CN101557037B

CN101557037B - Dual feed dual frequency antenna

Info

Publication number: CN101557037B
Application number: CN 200810091198
Authority: CN
Inventors: 蔡调兴; 邱建评; 翁丰仁; 廖志威
Original assignee: Quanta Computer Inc
Current assignee: Quanta Computer Inc
Priority date: 2008-04-09
Filing date: 2008-04-09
Publication date: 2013-05-08
Anticipated expiration: 2028-04-09
Also published as: CN101557037A

Abstract

A dual feed dual band antenna comprising: a return conductor and a conductor arm; the loop conductor is an open loop and is provided with a first feed-in point and a second feed-in point for feeding in signals; the conductor arm extends from the return conductor. The loop conductor comprises a first feed-in section, a common loop section and a second feed-in section which are sequentially connected and surrounded; an opening is defined between the first feed-in section and the second feed-in section; the first feed-in point and the second feed-in point are respectively positioned on the first feed-in section and the second feed-in section. The invention has the advantages that the single antenna structure is respectively connected with the two radio frequency circuits at the two feed points to achieve the effect of working in multiple frequency bands, and the radiation parts with different lengths do not need to be arranged aiming at different frequency bands to cause volume increase.

Description

Double-feed-in double-frequency antenna

Technical field

The invention relates to a kind of dual-band antenna, refer to especially a kind of double-feed-in double-frequency antenna.

Background technology

The wireless communication technology development so far, has different radio communication standard in various places for different demands, also therefore develop the radio communication specification that is positioned at different frequency range, in order to satisfy the radio wave of all size, it has been quite general application that antenna is designed to receive and dispatch multiband.

Traditional a kind of multiband that uses and the antenna sets of single feed-in, need to switch circuit (Antenna Switch), next switching as a plurality of frequency range receivers with one as described later.

Consult Fig. 1, No. 94121118 patent application case of TaiWan, China discloses a kind of antenna switcher 9, the antenna that will use in order to selection from two antennas 91,91 ', antenna switcher 9 comprises a power-supply unit 92, borrow one of electric power output switching signal that this power-supply unit 92 provides to switch signal generation unit 93, reach one and switch unit 94, this switch unit 94 is selected

antenna

91 or 91 according to the switching signal that switching signal generation unit 93 provides ' one of them is electrically connected to a back-end circuit 8.

But above-mentioned application case is for can the choice for use different antennae, except needs additionally use antenna switcher 9, for a plurality of antennas are set, a part of space that must account on the circuit module of the electronic installation of miniaturization day by day, and improve power consumption also produces suitable match complexity and the degree of difficulty that causes Antenna Design or make, and aspect cost consideration, if need many a kind of frequency ranges, need a respective antenna is set more, so will raise the cost widely.

Consult Fig. 2, also there are other can reach the antenna of multiband work with single structure, the disclosed a kind of dual-band and dual-feed of case as open in No. 200638605 patent of TaiWan, China enters antenna 80, this doubly-fed antenna 80 has two load points 81,82, and can be operated in a low-frequency band and a high frequency band, though this kind doubly-fed antenna 80 can solve aforementioned most of problem, but owing to designing different Departments of Radiation for different working bands, and can't effectively reduce the problem that takies limited circuit space, therefore still remain improvements.

Summary of the invention

The object of the present invention is to provide and a kind ofly can effectively dwindle the double-feed-in double-frequency antenna of antenna volume.

Another object of the present invention is to provide a kind of double-feed-in double-frequency antenna that is easy to adjust frequency range and impedance matching.

So double-feed-in double-frequency antenna of the present invention comprises: a return conductors and a conductor arm; This return conductors is an open loop, and is provided with one first load point and one second load point for the signal feed-in; This conductor arm is extended by this return conductors; This return conductors comprises that one first feed-in section, shares loop sections and one second feed-in section, above-mentioned three sequentially connect around; This first feed-in section and this second feed-in section define an opening between the two; This first load point and this second load point lay respectively on this first feed-in section and this second feed-in section; And this conductor arm is to be extended by this second feed-in section and this common return section joint, and roughly is the inboard that the L-type complications extend to this return conductors; And, this conductor arm comprise one by this second feed-in section and this common return section joint to inboard the first matching section that extends of this common return section, reach one by second matching section of this first matching section end towards the direction extension of this first feed-in section, and this second matching section is partly contiguous and parallel with this common return section, and this opening faces this second matching section.

Effect of the present invention is with the single antenna structure, is connected with two radio circuits respectively at two load points, reaches the effect in multiband work, and need to the Department of Radiation of different length is not set and cause volume to increase for different frequency range; In addition, utilize to adjust the length of this return conductors, can control easily the working frequency range of this double-feed-in double-frequency antenna, the also length of this conductor arm of capable of regulating is to adjust the impedance matching of antenna.

Description of drawings

Fig. 1 is a system block diagrams, and the antenna switcher (antenna switch) of tradition in order to elect from two antennas is described;

Fig. 2 is an end view, and the structure of traditional a pair of feed-in dual-band antenna is described;

Fig. 3 is a stereogram, and the structure of the preferred embodiment of double-feed-in double-frequency antenna of the present invention is described;

Fig. 4 is a stereogram, illustrates in the present embodiment, and the length of each member or width, the numeral that does not indicate with arrow in figure is the data of every length and width;

Fig. 5 is a datagram, shows when the present embodiment is done feed-in with the first load point its voltage standing wave ratio measurement result;

Fig. 6 is a datagram, shows when the present embodiment is done feed-in with the second load point its voltage standing wave ratio measurement result;

Fig. 7 is a datagram, shows when the present embodiment is done feed-in with the first load point the radiation pattern measurement result on X-Y plane, X-Z plane and Y-Z plane during at 2437MHz; And

Fig. 8 is a datagram, shows when the present embodiment is done feed-in with the second load point the radiation pattern measurement result on X-Y plane, X-Z plane and Y-Z plane.

The main element symbol description

1 return conductors

11 first feed-in sections

111 first load points

12 second feed-in sections

121 second load points

13 common return sections

14 openings

2 conductor arms

21 first matching sections

22 second matching sections

100 circuit boards

101 horizontal planes

102 vertical planes

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of following cooperation with reference to the preferred embodiment of accompanying drawing, can clearly present.

Before the present invention is described in detail, be noted that in the following description content, similarly element is to represent with identical numbering.

Consult Fig. 3, the preferred embodiment of double-feed-in double-frequency antenna of the present invention, comprise a return conductors 1 and a conductor arm 2, the present embodiment is located at the bending place of an electronic installation, and with the distributions that is positioned at Different Plane on the horizontal plane 101 and a vertical plane 102 that are each other an angle of 90 degrees of a circuit board 100, as shown in Figure 3, so can dwindle by the volume that this antenna is shared as far as possible, but also the present invention can be presented with other states, not be shown limit with the present embodiment and corresponding diagram.

Return conductors 1 is an open loop, and comprises that one first feed-in section 11, shares loop sections 13 and one second feed-in section 12, above-mentioned three sequentially connect around; The first feed-in section 11 and the second feed-in section 12 define an opening 14 between the two, and common return section 13 roughly is nonocclusive four limit types, and has an adjustable length L, and adjusting this length L can adjust the applicable working frequency range of the present embodiment.

Coordinate and consult Fig. 4, in the present embodiment, its width of the metal wire sections of common return section 13 is about 1 centimetre, the length L on long limit is about 25 centimetres, and minor face is about 7 centimetres, and this minor face approximately has respectively 4 centimetres and is located at

horizontal plane

101,3 centimetres are located at vertical plane 102, and the width of opening 14 is about 7 centimetres.It should be noted that above-mentioned length is all the specifications for coordinating the particular job frequency range to design, if need the radiofrequency signal of transmitting-receiving different frequency range, or other any design alterations are arranged, also can suitably change above-mentioned every length data, when can not be as limit.

consult Fig. 3 and Fig. 4, the first feed-in section 11 and the second feed-in section 12 respectively from the both sides of common return section 13 openings 14 to approximately 6 centimetres of downward-extensions, and have respectively one first load point 111 and one second load point 121 in end, this is first years old, two

load points

111, 121 are electrically connected to a transmission circuit (transceiver) (not shown) respectively, radiofrequency signal by these transmission circuit (not shown) through first, the

second load point

111, 121 feed-ins, gone out by aerial radiation again, or by antenna receiving signal, through first, the

second load point

111, 121 are passed to these transmission circuit (not shown).The development length of described the first feed-in section 11 of this section and the second feed-in section 12 is not limited to 6 centimetres, also can comply with actual operating position adjustment.

Consult Fig. 3, conductor arm 2 is to be extended by the second feed-in section 12 and shared loop sections 13 joints, and roughly is the tortuous inboard that extends to return conductors 1, L-type ground; Conductor arm 2 comprise one by the second feed-in section 12 with shared loop sections 13 joints to inboard the first matching section 21 that extends of common return section 13, reach second matching section 22, the second matching sections 22 that extended towards the direction of the first feed-in section 11 by the first matching section 21 ends and face opening 14.

The second matching section 22 is contiguous and parallel with shared loop sections 13 parts, as shown in Figure 3, so can increase coupling area, and define the length R of the second matching section, adjust the impedance that length R can change this antenna, with with transmission line (for example coaxial cable) impedance matching of these transmission circuits (radio circuit), make the present embodiment by the first load point 111 or the second load point 121 see into impedance be equivalent to 50 ohm, and be equal to the transmission line impedance (being generally 50 ohm) of these transmission circuits.

Coordinate and consult Fig. 4, in the present embodiment, the length R of this second matching section 22 is about 9 centimetres, and two ends respectively approximately with the dual-side of shared loop sections at a distance of 6 centimetres and 10 centimetres, this first matching section 21 is 5 centimeter length approximately, wherein approximately there are respectively 2 centimetres and are located at horizontal plane 101, approximately 3 centimetres are located at vertical plane 102, and above-mentioned length also can be revised according to situation, are not limited with aforementioned length, such as need are adjusted impedance matching, the length R that adjusts the second matching section 22 can reach the effect of wanting.

In the present embodiment, double-feed-in double-frequency antenna is with the first load point 111 during as the signal feed-in, can produce resonance with the frequency range 2.1GHz of one first resonance signal, during as the signal feed-in, can produce resonance with the second load point 121 with one second resonance signal 2.4GHz; Consult Fig. 5 and Fig. 6, learn through experiment, its voltage standing wave ratio (VSWR) measured value is respectively at all can be less than 2 in the frequency range around 2.1GHz and 2.4GHz.

Its radiation pattern of the present embodiment (Radiation Pattern), as shown in Figure 7, the radiation pattern measurement result when being the present embodiment on X-Y plane, X-Z plane and Y-Z plane at the first resonance signal 2140MHz.

Consult Fig. 8, the radiation pattern measurement result when being the present embodiment on X-Y plane, X-Z plane and Y-Z plane at the second resonance signal 2442MHz.Can be learnt by Fig. 7 and Fig. 8, the present embodiment all produces roughly isotropic radiation pattern on each measurement plane, thereby can satisfy the radiation demand of Wireless LAN system.

Comprehensive the above, the present embodiment provides another kind to be different from traditional double-feed-in double-frequency antenna structure, utilize the structure of return conductors and two load points to reach the effect of two-band, needn't set up again the Department of Radiation of different length, also therefore can effectively dwindle antenna volume, and, the length L of this return conductors 1 and the length R of this second matching section 22 adjusted, can adjust working frequency range and impedance respectively, can reach easily according to this requirement for the antenna specification.

Above-described, be only the preferred embodiments of the present invention, when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to content of the present invention changes and modifies, and all still belongs in the scope that the present invention contains.

Claims

1. A dual-feed dual-frequency antenna, comprising:

a loop conductor which is an open loop and provided with a first feed point and a second feed point for signal feed; and

a conductor arm extending from the return conductor;

Wherein, the loop conductor includes a first feed-in section, a common loop section and a second feed-in section, and the above three are connected and surrounded in sequence; between the first feed-in section and the second feed-in section An opening is defined; the first feeding point and the second feeding point are respectively located on the first feeding section and the second feeding section;

Wherein, the conductor arm is extended from the junction of the second feed-in section and the common circuit section;

Wherein, the conductor arm extends to the inner side of the loop conductor in an L-shaped meander;

Wherein, the conductor arm includes a first matching section extending from the junction of the second feeding section and the common loop section to the inside of the common loop section, and a first matching section extending from the end of the first matching section toward the first feeding section. a second matching segment extending in the direction of the segment;

Wherein, the second matching section is partially adjacent to and parallel to the common loop section; and

Wherein, the opening is facing the second matching section.

2. The dual-feed dual-frequency antenna according to claim 1, wherein the impedance of the dual-feed dual-frequency antenna viewed from the first feed point or the second feed point is equivalent to 50 ohms.