Summary of the invention
The utility model purpose is to provide a kind of amplifier system of front screen printed antenna for automobiles at above-mentioned weak point, partly is made up of front screen printed antenna part, antenna amplifier antennafire.The antenna amplifier antennafire electronic circuit board adopts two-sided copper foil laminate, dwindles the antenna amplifier antennafire volume greatly, has realized miniaturization, is convenient to install and use, and input, the output impedance height that matches, gains receive amplitude modulation, FM signal is effective.
Amplifier system of front screen printed antenna for automobiles takes following scheme to realize: amplifier system of front screen printed antenna for automobiles partly is made up of front screen printed antenna part, antenna amplifier antennafire, front screen printed antenna partly has the front window windshield, be printed with frequency modulation, amplitude modulation combination printed antenna on the front window windshield, and be provided with the aerial signal lead-out terminal.Described frequency modulation, amplitude modulation combination printed antenna link to each other with the aerial signal lead-out terminal by lead.FMAM combination printed antenna is printed on front window windshield top.
Described FMAM combination printed antenna adopts silver slurry printed antenna.
Antenna amplifier antennafire partly comprises antenna amplifier antennafire shell, support, electronic circuit board, signal output plug, power input socket, parallel coaxial-cable output line, aerial signal input terminal and high-frequency signal connecting line; Electronic circuit board is housed on the support, and support is provided with installing hole, and outer cover suit is on support.
Electronic circuit board is provided with electronic circuit, and the antenna amplifier antennafire electronic devices and components are housed, and electronic circuit board one end is connected with the aerial signal input terminal by the high-frequency signal connecting line, and the aerial signal input terminal links to each other with the aerial signal lead-out terminal; The parallel coaxial-cable output line, wherein one one end links to each other with electronic circuit board, and the other end is connected with the signal output plug, the signal output plug links to each other with receiver, the parallel coaxial-cable output line, wherein another root one end links to each other with electronic circuit board, and the other end links to each other with power input socket.
Described electronic circuit board adopts two-sided copper foil laminate.Described parallel coaxial-cable line is equipped with the lint plastic boot outward.
Electronic circuit comprises amplitude modulation input frequency selection circuit, amplitude modulation amplifying circuit, amplitude modulation output frequency selection circuit, frequency modulation input frequency selection circuit, frequency modulation amplifying circuit, frequency modulation output circuit, power circuit and electrostatic discharge protective circuit.
Amplitude modulation input frequency selection circuit comprises capacitor C
1, capacitor C
2, inductance L
1And resistance R
1
The amplitude modulation amplifying circuit comprises resistance R
2, R
3, R
4, R
5, R
6, R
7, R
8, field effect transistor Q
1, Q
2, capacitor C
3, C
4, C
5And inductance L
2
Amplitude modulation output frequency selection circuit comprises capacitor C
6, resistance R
9And inductance L
3
Frequency modulation input frequency selection circuit comprises capacitor C
7, C
8, C
9, C
10And inductance L
4, L
5
The frequency modulation amplifying circuit comprises resistance R
10, R
11, R
12, R
13, R
14, R
15, capacitor C
11, C
13, C
15, inductance L
6With triode V
3
The frequency modulation output circuit comprises resistance R
20And capacitor C
12
Power circuit comprises resistance R
16, R
17, R
18, capacitor C
16, C
17, inductance L
7, triode V
4, V
5, diode D
2, voltage-stabiliser tube D
1
Electrostatic discharge protective circuit adopts static to protect device G
1Electrostatic protector G
1Adopt commercially available FESD electrostatic protector.
The capacitor C of amplitude modulation input frequency selection circuit in the electronics electric line
1One termination shield glass aerial signal lead-out terminal, electrostatic protector G
1One end and shield glass aerial signal lead-out terminal and capacitor C
1Link to each other electrostatic protector G
1Other end ground connection.Capacitor C
1The other end and inductance L
1, resistance R
1Link to each other inductance L
1Resistance R
1The other end passes through capacitor C
2With the resistance R in the amplitude modulation amplifier
2, field effect Q
1, Q
2Grid links to each other, field effect transistor Q
1Source electrode connect R
5, capacitor C
3, field effect transistor Q
2Source electrode and capacitor C
4, resistance R
7Link to each other capacitor C
3The other end and capacitor C
4, resistance R
6Link to each other field effect Q
1With field effect transistor Q
2The drain electrode parallel connection after and inductance L
2, resistance R
8Link to each other inductance L
2, resistance R
8The other end and capacitor C
5And the inductance L of power circuit
7, capacitor C
16, C
17Link to each other.
Capacitor C in the amplitude modulation output frequency selection circuit
6Resistance R in one end and the amplitude modulation amplifying circuit
8Inductance L
2Link to each other the other end and inductance L
3, resistance R
9Link to each other inductance L
3, resistance R
9Another termination parallel coaxial-cable signal output part OUT.
Capacitor C in the frequency modulation input frequency selection circuit
7One end passes through capacitor C
1Connect shield glass aerial signal lead-out terminal, capacitor C
7The other end pass through inductance L
4Connect inductance L
5, capacitor C
8, C
9, capacitor C
9Connect capacitor C
10
Biasing resistor R in the frequency modulation amplifying circuit
10, R
11Capacitor C in one end and the frequency modulation input frequency selection circuit
9With triode V
3Base stage connects, resistance R
11The other end passes through resistance R
12, capacitor C
11With triode V
3Collector electrode, inductance L
6Link to each other triode V
3Emitter and resistance R
13Link to each other inductance L
6The other end and resistance R
14, capacitor C
13Link to each other resistance R
14The other end passes through resistance R
15With capacitor C
15And the capacitor C in the power circuit
16, inductance L
7Link to each other.
Resistance R in the frequency modulation output circuit
20Triode V in one end and the frequency modulation amplifying circuit
3Collector electrode, inductance L
6, resistance R
20Link to each other another termination capacitor C
12, capacitor C
12Another termination parallel coaxial-cable signal output part OUT.
In the power circuit, inductance L
7One end and capacitor C
16, C
17Link to each other electric capacity L
7Another termination triode V
4Collector electrode, triode V
4Emitter and triode V
5Emitter, diode D
2Negative pole, resistance R
18Link to each other diode D
2Positive pole connects power supply; Triode V
4Base stage connecting resistance R
16, triode V
5Collector electrode, triode V
5Base stage is passed through resistance R
17With resistance R
18, voltage-stabiliser tube D
1Negative pole links to each other, voltage-stabiliser tube D
1Plus earth.
Operation principle:
When antenna signal process capacitor C
1, inductance C
2Frequency-selecting goes out amplitude-modulated signal, delivers to field effect transistor Q
1, Q
2Grid, resistance R
2, R
3, R
4Field effect transistor Q is provided
1, Q
2Bias current, resistance R
5Be Q
1DC feedback resistance, resistance R
7Be Q
2DC feedback resistance, capacitor C
3Be Q
1Ac coupling capacitor, capacitor C
4Be Q
2Ac coupling capacitor, pass through resistance R
6Exchange negative feedback, inductance L
2And resistance R
8Be field effect transistor Q
1, Q
2Collector load, signal is through field effect transistor Q
1, Q
2Amplify, by capacitor C
6, inductance L
3, resistance R
9Frequency-selecting output amplitude-modulated signal is to signal coaxial cable signal output part DUT;
When antenna signal process capacitor C
7, inductance L
4, L
5, capacitor C
8Pass through capacitor C after the frequency-selecting again
9, C
10Select FM signal after the dividing potential drop and deliver to triode V
3Base stage, resistance R
10, R
11, R
12Triode V is provided
3Bias current, capacitor C
11Be triode V
3Voltage negative feedback, resistance R
13Be triode V
3Current Negative Three-Point Capacitance is guaranteed the stability of amplifier, through triode V
3The amplification of radiating circuit altogether is through resistance R
20, capacitor C
12The output FM signal is to parallel coaxial-cable signal output part DUT.
External power supply is by diode D
2Unidirectional conducting provides triode V
5, V
5Emitter voltage, resistance R
18Give voltage stabilizing didoe D
1Provide a direct voltage, R
17Give triode V
5Provide a direct voltage, triode V
5Collector electrode give V
4Base stage provides a bias voltage, when external power during greater than 18V, and triode V
4The overvoltage protection effect is played in not conducting.Inductance L
7, capacitor C
16, C
17Carry out filtering to power supply.
Electrostatic protector G
1, when electrostatic pulse voltage reaches, during 140V, electrostatic protector G
1Conducting protection field effect transistor Q
1, Q
2, triode V
3
The utility model amplifier system of front screen printed antenna for automobiles is reasonable in design, compact conformation, and electronic circuit board dwindles the antenna amplifier antennafire volume greatly owing to adopt two-sided copper foil laminate, has realized miniaturization, is convenient to install and use.Power circuit is reasonable in design, surpasses 18V and protects automatically.Amplifier system of front screen printed antenna for automobiles input, the output impedance height that matches, gains receives amplitude modulation, FM signal is effective.
Embodiment
With reference to accompanying drawing 1,2, amplifier system of front screen printed antenna for automobiles partly is made up of front screen printed antenna part, antenna amplifier antennafire, front screen printed antenna partly has front window windshield 1, be printed with frequency modulation, amplitude modulation combination printed antenna 2 on the front window windshield, and be provided with aerial signal lead-out terminal 3.Described frequency modulation, amplitude modulation combination printed antenna link to each other with the aerial signal lead-out terminal by printed circuit cable.FMAM combination printed antenna is printed on front window windshield 1 top.
Described FMAM combination printed antenna 1 adopts silver slurry printed antenna.
Antenna amplifier antennafire partly comprises antenna amplifier antennafire shell 5, support 6, electronic circuit board, signal output plug 9, power input socket 10, parallel coaxial-cable output line 8, aerial signal input terminal 4 and high-frequency signal connecting line 11; 6 are equipped with electronic circuit board on the support, and support 6 is provided with installing hole, and shell 5 is sleeved on the support.
Electronic circuit board is provided with electronic circuit, and the antenna amplifier antennafire electronic devices and components are housed, and electronic circuit board one end is connected with aerial signal input terminal 4 by high-frequency signal connecting line 11, and aerial signal input terminal 4 links to each other with aerial signal lead-out terminal 3; Parallel coaxial-cable output line 8, wherein one one end links to each other with electronic circuit board, and the other end is connected with signal output plug 9, signal output plug 9 links to each other with receiver 7, parallel coaxial-cable output line 8, wherein another root one end links to each other with electronic circuit board, and other end power input socket 10 links to each other.
Described electronic circuit board adopts two-sided copper foil laminate.The described parallel coaxial-cable output line 8 outer lint plastic boots that are equipped with.
Electronic circuit comprises amplitude modulation input frequency selection circuit, amplitude modulation amplifying circuit, amplitude modulation output frequency selection circuit, frequency modulation input frequency selection circuit, frequency modulation amplifying circuit, frequency modulation output circuit, power circuit and electrostatic discharge protective circuit.
Amplitude modulation input frequency selection circuit comprises capacitor C
1, capacitor C
2, inductance L
1And resistance R
1
The amplitude modulation amplifying circuit comprises resistance R
2, R
3, R
4, R
5, R
6, R
7, R
8, field effect transistor Q
1, Q
2, capacitor C
3, C
4, C
5And inductance L
2
Amplitude modulation output frequency selection circuit comprises capacitor C
6, resistance R
9And inductance L
3
Frequency modulation input frequency selection circuit comprises capacitor C
7, C
8, C
9, C
10And inductance L
4, L
5
The frequency modulation amplifying circuit comprises resistance R
10, R
11, R
12, R
13, R
14, R
15, capacitor C
11, C
13, C
15, inductance L
6With triode V
3
The frequency modulation output circuit comprises resistance R
20And capacitor C
12
Power circuit comprises resistance R
16, R
17, R
18, capacitor C
16, C
17, inductance L
7, triode V
4, V
5, diode D
2, voltage-stabiliser tube D
1
Electrostatic discharge protective circuit adopts static to protect device G
1Electrostatic protector G
1Adopt commercially available FESD electrostatic protector.
The capacitor C of amplitude modulation input frequency selection circuit in the electronics electric line
1One termination shield glass aerial signal lead-out terminal, electrostatic protector G
1One end and shield glass aerial signal lead-out terminal and capacitor C
1Link to each other electrostatic protector G
1Other end ground connection.Capacitor C
1The other end and inductance L
1, resistance R
1Link to each other inductance L
1Resistance R
1The other end passes through capacitor C
2With the resistance R in the amplitude modulation amplifier
2, field effect Q
1, Q
2Grid links to each other, field effect transistor Q
1Source electrode connect R
5, capacitor C
3, field effect transistor Q
2Source electrode and capacitor C
4, resistance R
7Link to each other capacitor C
3The other end and capacitor C
4, resistance R
6Link to each other field effect Q
1With field effect transistor Q
2The drain electrode parallel connection after and inductance L
2, resistance R
8Link to each other inductance L
2, resistance R
8The other end and capacitor C
5And the inductance L of power circuit
7, capacitor C
16, C
17Link to each other.
Capacitor C in the amplitude modulation output frequency selection circuit
6Resistance R in one end and the amplitude modulation amplifying circuit
8Inductance L
2Link to each other the other end and inductance L
3, resistance R
9Link to each other inductance L
3, resistance R
9Another termination parallel coaxial-cable signal output part OUT.
Capacitor C in the frequency modulation input frequency selection circuit
7One end passes through capacitor C
1Connect shield glass aerial signal lead-out terminal, capacitor C
7The other end pass through inductance L
4Connect inductance L
5, capacitor C
8, C
9, capacitor C
9Connect capacitor C
10
Biasing resistor R in the frequency modulation amplifying circuit
10, R
11Capacitor C in one end and the frequency modulation input frequency selection circuit
9With triode V
3Base stage connects, resistance R
11The other end passes through resistance R
12, capacitor C
11With triode V
3Collector electrode, inductance L
6Link to each other triode V
3Emitter and resistance R
13Link to each other inductance L
6The other end and resistance R
14, capacitor C
13Link to each other resistance R
14The other end passes through resistance R
15With capacitor C
15And the capacitor C in the power circuit
16, inductance L
7Link to each other.
Resistance R in the frequency modulation output circuit
20Triode V in one end and the frequency modulation amplifying circuit
3Collector electrode, inductance L
6, resistance R
20Link to each other another termination capacitor C
12, capacitor C
12Another termination parallel coaxial-cable signal output part OUT.
In the power circuit, inductance L
7One end and capacitor C
16, C
17Link to each other electric capacity L
7Another termination triode V
4Collector electrode, triode V
4Emitter and triode V
5Emitter, diode D
2Negative pole, resistance R
18Link to each other diode D
2Positive pole connects power supply; Triode V
4Base stage connecting resistance R
16, triode V
5Collector electrode, triode V
5Base stage is passed through resistance R
17With resistance R
18, voltage-stabiliser tube D
1Negative pole links to each other, voltage-stabiliser tube D
1Plus earth.