CN201414118Y - L wave band pre-selection filter - Google Patents
L wave band pre-selection filter Download PDFInfo
- Publication number
- CN201414118Y CN201414118Y CN2009201563713U CN200920156371U CN201414118Y CN 201414118 Y CN201414118 Y CN 201414118Y CN 2009201563713 U CN2009201563713 U CN 2009201563713U CN 200920156371 U CN200920156371 U CN 200920156371U CN 201414118 Y CN201414118 Y CN 201414118Y
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- band
- pass filter
- circuit
- filter
- hilted broadsword
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Abstract
The utility model relates to an L wave band pre-selection filter which comprises a band-pass filter bank module and an end amplifying circuit sequentially connected with each other; the L wave band pre-selection filter has the key points as follows: an input end of the band-pass filter bank module is connected with a front section protection circuit; and the band-pass filter bank module comprisesmore than two band-pass filter circuits and amplifying circuits, wherein each of the amplifying circuits is positioned between two adjacent band-pass filter circuits. The L wave band pre-selection filter has the characteristics of good filtering and frequency-selecting characteristics, wide dynamic range, high sensitivity, strong interference resistance and the like.
Description
Technical field
The utility model belongs to signal and receives the field, is particularly useful for receiver front end filtering L-band interference signal.
Background technology
Traditional preselection filter includes only a band pass filter module usually, as shown in Figure 1.Input signal is imported terminal amplifying circuit module again signal is amplified output behind the bandpass filtering modules block trap signal.Owing to only comprise a filter, therefore traditional preselection filter stopband is good inadequately, has problems such as dynamic range is not high enough, poor anti jamming capability, and because traditional pre-selection filter passband is wide, has introduced unwanted interference signal.
The utility model content
The purpose of this utility model provides a kind of L-band preselection filter that a kind of dynamic range is big, antijamming capability is strong.
The utility model adopts following technical scheme:
A kind of L-band preselection filter comprises the band pass filter pack module and the terminal amplifying circuit that connect successively, and it is characterized in that: the input of band pass filter pack module has the front-end protection circuit; Described band pass filter pack module comprises plural bandwidth-limited circuit and the amplifying circuit between adjacent bandwidth-limited circuit.
Bandwidth-limited circuit by a pair of hilted broadsword N throw switch and be positioned at this in the middle of the hilted broadsword N throw switch, plural band pass filter in parallel forms; Also be connected with logic control circuit on the described hilted broadsword N throw switch, be used for controlling all hilted broadsword N throw switches.
Concrete, wherein the front-end protection circuit is an amplitude limiter, and amplifying circuit is low noise, big dynamically amplifier, and band pass filter is a narrow band filter, and hilted broadsword N throw switch is the multichannel narrowband switch.
This L-band preselection filter, have that the filtering selecting frequency characteristic is good, dynamic range is big, highly sensitive, characteristics such as antijamming capability is strong, the interference signal outer to passband has high inhibition degree, and inhibition can reach more than the 90dB, can guarantee that receiver high-fidelity signal receives.
Description of drawings
Fig. 1 is the theory diagram of known preselection filter;
Fig. 2 is a theory diagram of the present utility model;
Fig. 3 is the concrete schematic diagram of Fig. 2.
Embodiment
Below in conjunction with drawings and Examples the utility model is done detailed description.
Embodiment 1: as shown in Figures 2 and 3, this embodiment comprises front-end protection circuit, two bandwidth-limited circuits and the amplifying circuit between adjacent bandwidth-limited circuit, final stage amplifying circuit and logic control circuit.Wherein bandwidth-limited circuit by a pair of hilted broadsword N throw switch and be positioned at this in the middle of the hilted broadsword N throw switch, plural band pass filter in parallel forms; Also be connected with logic control circuit on the hilted broadsword N throw switch, be used for controlling all hilted broadsword N throw switches.
The course of work of this circuit is as follows, and the L-band radiofrequency signal that is received by antenna is given bandwidth-limited circuit behind the front-end protection circuit protection.Under the control action of logic control circuit, each band pass filter transmission signals of selecting in the bandwidth-limited circuit, its output signal input amplifying circuit amplifies, the signal that is exaggerated is imported next bandwidth-limited circuit, under the control action of logic control circuit, a band pass filter transmission signals of each bandwidth-limited circuit, its output signal input final stage amplifying circuit amplifies output.
As Fig. 3, wherein the front-end protection circuit is an amplitude limiter, and amplifying circuit is low noise, big dynamically amplifier, and band pass filter is a narrow band filter, and hilted broadsword N throw switch is the multichannel narrowband switch.
The L-band radiofrequency signal that is received by antenna enters hilted broadsword N throw switch 1 after the amplitude limiter protection, by the control action of logic control circuit, signal can be selected through 1
1, 1
2, 1
31
nIn the multichannel narrow band filters such as (n＞1) a road transmits.The frequency range of this n narrow band filter is divided as follows, and establishing the common frequency range highest frequency that receives of L-band receiver and the difference of low-limit frequency is Δ F, and Δ F myopia is divided into the N section, so narrow band filter 1
1Band limits can be expressed as: F
1～(F
1+ Δ F/N) (F wherein
1: be slightly less than the low-limit frequency that the L-band receiver receives usually), narrow band filter 1
2Band limits can be expressed as: (F
1+ Δ F/N)～(F
1+ 2 Δ F/N), narrow band filter 1
3Band limits can be expressed as: (F
1+ 2 Δ F/N)～(F
1+ 3 Δ F/N) ... the band limits of narrow band filter 1n can be expressed as: [F
1+ (N-1) Δ F/N]～(F
1+ Δ F).Give hilted broadsword N throw switch 2 through the signal of a filtering, under the control action of logic control circuit, can from the n group narrow band filter that tell the front, select a corresponding path filter, promptly two hilted broadsword N throw switches are selected same filter transmission signals, amplify through the signal input low noise of hilted broadsword N throw switch 2 outputs, big dynamically 3 pairs of small-signals of amplifier, increased the sensitivity of the utility model circuit.And because the application of low noise amplifier, this high-performance L-band preselection filter group has lower noise.
By the big dynamically amplifying circuit amplifying signal of low noise, enter hilted broadsword N throw switch 4, by the control action of logic control circuit, signal can be selected through 4
1, 4
2, 4
34
nTransmit etc. a road in the multichannel narrow band filter.The frequency range of this N narrow band filter is divided with 1
1, 1
2, 1
31
nFrequency range divide consistent.Signal through secondary filtering is given hilted broadsword N throw switch 5, under the control action of logic control circuit, can from foregoing N group band pass filter, select a corresponding path filter, promptly two hilted broadsword N throw switches are selected same filter transmission signals, through the signal input final stage amplifying circuit of hilted broadsword N throw switch 5 outputs.
Signal through secondary switch preselection filter group circuit secondary filtering is given low noise, and big dynamically amplifier 6 amplifies.Export the frequency-selecting amplifying signal at last.
Logic control circuit mainly is that four narrowband switches in one-level switch preselection filter group circuit and the secondary switch preselection filter group circuit are controlled.Make four switches narrow band filter of gating similar frequency bands simultaneously at every turn, to realize the cascade of dual stage filter group.
This programme makes the stopband of whole system obtain optimizing greatly, thereby has improved the dynamic range of product greatly, has also improved the interference free performance of product greatly.
This L-band preselection filter group has adopted the multichannel narrowband switch, the big dynamically amplifier of two-stage narrow band filter group and low noise.Because the cascade of dual stage filter, the stopband of product is greatly improved, and therefore makes well frequency-selective filtering of product, has improved the performance of filtering frequency-selecting, has also enlarged the dynamic range of product simultaneously.Use narrow band filter, the passband of band pass filter is narrowed down, be convenient to the more interference signal of filtering like this, also enlarged the dynamic range of product.Because the big dynamically use of amplifier of low noise, can amplify faint useful signal, highly sensitive, guaranteed the effective reception of receiver to small-signal, also help improving the dynamic range of product, the interference signal outer to passband has high inhibition degree, and inhibition can reach more than the 90dB, can guarantee that receiver high-fidelity signal receives, intermodulation product is low.
Plural bandwidth-limited circuit and the amplifying circuit between adjacent bandwidth-limited circuit can be arranged in the band pass filter pack module of this utility model, and this is all within protection range of the present utility model.
Claims (9)
1, a kind of L-band preselection filter comprises the band pass filter pack module and the terminal amplifying circuit that connect successively, and it is characterized in that: the input of described band pass filter pack module also is connected with the front-end protection circuit; Described band pass filter pack module comprises plural bandwidth-limited circuit and the amplifying circuit between adjacent bandwidth-limited circuit.
2, L-band preselection filter according to claim 1 is characterized in that: described bandwidth-limited circuit by a pair of hilted broadsword N throw switch and be positioned at this in the middle of the hilted broadsword N throw switch, plural band pass filter in parallel forms; Also be connected with logic control circuit on the described hilted broadsword N throw switch, be used for controlling all hilted broadsword N throw switches.
3, L-band preselection filter according to claim 1 and 2 is characterized in that: described front-end protection circuit is an amplitude limiter.
4, L-band preselection filter according to claim 1 and 2 is characterized in that: described amplifying circuit is low noise, big dynamically amplifier.
5, L-band preselection filter according to claim 3 is characterized in that: described amplifying circuit is low noise, big dynamically amplifier.
6, L-band preselection filter according to claim 2 is characterized in that: described band pass filter is a narrow band filter.
7, L-band preselection filter according to claim 2 is characterized in that: described hilted broadsword N throw switch is the multichannel narrowband switch.
8, L-band preselection filter according to claim 5 is characterized in that: described band pass filter is a narrow band filter.
9, L-band preselection filter according to claim 8 is characterized in that: described hilted broadsword N throw switch is the multichannel narrowband switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201563713U CN201414118Y (en) | 2008-12-23 | 2009-06-11 | L wave band pre-selection filter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820099177 | 2008-12-23 | ||
| CN200820099177.1 | 2008-12-23 | ||
| CN2009201563713U CN201414118Y (en) | 2008-12-23 | 2009-06-11 | L wave band pre-selection filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201414118Y true CN201414118Y (en) | 2010-02-24 |
Family
ID=41715997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201563713U Expired - Lifetime CN201414118Y (en) | 2008-12-23 | 2009-06-11 | L wave band pre-selection filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201414118Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445516A (en) * | 2018-03-09 | 2018-08-24 | 西安雷通科技有限责任公司 | Solution in frequency domain device and method |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
-
2009
- 2009-06-11 CN CN2009201563713U patent/CN201414118Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445516A (en) * | 2018-03-09 | 2018-08-24 | 西安雷通科技有限责任公司 | Solution in frequency domain device and method |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
| CN109639253B (en) * | 2018-12-13 | 2023-03-07 | 广州海格通信集团股份有限公司 | Inductor-reusable miniaturized harmonic filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100224 |