CN104269613A - High-isolation MIMO tri-band antenna - Google Patents
High-isolation MIMO tri-band antenna Download PDFInfo
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- CN104269613A CN104269613A CN201410190085.4A CN201410190085A CN104269613A CN 104269613 A CN104269613 A CN 104269613A CN 201410190085 A CN201410190085 A CN 201410190085A CN 104269613 A CN104269613 A CN 104269613A
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Abstract
The invention relates to the field of antennas, in particular to a high-isolation MIMO tri-band antenna. Based on the antenna technology of adopting two symmetrically-placed radiating elements in which short circuit wires are loaded, the high-isolation MIMO inverted-F antenna capable of being applied to the E frequency band of a TD-LTE system, the 5.2 GHz frequency band of a WLAN system and the 3.5 GHz frequency band of a WIMAX system is provided. The center working frequencies of the antenna are 2.35 GHz, 3.5 GHz and 5.2 GHz respectively, and the isolations of the antenna at the center working frequencies are -16.05 dB, -8.25 dB and -19.41 dB respectively. High-isolation work of inverted-F antenna elements in an MIMO system is achieved; meanwhile, the antenna can transmit signals in different spatial orientations at the frequency bands and can also receive signals from different spatial orientations, thereby having the good MIMO function.
Description
Technical field
The present invention relates to field of antenna, is especially a kind of high-isolation MIMO three-frequency antenna.
Background technology
Along with the develop rapidly of radiotechnics, radio communication device is used in people's daily life in large quantities.In all kinds of antenna forms of Wireless Telecom Equipment built-in aerial, the advantages such as volume is little because having for inverse-F antenna, structure is simple, be easy to coupling and antenna cost of manufacture is low, WLAN, WIMAX and the TD-LTE system etc. of being widely used wireless communication field.
In recent years, WLAN (wireless local area network) (Wireless Local Area Networks, WLAN) and worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, WIMAX) obtain propagation and employment widely.WLAN is based on IEEE802.11 standard, and it can be used for carrying out transmission data, audio and video frequency signal etc.WIMAX is based on IEEE802.16 standard, can realize the high speed data transfer that maximum transmission distance is the Internet of 50 kilometers.At present, WLAN groundwork frequency range is 2.45GHz frequency range (2.4-2.484GHz), 5.2GHz frequency range (5.15-5.35GHz) and 5.8GHz frequency range (5.725-5.825GHz), and WIMAX operates mainly in 2.5GHz frequency range (2.5-2.69GHZ), 3.5GHz frequency range (3.4-3.69GHZ) and 5.5GHz frequency range (5.25-5.85GHZ).
TD-LTE (Time Division Long Term Evolution, time-division Long Term Evolution) is based on OFDMA technology, the universal standard organized to set up by 3GPP.TD-LTE technology, based on TD-SCDMA technology, can provide wireless multimedia communication service, and it has become one of forth generation mobile communication technology, and the E frequency range of TD-LTE is 2.32-2.37GHz.
MIMO represents MIMO technique, its signal transmitting terminal in system and receiving terminal are by certain regularly arranged multiple antenna element, to realize the signal that can send and receive multiple dimensional orientation simultaneously, improve the reliability of the capacity of communication system, the availability of frequency spectrum and channel, thus alleviate the problem of frequency spectrum resource deficiency now to a certain extent.
Miniaturized, multi-functional trend levels off to for present stage Wireless Telecom Equipment, miniaturization, multiband, high-isolation be it is also proposed to the terminal antenna being applicable to Wireless Telecom Equipment and can transmit and receive from requirements such as space different azimuth signals, but current common inverse-F antenna operating frequency is single, be placed in the lower and mutual shortcoming such as serious interference of isolation between the inverse-F antenna unit in mimo system.Therefore, how to improve the isolation in mimo system between inverse-F antenna unit, increase the working frequency range of inverse-F antenna and make it be applicable to more miniaturization, multi-functional communication equipment, thus the application of further genralrlization inverse-F antenna just becomes the key issue that present stage needs to solve.
Summary of the invention
The object of the invention is to provide a kind of MIMO three-frequency antenna with good isolation, is specifically realized by following technical scheme:
A kind of high-isolation MIMO three-frequency antenna, comprise two radiating elements and medium substrate, the two sides of described medium substrate have ground plane and ungrounded respectively, and the ground plane of a side is corresponding with ungrounded of another side, be connected with ground plane short circuit in described two radiating elements fit in medium substrate side respectively ungrounded.
Described high-isolation MIMO three-frequency antenna, it designs further and is, described radiating element is the inverse-F antenna with the first radiant body, the second radiant body and the 3rd radiant body, described first radiant body is parallel to each other with the 3rd radiant body and both one end are connected to form F shape with one end of the second radiant body is vertical with middle part respectively, first radiant body is connected with ground plane respectively by the first shortening contact, the second shortening contact with the second radiant body, and the other end of the 3rd radiant body is the feed of inverse-F antenna.
Described high-isolation MIMO three-frequency antenna, it designs further and is, described medium substrate is rectangular, for FR4 material is made, described ungrounded is the rectangle that width is less than medium substrate width, length is medium substrate length half, and the part beyond ungrounded is fitted with copper face and forms ground plane.
Described high-isolation MIMO three-frequency antenna, its further design be, the described medium substrate side identical with the feed of inverse-F antenna is provided with two perforates along the center line last time of the Width of medium substrate.
Described high-isolation MIMO three-frequency antenna, it designs further and is, the thickness of described medium substrate is 1.5mm, length is 53.0mm, and width is 11.0mm, and described two perforates are all in square, its degree of depth is all 0.2mm mutually with medium substrate, and its length of side is 1.5mm; The copper face thickness of ground plane is 0.036mm, and the width of inverse-F antenna and the first shortening contact 4 is 0.6mm, and thickness is 0.036mm, and the width of the second shortening contact 5 is 0.9mm, and thickness is 0.036mm; Inverse-F antenna, the first shortening contact, the second shortening contact are copper product and make.
Beneficial effect of the present invention is:
The present invention adopts two spatially symmetrical placements, load the radiating element antenna technology of shortening contact, propose one and can be used for TD-LTE system E frequency range, the high-isolation MIMO inverse-F antenna of wlan system 5.2GHz frequency range and WIMAX system 3.5GHz frequency range, this Antenna Operation frequency range is 2.32-2.38GHz, 3.43-3.55GHz and 5.13-5.25GHz, center operating frequency is respectively 2.35GHz, 3.5GHz and 5.2GHz, antenna is respectively-16.05dB at the isolation at above-mentioned each center operating frequency place,-8.25dB and-19.41dB, achieve the high-isolation work in mimo system between inverse-F antenna unit, simultaneously, antenna is at 2.35GHz, 3.5GHz and 5.2GHz frequency range can either transmit to different dimensional orientations, also the signal from different spaces orientation can be received, there is good MIMO function.The maximum gain of antenna is 2.63dBi, achieves the high-gain operating characteristic of antenna.
Accompanying drawing explanation
Fig. 1 is side-looking structural representation of the present invention.
Fig. 2 is upper surface schematic diagram of the present invention.
Fig. 3 is lower surface schematic diagram of the present invention.
Fig. 4 be the present invention when with feed 8 for return loss S (1,1) when port feed and return loss S(2,2) parameter schematic diagram.
Fig. 5 is the parameter schematic diagram of the isolation S of the present invention in the feed situation being port with feed 8 (1,2).
Wherein, 1-radiating element, 2-medium substrate, 3-ground plane, 4-first shortening contact, 5-second shortening contact, 6-first perforate, 7-second perforate, 8-feed.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is further described.
Composition graphs 1, Fig. 2 and Fig. 3, this high-isolation MIMO three-frequency antenna, comprise two radiating elements 1 and medium substrate 2, the two sides of medium substrate 2 have ground plane 21 and ungrounded face 22 respectively, and the ground plane of a side is corresponding with ungrounded of another side, be connected with ground plane short circuit in two radiating elements fit in medium substrate side respectively ungrounded, thus two radiating elements stagger mutually and are arranged on two sides of medium substrate.
Radiating element 1 is inverse-F antenna, be divided into first radiant body 11, second radiant body 12 and the 3rd radiant body 13 with linearly type, first radiant body 11 is parallel to each other with the 3rd radiant body 13 and both one end are connected to form F shape with one end of the second radiant body is vertical with middle part respectively, first radiant body 11 is connected with ground plane 21 respectively by the first shortening contact 4, second shortening contact 5 with the second radiant body 12, and the other end of the 3rd radiant body 13 is the feed 8 of inverse-F antenna.
Medium substrate 2 is rectangular, and for FR4 material is made, ungrounded face 22 is in the rectangle that width is less than medium substrate width, length is medium substrate length half, and the part beyond ungrounded face 22 is fitted with copper face and forms ground plane 21.Medium substrate 2 side identical with the feed 8 of inverse-F antenna is provided with two perforates along the center line last time of the Width of medium substrate, is respectively the first perforate 6, second perforate 7.
The concrete size of each several part of the present invention and material as follows, the thickness of medium substrate is 1.5mm, and length is 53.0mm, and width is 11.0mm, and two perforates are all in square, and both length of sides are 0.2mm, and its degree of depth is all 1.5mm mutually with dielectric substrate thickness; The copper face thickness of ground plane is 0.036mm, and the width of inverse-F antenna and the first shortening contact 4 is 0.6mm, and thickness is 0.036mm, and the width of the second shortening contact 5 is 0.9mm, and thickness is 0.036mm; Inverse-F antenna, the first shortening contact, the second shortening contact are copper product and make.
In order to have further understanding to properties of the present invention, draw out corresponding test data figure by specifically testing.
With reference to Fig. 4, give antenna with the simulation curve figure of the return wave loss parameter in the feed 8 feed situation that is port, radiating element 1 working frequency range 2.32-2.38GHz, 3.43-3.55GHz and 5.13-5.25GHz respectively as we can see from the figure, center operating frequency is respectively 2.35GHz, 3.5GHz and 5.2GHz.
With reference to Fig. 5, provide antenna with the simulation curve figure of the isolation parameter in the feed 8 feed situation that is port, the isolation at antenna operating frequency place centered by 2.35GHz, 3.5GHz and 5.2GHz is respectively-16.05dB ,-8.25dB and-19.41dB as we can see from the figure, achieve the work antenna of antenna high-isolation, entire physical performance meets the index demand of TD-LTE, WIMAX and wlan system.
Antenna of the present invention with feed 8 for when port feed maximum gain can reach 2.63dBi, achieve the characteristic of the high-gain work of antenna.
The design parameter of this patent selects to form on the basis of certain theory analysis, and experimental result shows that antenna performance is good.This embodiment experimental result shows, antenna is 2.35GHz place working frequency range at center operating frequency is 2.32GHz to 2.38GHz, and bandwidth is 60MHz, covers the requirement of the 2.32-2.37GHz frequency range of TD-LTE system E band requirement completely, antenna
return loss is-15.43dB,
return loss is-20.12dB; Be 3.5GHz place working frequency range at center operating frequency be 3.43GHz to 3.55GHz, bandwidth is 120MHz, antenna
return loss is-15.39dB,
return loss is-15.53dB; Be 5.2GHz place working frequency range at center operating frequency be 5.13GHz to 5.25GHz, bandwidth is 120MHz, antenna
return loss is-15.66dB,
return loss is-17.16dB, and antenna all can either receive the signal from multiple directions in 2.35GHz frequency range, 3.5GHz frequency range and 5.2GHz frequency range simultaneously, also can transmit to multiple directions simultaneously, can extensive use and multiple wireless communication terminal.
Claims (5)
1. a high-isolation MIMO three-frequency antenna, it is characterized in that comprising two radiating elements and medium substrate, the two sides of described medium substrate have ground plane and ungrounded respectively, and the ground plane of a side is corresponding with ungrounded of another side, be connected with ground plane short circuit in described two radiating elements fit in medium substrate side respectively ungrounded.
2. high-isolation MIMO three-frequency antenna according to claim 1, it is characterized in that, described radiating element is the inverse-F antenna with the first radiant body, the second radiant body and the 3rd radiant body, described first radiant body is parallel to each other with the 3rd radiant body and both one end are connected to form F shape with one end of the second radiant body is vertical with middle part respectively, first radiant body is connected with ground plane respectively by the first shortening contact, the second shortening contact with the second radiant body, and the other end of the 3rd radiant body is the feed of inverse-F antenna.
3. high-isolation MIMO three-frequency antenna according to claim 2, it is characterized in that, described medium substrate is rectangular, for FR4 material is made, described ungrounded is the rectangle that width is less than medium substrate width, length is medium substrate length half, and the part beyond ungrounded is fitted with copper face and forms ground plane.
4. high-isolation MIMO three-frequency antenna according to claim 2, is characterized in that, the described medium substrate side identical with the feed of inverse-F antenna is provided with two perforates along the center line last time of the Width of medium substrate.
5. high-isolation MIMO three-frequency antenna according to claim 4, is characterized in that, the thickness of described medium substrate is 1.5mm, length is 53.0mm, and width is 11.0mm, and described two perforates are all in square, both are 0.2mm at the length of side, and its degree of depth is all 1.5mm mutually with medium substrate; The copper face thickness of ground plane is 0.036mm, and the width of inverse-F antenna and the first shortening contact 4 is 0.6mm, and thickness is 0.036mm, and the width of the second shortening contact 5 is 0.9mm, and thickness is 0.036mm; Inverse-F antenna, the first shortening contact, the second shortening contact are copper product and make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410190085.4A CN104269613A (en) | 2014-05-07 | 2014-05-07 | High-isolation MIMO tri-band antenna |
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| CN201410190085.4A CN104269613A (en) | 2014-05-07 | 2014-05-07 | High-isolation MIMO tri-band antenna |
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| CN104269613A true CN104269613A (en) | 2015-01-07 |
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| CN201410190085.4A Pending CN104269613A (en) | 2014-05-07 | 2014-05-07 | High-isolation MIMO tri-band antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406181A (en) * | 2015-12-04 | 2016-03-16 | 福建星网锐捷网络有限公司 | Monopole antenna and multi-input-multiple-output antenna |
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| US6662028B1 (en) * | 2000-05-22 | 2003-12-09 | Telefonaktiebolaget L.M. Ericsson | Multiple frequency inverted-F antennas having multiple switchable feed points and wireless communicators incorporating the same |
| CN101170221A (en) * | 2006-10-25 | 2008-04-30 | 鸿富锦精密工业（深圳）有限公司 | MIMO antenna |
| EP2230717A1 (en) * | 2009-03-17 | 2010-09-22 | Research In Motion Limited | Wideband, high isolation two port antenna array for multiple input, multiple output handheld devices |
| CN103247867A (en) * | 2012-02-14 | 2013-08-14 | 启碁科技股份有限公司 | Radio frequency device, wireless communication device and method for improving isolation degrees of antennae |
| CN103647142A (en) * | 2013-11-21 | 2014-03-19 | 南京信息工程大学 | A double-frequency band MIMO inverted F antenna used for a WLAN and a WIMAX |
| CN203983482U (en) * | 2014-05-07 | 2014-12-03 | 南京信息工程大学 | A kind of high-isolation MIMO three-frequency antenna |
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2014
- 2014-05-07 CN CN201410190085.4A patent/CN104269613A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6662028B1 (en) * | 2000-05-22 | 2003-12-09 | Telefonaktiebolaget L.M. Ericsson | Multiple frequency inverted-F antennas having multiple switchable feed points and wireless communicators incorporating the same |
| CN101170221A (en) * | 2006-10-25 | 2008-04-30 | 鸿富锦精密工业（深圳）有限公司 | MIMO antenna |
| EP2230717A1 (en) * | 2009-03-17 | 2010-09-22 | Research In Motion Limited | Wideband, high isolation two port antenna array for multiple input, multiple output handheld devices |
| CN103247867A (en) * | 2012-02-14 | 2013-08-14 | 启碁科技股份有限公司 | Radio frequency device, wireless communication device and method for improving isolation degrees of antennae |
| CN103647142A (en) * | 2013-11-21 | 2014-03-19 | 南京信息工程大学 | A double-frequency band MIMO inverted F antenna used for a WLAN and a WIMAX |
| CN203983482U (en) * | 2014-05-07 | 2014-12-03 | 南京信息工程大学 | A kind of high-isolation MIMO three-frequency antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105406181A (en) * | 2015-12-04 | 2016-03-16 | 福建星网锐捷网络有限公司 | Monopole antenna and multi-input-multiple-output antenna |
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Application publication date: 20150107 |