CN101420063B - Multi-antenna system - Google Patents

Abstract

The invention provides a multiaerial system used for reducing layout limit and element limit, comprising two aerials and an isolation cell. The isolation cell is arranged between the two aerials and comprises an inductance which is a ring formed by coupling and a capacitance; wherein, the inductance and the capacitance are excited for resonance on the resonance frequency which is the same as the operation frequency of the two aerials substantially, so as to increase the isolation of the two aerials.

Description

Multi-antenna system

FIELD

[0001] The present invention relates to a multi-antenna system, in particular to a multi-antenna system can be increased antenna isolation.

Background technique

[0002] In today's wireless communication systems, often using multiple antennas substantially the same operating frequency to transmit or receive signals, to improve the transmission performance without increasing the power or bandwidth. In order to achieve the purpose of miniaturization, the antennas are closely disposed, thereby causing mutual interference. Therefore, how to increase the isolation of these antennas become an important issue.

[0003] However, a method for increasing the antenna isolation many conventional layout constraints. For example, when using a slit (Slit), the slit can be disposed on the ground plane, and then ground by capacitors and inductors can not be produced by the slits instead of capacitors and inductors to the other, so that the joint element limit is greater. In addition, the inductance is also produced due to easy modeling, it will also be difficult to predict with a stopper (The bandstop) effect generated frequency. More importantly, due to limitations of the above arrangement, the increased antenna isolation method will occupy large areas traditionally.

SUMMARY

[0004] Accordingly, an object of the present invention to provide a multi-antenna system, the antenna isolation may be increased, and reduces the layout constraints and limitations element.

[0005] Accordingly, the present invention is a multi-antenna system comprising:

[0006] - a dielectric layer, made of a dielectric material, substantially parallel to each other including a first surface and a second surface;

[0007] - a ground plane made of conductive material disposed on the first surface;

[0008] The two feed lines, made of conductive material disposed on the second surface;

[0009] The second radiation element disposed on the second surface, and are respectively coupled to the two feed lines; and

[0010] an isolation unit disposed between the second radiation element, comprising a ring coupled to an inductor and a capacitor, the inductor and the capacitor or at most one end coupled to the ground plane;

[0011] wherein, the inductor and the capacitor is excited to resonate in the operating frequency of the second radiation element is substantially the same as a resonance frequency.

BRIEF DESCRIPTION

[0012] Figure I is a composition diagram illustrating a multi-antenna system of the embodiment of the present invention;

[0013] FIG. 2 is an exploded view of the Figure I embodiment described embodiment;

[0014] FIG. 3 is a simulation diagram illustrating the insertion loss of the embodiment of Figure I and is not an isolation unit;

[0015] FIG. 4 is a composition diagram illustrating another embodiment of the present invention; and

[0016] FIG. 5 is a simulation diagram illustrating the insertion loss of the embodiment and the embodiment of FIG. I in FIG. 4.

[0017] Main reference numerals DESCRIPTION

[0018] The dielectric layer 21

[0019] The first surface 211 [0020] 212 second surface

[0021] 22 ground plane

[0022] The feed line 23

[0023] The radiating element 25, 26

[0024] The isolation unit 27

[0025] The spiral inductor 271 [0026] 272 capacitor gap

[0027] Column 273 is connected

[0028] The connection post 274

[0029] 275 cable

[0030] 276 cable

[0031] Curve 31

[0032] Curve 51

detailed description

[0033] For the aforementioned and other technical contents, features and effects of the present invention, the following detailed description with reference to the drawings two embodiments, will be clearly presented.

[0034] Referring to FIGS. I and 2, which shows a multi-antenna system according to an embodiment of the invention, includes a dielectric layer 21, 22, two feed lines 23 and 24, a second radiation element and the ground plane 25, 26 an isolation unit 27 so as to form two printed antenna. The dielectric layer 21 made of a dielectric material and includes a first surface 211 substantially parallel to one another and the second surface 212. Ground plane 22 made of conductive material, and printed on the first surface 211 of the dielectric layer 2 I. Two feed lines 23, 24 made of conductive material, and printed on the second surface 212 of the dielectric layer 21 and ground plane 22 overlap. Two radiating elements 25, 26 made of conductive material, and printed on the second surface 212 of the dielectric layer 21 and ground plane 22 do not overlap, and are respectively coupled to the two feed lines 23, 24. In the present embodiment, the operating frequency of the two radiating elements 25, 26 are substantially the same.

[0035] The spacer means 27 made of conductive material and disposed on the dielectric layer 21, and is located between the two radiating elements 25,26. In the present embodiment, the isolation unit 27 includes a spiral inductor 271, a capacitor gap 272, two coupling studs 273, 274 and two connecting lines 275, 276. Spiral inductor 271, capacitor 272 and a gap 276 connecting lines printed on the first surface 211 of the dielectric layer 21, two columns 273 and 274 are connected through the dielectric layer 21, and the connecting lines 275 printed on a second surface of the dielectric layer 21 of the 212 on. One end of the spiral inductor 271 is coupled to one end of the gap of the capacitor 272 and to ground 22 through the connection line 276 is coupled, and the other end of the inductor spiral 271 are connected sequentially through the columns 273, 275 and the connection cable 274 is coupled column gap 272 to the other end of the capacitor, and thus the gap spiral inductor 271 can be considered a capacitor 272 ring structures.

[0036] The spiral inductor 271 and the second radiation element receiving gap capacitor 272 second radiation element excitation radiation 25, 26 resonate in a frequency of operation of the second radiation element 25, 26 is substantially the same resonant frequency, 25, 26 in order to increase isolation. 3, curves 31 and 32 representing no isolation unit 27 and the insertion loss of 27 (insertion loss) isolation unit.

[0037] In another embodiment, the isolation unit 27 may not include the connection line 276, so that the spiral inductor ends 271 are not coupled to the ground plane 22. 4, the isolation unit 27 may be increased still isolation of two radiating elements 25 and 26, except that the bandwidth becomes narrower. Shown, the curve 51 and 52 in FIG. 5 represent the insertion loss of connection lines 276 and 276 when the cable is not connected. [0038] In the case where a small area, by means of the spiral inductor 271 can be used to obtain a larger inductance value. In addition, since it is easy to model, and therefore easier to estimate the resonance frequency of the isolation unit 27.

[0039] It is noted that, in the above embodiments, the spiral inductor 271 may be replaced with a printed inductance other shapes, may be lumped (lumped) inductor in place. Capacitor 272 and the gap may be replaced by a printed capacitor or the total capacitance of the set of other shapes. Two radiating elements 25, 26 may be replaced with a printed radiating elements of other shapes, may be replaced with a chip antenna (chip antenna). Thus, restrictions on the use of the element therefore decreases. Further, the spiral inductor 271 and the capacitance of the gap 272 is printed on the first surface 211 of the dielectric layer 21, but may be a position of the printing on the second surface 21 of the dielectric layer 212, and may be provided according to two radiation elements 25, 26 in each direction of the radiation intensity is determined. When the radiation intensity of the second radiation elements 25 and 26 stronger, the spacer member 27 to provide better isolation of the antenna.

[0040] summarized above, by means disposed between the second antenna comprises an inductor and a capacitor of a spacer element, and one end is grounded, to achieve increased antenna isolation and reduces layout restrictive elements and limitations of the present invention.

[0041] The above are merely preferred embodiments of the present invention, only when the simple modifications and equivalent embodiments can thus define the scope of the present invention, i.e., almost all made under this Summary are still present within the scope of the invention. ,

Claims (4)

1. 1. A multi-antenna system, comprising: a dielectric layer made of a dielectric material, substantially parallel to each other including a first surface and a second surface; a ground plane made of conductive material, provided on the first surface; the second feed line made of a conductive material disposed on the second surface; second radiation element disposed on the second surface, and are respectively coupled to the two feed lines', and an isolation unit, disposed between the second radiation element, comprising a ring coupled to an inductor and a capacitor, the inductor and the capacitor or at most one end coupled to the ground plane; wherein the inductor and the capacitor is excited in the operating frequency of the two radiating elements are substantially identical on a resonant frequency.
2. The multi-antenna system according to claim I, wherein the capacitor and the excitation of the radiation of the electro-competent second radiation element.
3. The multi-antenna system according to claim 2, wherein the position of the isolation unit in the radiation intensity in each direction is determined based on the second radiation element.
4. The multi-antenna system according to claim I, wherein the second radiation element made of conductive material, and printed on the second surface, and the inductor and the capacitor is disposed on the first surface.