CN2229731Y - Device for eliminating parasitic oscillation and reducing harmonic impedance - Google Patents
Device for eliminating parasitic oscillation and reducing harmonic impedance Download PDFInfo
- Publication number
- CN2229731Y CN2229731Y CN 95207602 CN95207602U CN2229731Y CN 2229731 Y CN2229731 Y CN 2229731Y CN 95207602 CN95207602 CN 95207602 CN 95207602 U CN95207602 U CN 95207602U CN 2229731 Y CN2229731 Y CN 2229731Y
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- CN
- China
- Prior art keywords
- parasitic oscillation
- high frequency
- pass filter
- harmonic impedance
- coupling capacitance
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- Expired - Fee Related
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- 230000010355 oscillation Effects 0.000 title claims abstract description 16
- 230000003071 parasitic effect Effects 0.000 title claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 230000008030 elimination Effects 0.000 claims description 6
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 8
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- Microwave Amplifiers (AREA)
Abstract
The utility model provides a device for eliminating broadcasting transmitter power amplifier high frequency parasitic oscillation reduces harmonic impedance, it is by high pass filter, and broadband matching resistance and coupling capacitance constitute. The device can effectively restrain high-frequency parasitic oscillation in the whole ultrahigh frequency range to reduce the impedance of a high-order resonant mode, and the resistance can neglect the useful power loss in the working frequency range, so that the machine works stably and reliably.
Description
The utility model provides a kind of device that parasitic oscillation reduces harmonic impedance of eliminating, and particularly is used for eliminating the high frequency parasitic oscillation reduction harmonic impedance of radio transmitter electron tube power amplifier.
The anode loop of transmitter electron tube power amplifier is by the electron tube output capacitance, the inductance of resonant tank, electric capacity, distributed capacitance, lead-in inductance are formed, lead-in inductance wherein, the output capacitance of distributed capacitance and electron tube, the element of resonant tank etc. can be formed the spurious resonance loop in being higher than the very wide frequency range of operating frequency, wing can produce the high impedance of higher mode, this produces stronger high order harmonic component in the time of just may making amplifier produce high frequency parasitic oscillation or work, causes job insecurity or can not work at all.
The conventional method of eliminating the parasitic oscillation of discharge-tube amplifier high frequency has two kinds; 1) near more upright clavate noninductive resistances wing, an end ground connection of resistance, the other end is unsettled, with the distributed capacitance formation RC absorption network of these resistance and resistance.2) on the lead-in wire of forming the spurious resonance loop noninductive resistances more in parallel to reduce the impedance in spurious resonance loop.
The shortcoming of conventional method is: the available power that 1) will consume more operating frequency; 2) consumed power is big in the high power amplifier, and resistance heating is serious, force cooling, thereby makes complex structure; 3) these resistance will be placed in specific place; 4) frequency range that works is narrower.
Task of the present utility model is intended to overcome the deficiencies in the prior art, the device that provide that a kind of energy consumption is low, effect wide frequency range, elimination power amplifier high frequency parasitic oscillation simple in structure reduces harmonic impedance, it is characterized in that: a high pass filter one end connects the amplifier electron tube anode by coupling capacitance, another termination Broadband Matching resistance, the other end ground connection of Broadband Matching resistance.
The feature of said apparatus also is: 1) high pass filter that is adopted is that three rank or three rank are above; It is by being capacitor C
1, C
2And inductance L
1Form C
1With C
2Series connection, L
1One be terminated at C
1, C
2The centre, other end ground connection.2) coupling capacitance is less than the design load of first electric capacity of filter.Actually be to use a capacitor C
1, C
1Capacitance be the capacitance values that desired coupling capacitance and first electric capacity of high pass filter are in series, both made coupling capacitance, also be first electric capacity of high pass filter simultaneously; 3) resistance of used Broadband Matching resistance should make the reflection loss in the high order harmonic component scope of operating frequency very little.
Fig. 1 is concrete structure figure of the present utility model.
The electron tube of 1--amplifier;
2--is the capacitor C between wing and the filter
1
The capacitor C of 3--filter
2
The inductance L of 4--filter
1
The 5--high frequency cable;
6--Broadband Matching resistance R.
Embodiment: as seen from Figure 1, capacitor C
1Connect wing, the inductance L of another termination high pass filter
1With filter capacitor C
2, inductance L
1Other end ground connection, filter capacitor C
2Connect the Broadband Matching resistance R by high frequency cable, the other end ground connection of resistance R.For the final stage discharge-tube amplifier of PDM150KW short-wave broadcast transmitter, the cut-off frequecy of passband f of high pass filter
o=52MHZ, characteristic impedance is 50 ohm, capacitor C
1Capacitance be 11PF, the impedance of Broadband Matching resistance is 50 ohm, the reflection loss in the uhf-range can bear the power of 300w less than-20dB.
Another embodiment of the present utility model is C
2With directly link to each other between the Broadband Matching resistance R, no high frequency cable, all the other are constant
The utility model compared with prior art has following outstanding effect: in whole uhf-range The interior impedance that can effectively suppress high frequency unwanted oscillation reduction high order spurious resonance mould. Machine works Reliable and stable, broadband resistance can be ignored to the available power loss in the operating frequency range.
Claims (6)
1. one kind is used for the device that the broadcast transmitter power amplifier is eliminated high frequency parasitic oscillation reduction harmonic impedance, it is characterized in that: a high pass filter, one end links by coupling capacitance and amplifier electron tube anode, another termination Broadband Matching resistance, the other end ground connection of Broadband Matching resistance.
2. reduce the device of harmonic impedance according to the parasitic oscillation of the said elimination high frequency of claim 1, it is characterized in that high pass filter is that three rank or three rank are above.
3. claim 1,2 said elimination high frequency parasitic oscillation reduce the device of harmonic impedances, it is characterized in that with an electric capacity both as first electric capacity of filter, also the coupling capacitance that is connected with wing of conduct.
4. a device that is used for broadcast transmitter power amplifier elimination high frequency parasitic oscillation reduction harmonic impedance is characterized in that: a high pass filter, the one end links by coupling capacitance and amplifier electron tube anode, the other end links by high frequency cable and Broadband Matching resistance, the other end ground connection of Broadband Matching resistance.
5. reduce the device of harmonic impedance according to the parasitic oscillation of the said elimination high frequency of claim 4, it is characterized in that high pass filter is that three rank or three rank are above.
6. reduce the device of harmonic impedances according to claim 4,5 said elimination high frequency parasitic oscillation, it is characterized in that with an electric capacity, also the coupling capacitance that is connected with wing of conduct both as first electric capacity of filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95207602 CN2229731Y (en) | 1995-04-06 | 1995-04-06 | Device for eliminating parasitic oscillation and reducing harmonic impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95207602 CN2229731Y (en) | 1995-04-06 | 1995-04-06 | Device for eliminating parasitic oscillation and reducing harmonic impedance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2229731Y true CN2229731Y (en) | 1996-06-19 |
Family
ID=33859186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95207602 Expired - Fee Related CN2229731Y (en) | 1995-04-06 | 1995-04-06 | Device for eliminating parasitic oscillation and reducing harmonic impedance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2229731Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811156A (en) * | 2015-05-14 | 2015-07-29 | 中国电子科技集团公司第五十四研究所 | Resonance enhanced type broadband impedance matching circuit and matching method |
-
1995
- 1995-04-06 CN CN 95207602 patent/CN2229731Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811156A (en) * | 2015-05-14 | 2015-07-29 | 中国电子科技集团公司第五十四研究所 | Resonance enhanced type broadband impedance matching circuit and matching method |
| CN104811156B (en) * | 2015-05-14 | 2018-08-14 | 中国电子科技集团公司第五十四研究所 | A kind of matching process for harmonic intensified broadband impedance matching circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |