CN101420063B

CN101420063B - Multi-antenna system

Info

Publication number: CN101420063B
Application number: CN2007101679096A
Authority: CN
Inventors: 钟世忠; 林明达; 蔡志鸿
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2012-11-07
Anticipated expiration: 2027-10-26
Also published as: CN101420063A

Abstract

The present invention provides a multi-antenna system for reducing layout restrictions and component restrictions, which includes two antennas and an isolation unit. The isolation unit is located between the two antennas and includes an inductor and a capacitor coupled in a loop. The inductor and the capacitor are excited to resonate at a resonant frequency substantially the same as the operating frequency of the two antennas to increase the isolation between the two antennas.

Description

Multiaerial system

Technical field

The present invention is about a kind of multiaerial system, particularly a kind of multiaerial system that can increase isolation between antennas.

Background technology

In wireless communication system now, often use the antenna of a plurality of frequencies of same operation in fact to transmit or receive signal simultaneously, under the situation that does not increase power or frequency range, to improve transmission usefulness.In order to reach the purpose of miniaturization, these antenna can closely be provided with, thereby causes interfering with each other.Therefore, the isolation that how to increase these antenna becomes an important problem.

Yet the method that increases isolation between antennas traditionally has many layout restrictions.Such as, if utilize slit (slit), then can only slit be arranged on the ground plane, and ground plane can not replace with other electric capacity and inductance because of electric capacity and the inductance that slit produced, the related element limits that makes is also more.In addition, the inductance that is produced also owing to be not easy modelling, also will be difficult to estimate the frequency that band ends (bandstop) effect that produces.The more important thing is the restriction owing to above-mentioned various layouts, the method that increases isolation between antennas traditionally will take bigger area.

Summary of the invention

Therefore, the object of the present invention is to provide a kind of multiaerial system, can increase the isolation of antenna, and reduce layout restrictions and element limits.

So multiaerial system of the present invention comprises:

One dielectric layer is processed by dielectric material, comprises the first surface and the second surface that are parallel to each other in fact;

One ground plane is processed by electric conducting material, is arranged on this first surface;

Two feed lines are processed by electric conducting material, are arranged on this second surface;

Two radiant elements are arranged on this second surface, and couple this two feed lines respectively; And

One isolated location is arranged between this two radiant element, comprise being coupled to a ring-like inductance and an electric capacity, and this inductance or the maximum ends of this electric capacity is couple to this ground plane;

Wherein, this inductance and this electric capacity be stimulated and on a resonance frequency identical in fact with the frequency of operation of this two radiant element resonance.

Description of drawings

Fig. 1 is a constitutional diagram, and an embodiment of multiaerial system of the present invention is described;

Fig. 2 is an exploded view, the embodiment of key diagram 1;

Fig. 3 is a simulation drawing, the embodiment of key diagram 1 and the loss of the insertion when not having an isolated location;

Fig. 4 is a constitutional diagram, and another embodiment of the present invention is described; And

Fig. 5 is a simulation drawing, the insertion loss of the embodiment of key diagram 1 and the embodiment of Fig. 4.

The main element symbol description

21 dielectric layers

211 first surfaces

212 second surfaces

22 ground planes

23,24 feed lines

25,26 radiant elements

27 isolated locations

271 spiral inductances

272 gap capacitances

273 joint pins

274 joint pins

275 connecting lines

276 connecting lines

31,32 curves

51,52 curves

Embodiment

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

See also Fig. 1 and Fig. 2, the embodiment that it illustrates multiaerial system of the present invention comprises a dielectric layer 21, a ground plane 22, two

feed lines

23,24, two

radiant elements

25,26 and an isolated location 27, to form two printed antennas.Dielectric layer 21 is processed by dielectric material, and comprises first surface 211 and the second surface 212 that is parallel to each other in fact.Ground plane 22 is processed by electric conducting material, and is printed on the first surface 211 of dielectric layer 21.Two

feed lines

23,24 are processed by electric conducting material, and are printed on the second surface 212 of dielectric layer 21, and overlapping with ground plane 22.Two

radiant elements

25,26 are processed by electric conducting material, and are printed on the second surface 212 of dielectric layer 21, and not overlapping with ground plane 22, and are couple to two

feed lines

23,24 respectively.In the present embodiment, the frequency of operation of two

radiant elements

25,26 is identical in fact.

Isolated location 27 is processed by electric conducting material, and is arranged on the dielectric layer 21, and is at two radiant elements 25, between 26.In the present embodiment, isolated location 27 comprises a spiral inductance 271, a gap capacitance 272, two joint pins 273,274 and two connecting lines 275,276.Spiral inductance 271, gap capacitance 272 and connecting line 276 are printed on the first surface 211 of dielectric layer 21, and two joint pins 273,274 run through dielectric layer 21, and connecting line 275 is printed on the second surface 212 of dielectric layer 21.One end of spiral inductance 271 is couple to an end of gap capacitance 272; And see through connecting line 276 and be couple to ground plane 22; And the other end of spiral inductance 271 sees through the other end that joint pin 273, connecting line 275 and joint pin 274 are couple to gap capacitance 272 in regular turn, so spiral inductance 271 and gap capacitance 272 can be regarded as a ring type structure.

Spiral inductance 271 and gap capacitance 272 receive two

radiant elements

25,26 radiation excitation and on a resonance frequency identical in fact with the frequency of operation of two

radiant elements

25,26 resonance, to increase the isolation of two radiant elements 25,26.As shown in Figure 3, curve 31,32 is represented when isolated location 27 is arranged respectively and the loss of the insertion when not having isolated location 27 (insertion loss).

In another embodiment, isolated location 27 also can not comprise connecting line 276, makes two ends of spiral inductance 271 all not be couple to ground plane 22.As shown in Figure 4, isolated location 27 still can increase the isolation of two

radiant elements

25,26, and just its frequency range can narrow down.As shown in Figure 5, curve 51,52 is represented when connecting line 276 is arranged respectively and the loss of the insertion when not having connecting line 276.

Under the less situation of area, by using spiral inductance 271 can obtain bigger inductance value.In addition, owing to easy modelling, therefore also be prone to estimate the resonance frequency of isolated location 27.

It should be noted that spiral inductance 271 can replace with the printed inductance of other shape, also can use lump (lumped) inductance to replace in above-mentioned all embodiment.And gap capacitance 272 also can be replaced by the print capacitor or the lumped capacity of other shape.25,26 printing radiant elements that can replace with other shape of two radiant elements also can replace with antenna component (chip antenna).Thus, use the restriction of element therefore to tail off.Moreover; Spiral inductance 271 and gap capacitance 272 are to be printed on the first surface 211 of dielectric layer 21; But also can be to be printed on the second surface 212 of dielectric layer 21, and set position can be decided according to the radiation intensity of two

radiant elements

25,26 on all directions.When the radiation intensity of two

radiant elements

25,26 heals when strong, the antenna isolation effect that isolated component 27 provides better.

Conclude above-mentionedly, the present invention comprises the isolated component of an inductance and an electric capacity by between two antennas, being provided with one, and an end ground connection is arranged, to reach the purpose that increases isolation between antennas and reduce layout restrictions and element limits.

The above person is merely preferred embodiment of the present invention, and when not limiting the scope that the present invention implements with this, the simple equivalent of promptly doing according to content of the present invention generally changes and modifies, and all still belongs in the scope of the present invention.

Claims

1. A multi-antenna system comprising:

a dielectric layer, made of dielectric material, including a first surface and a second surface substantially parallel to each other;

a ground plane, made of conductive material, disposed on the first surface;

two feed lines, made of conductive material, arranged on the second surface;

two radiating elements, arranged on the second surface, and respectively coupled to the two feed lines; and

An isolation unit, arranged between the two radiating elements, includes an inductor and a capacitor coupled in a loop, and at most one end of the inductor or the capacitor is coupled to the ground plane;

Wherein, the inductor and the capacitor are excited to resonate at a resonance frequency that is substantially the same as the operating frequency of the two radiating elements.

2. The multi-antenna system according to claim 1, wherein the capacitor and the inductor are excited by the radiation of the two radiating elements.

3. The multi-antenna system according to claim 2, wherein the position of the isolation unit is determined according to the radiation intensity of the two radiating elements in each direction.

4. The multi-antenna system according to claim 1, wherein the two radiating elements are made of conductive material and printed on the second surface, and the inductor and the capacitor are disposed on the first surface.