CN2199604Y

CN2199604Y - High-sensitive omnibearing active aerial

Info

Publication number: CN2199604Y
Application number: CN 94241081
Authority: CN
Inventors: 赵杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-09
Filing date: 1994-08-09
Publication date: 1995-05-31
Anticipated expiration: 2004-08-09

Abstract

The utility model discloses a high-sensitive omnibearing active aerial which is characterized in that two bidirectional aerials are respectively connected with the input end of respective amplifier, the output ends of the two amplifiers are connected in parallel, and the operating frequency ranges of the two amplifiers are identical or partially coincident. The operating frequency ranges of the two aerials are identical or partially coincident, and the two aerials are arranged in a cross mode, so the problem that the existing omnibearing active aerials have the defects of low sensitivity, etc., is solved. The utility model is suitable for TV users to receive TV signals with high sensitivity and omnibearing performance.

Description

High-sensitive omnibearing active aerial

The utility model relates to a kind of active antenna, refers in particular to a kind of comprehensive active tv reception antenna.

The comprehensive active tv antenna of existing simple type (seeing 001 comprehensive active antenna) all be with the two or more oscillators that work in same frequency range are passive be connected to single line output after, send into wide-band amplifier again.Reciprocity according to antenna theory, the oscillator that is not in receive direction will become transmitting antenna, thereby the TV signal loss that the oscillator that is in receive direction is received is a part of, cause antenna gain to reduce (being lower than half-wave dipole), determined the receiving sensitivity of active antenna because of the gain that is in the amplifier in antenna, so the receiving sensitivity of this active antenna obviously descends (being lower than the half-wave dipole active antenna), and to the direction non-selectivity, be subject to co-channel interference, this has also reduced the sensitivity of active antenna.

The purpose of this utility model provides a kind of comprehensive reception that gets final product, and higher receiving sensitivity is arranged again, and can suppress the active antenna of vertical direction co-channel interference.

For achieving the above object, solution of the present utility model is: antenna (1) links to each other with the 1 tunnel amplifier input terminal, and antenna (2) links to each other with the 2 tunnel amplifier input terminal.The 1 tunnel output in parallel with the No. 2 amplifier.The operating frequency range of the No. 1 amplifier and the No. 2 amplifier is identical or partially overlap.The operating frequency range of antenna (1) and antenna (2) is identical or partially overlap, and antenna (1) and antenna (2) intersect placement.

In order to suppress co-channel interference, can a switch will be gone here and there respectively in the power supply circuits of the 1 road and the No. 2 amplifier.In order to realize that the U-V all-channel receives, antenna can be made into the X element antenna of loading.

Because the utility model amplifier in antenna is direct and separately joins, the not outside emittance of antenna is so the gain of antenna itself is apparently higher than common omnidirectional antenna, therefore, the tv signal-noise ratio height of amplifier output, thus the receiving sensitivity that light current is looked signal is significantly improved.Both sides position antenna (1) and both sides position antenna (2) intersect placement, can realize comprehensive reception.The both sides position antenna that the utility model adopts is the X element antenna of loading, can realize that the U-V all-channel receives, have simple in structure, by adorning advantage easily.Because the utility model is respectively gone here and there a switch with the two-way amplifier, that road amplifier that disconnects electricity is not worked, and no signal output is so can suppress the co-channel interference and the noise of this amplifier.

Below in conjunction with embodiment the utility model is further described:

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is a kind of antenna schematic diagram of the present utility model.

Among Fig. 1, antenna (1) links to each other with the high pass filter that C1, C2, L1 form, to remove the interference signal below the 45MHZ, TV signal is sent into IC1(1651 etc. again) etc. the first via Wideband RF Amplifier formed amplify, the TV signal after the amplification is exported behind C4, R2; The signal that antenna (2) is received is through IC3(1651) etc. composition second have a lot of social connections that the band high-frequency amplifier amplifies after C14, R4 output, the signal after two-way amplifies mixes output through feeder line (3) and C10 after R2, R4 mix.C3, C4, C5, C6, C7, C8, C9, C13, C15, C16 are filter capacitor, and R1, R3 are current-limiting resistance, and R2, R4 are isolation resistance, D is a rectifier diode, and IC2 is a circuit of three-terminal voltage-stabilizing integrated 7812, and L2, L3 are high frequency choke coil, B is a transformer, elementary 220V, secondary 17 volts.K is a commutator, can be indoor by common wiring (three) introducing, and by user's control, IC1 work when K gets to a high position, IC3 work during low level; If three wires are connected together, then IC1, IC2 work entirely.

Every oscillator among Fig. 2 all is a same structure, between inner wire (4) and the outer conductor (6) with inductance coil (7) be electrically connected, with insulated tube (5) mechanical fixation, inner wire (4) is fixed on the oscillator insulation board (8), like this, because inductance coil (7) presents high and low impedance respectively to UHF, VHF, so can make the X oscillator work in the U-V all-channel.

The present embodiment parameter is as follows: C1, C2, C3, C4, C4 ', C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 are respectively 47P, 47P, 6800P, 120P, 6800P, 220 μ, 220 μ, 6800P, 6800P, 6800P, 470P, 47P, 47P, 6800P, 120P.R1, R2, R3, R4 are respectively 360 Ω, 75 Ω, 360 Ω, 75 Ω.L1, L2, L3, L4 are respectively 9,20,20,9 circles, and internal coil diameter is 4 millimeters entirely.Diode D is 1N4002.Long 18 centimetres of the inner wire of antenna oscillator (4), outer conductor (6) length is 60 centimetres, coil (7) is 5 circles, 4 millimeters of its internal diameters.

Antenna (1) should intersect mutually with antenna (2) to be placed or vertical placement, receives to realize omnidirectional.Also the antenna (1) and the insulating support of antenna (2) can be made the one of quadrature.

The utility model can have multiple variation, for example: No. one amplifier is the U-V all-channel, and another road amplifier is certain frequency range; Antenna is the U-V all-channel, another antenna be certain frequency range or the like, but these change and all do not depart from essence of the present utility model.

Claims

1, a kind of comprehensive active antenna, power circuit is arranged, antenna (1) links to each other with first via amplifier input terminal, antenna (2) links to each other with the second tunnel amplifier input terminal, the output of the first via and No. the second amplifier is in parallel, it is characterized in that first via amplifier is identical with No. the second amplifier operating frequency range or partially overlap that antenna (1) is identical with antenna (2) frequency range or partially overlap and intersect placement.

2,, it is characterized in that each string has a switch on the power supply circuits of the first via amplifier and No. the second amplifier by the described active antenna of claim 1.

3, by the described active antenna of claim 1, it is characterized in that antenna (1), antenna (2) they all are the X element antennas of loading, all gone here and there inductance coil between the internal and external conductor of every oscillator.