CN101908670A

CN101908670A - Tri-branch multi-frequency plane dipole antenna

Info

Publication number: CN101908670A
Application number: CN201010212850XA
Authority: CN
Inventors: 康来利
Original assignee: Suzhou Wutong Antenna Co Ltd
Current assignee: Suzhou Wutong Antenna Co Ltd
Priority date: 2010-06-30
Filing date: 2010-06-30
Publication date: 2010-12-08

Abstract

The invention discloses a tri-branch multi-frequency plane dipole antenna, comprising a shell, a first branch, a second branch, a third branch, a copper exposure zone and a feed source, wherein the first branch, the second branch and the third branch are respectively connected with corresponding circuits. In particular, the first branch, the second branch and the third branch are laminated structures connected with each other in the same one plane, wherein the first branch and the second branch are symmetrically arranged at both sides of the third branch; the first branch and the second branch are jointly combined far away from one end of the third branch and are connected with the copper exposure zone at the lower end of a public area into a whole; the feed source is inserted between the first branch and the second branch and communicated with the third branch at the upper end of the copper exposure zone; and the third branch is a gradually widening structure back on to the copper exposure zone. The plane dipole antenna structure also has the advantages of small size, remarkable anti-vibration effect and excellent wireless communication performance; and therefore, the tri-branch multi-frequency plane dipole antenna can be widely applicable to 3G (The 3rd Generation Telecommunication) wireless terminal products of a CDMA2000 (Code Division Multiple Access 2000) system, a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system, a WCDMA (Wideband Code Division Multiple Access) system, and the like.

Description

Tri-branch multi-frequency plane dipole antenna

Technical field

The present invention relates to a kind of dipole antenna, relate in particular to a kind of tri-branch multi-frequency dipole antenna of planar structure, belong to the wireless communication technique field.

Background technology

In existing wireless communication technology, traditional antenna three branched structure complexity, Insertion Loss and shockproof effect are poor, are difficult to satisfy the 3G epoch low cost, miniaturization, low Insertion Loss, the high shockproof requirement that have arrived.

Prior art antenna structure view as shown in Figure 1: as seen this traditional antenna comprises first branch 1, second branch 2, the 3rd branch 3, dew copper district 4 and the feed 5 under housing (not shown) and the housing coating.Wherein first branch 1 with reveal that copper district 4 fuses, second branch 2 fuses with feed 5, respectively is provided with circuit (being mature technology, so do not give unnecessary details at this) in first branch 1, second branch 2, wherein feed 5 is connected with circuit in second branch 2; Revealing copper district 4 is connected with circuit in first branch 1.From the space, the 3mm place is parallel above the copper district 4 passes this feed 5 revealing, and can receive the radio signal from the outside; The 3rd branch 3 is arranged at 35mm place under first, second branch fully independently.This antenna is at present more common, is applied to the structure of wireless terminal antenna (based on the wireless indoor distribution antenna).But know just that from its complicated structure it must have higher cost, and shock resistance is relatively poor.The bandwidth characteristic figure of prior art antenna as shown in Figure 3 as seen, it is difficult to satisfy the requirement of present 3G communication to antenna.

Wireless terminal is constantly strengthened owing to function, the wireless module integrated level improves constantly, cost is pursued and is reduced and the environment influence very important to antenna, antenna is had higher requirement---need the design, low cost of wideer operating frequency, miniaturization, stronger anti-seismic performance etc., and, press for and a kind ofly can satisfy 3G communication multifrequency needs, miniaturization, less antenna affected by environment along with the maturation of 3G technology is popularized with using constantly.

Summary of the invention

Defective and product requirement in view of above-mentioned prior art existence, the objective of the invention is to propose a kind of tri-branch multi-frequency plane dipole antenna, to realize frequency bandspread, improve tenability, and keep the miniaturization and the excellent anti-seismic performance thereof of antenna device standards such as 2G, 3G and GPS.

Above-mentioned purpose of the present invention will be achieved by the following technical programs:

A kind of tri-branch multi-frequency plane dipole antenna, comprise housing, and bag be overlying on first branch in the housing, second branch, the 3rd branch, reveal copper district and feed, described first, second links to each other with corresponding circuit separately with the 3rd branch, it is characterized in that: described first, second, the 3rd branches into laminated structure interconnected in same plane, wherein said first branch and second branch are symmetricly set in the both sides of the 3rd branch, described first branch, second branch joins altogether in the end away from the 3rd branch, and fuse with the dew copper district of lower end, public domain, described feed is interspersed between first branch and second branch, and the upper end, Yu Lutong district that is connected with described three branches, and described the 3rd branch is wide structure gradually along revealing the copper district dorsad.

Further, aforesaid tri-branch multi-frequency plane dipole antenna, wherein this dew copper district is a silver-plated zone of dew copper; And this feed is an elongated copper sheet.

The application of tri-branch multi-frequency plane dipole antenna of the present invention, its outstanding effect is:

Antenna structure adds a PCB coupling plate by original two metal radiation fins, reduce to an only surplus single face pcb board as coupling, and the 3rd branch adopts gradually wide structure, its working range has also realized the broadening of GPS frequency range (1575MHz) on the basis that guarantees traditional GSM frequency range (900/1800/1900/2100MHz).In addition, the antenna structure of this plane dipole also has advantages such as volume is small and exquisite, anti seismic efficiency is remarkable, and excellent wireless telecommunications performance, so be widely used in based on CDMA2000, TD-SCDMA, the 3G wireless terminal product of standards such as WCDMA (based on indoor cover antenna).

Description of drawings

Following constipation closes the embodiment accompanying drawing, the specific embodiment of the present invention is described in further detail, so that technical solution of the present invention is easier to understand, grasp.

Fig. 1 is the structural representation of prior art antenna;

Fig. 2 is the structural representation of tri-branch multi-frequency plane dipole antenna of the present invention;

Fig. 3 is the bandwidth characteristic figure of prior art antenna;

Fig. 4 is the bandwidth characteristic figure of tri-branch multi-frequency plane dipole antenna of the present invention;

The implication of each Reference numeral is among the figure:

1～the first branch, 2～the second branches, 3～the 3rd branch, 4～dew copper district, 5～feed;

10～the first branches, 20～the second branches, 30～the 3rd branch, 40～dew copper district, 50～feed.

Embodiment

At the used antenna of wireless telecommunications in the existing communication technique field of mentioning in the background technology, especially indoorly be covered as main antenna structure complexity, the volume heaviness, and defectives such as the communication frequency of supporting is narrower, the technology of the present invention personnel have proposed a kind of tri-branch multi-frequency plane dipole antenna that can fully support multi-modulation scheme communications such as 3G through hammer away for many years.

As shown in Figure 2, be the structural representation of plane dipole antenna one preferred embodiment of the present invention.As seen from the figure, this tri-branch multi-frequency plane dipole antenna, comprise housing (not shown), first branch 10, second branch 20, the 3rd branch 30, reveal copper district 40 and feed 50, and first, second link to each other with corresponding circuit separately with the 3rd branch (circuit that links to each other is for the existing known mature technology of industry technical staff, so do not repeat them here).It should be noted that the present invention makes the further miniaturization of antenna structure, the technical characterictic that the communication bandwidth further expands shows as: this first branch 10, second branch 20 and the 3rd branch 30 are sheet body structure interconnected in same plane.Wherein this first branch 10 and second branch 20 are symmetricly set in the both sides of the 3rd branch 30, and first branch 10, second branch 20 joins altogether in the end away from the 3rd branch 30, and fuse with the dew copper district 40 of lower end, public domain, and the feed 50 of this elongated copper chip architecture is interspersed between first branch 10 and second branch 20, one end is coupled to the 3rd branch 30, the other end then with first branch 10,

second branch

20,40 upper ends, Yu Lutong district that are connected, and the 3rd branch 30 is wide structure gradually along revealing copper district 40 dorsad, increased the complexity of mutual coupling, thereby form repeatedly resonant tank, frequency range is widened thus.As shown in Figure 4, be the bandwidth characteristic figure of tri-branch multi-frequency plane dipole antenna of the present invention.

For ease of understanding, this dew copper district is one and reveals the silver-plated zone of copper.This first, second, third branch all adopts the thick FR-4 sheet material of 0.4mm-0.8mm, and PCB copper-clad plate employing FR-4 covers the single face wiring board of copper, because the cabling of this PCB copper-clad plate is all in the same plane, so have significant flatness of the response.

The present invention program's plane dipole antenna makes antenna structure be added the three-dimensional structure (high at least 35mm) of a PCB coupling plate by original two metal radiation fins, reduce to an only remaining original single face pcb board as coupling, the working range of this dipole antenna has guaranteed to cover traditional GSM frequency range (900/1800/1900/2100MHz) fully, can also realize the broadening (1575MHz) on the GPS frequency range.Because its simple version, smaller profile, stronger anti seismic efficiency and excellent wireless telecommunications performance are so can be widely used in based on CDMA2000 TD-SCDMA, the 3G wireless terminal product of standards such as WCDMA (based on indoor cover antenna).

Table 1: nearly horizontal plane directive gain of tri-branch multi-frequency plane dipole antenna and gross energy conversion efficiency chart

As shown in table 1, the antenna structure of this kind form has horizontal direction high-gain, high radiation efficiency.Specifically at 2G (GSM/CDMA), 3G (CDMA2000/TD-SCDMA/W-CDMA) standard, and on the broadening on the GPS frequency range (1575MHz), good performance is arranged all, conversion efficiency is more than 50%, and the gain on the nearly horizontal direction surpasses 3～4dBi.

The foregoing description only is explanation technical conceive of the present invention and characteristics; its purpose is to allow the personage that is familiar with this technology can understand content of the present invention and is implemented; can not limit protection scope of the present invention with this; all equivalences that spirit is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.

Claims

1. tri-branch multi-frequency plane dipole antenna, comprise housing, first branch, second branch, the 3rd branch, reveal copper district and feed, described first, second links to each other with corresponding circuit separately with the 3rd branch, it is characterized in that: described first, second, the 3rd branches into laminated structure interconnected in same plane, wherein said first branch and second branch are symmetricly set in the both sides of the 3rd branch, described first branch, second branch joins altogether in the end away from the 3rd branch, and fuse with the dew copper district of lower end, public domain, described feed is interspersed between first branch and second branch, and the upper end, Yu Lutong district that is connected with described three branches, and described the 3rd branch is wide structure gradually along revealing the copper district dorsad.

2. tri-branch multi-frequency plane dipole antenna according to claim 1 is characterized in that: described dew copper district is one and reveals the silver-plated zone of copper.

3. tri-branch multi-frequency plane dipole antenna according to claim 1 is characterized in that: described feed is an elongated copper sheet.