CN201153152Y

CN201153152Y - Improved gap feeding yagi antenna

Info

Publication number: CN201153152Y
Application number: CNU2008200917580U
Authority: CN
Inventors: 董政; 吴进波; 刑章红
Original assignee: Shenzhen Guoren Communication Co Ltd
Current assignee: Shenzhen Guoren Communication Co Ltd
Priority date: 2008-01-22
Filing date: 2008-01-22
Publication date: 2008-11-19
Anticipated expiration: 2018-01-22

Abstract

An improved slot feed Yagi antenna comprises a cable, a reflecting element, an active dipole and at least one director element, wherein, the active dipole is a half-wave dipole, and a feed part of the Yagi antenna is of a slot structure which is shielded; the slot structure which is shielded is a metal post body which is arranged in a supporting tube and provided with a through slot in the middle, and the length of metal post body is equal to a quarter of the wavelength of the central frequency of a working frequency band; the supporting tube is integrated with the metal post body into a whole; the shape of the slot is a straight line or an S shape or an arcuate slot. The improved slot feed Yagi antenna abandons a folded dipole which is usually used by the Yagi antenna, but uses the half-wave dipole as the active dipole of the Yagi antenna; the feed is realized by the slot; through a simulated exam and test, under the same size condition, the improved slot feed Yagi antenna can provide a gain and a front-to-rear ratio which is better than the gain and the front-to-rear ratio of the folded dipole, thereby saving the production cost and reducing the occupied space of the antenna on the premise of ensuring the gain and the front-to-rear ratio.

Description

A kind of improved cutler feed Yagi antenna

[technical field]

The utility model relates to the communications field, especially relates to a kind of Yagi antenna with new feed structure in the microwave communication field.

[background technology]

Yagi antenna is cited approvingly again to antenna, is widely used in that metric wave is communicated by letter with decimeter wave, in radar, TV and other radiotechnics equipment.Yagi antenna is made up of active dipole, reflector and some director elements usually, and reflector and director element all are the short circuit parasitic elements, and the perfect condition of all oscillators all is to be arranged in the plane, and parallel to each other and center point-blank.The greatest irradiation direction of Yagi antenna is pointed to the direction of director dipole in comprising the plane of antenna axis.

In the modern life, engineering, Yagi antenna version is diversified, is feed structure, reflector and active dipole and change maximum, and wherein most critical is the variation of active dipole; Modal active dipole is half-wave doublet and half-wave folded dipole, half-wave doublet is because the restriction of direct impedance characteristic, impedance transformation and antenna structure are not easy to realize, therefore more are with the active dipole of half-wave folded dipole as Yagi antenna on the engineering antenna.With the Yagi antenna of half-wave folded dipole as active dipole, its feed structure mainly is a self structure of utilizing Yagi antenna, as succinct through type feed method, cable is penetrated by stay pipe, bend pipe by folded dipole strides across distributing point and the inner wire of cable is received on the folded dipole on opposite, because structural limitations, if need higher gain and front and back ratio, then this kind Yagi antenna need accomplish enough big, increase such as cause production cost, take up room.

[utility model content]

The utility model is intended to overcome the defective of above-mentioned prior art, a kind of Yagi antenna with new feed structure is provided, its structure can also provide gain and the front and back ratio that is better than the folded dipole Yagi antenna under same size condition when realizing the Yagi antenna feed.

For achieving the above object, technical scheme provided by the utility model is:

A kind of improved cutler feed Yagi antenna, comprise cable, reflector, active dipole and at least one director element, wherein reflector, active dipole and director element are risen by stay pipe one end in regular turn and arrange out, described active dipole is a half-wave dipole, and the current feed department of this Yagi antenna is divided into the gap structure of conductively-closed.

Feed structure of the present utility model is the gap structure of conductively-closed, and the Yagi antenna with this structure under same size condition, can provide the gain, the front and back ratio that are better than the folded dipole Yagi antenna through simulation test and test.

Further, the gap structure of conductively-closed described in the utility model is to be built in the metal cartridge that stay pipe and middle part have penetrating slit, and the length of described metal cartridge is the quarter-wave of working frequency range centre frequency.

This kind gap structure by the excitation to nearly quarter-wave slit, thereby is realized the feed process of the excitation realization Yagi antenna of Yagi antenna active dipole is realized the Yagi antenna radiation function.

Further, described stay pipe and metal cartridge all are structure as a whole, and this kind structure can make the Yagi antenna overall structure simple, compact.

Further, an end closure of described metal cartridge, the other end disconnects, and locatees to metal column with back-up block at described gap.

Further, described active dipole is made of two sections thin metal bars that are connected both sides, stay pipe slit, and described metal cartridge both sides correspondence position leaves the hole that thin metal bar is installed.

Further, be filled with dielectric in the described slit, can change the transmission speed of electric wave, thereby can reduce the length in slit; Satisfying under the nearly quarter-wave condition in slit simultaneously, difform variation can be done in described slit, can be rectilinear slot, or S shape slit, or arc slit.

The utility model is abandoned Yagi antenna folded dipole commonly used, and with the active dipole of half-wave dipole as Yagi antenna, feed is realized by the slit, through simulation test and test, under same size condition, the gain, the front and back ratio that are better than folded dipole can be provided, thereby under the precondition that guarantees gain, front and back ratio, save production cost, reduced antenna and take up room.

[description of drawings]

Fig. 1 is the installation diagram of the utility model embodiment;

Fig. 2 is an exploded view shown in Figure 1;

Fig. 3 is the structure chart of metal cartridge shown in Figure 2.

[embodiment]

The purpose of this utility model is to provide a kind of Yagi antenna with new feed structure, and its structure can under same size condition, can also provide the gain, the front and back ratio that are better than folded dipole when realizing the Yagi antenna feed.

Below in conjunction with specific embodiment and accompanying drawing in detail the utility model is described in detail.

Fig. 1-3 is the relevant view of the utility model embodiment, as shown in Figure 1, the Yagi antenna of a kind of cutler feed that the utility model provides, comprise cable 1, reflector 2, active dipole 3 and at least one director element 4 these four groundwork unit, wherein reflector 2, active dipole 3 and director element 4 are arranged out by an end of stay pipe 5 in regular turn, described active dipole 3 is a half-wave dipole, and the current feed department of this Yagi antenna is divided into the gap structure of conductively-closed.In this Yagi antenna, the parameter of each working cell is consistent with common Yagi antenna parameter, and 1/2nd wavelength slightly are longer than in reflector 2, active dipole 3 nearly 1/2nd wavelength, director element 4 slightly is shorter than 1/2nd wavelength, and each working cell spacing slightly is shorter than quarter-wave.

In the present embodiment, as shown in Figure 2, the reflector 2 of Yagi antenna, director element 4 are thin metal pipe, and active dipole 3 is thin metal bar, relevant position at stay pipe 5 all is provided with preformed hole, reflector 2, active dipole 3, director element 4 is fixed on the stay pipe 5 with screw by preformed hole.The gap structure of Yagi antenna conductively-closed is to constitute by being built in the metal cartridge 6 that stay pipe 5 and middle part have a penetrating slit 7, the length of described metal cartridge 6 is the quarter-wave of working frequency range centre frequency, one end closure of described metal cartridge 6, the other end disconnects, give metal cartridge 6 location at described gap with back-up block 8, back-up block 8 is slightly larger than the size of metal cartridge 6, and equal the size of stay pipe 5 inwalls, this size makes metal cartridge 6 be suspended on the inwall of stay pipe, does not contact with stay pipe 5.Described metal cartridge 6 both sides are provided with the hole 9 of installing for active dipole 3, and 9 places, hole are provided with waterproof gasket 10, and described metal cartridge 6 is provided with the groove 11 that passes for reflector 2.Described stay pipe 5 all is structure as a whole with metal cartridge 6, makes the Yagi antenna overall structure simple, compact.

In said structure, the nearly quarter-wave of the length in described slit 7, a face down bonding in slit 7 connects the inner wire of cable 1, the outer conductor of opposite side welding cable 1; The inner wire of described cable 1 directly contacts with slit 7, directly the slit is encouraged, and then realizes the feed process of Yagi antenna.

In the present embodiment, be filled with dielectric in the described slit 7,, can dwindle the length in slit after the filling as the polyethylene in the plastics; Satisfying under the 7 nearly quarter-wave conditions of slit, difform variation can be done in described slit 7, can be rectilinear slot as shown in the figure, also can be S shape slit, or arc slit, or the slit of other analogous shapes.

In above-mentioned specific embodiment, the gap structure of this conductively-closed, by the excitation to this nearly quarter-wave slit, thereby the feed process of realization Yagi antenna realizes the Yagi antenna radiation function.Have the Yagi antenna process simulation test and the test of the gap structure of this conductively-closed, under same size condition, can provide the gain, the front and back ratio that are better than folded dipole.

Above-described only is the utility model preferred implementation, and it describes comparatively concrete and detailed, can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection range of the present utility model.

Claims

1, a kind of improved cutler feed Yagi antenna, comprise cable, reflector, active dipole and at least one director element, wherein reflector, active dipole and director element are risen by stay pipe one end in regular turn and arrange out, described active dipole is a half-wave dipole, it is characterized in that: the current feed department of this Yagi antenna is divided into the gap structure of conductively-closed.

2, a kind of improved cutler feed Yagi antenna according to claim 1, it is characterized in that: the gap structure of described conductively-closed is to be built in the metal cartridge that stay pipe and middle part have penetrating slit, and the length of described metal cartridge is the quarter-wave of working frequency range centre frequency.

3, a kind of improved cutler feed Yagi antenna according to claim 2, it is characterized in that: described stay pipe and metal cartridge all are structure as a whole.

4, a kind of improved cutler feed Yagi antenna according to claim 2 is characterized in that: an end closure of described metal cartridge, the other end disconnects, and locatees to metal cartridge with back-up block at described gap.

5, a kind of improved cutler feed Yagi antenna according to claim 1, it is characterized in that: described active dipole is made of two sections thin metal bars that are connected both sides, stay pipe slit, and described metal cartridge both sides correspondence position leaves the hole that thin metal bar is installed.

6, a kind of improved cutler feed Yagi antenna according to claim 2 is characterized in that: be filled with dielectric in the described slit.

7, a kind of improved cutler feed Yagi antenna according to claim 6, it is characterized in that: described slit is a rectilinear slot, or S shape slit, or arc slit.