CN102509875A - Broadband planar two-antenna system - Google Patents
Broadband planar two-antenna system Download PDFInfo
- Publication number
- CN102509875A CN102509875A CN2011103428614A CN201110342861A CN102509875A CN 102509875 A CN102509875 A CN 102509875A CN 2011103428614 A CN2011103428614 A CN 2011103428614A CN 201110342861 A CN201110342861 A CN 201110342861A CN 102509875 A CN102509875 A CN 102509875A
- Authority
- CN
- China
- Prior art keywords
- antenna
- circuit board
- printed circuit
- antenna unit
- broadband planar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
The invention relates to a broadband planar two-antenna system, which belongs to the technical field of multi-antenna of mobile terminals. The broadband planar two-antenna system printed on a printed circuit board comprises a dielectric slab, radiation antenna units a and b, microstrip feeders (1 and 2), deformed inverted L-shaped structures (7 and 8) of left and right half ground branches, a T-shaped ground branch structure (9) and a metal ground (10), wherein the radiation antenna unit a consists of folded monopole structures (3 and 5); the radiation antenna unit b consists of folded monopole structures (4 and 6); the radiation antenna units a and b are positioned on the front surface of the printed circuit board; the microstrip feeders (1 and 2) are positioned on the front surface of the printed circuit board and above a main ground; and the metal ground (10) is positioned on the back surface of the printed circuit board, and is used for simulating the other parts except antennae in the mobile terminal of a wireless communication system. The broadband planar two-antenna system has the characteristics of broadband, low cross coupling, low cost, angle diversity and applicability to the wireless communication mobile terminal, and is easy to manufacture and integrate.
Description
Technical field:
The present invention relates to a kind of broadband planar dual-antenna system, belong to the mobile terminal multi-antenna technical field.
Background technology:
Along with the very fast development of mobile radio telecommunications technology, increasingly high to the bulky information transmission requirement.The nineties in 20th century AT&T Labs researchers be applied to this notion of multiple-input and multiple-output (MIMO) in the wireless communication transmissions system after; From the clear multiple-input and multiple-output (MIMO) of the test platform Shanghai Stock Exchange of reality capacity and the effect of the availability of frequency spectrum the raising wireless communication system of tens of times even hundred times can be arranged; And in the multiaerial system of multiple-input and multiple-output (MIMO), diversity antenna technology is as a kind of means and extensively employing of quilt that strengthens performance in wireless communication systems through interference in reduction multipath fading and the channel.
In today research, mostly the many antenna forms that are applicable to portable terminal in multiple-input and multiple-output (MIMO) system are the type of many single-polarized antennas.In addition, the miniaturization of mobile terminal device development makes many antenna elements spacing continue to reduce, and the mutual coupling between antenna element also becomes the key factor that influences antenna problem in multiple-input and multiple-output (MIMO) system.Now, in a cellular communication system, be easy to realize letting several wavelength of antenna mutual distance in base station end.But,, need more than one antenna at the terminal in order to improve the downlink wireless quality of signals.In mobile communication terminal, how in its confined space, two above antennas to be installed is generally acknowledged difficult points.
As miniaturization, integrated antenna leading role, micro-strip paster antenna has received the comprehensive exploitation of various different designs targets with the flexibility of its three-dimensional structure.Yet relative bandwidth is narrower to be the major defect of micro-strip paster antenna.The method of present expansion micro-strip paster antenna bandwidth has a variety of, but these methods all are to be cost to increase to make complexity (like typing method) or reduce other performances of antenna (like the thicker dielectric-slab of employing, having reduced the efficient of antenna) mostly.
For undersized portable terminal, because the distance between the antenna element is very little, the effect of space, polarization diversity is limited, and the mutual coupling between the antenna element is very big usually, makes the efficient of antenna reduce, thereby reduces capability of communication system.Therefore, if design compact conformation, easy of integration, support multiple-input and multiple-output (MIMO) function and be applicable to the particularly multi-antenna structure of small size portable terminal of mobile communication terminal that will make multi-antenna technology be applied to handheld terminal becomes possibility.
Through the document retrieval, do not see the public reported identical with the present invention.
Summary of the invention:
The objective of the invention is to overcome the deficiency of prior art, and a kind of broadband planar dual-antenna system is provided.
Broadband planar dual-antenna system of the present invention; Through the symmetric arrays of antenna element position and the metal ground of antenna are carried out co-design; Reduce between the antenna element correlation, reduce the mutual coupling between the antenna element, thereby the efficient that improves antenna with increase capability of communication system; The space and the angle diversity technology of antenna have been utilized simultaneously; Adopt planar structure, it is integrated that antenna and communication system are easy to; Adopt circuit board (PCB, the Printed Circuit Board) processing technology of common digital circuit, the cost of antenna is reduced greatly.The present invention can not only be used for MIMO communication, also can be used for common wireless communications.
Broadband planar dual-antenna system of the present invention comprises: dielectric-slab, microstrip feed line (1 and 2); The radiating antenna unit a that folded monopole minor structure (3 and 5) constitutes; The radiating antenna unit b that folded monopole minor structure (4 and 6) constitutes, the distortion of a left side half ground branch fall L shaped structure (7), the distortion of right half ground branch fall L shaped structure (8); T shape ground branch structure (9), metal ground (10).Wherein:
Dielectric-slab, rectangular, be a printed circuit board;
A, b radiating antenna unit and corresponding microstrip feed line (1 and 2) are printed on the front of said printed circuit board (PCB); Described a, b radiating antenna unit form are the same, all are G type monopole antenna unit, and a, b radiating antenna unit and corresponding microstrip feed line (1 and 2) are with respect to the longitudinal axis symmetry of described printed circuit board (PCB).
Metal ground (10) is printed on the said printed circuit board (PCB) back side; Comprise the rectangular metal part that is used for other parts of analog wireless communication system and mobile terminal except that antenna; Distortion fall L shaped structure (7 and 8) as the PIFA antenna of placing back-to-back of capacitive feed, an and T shape ground structure (9) that is used for reducing mutual coupling between the antenna.
All process through deposited copper typography L shaped structure (8), T shape ground branch structure (9) and metal ground (10) of distortion of L shaped structure (7), right half ground branch of falling of the distortion of the radiating antenna unit b that the radiating antenna unit a that said microstrip feed line (1 and 2), folded monopole minor structure (3 and 5) constitute, folded monopole minor structure (4 and 6) constitute, a left side half ground branch.
The present invention has broadband, multiband, compact conformation, easy of integration, low-cross coupling, support multiple-input and multiple-output (MIMO) function; Be applicable to the particularly characteristics of the multi-antenna structure of small size portable terminal of mobile communication terminal; And employing ordinary numbers circuit manufacturing process; Manufacturing process is simple, and cost is low.
Description of drawings:
Fig. 1 is a kind of broadband planar dual-antenna system graphics that is used for portable terminal provided by the invention.
Fig. 2 is longitudinal sectional drawing for the A of Fig. 1 to view.
Fig. 3 is the structure chart of antenna element and feeder line to view for the B of Fig. 1.
Fig. 4 is the structure chart on metal ground to view for the C of Fig. 1.
Fig. 5 is the radiating antenna cellular construction embodiment dimensional drawing of broadband planar dual-antenna system of the present invention (B to view, left-right symmetric structure), and unit is millimeter (mm).
Fig. 6 is the structure embodiment dimensional drawing of broadband planar dual-antenna system of the present invention (C to view, left-right symmetric structure), and unit is millimeter (mm).
Fig. 7 is unit reflection coefficient (S parameter) figure of measurement of broadband planar dual-antenna system of the embodiment of Fig. 5, Fig. 6.
Fig. 8 is coupling coefficient (S parameter) figure between the unit of measurement of broadband planar dual-antenna system of embodiment of Fig. 5, Fig. 6.
Fig. 9 connects the excitation of 2.4GHz for antenna element in the broadband planar dual-antenna system of Fig. 5 embodiment; When another antenna element connects 50 ohm matched load; Gain pattern at E face and H face: Fig. 9-a and Fig. 9-b connect 2.4GHz excitation for antenna element a, when antenna element b connects matched load at the directional diagram of E face, H face; Fig. 9-c and Fig. 9-d connect 2.4GHz excitation for antenna element b, when antenna element a connects matched load at the directional diagram of E face, H face.
Embodiment:
The invention provides a kind of broadband planar dual-antenna system that is used for radio communication, its three-dimensional structure sketch map is as shown in Figure 1.The entire antenna structure is printed on two faces of printed circuit board (PCB); Comprise microstrip feed line 1,2, radiating antenna unit a and b (folded monopole minor structure 3 and 5 constitutes antenna element a, and folded monopole minor structure 4 and 6 constitutes antenna element b); The distortion of a left side half ground branch fall L shaped structure 7; The distortion of right half ground branch fall L shaped structure 8, T shape ground branch structure 9, metal ground 10.Wherein:
Two radiating antenna cellular construction a, b left and right sides mirror image symmetry and measure-alike, each radiating antenna unit constitutes (folded monopole minor structure 3 and 5 constitutes antenna element a, and folded monopole minor structure 4 and 6 constitutes antenna element b) by two folded monopole minor structures; Wherein the folded monopole minor structure 3 of radiating antenna unit a is used to constitute long current path, realizes the low-frequency resonant of antenna, and realizes the high-frequency resonant of antenna by the shorter current path of folded monopole minor structure 5.Metal ground 10 is as shown in Figure 4; Comprise and be used for the rectangular metal part of other part except that antenna in the analog wireless communication system and mobile terminal; Two L shaped structures 7 and 8 of falling of distortion, T shape ground branch 9, wherein T shape structure 9 with main floor respectively at narrow slot of the back side of radiating antenna unit a and b formation; This similar is in slot antenna; Energy that can electric current on the floor is entrained consumes with the mode of radiation, thereby reduces the earth-current coupling between each radiating antenna unit, increases the radiation efficiency of radiating antenna unit; The structure of falling L 7 and 8 controls respectively the resonant bandwidth of radiating antenna unit a and b through adjusting its length.
(feed line impedance should be 50 ohm with its corresponding microstrip feed line 1 and 2 for the radiating antenna unit a of described broadband planar dual-antenna system and b; To satisfy the impedance matching condition; Adopt feed microstrip line, or adopt the alternate manner feed, the length of feeder line is according to the position adjustment of distributing point and power supply; Shown in the figure for feed microstrip line) be printed on the both sides of the front upper of PCB; The metal ground 10 of antenna is printed on another face of PCB; The relative position of two faces as shown in Figure 3 (wire frame among Fig. 3 partly be pcb board and metal ground structure structure shown in the figure projection on the whole).
Technical scheme of the present invention is achieved in that at first a monopole folded antenna unit is 1/4 wave resonance pattern, therefore chooses suitable antenna element size according to working frequency range; Another monopole folded antenna unit also is 1/4 wave resonance pattern then, through the adjustment resonant path, two resonance points is merged, and realizes widening the purpose of the broadband planar dual-antenna system bandwidth that designs.
Performance for broadband planar dual-antenna system that the MIMO of being used for communication system portable terminal provided by the invention is described provides an instantiation below:
In this example, adopting dielectric substrate thickness is that 1.6mm, relative dielectric constant are 4.4, each several part size such as Fig. 5, shown in Figure 6, and the unit of all sizes is millimeter (mm) among the figure.
Unit reflection coefficient S11 (because mirror image symmetry in the broadband planar dual-antenna system left and right sides so S22 and S11 are equal, is omitted S22 here) with the broadband planar dual-antenna system of Fig. 5, size shown in Figure 6 actual measurement is as shown in Figure 7; Coupling coefficient S21 is as shown in Figure 8 between the unit of the broadband planar dual-antenna system of actual measurement.Find out by Fig. 7, unit reflection coefficient S11-10dB impedance frequency band is 1700～2900MHz; Find out that by Fig. 8 in 1700～2900MHz, coupling coefficient S21 all is not less than-15dB between the unit; Then with S11＜-10dB and S21＜-the antenna system working band of 15dB definition is 1700～2900MHz, has covered GSM (1710-2170MHz), DCS (1710-1880MHz), PCS (1850-1990MHz), PHS (1880-1930MHz), UMTS (1920-2170MHz) and WLAN (2400-2484MHz) frequency range.In addition, as shown in Figure 9, can find out through the gain pattern of actual measurement; When being operated in 1700～2900MHz; The gain pattern of two unit is complementary basically about the broadband planar dual-antenna system, can realize that directional diagram divides collection, satisfies the requirement of MIMO communication system to mobile terminal multi-antenna.
Claims (2)
1. a broadband planar dual-antenna system is characterized in that being printed on the broadband planar dual-antenna system on the printed circuit board (PCB), comprising: dielectric-slab; Microstrip feed line (1 and 2), the radiating antenna unit a that folded monopole minor structure (3 and 5) constitutes, the radiating antenna unit b that folded monopole minor structure (4 and 6) constitutes; The distortion of a left side half ground branch fall L shaped structure (7); The distortion of right half ground branch fall L shaped structure (8), T shape ground branch structure (9), metal ground (10); Wherein:
Dielectric-slab is a printed circuit board, and is rectangular;
A and b radiating antenna unit and corresponding microstrip feed line (1 and 2) are printed on the front of said printed circuit board (PCB); Described a is the same with b radiating antenna unit form, all is G type monopole antenna unit, and a and b radiating antenna unit and corresponding microstrip feed line (1 and 2) are with respect to the longitudinal axis symmetry of described printed circuit board (PCB);
Metal ground (10) is printed on the said printed circuit board (PCB) back side; Comprise the rectangular metal part that is used for other parts of analog wireless communication system and mobile terminal except that antenna; The distortion fall L shaped structure (7 and 8) as the capacitive feed back-to-back the placement the PIFA antenna; Thereby increase resonance frequency spread bandwidth, and the T shape ground branch structure (9) that is used for reducing mutual coupling between the antenna.
2. broadband planar dual-antenna system according to claim 1 is characterized in that: dielectric substrate thickness is that 1.6mm, relative dielectric constant are 4.4, and plane G type monopole antenna element length is 15mm, and the microstrip feed line width is 2.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103428614A CN102509875A (en) | 2011-11-03 | 2011-11-03 | Broadband planar two-antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103428614A CN102509875A (en) | 2011-11-03 | 2011-11-03 | Broadband planar two-antenna system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102509875A true CN102509875A (en) | 2012-06-20 |
Family
ID=46221940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103428614A Pending CN102509875A (en) | 2011-11-03 | 2011-11-03 | Broadband planar two-antenna system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102509875A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151607A (en) * | 2013-03-01 | 2013-06-12 | 清华大学 | Broadband double antenna system for mobile terminal, and decoupling method of broadband double antenna system |
| CN103178339A (en) * | 2012-09-24 | 2013-06-26 | 张伟强 | Printed wideband antenna |
| CN103682596A (en) * | 2013-12-05 | 2014-03-26 | 清华大学 | Broadband four-antenna system for mobile terminal |
| CN103700924A (en) * | 2013-12-05 | 2014-04-02 | 清华大学 | Circularly polarized angle diversity antenna |
| CN106654545A (en) * | 2016-07-13 | 2017-05-10 | 云南大学 | Left-handed material loading base station antenna |
| CN113871866A (en) * | 2021-09-07 | 2021-12-31 | 许昌许继软件技术有限公司 | PCB antenna |
| US11362420B1 (en) | 2021-05-18 | 2022-06-14 | Changsha Chixin Semiconductor Tech Co., Ltd. | Miniaturized printed ultra-wideband and bluetooth antenna |
| WO2022242146A1 (en) * | 2021-05-18 | 2022-11-24 | 长沙驰芯半导体科技有限公司 | Miniaturised ultra-wideband and bluetooth printed antenna |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673873A (en) * | 2009-10-12 | 2010-03-17 | 清华大学 | Planar dual-antenna system for mobile terminal |
| CN102176541A (en) * | 2011-03-14 | 2011-09-07 | 云南大学 | Three-frequency channel microstrip antenna used in wireless local area network |
| CN202633501U (en) * | 2011-11-03 | 2012-12-26 | 云南大学 | Wideband compact planar two-antenna system |
-
2011
- 2011-11-03 CN CN2011103428614A patent/CN102509875A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673873A (en) * | 2009-10-12 | 2010-03-17 | 清华大学 | Planar dual-antenna system for mobile terminal |
| CN102176541A (en) * | 2011-03-14 | 2011-09-07 | 云南大学 | Three-frequency channel microstrip antenna used in wireless local area network |
| CN202633501U (en) * | 2011-11-03 | 2012-12-26 | 云南大学 | Wideband compact planar two-antenna system |
Non-Patent Citations (1)
| Title |
|---|
| QINGYUAN LIU, ZHENGWEI DU, KE GONG, ZHENGHE FENG: "A compact wideband planar diversity antenna for mobile handsets", 《MICROWAVE OPT TECHNOL LETT》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178339A (en) * | 2012-09-24 | 2013-06-26 | 张伟强 | Printed wideband antenna |
| CN103151607A (en) * | 2013-03-01 | 2013-06-12 | 清华大学 | Broadband double antenna system for mobile terminal, and decoupling method of broadband double antenna system |
| CN103151607B (en) * | 2013-03-01 | 2016-04-20 | 清华大学 | For the broadband dual-antenna system based on decoupling line structure of mobile terminal |
| CN103682596A (en) * | 2013-12-05 | 2014-03-26 | 清华大学 | Broadband four-antenna system for mobile terminal |
| CN103700924A (en) * | 2013-12-05 | 2014-04-02 | 清华大学 | Circularly polarized angle diversity antenna |
| CN103700924B (en) * | 2013-12-05 | 2015-07-15 | 清华大学 | Circularly polarized angle diversity antenna |
| CN106654545A (en) * | 2016-07-13 | 2017-05-10 | 云南大学 | Left-handed material loading base station antenna |
| CN106654545B (en) * | 2016-07-13 | 2023-08-04 | 云南大学 | Base station antenna loaded with left-handed material |
| US11362420B1 (en) | 2021-05-18 | 2022-06-14 | Changsha Chixin Semiconductor Tech Co., Ltd. | Miniaturized printed ultra-wideband and bluetooth antenna |
| WO2022242146A1 (en) * | 2021-05-18 | 2022-11-24 | 长沙驰芯半导体科技有限公司 | Miniaturised ultra-wideband and bluetooth printed antenna |
| CN113871866A (en) * | 2021-09-07 | 2021-12-31 | 许昌许继软件技术有限公司 | PCB antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao et al. | Wideband MIMO antenna systems based on coupled-loop antenna for 5G N77/N78/N79 applications in mobile terminals | |
| CN101673873B (en) | Planar dual-antenna system for mobile terminal | |
| CN101005291B (en) | Double frequency plane two antenna system for mobile terminal | |
| Diallo et al. | Study and reduction of the mutual coupling between two mobile phone PIFAs operating in the DCS1800 and UMTS bands | |
| US9461371B2 (en) | MIMO antenna and methods | |
| CN102509875A (en) | Broadband planar two-antenna system | |
| CN101359770B (en) | Wide band double antenna system for mobile terminals | |
| CN101030672B (en) | Four-antenna mobile terminal system | |
| Abdullah et al. | Eight-element antenna array at 3.5 GHz for MIMO wireless application | |
| CN107154528B (en) | Single radiator-based compact single-layer planar structure tri-polarization MIMO antenna | |
| EP2617098B1 (en) | Antenna for diversity operation | |
| WO2012088837A1 (en) | Array antenna of mobile terminal and implementing method thereof | |
| CN102414914A (en) | Balanced metamaterial antenna device | |
| CN100372172C (en) | Four planes antenna system in use for mobile terminals in multiple input/output communication system | |
| JP2010524331A (en) | Polarization-dependent beam width adjuster | |
| CN101697380A (en) | Dual-polarized built-in slot antenna used for mobile terminal of wireless local area network | |
| EP2565985A1 (en) | Dual-polarized microstrip antenna | |
| CN202333140U (en) | Double-frequency-band planar two-antenna system | |
| Wong et al. | Three‐antenna MIMO system for WLAN operation in a PDA phone | |
| CN202633501U (en) | Wideband compact planar two-antenna system | |
| Abdullah et al. | Compact four-port MIMO antenna system at 3.5 GHz | |
| CN103367893A (en) | High-isolation broadband two-antenna system | |
| CN103326116B (en) | Small-size plane wide-band double-antenna system used for mobile terminal | |
| CA2776339C (en) | Antenna for multi mode mimo communication in handheld devices | |
| Wei et al. | Dual-band MIMO antenna array for compact 5G smartphones |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120620 |