CN2200232Y

CN2200232Y - Short wave wide-band centre-fed emission aerial

Info

Publication number: CN2200232Y
Application number: CN 94222197
Authority: CN
Inventors: 俱新德; 董玉良; 张建民
Original assignee: Xidian University
Current assignee: Xidian University
Priority date: 1994-09-24
Filing date: 1994-09-24
Publication date: 1995-06-07
Anticipated expiration: 2004-09-24

Abstract

The utility model relates to a short wave broadband intermediate feed sending antenna which mainly solves the problems that the existing whip antenna has low efficiency and can not adapt for the requirement for fast frequency hopping in short wave frequency hopping radio stations. The utility model adopts a structure that cone-shaped metal frames are additionally arranged on an upper radiator and a lower radiator of the existing whip intermediate feed antenna. Each of the cone-shaped metal frames is composed of a plurality of metal rods, and the cone angle of each cone-shaped metal frame is upward or downward. Experiments prove that the antenna (with the height of 13 m) of the utility model can basically cover the entire short wave band of 3 to 30 MHz. The voltage standing wave ratio of the antenna (except for individual frequency points) is smaller than or equal to 3.0, and the problem that the short wave broadband intermediate feed sending antenna is incapable of earthing is solved. The utility model has the advantages of wide frequency bands, low voltage standing wave ratio, high radiation efficiency, etc. The utility model can be widely used as sending antennas and receiving antennas for short wave radio stations, short wave broadband frequency hopping and band spreading radio stations.

Description

Short wave wide-band centre-fed emission aerial

The utility model relates to the antenna class, particularly a kind of short wave bandwidth transmitting antenna.

Along with modern communication technology, especially military communication technology rapid development, the continuous appearance in shortwave and ultrashort wave wide interval frequency hopping radio station, press for can volume matching used little with it, the efficient height, voltage standing wave(VSW) is smaller, and antenna itself and antenna matching network do not need to adjust and tuning broad-band antenna.A kind of communication whip antenna that domestic 932053769 patents provide, though can satisfy the requirement of this broad-band antenna, but have following deficiency: the one since coaxial line with the junction, bottom of antenna, the crust of its coaxial line will be through could ground connection after 5 meters to the 10 meters long cables, thereby be not easy to the use of some emission use occasion (as carrier-borne); The 2nd, because will cover whole 3～30MHz short-wave band, need to use two hf wideband antennas, thereby make troubles to the user; The 3rd, if in 3～9MHz band, reach standing-wave ratio VSMR≤2.0, then the geometric height of antenna must be up to 20 meters about, so Yin Taigao inconvenience use on carrier-borne.

The purpose of this utility model is to avoid the deficiency of above-mentioned existing antenna, provides a kind of height not high, presents transmitting antenna but can cover in the taper metal frame short wave bandwidth of whole short-wave band.

The technical scheme that realizes the purpose of this utility model is on the basis of existing communication whip antenna, additional 2～3 taper metal frame.With the broadband of further broadening antenna, reduce the electrical height of antenna in lowest operating frequency, effectively solve the antenna effect problem of coaxial feeder.Entire antenna includes radiant body, following radiant body, taper metal frame, broadband impedance matching network, coaxial cable and metal chokes cover.Wherein the taper metal frame lays respectively at down top, bottom or the middle suitable position of radiant body, and the wideband impedance match network is positioned at the junction of radiant body, i.e. distributing point up and down.

Below provide of the present utility model illustrating and embodiment

Fig. 1 is the first example structure figure of the present utility model

Fig. 2 is the second example structure figure of the present utility model

Fig. 3 is the 3rd example structure figure of the present utility model

With reference to Fig. 1, added a cone angle respectively on the bottom of last radiant body 1 and the top of following radiant body 9 (being the two ends of Antenna Impedance Matching network) and made progress and the downward

taper metal frame

6 and 7 of cone angle.Radiant body links together to constitute the distributing point of antenna by wideband impedance match network 2 up and down.Taper metal frame 6 is to be that 20 degree, length are that three or four Metallic rod of 2.5 meters, 3.6 meters constitute by cone angle, and welding taper metal frame 7 is to be made of three downward plain conductors of cone angle.The upper end of plain conductor is connected with the top of following radiant body 9, and the lower end of plain conductor is ground connection respectively, and this ground connection place bores the maximum of metal frame 7 directly through locating for the garden.One end of coaxial feeder 3 is connected with matching network 2, and an end joins with the coaxial line socket 5 that is fixed on the insulation board 4.

Second embodiment shown in Figure 2, be on the basis of Fig. 1 first embodiment, set up a taper metal frame 8 that cone angle makes progress again in the centre position of last width of cloth beam 1 according to different needs, this taper metal frame 8 also be by three or four long be 2～3 meters Metallic rod be fixed on connector 10 on the radiant body 1 and join and constitute.

The 3rd embodiment shown in Figure 3 is mainly used in the occasion that does not have condition ground connection or inconvenient ground connection.The first half of this antenna is identical with antenna shown in Figure 1, and it is with metal tube 12 in outside of radiant body 9 down, and the lower end of metal tube 12 is with the bottom welding of radiant body 9 down, and upper end open plays a part full chokes cover.Lossy bigger magnet ring also can be overlapped in the outside of following radiant body 9, to control the influence of cable sheath electric current.Also can fill the loss material in the space between metal tube 12 and the following radiant body 9, to reduce the influence of the excessive electric current of coaxial outer conductor.The additional taper metal chokes cover in the top of following radiant body 9 11 is made of three Metallic rod, and an end links to each other with the outer conductor of coaxial cable 3, other end open circuit, both as under the part of radiant body, double as broadband metal chokes cover again.

The utility model is being owing to up and down adding garden awl metal frame on the radiant body, the equivalent aerial overstriking, so broadening the impedance bandwidth of antenna, reduced the electrical height of antenna when lowest operating frequency; Particularly descend the terminal ground connection of taper metal frame additional on the radiant body, existing middle feedback broadband whip antenna coaxial feeder and antenna effect have been eliminated effectively, fundamentally solved existing in the direct ground connection of outer conductor of feedback broadband whip antenna coaxial feeder, and will be through the problem of ability ground connection after 510 meters length.Owing to the taper metal frame of on following radiant body, setting up, not only can be used as down the part of radiant body simultaneously, the effect that has fixed antenna concurrently, strengthens the antenna mechanical strength is arranged again; In addition owing to do not having to have adopted top additional earth-free under condition ground connection or the inconvenient ground connection situation at following radiant body; In addition owing to do not belong to the chokes cover having to have adopted under condition ground connection or the inconvenient ground connection situation at additional earth-free garden, the top awl expense of non-staple food of radiant body down, and on following radiant body, be with metal tube 12 or, controlled the electric current on the coaxial cable outer conductor effectively being with magnet ring on the coaxial outer conductor or between metal tube and coaxial outer conductor, filling the structure of consumable material.Experiment shows, the utility model is in voltage standing wave ratio VSWR≤3 o'clock, its bandwidth becomes 9.5:1 by original 4.3:1, antenna is reduced to 0.1 at the electrical height of lowest operating frequency by original 0.16, just can cover whole short-wave band with 13 meters high hf wideband antennas, be a kind of desirable practical short wave bandwidth transmitting antenna.

Claims

1, a kind of short wave bandwidth center-fed antenna, comprise radiant body (1), following radiant body (9), broadband impedance matching network (2) and coaxial cable (3), it is characterized in that having additional taper metal frame (6) in the radiation (1), have additional taper metal frame (7) or taper metal chokes covers (11) on the following radiant body (9).

2, antenna according to claim 1, it is characterized in that taper metal frame (7) is connected down the top of radiant body (9), taper metal frame (6) is connected the bottom of radiant body (1), and the middle part of last radiant body (1) also can add taper metal frame (8).

3, antenna according to claim 1 and 2 is characterized in that the taper metal frame is made up of many Metallic rod or metal wire, and cone angle up or down.

4, antenna according to claim 1 is characterized in that the lower end of radiant body (9) links to each other with the outer conductor of coaxial cable (3) and ground connection with coaxial cable down, and the terminal each point of taper metal frame (7) is ground connection respectively.

5, antenna according to claim 1 is characterized in that an end of taper metal chokes covers (11) links to each other the other end beginning with the outer conductor of coaxial cable (3).

6, antenna according to claim 1, it is characterized in that the outside of radiant body (9) also can be with metal tube (12) down, the lower end ground connection of metal tube (12), upper end open, the outer wall of following radiation (9) also can be overlapped upper magnetic ring or filled consumable material between radiation (9) and the metal tube (12) down.