CN201378632Y - Dual-band receiving and noise-damping device - Google Patents
Dual-band receiving and noise-damping device Download PDFInfo
- Publication number
- CN201378632Y CN201378632Y CN200920051205U CN200920051205U CN201378632Y CN 201378632 Y CN201378632 Y CN 201378632Y CN 200920051205 U CN200920051205 U CN 200920051205U CN 200920051205 U CN200920051205 U CN 200920051205U CN 201378632 Y CN201378632 Y CN 201378632Y
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Abstract
The utility model relates to a dual-band receiving and noise-damping device which comprises an antenna oscillator and a printed circuit board, the antenna oscillator is directly connected to a circuit board, and a matcher, an amplifier, a filter and a biasing circuit are arranged on the circuit board; the amplifier at least has two-stage amplification, and the biasing circuit thereof is electrified by an output terminal; and the filter is formed by a band-reject filtering circuit. The device utilizes a simple circuit structure, receives all signals of VHF (very high frequency) and UHF (ultra high frequency) bands, reduces the influences caused by noises, and keeps signals at high-gain level.
Description
Technical field
The utility model relates to a kind of antenna receiving unit, particularly relates to a kind of double frequency-band and receives and the noise attenuating device.
Background technology
Existing antenna assembly major part is that full frequency band receives or receives only one of them frequency range, or utilizes a plurality of filters to choose useful frequency band signals, causes the circuit bulky complex like this, and cost increases and increase unavoidably noise.
Summary of the invention
The purpose of this utility model is utilized simple circuit structure exactly, receives VHF and uhf band signal, the influence that attenuating noise caused simultaneously, inhibit signal high-gain again.
For achieving the above object, the utility model adopts following technical scheme:
A kind of double frequency-band receives and the noise attenuating device, and comprising: an antenna oscillator, a printed circuit board (PCB) is characterized in that: antenna oscillator directly is connected on the circuit board, and circuit board is provided with adaptation, amplifier, filter, biasing circuit.
Described adaptation is made up of C1, C2 and L7, and its structure is the T type, and antenna oscillator connects C1, and C2 is connected to amplifier.
Described amplifier has at least two-stage to amplify, its biasing circuit power supply is provided by output, C3 connects the B utmost point of Q1 in the circuit, two E utmost points of Q1 are respectively through R3, R4 ground connection, R1 series connection C3 and R2 are connected in parallel between the B utmost point and the C utmost point of Q1, and the C utmost point of Q1 is through the B utmost point of coupling capacitance C6 connection Q2, and two E utmost points of Q2 are respectively through R7, R8 ground connection, R5 series connection C7 and R6 are connected in parallel between the B utmost point and the C limit of Q2, and the C utmost point of Q2 connects filter.
Described this filter is that a rejector circuit constitutes, filter is by C8, C9, C10, C11, C12, C13, C14, C19, C20, C21, D1, L1, L2, L3, L4, L5, L6 constitutes, C8, L1, L2, L3, L4, L5, C13, the C14 series connection, be connected to output, C9 is in parallel with L1, C10 is in parallel with L2, C11 is in parallel with L4, and C12 is in parallel with L5, and D1 one end connects the node of L1 and C8, one end ground connection, C19 connects with L6, and C19 connects the node that an end connects L1 and L2, the other end ground connection of L6, C20 connects the node of L3 and L4, and C21 connects the node of L4 and L5.
The beneficial effects of the utility model: be to utilize simple circuit structure, can receive whole signals of VHF and uhf band, the influence that attenuating noise caused simultaneously, inhibit signal high-gain again.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Among the figure: 201 adaptations, 202 amplifiers, 203 filters, 204 biasing circuits.
Embodiment
The utility model comprises: an antenna oscillator, a printed circuit board (PCB) is characterized in that: antenna oscillator directly is connected on the circuit board, and circuit board has been provided with adaptation 201, amplifier 202, filter 203, biasing circuit 204.
The antenna oscillator received signal, by amplifier and oscillator impedance matching, by the amplifier amplifying signal, at last through filter output, biasing circuit obtains voltage supply amplifying circuit from output through adaptation in elder generation.The minimum use two-stage of amplifier is amplified, so that signal reaches enough gains in addition.Filter is a band resistance resistance, can be the frequency range filtering between UHF and the VHF.
Described antenna oscillator must be a kind of wide band antenna oscillator, and oscillator can be fixed on the circuit board with any form, but without conductor, in order to avoid introduce other noises.
Adaptation is made up of C1, C2 and L7, and its structure is the T type, and antenna oscillator connects C1, and C2 is connected to amplifier.
Amplifier is that two-stage is amplified.C3 connects the B utmost point of Q1, two E utmost points of Q1 are respectively through R3, R4 ground connection, R1 series connection C3 and R2 are connected in parallel between the B utmost point and the C utmost point of Q1, the C utmost point of Q1 connects the B utmost point of Q2 through coupling capacitance C6, two E utmost points of Q2 are respectively through R7, R8 ground connection, R5 series connection C7 and R6 are connected in parallel between the B utmost point and the C limit of Q2, and the C utmost point of Q2 connects filter.
Filter by C8, C9, C10, C11, C12, C13, C14,, C19, C20, C21, D1, L1, L2, L3, L4, L5, L6 constitute.C8, L1, L2, L3, L4, L5, C13, C14 series connection are connected to output.C9 is in parallel with L1, and C10 is in parallel with L2, and C11 is in parallel with L4, and C12 is in parallel with L5.D1 one end connects the node of L1 and C8, an end ground connection.C19 connects with L6, and C19 connects the node that an end connects L1 and L2, the other end ground connection of L6.C20 connects the node of L3 and L4, and C21 connects the node of L4 and L5.
Connect the D2 negative pole from output through magnet ring inductance T1, the anodal magnet ring inductance T2 that connects of D2, EC18, C15, C22 are connected in parallel between the node and ground of D2 and T2, the EC18 minus earth.T2 connects with T3, and the node between it connects the C utmost point of Q2 through capacitor C 16 ground connection through R9.T3 connects the C utmost point of Q1 through R10.
Claims (4)
1, a kind of double frequency-band receives and the noise attenuating device, and comprising: an antenna oscillator, a printed circuit board (PCB) is characterized in that: antenna oscillator directly is connected on the circuit board, and circuit board is provided with adaptation, amplifier, filter, biasing circuit.
2, a kind of double frequency-band according to claim 1 receives and the noise attenuating device, and it is characterized in that: adaptation is made up of C1, C2 and L7, and its structure is the T type, and antenna oscillator connects C1, and C2 is connected to amplifier.
3, a kind of double frequency-band according to claim 1 receives and the noise attenuating device, it is characterized in that: amplifier has at least two-stage to amplify, its biasing circuit power supply is provided by output, C3 connects the B utmost point of Q1 in the circuit, two E utmost points of Q1 are respectively through R3, R4 ground connection, R1 series connection C3 and R2 are connected in parallel between the B utmost point and the C utmost point of Q1, the C utmost point of Q1 connects the B utmost point of Q2 through coupling capacitance C6, two E utmost points of Q2 are respectively through R7, R8 ground connection, R5 series connection C7 and R6 are connected in parallel between the B utmost point and the C limit of Q2, and the C utmost point of Q2 connects filter.
4, a kind of double frequency-band according to claim 1 receives and the noise attenuating device, it is characterized in that: this filter is that a rejector circuit constitutes, filter is by C8, C9, C10, C11, C12, C13, C14, C19, C20, C21, D1, L1, L2, L3, L4, L5, L6 constitutes, C8, L1, L2, L3, L4, L5, C13, the C14 series connection, be connected to output, C9 is in parallel with L1, C10 is in parallel with L2, C11 is in parallel with L4, C12 is in parallel with L5, D1 one end connects the node of L1 and C8, an end ground connection, and C19 connects with L6, C19 connects the node that an end connects L1 and L2, the other end ground connection of L6, C20 connects the node of L3 and L4, and C21 connects the node of L4 and L5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051205U CN201378632Y (en) | 2009-02-16 | 2009-02-16 | Dual-band receiving and noise-damping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051205U CN201378632Y (en) | 2009-02-16 | 2009-02-16 | Dual-band receiving and noise-damping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378632Y true CN201378632Y (en) | 2010-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920051205U Expired - Fee Related CN201378632Y (en) | 2009-02-16 | 2009-02-16 | Dual-band receiving and noise-damping device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201378632Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170039A (en) * | 2010-02-28 | 2011-08-31 | 上海安费诺永亿通讯电子有限公司 | Built-in antenna system of mobile television |
-
2009
- 2009-02-16 CN CN200920051205U patent/CN201378632Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170039A (en) * | 2010-02-28 | 2011-08-31 | 上海安费诺永亿通讯电子有限公司 | Built-in antenna system of mobile television |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20110216 |