CN2202975Y

CN2202975Y - Fequency-modulation dipole plate antenna

Info

Publication number: CN2202975Y
Application number: CN 94217720
Authority: CN
Inventors: 潘家任; 周国材; 周正国
Original assignee: GUANGTIAN BROADCASTING AND TV
Current assignee: GUANGTIAN BROADCASTING AND TV
Priority date: 1994-07-29
Filing date: 1994-07-29
Publication date: 1995-07-05
Anticipated expiration: 2004-07-29

Abstract

The utility model relates to a frequency modulation dipole plate antenna, which is composed of two pairs of half-wave vibrators, two pairs of inclined struts and a metallic reflecting plate, wherein, each pair of half-wave vibrators forms a dipole, and two dipoles are arranged in parallel and fixed on the reflecting plate through the inclined struts. The utility model which is used for the transmission of frequency modulation signals has the characteristics of firm and light structure, favorable sealing performance and wide wavelength band of the antenna.

Description

Fequency-modulation dipole plate antenna

The utility model relates to a kind of frequency-modulated antenna, particularly frequency modulation quadripole daughter board antenna.

Along with developing rapidly of China's FM broadcasting cause, requirement to antenna is more and more higher, in general, require FM broadcasting antenna and television antenna tower altogether, the shared one pair of antenna of many cover FM broadcasting programs broadcasts, because antenna need be installed in the top of television tower, be subjected to the influence and the long-term test of using of various adverse circumstances, so require antenna that firmly light and handy structure and good air-tightness arranged, therefore pyramid, dicyclo, back of the body chamber, the batwing antenna of existing use can not satisfy above-mentioned requirements.

The purpose of this utility model provides a kind of frequency modulation quadripole daughter board antenna, and it can use in meteorological rugged environment for a long time, is convenient to install Yu Yita concentratedly with television antenna.

The utility model comprises two pairs of half-wave dipoles, two pairs of diagonal braces and a metallic reflection plate; Every pair of half-wave dipole that is on the same axis constitutes a dipole, two dipoles of two pairs of half-wave dipole formations be arranged in parallel, two pairs of half-wave dipoles fix by diagonal brace affixed with it and metallic reflection plate respectively, and two pairs of diagonal braces intersect at metallic reflection plate place; A short circuit card movably up and down is installed between two arms of every pair of diagonal brace, is provided with inner wire in diagonal brace and half-wave dipole inside and joins with input.

For mechanical strength, stability and the sealing property that strengthens antenna, also fix a work vinyl cover at every pair of half-wave dipole centre feed head place.

The utility model is compared with existing frequency-modulated antenna, sound construction, light and handy, good airproof performance can guarantee that antenna works in the meteorological condition rugged environment, the antenna wide waveband, can adapt to various installation requirements, can the multiplex (MUX) use, can multiple layer combination, can bear high-power user's requirement, be convenient to install Yu Yita concentratedly with television antenna.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an equivalent circuit diagram of the present utility model;

Fig. 3 is an outside drawing of the present utility model.

Below in conjunction with accompanying drawing the utility model is further described.

The utility model comprises 1, two pair of half-wave dipole 2 of a metallic plate reflecting plate and two pairs of diagonal braces 3.Every pair of half-wave dipole 2 that is on the same axis constitutes a dipole, and such two pairs of half-wave dipoles 2 have just constituted two dipoles, and two dipoles be arranged in parallel.Two pairs of half-wave dipoles 2 are fixedly connected by diagonal brace affixed with it 3 and reflecting plate 1 respectively, two pairs of diagonal braces 3 intersect at the reflecting plate place, and a short circuit card 4 movably up and down is installed between two arms 31 of every pair of diagonal brace 3, be provided with inner wire 5 at diagonal brace and half-wave dipole inside, establish inner wire 5 and join by input socket 6 and transmitter.Metallic reflection plate 1 of the present utility model is latticed, about 5 square metres of area.

Fig. 2 shows equivalent circuit diagram of the present utility model, Z in the drawings _ABe shape, size, the operating frequency of antenna feed impedance, it and dipole, and factor such as surrounding environment (as the distance from reflecting plate, apart from the distance of closing on dipole etc.) is relevant, changes one of them impedance to change thereupon; Z _L1Be parallel arm induction reactance, it is caused by the diagonal brace that supports dipole, and its numerical value is by the diameter of diagonal brace 3, the determining positions of spacing and short circuit card.Z _L2, Z _C1Be respectively series arm induction reactance and capacitive reactance length decision by inner wire 5.Z _C2Parallel arm capacitive reactance for input is formed by the dipole end, and its numerical value is by the distance between the shape of dipole, size, dipole, middle factors such as medium decision.By changing Z _A, Z _L1, Z _L2, Z _C1, Z _C2Numerical value, the reactance major part of input is cancelled, making the voltage standing wave ratio of antenna input of the present utility model is S≤1.2 at whole fm band.

Claims

1, a kind of frequency modulation quadripole daughter board antenna is characterized in that: comprise two pairs of half-wave dipoles, two pairs of diagonal braces and a metallic reflection plate; Every pair of half-wave dipole that is on the same axis constitutes a dipole, and two dipoles of two pairs of half-wave dipole formations be arranged in parallel, and two pairs of half-wave dipoles fix by diagonal brace affixed with it and metallic reflection plate respectively; Two pairs of diagonal braces intersect at metallic reflection plate place; A short circuit card movably up and down is installed between two arms of every pair of diagonal brace, is provided with inner wire in diagonal brace and half-wave dipole inside and joins with input.