effectively play the amplitude equalization effect.
The utility model adopts following scheme to realize: the high-power coupler in a kind of digital TV transmitter broadband; Comprise the high-power coupler body in broadband; It is characterized in that: the input of said coupler body and output are connected with an amplitude equalizer respectively, and said amplitude equalizer is to decide the symmetrical bridge T of resistance type structure.
In the utility model one embodiment, said amplitude equalizer comprises: an input; One output; One first inductance, its first end is connected with said input, and second end is connected with said output through one first electric capacity; One first resistance, its first end is connected with first end of said first inductance, and second end is connected with said output through one second resistance; One second electric capacity, its first end is connected with second end of said first resistance, the second end ground connection; And one second inductance, its first end is connected with first end of said second electric capacity, the second end ground connection.
The utility model circuit structure is simple; Need not existing coupler is done very big change, cost is low, and its compact in size, loss diminish, whole band coupling flatness reduces; Whole band directional performance reaches-18dB and convenient debugging, satisfies the requirement of digital TV transmitter fully.
Description of drawings
Fig. 1 is traditional microstrip line coupler simulation architecture sketch map.
Fig. 2 is whole band coupling flatness of traditional microstrip line and reverse coupled curve synoptic diagram.
Fig. 3 be the utility model embodiment amplitude equalizer decide the symmetrical bridge T of resistance type structure.
Fig. 4 is the attenuation-frequency characteristic curve synoptic diagram of amplitude equalizer.
Fig. 5 is the utility model embodiment coupler simulation architecture sketch map.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Present embodiment provides a kind of digital TV transmitter broadband high-power coupler; Comprise the high-power coupler body in broadband; The input of said coupler body and output are connected with an amplitude equalizer respectively, and said amplitude equalizer is to decide the symmetrical bridge T of resistance type structure.
Specifically, the structure of amplitude equalizer comprises bridge T type, the г type, and three kinds of structures of two-terminal network type, the utility model design is adopted and hindered symmetrical bridge T type structure surely, and is as shown in Figure 3.In order to make the impedance matching at coupler two ends, respectively use an amplitude equalizer at input and output side.This amplitude equalizer comprises: an input; One output; One first inductance, its first end is connected with said input, and second end is connected with said output through one first electric capacity; One first resistance, its first end is connected with first end of said first inductance, and second end is connected with said output through one second resistance; One second electric capacity, its first end is connected with second end of said first resistance, the second end ground connection; And one second inductance, its first end is connected with first end of said second electric capacity, the second end ground connection.This amplitude equalizer mainly is made up of the LRC device, and the value of its inductance and electric capacity (L-C) component parameters can make equalizer produce resonance being higher or lower than on certain frequency of required frequency band.Come the resonance point of moving equilibrium device through the value that changes inductance and electric capacity (L-C) component parameters; Make its transmission characteristic in required bandwidth and the coupling output characteristic complementation of coupling line coupler, thereby the output characteristic that they are combined is smooth in whole working frequency range.As shown in Figure 4, b among the figure
1Be the attenuation-frequency characteristic of original transmission system, b
2Be the attenuation characteristic of equalizer, b
0(=b
1+ b
0=constant) is total attenuation-frequency characteristic, can sees that because the attenuation-frequency characteristic of equalizer is opposite with the attenuation-frequency characteristic of original transmission system just, the attenuation-frequency characteristic of final transmission network is a constant, has played the effect of amplitude equalization, b by figure
0Be that a straight line is under the ideal situation, in the practical application, under the situation that does not influence communication quality, allow certain deviation.
Design is the amplitude equalizer emphasis of design with the complementary amplitude equalizer of coupling line coupler coupling output characteristic.Utilize the coupler of ADS2008 emulation adding amplitude equalizer, as shown in Figure 5.
Below we analyze the coupler coupling flatness and the directivity that add amplitude equalizer:
Microstrip line length is made as variables L, and the inductance L 1 in the bridge T network is made as variables L 1 with L3, and L2 and L4 are made as variables L 2; C1 and C3 are made as variable C1, and C2 and C4 are made as variable C2, through changing the size of these tuning variablees; This circuit is carried out emulation; Can know after the optimization that the length of microstrip line is not clearly to the effect of coupling flatness, influence is each LC value of bridge T network more greatly.Work as L1=L3=47nH, C1=C3=220p, C2=C4=15p, L2=L4=120nH simulates S (3,1) curve, the coupling flatness of this moment is about 0.2dB, when microstrip line length is 10mm, the coupling amount-38.798 ~-39.017dB between.Add coupler behind the amplitude equalizer reverse coupled S (3; 2); Directivity in the whole band be the poorlyest when 806MHZ to be-18dB, when 407MHZ, be preferably-19.65dB, so the interior directivity of whole band be-18 ~-19.65dB; The detected standing wave 1.29 of ability can satisfy the accuracy of detection requirement when directivity was the poorest.
Sensitivity analysis:
In hindering T type symmetrical structure surely, when satisfying Z
11Z
22=R
0 2During condition, its characteristic impedance does not change with frequency change, is convenient to the coupling with other network.Wherein the impedance of L1 and C1 series connection is Z
11,The impedance of L2 and C2 parallel connection is Z
22,R
1=R
2=R
0Because Z
11Be perception and Z
22Be capacitive, so Z
11The components and parts that play a crucial role are L1, L3, and Z
22That play a crucial role is C2, C4.In circuit simulating software the inside with L1, L3 and C2, C4 as tuning variable; The size of tuning this several values can be found out then, and their variation is very big to the influence of the degree of coupling; The coupling amount satisfy technical requirement, this several values is merely able in very little range.Again L2, L4 and C1, C3 as tuning variable, tuning their size can be found out, in very large range changes, the coupling amount still satisfies technical requirement, changes more not obvious.Therefore in the time of actual debug circuit, L1, L3 and C2, C4 are main debugging components and parts.
To sum up each emulation and result of calculation can be known:
(1) utilize the microstrip line of the coupler of amplitude equalization technology to be merely the 72mm that 10mm is significantly shorter than traditional microstrip line coupler, and coupling flatness 0.2dB is also less than the 0.7dB of traditional microstrip line coupler coupling flatness.This structurally can not only realize miniaturization, and can reduce loss.
(2) utilize the coupler of amplitude equalization technology on directivity, obviously to be superior to traditional microstrip line coupler, this will increase the detection range of output standing wave greatly.
See in debugging that (3) utilize the coupler of amplitude equalization technology, C2, C4, L1, L3 are main debugging components and parts, will change the coupling amount than being easier on the convenience, and traditional microstrip line coupler need change the length or the distance of microstrip line and just is achieved.
The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (2)
1. high-power coupler in digital TV transmitter broadband; Comprise the high-power coupler body in broadband; It is characterized in that: the input of said coupler body and output are connected with an amplitude equalizer respectively, and said amplitude equalizer is to decide the symmetrical bridge T of resistance type structure.
2. the high-power coupler in digital TV transmitter according to claim 1 broadband is characterized in that said amplitude equalizer comprises:
One input;
One output;
One first inductance, its first end is connected with said input, and second end is connected with said output through one first electric capacity;
One first resistance, its first end is connected with first end of said first inductance, and second end is connected with said output through one second resistance;
One second electric capacity, its first end is connected with second end of said first resistance, the second end ground connection; And
One second inductance, its first end is connected with first end of said second electric capacity, the second end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200044078U CN202435357U (en) | 2012-01-06 | 2012-01-06 | Wideband high-power coupler for digital television transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200044078U CN202435357U (en) | 2012-01-06 | 2012-01-06 | Wideband high-power coupler for digital television transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN202435357U true CN202435357U (en) | 2012-09-12 |
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ID=46784765
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200044078U Expired - Fee Related CN202435357U (en) | 2012-01-06 | 2012-01-06 | Wideband high-power coupler for digital television transmitter |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346373A (en) * | 2013-06-06 | 2013-10-09 | 中国科学院上海微***与信息技术研究所 | Lumped-parameter broadband 180-degree coupler |
| CN105811894A (en) * | 2016-02-28 | 2016-07-27 | 杭州臻镭微波技术有限公司 | Equalizing network for broadband radio frequency amplifier, broadband radio frequency amplifier and adjusting method |
-
2012
- 2012-01-06 CN CN2012200044078U patent/CN202435357U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346373A (en) * | 2013-06-06 | 2013-10-09 | 中国科学院上海微***与信息技术研究所 | Lumped-parameter broadband 180-degree coupler |
| CN103346373B (en) * | 2013-06-06 | 2016-05-25 | 中国科学院上海微***与信息技术研究所 | Coupler is spent in a kind of broadband 180 of lumped parameter |
| CN105811894A (en) * | 2016-02-28 | 2016-07-27 | 杭州臻镭微波技术有限公司 | Equalizing network for broadband radio frequency amplifier, broadband radio frequency amplifier and adjusting method |
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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: 20120912 Termination date: 20150106 |
|
| EXPY | Termination of patent right or utility model |