CN2074060U - High-gain omnidirectional antenna for ultra-high frequency band - Google Patents

Abstract

The utility model discloses a high-gain omni-directional antenna for an ultra-high frequency band, composed of a radio frequency cable, a brass pipe, a glass pipe, etc.; a plurality of lambada g/2 long cables with same frequencies are connected with each other crossly to form two modes of transmitting and radiating, which makes that the voltage amplitude of the connecting points of each line segment is equal, phase is same, and driving power sizes are also same. The utility model has the advantages of simple structure, high gain, small standing-wave ratio, light weight, short length (can be folded), convenient carrying, a good performance price, etc.

Description

High-gain omnidirectional antenna for ultra-high frequency band

The utility model belongs to the improvement of the high-gain omni-directional antenna of hyperfrequency frequency range.

At present, be used for the high-gain aerial of hyperfrequency frequency range both at home and abroad, have two kinds substantially: a kind of is the 900MHZ antenna that China Guangdong San Shui southwest Telecommunications Equipment Plant produces, and a kind of is the T-924 antenna that the Japanese first electric wave Industrial Co., Ltd produces.Two kinds of antennas all can accomplish that gain is 12.5dB in 898 to 910MHZ passband scope, standing-wave ratio is not more than 1.5, is applicable to the supporting use in frequency range radio station.But, the former reach 4 meters surplus, weigh more than 20 jin, the structure heaviness should not be carried and install; Though the latter has simple in structure, the energy folding carries with easy for installation, and it costs an arm and a leg, and raw material source difficulty is not easy to promote the use of in China.

The purpose of this utility model overcomes the deficiency of existing antenna exactly, and designs voluntarily and the foldable formula omnidirectional antenna of making of the high-gain that is used for the hyperfrequency frequency range.

Formation of the present utility model can illustrate by Fig. 1 and Fig. 2, and wherein Fig. 1 is the utility model internal structure schematic diagram, and Fig. 2 is the utility model surface schematic diagram.From two figure as can be seen: the utility model mainly is made of radio frequency cable, brass tube, glass tube and socket screws, nut.Concrete structure is radio frequency cable (1), and length is 110 ± 2.5mm, 1 brass tube (2), and length is 110 ± 2.5mm, 1 joint, brass tube (3), length is 105 ± 2.5mmmm, 1 joint, brass tube (5), length are 107 ± 2.5mm, totally 22 save brass tube (4), length is 57 ± 3.0mm, 1 joint, radio frequency cable (6), length is 107 ± 2.5mm, 1, and socket (7), 1, axle sleeve (8), 1, post (9), 1, following joint glass tube (10), 1, screw (11), 1, last joint glass tube (12), 1, nut (13), 1, cap (14), 1.The internal orifice dimension of all brass tubes is φ 4.30 ± 1.0mm, and wall thickness is 0.25 ± 0.1mm.And the radio frequency cable that equates with pipe range is housed all in the brass tube.

The utility model is a kind of antenna that sets up perpendicular to ground, i.e. vertical type conllinear array antenna.The upright antenna normalization of its former reason directivity function:

F（△）＝ (Cos（βhSinΔ）－Cos（βh）)/(（1－Cos（βh））CosΔ)

Here △ is an antenna elevation angle, and h is the upright antenna height of one pole.When △=zero, F(△)=1, as can be known, the directional diagram of horizontal plane is a garden, that is to say, this antenna is an omnidirectional antenna.

Fig. 1 and Fig. 2 also can find out, antenna is by the long coaxial cable interconnection of plurality of sections λ g/2, the inner wire that is about to one section cable is connected with inner wire with the outer conductor of another section cable across with outer conductor, utilize interconnection to reach the purpose of paraphase, owing to cross-coupled noncontinuity has formed radiation, make structure of the present utility model have transmission mode and two kinds of patterns of radiation mode like this.Electric wave transmits to the antenna top along the inner wire of transmission line and the inner surface of outer conductor, every distance through λ g/2, voltage direction counter-rotating (180 ° of phase phasic differences) is because interconnection, again the direction of voltage is reversed, so the voltage on the respective point of each line segment is identical.This voltage is connected across on the gap of two adjacent coaxial line segments handing-over simultaneously, and the outer surface excitation of the outer conductor of cable is formed radiation.So the utility model is again the upright antenna of multiple spot excitation,, so, can prove that equally the power of each contact excitation of antenna equates that its voltage is constant amplitude if cable is not have consumption.

Fig. 1 and Fig. 2 also are embodiments of the present utility model.By the antenna that above-mentioned specification manufactures, its passband is 898-910MHZ, and antenna gain is 12.5d β, standing-wave ratio is not more than 1.5, foldable, folding is long only 1.7 meters, 3 jin of shortages in weight, carry and install all very convenient, simple in structure, beautiful design, performance and price is relatively good, being used for result of use behind the frequency range radio station goodly especially, is a kind of desirable high-gain omni-directional antenna that is used for the hyperfrequency frequency range.

Claims (2)

1, a kind of high-gain omni-directional antenna of hyperfrequency frequency range, form by radio frequency cable, brass tube and glass tube, it is characterized in that described brass tube endoporus aperture is φ 4.30+1.0mm, the brass tube wall thickness is 0.25 ± 0.1mm, long 110 ± the 2.5mm of brass tube (2), long 105 ± the 2.5mm of brass tube (3), the long 107 ± 2.5mm of brass tube (5), the long 57 ± 3.0mm of brass tube (4).

2, according to the described antenna of claim 1, it is characterized in that brass tube (2), (3), (4) are 1 joint, brass tube (5) is 22 joints.

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