An upper laid aerial device of automobile

An antenna device and top-mounted technology, applied to antennas, devices that enable antennas to work in different bands at the same time, antenna components, etc., can solve problems such as affecting antenna reception, inconvenient use, and easy loss of antenna rods, etc., to achieve structural Compact, easy to use, beautiful appearance design effect

Active Publication Date: 2008-07-09

TAIZHOU SUZHONG ANTENNA GROUP

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AI-Extracted Technical Summary

Problems solved by technology

[0002] At present, the commonly used car antenna is a top-mounted rod antenna. Since the rod antenna is relatively long, installing it on the top of the car will affect the appearance of the whole car.

In addition, common antennas generally have the problem of being easily damaged. The height of the antenna is too high, and it is not convenient to use when washing cars or entering places with limited space.

In addition, dur...

Abstract

A vehicle overhead antenna device of the invention relates to a vehicle receiving antenna of radio signals, which is suitable for being used as a receiving device of the radio broadcasting AM/FM. The structure includes an antenna housing, an antenna bracket, a radio receiving antenna, an antenna amplifier, a metal mounting base and a wireless signal output coaxial cable; the radio receiving antenna is arranged on the antenna bracket, the antenna bracket is arranged on the metal mounting base, one end of the radio receiving antenna is provided with an antenna signal output end, the antenna signal output end is connected with a signal input end of the antenna amplifier, a circuit board of the antenna amplifier is arranged on the metal mounting base, a signal output end of the antenna amplifier is connected with the radio receiving device by the antenna signal output coaxial cable, the antenna housing is arranged at the outside of the antenna bracket and is fixed on the metal mounting base; the antenna amplifier includes an AM frequency selection circuit, an AM signal amplification circuit, an FM frequency selection circuit, an FM signal amplification circuit, a power circuit and a wave trapping circuit.

Application Domain

Simultaneous aerial operationsHigh frequency amplifiers +6

Technology Topic

Radio broadcasting stationRadio reception +8

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Examples

Experimental program(1)

Example Embodiment

[0024] 1 to 4, the structure of the car overhead antenna device includes an antenna housing 1, an antenna bracket 3, a radio receiving antenna 2, an antenna amplifier 4, a metal mounting base 6, and a wireless signal output coaxial cable 7. The radio receiving antenna 2 is mounted on the antenna support 3, and the antenna support 3 is mounted on the metal mounting base plate 6. The radio receiving antenna 2 is an AM/FM shared antenna, and the radio receiving antenna 2 uses a metal spiral antenna, and its resonance frequency is 98±3MHz. One end of the radio receiving antenna 2 is provided with an antenna signal output terminal. The antenna signal output terminal of the radio receiving antenna 2 is connected to the signal input terminal of the antenna amplifier through the connecting wire 5. The circuit board of the antenna amplifier 4 is mounted on the metal mounting base 6 and the antenna amplifier signal The output end is connected to the radio receiving device through the antenna signal output coaxial cable 7. The antenna housing 1 is installed outside the antenna bracket 3 and fixed on the metal mounting base 6.

[0025] The antenna amplifier includes AM frequency selection circuit, AM signal amplification circuit, FM frequency selection circuit, FM signal amplification circuit, power supply circuit, and wave blocking circuit. The AM/FM signal output terminal of the radio receiving antenna is connected to the AM frequency selection circuit and the FM selection circuit at the same time. The AM frequency selection circuit is connected to the AM signal amplification circuit, the FM frequency selection circuit is connected to the FM signal amplification circuit, and the AM signal amplification circuit is connected to the FM signal. The signal output end of the signal amplifier circuit is connected to the common output plug, the ground end of the output plug is connected to the ground end of the antenna amplifier, one end of the choke circuit is connected to the ground end of the antenna amplifier, and the other end of the choke circuit is connected to the metal mounting base. The mounting base is fixed on the car shell when in use. The power circuit provides power for the antenna amplifier. The antenna shell is configured as a shark fin shell.

[0026] The AM frequency selection circuit includes a capacitor C1, an inductor L1, L2, and a resistor R1.

[0027] The AM signal amplifier circuit includes a field effect tube V1, a triode V2, resistors R2 to R7, capacitors C2 to C5, and an inductor L3. The field effect tube V1 uses MMBFJ310 field effect tube.

[0028] The FM frequency selection circuit includes capacitors C6 to C9, inductors L4 and L5.

[0029] The FM signal amplifying circuit includes a transistor V3, resistors R8 to R13, capacitors C10 to C13, and inductor L6.

[0030] The power circuit includes dual diodes D1, capacitors C14, C15, and inductor L7. Double diode D1 uses 1SS226 double diode. The DC power supply is connected to the power supply circuit through a wire 8.

[0031] The wave blocking circuit uses a printed inductor L0.

[0032] In the antenna amplifier circuit, the inductance L2 of the AM frequency selection circuit is connected in parallel with the resistance R1, and one end is connected to the inductor L1, and the other end is connected to the gate of the field effect tube V1 in the AM signal amplifier circuit. The source of the field effect tube V1 is connected to C2. R4 and R7 are connected, the drain of FET V1 is connected to resistors R5, R6, and capacitor C3. The other end of resistor R6 and capacitor C3 is connected to the base of transistor V2. The collector of transistor V2 is connected to capacitor C4 and resistor R7. , The emitter of the transistor V2 is connected to the inductor L7 and the capacitor C15 of the power supply circuit. The capacitor C4 is connected to the double diode D1 through the common output plug OUT of the inductor L3.

[0033] The antenna TX is connected to the capacitor C6 in the FM frequency selection circuit through the capacitor C1, and is also connected to the inductor L1 in the AM frequency selection circuit, and the antenna TX is connected to the electrostatic protector BL1.

[0034] One end of the inductor L4 in the FM frequency selection circuit is connected to the capacitor C6, the other end is connected to the inductor L5, capacitors C7, and C8. The other end of the capacitor C8 is connected to the capacitor C9, the resistor R8, the resistor R9 and the base of the FM signal amplifier circuit transistor V3. The resistor R10 is connected in parallel with the capacitor C10, one end is connected to the base of the transistor through the resistor R9, the other end is connected to the collector of the transistor V3, the emitter of the transistor V3 is connected to the resistor R11, the capacitor C11, and the collector of the transistor V3 is connected to the common output plug OUT through the capacitor C12 One end of the inductor L6 is connected to the collector of the transistor V3, the other end of the inductor L6 is connected to the capacitors C14, C15, and the inductor L7 of the power circuit through resistors R12 and R13, and the other end of the inductor L7 is connected to the cathode of the double diode D1.

[0035] One end of the printed inductance L0 of the choke circuit is connected to the ground of the antenna amplifier printed circuit board, and the other end is connected to the metal mounting board. The printed inductance L0 is an inductance made with printed circuits on a printed circuit board.

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Classification and recommendation of technical efficacy words

reasonable design
compact structure

An upper laid aerial device of automobile

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

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Description & Claims & Application Information

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