CN103036008B - Asymmetric dipole antenna - Google Patents
Asymmetric dipole antenna Download PDFInfo
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- CN103036008B CN103036008B CN201110298157.3A CN201110298157A CN103036008B CN 103036008 B CN103036008 B CN 103036008B CN 201110298157 A CN201110298157 A CN 201110298157A CN 103036008 B CN103036008 B CN 103036008B
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- support arm
- radiation
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- grounding
- base portion
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Abstract
The invention discloses an asymmetric dipole antenna. A radiation module and a grounding module which are formed by metal conductors and distributed at intervals are arranged on a substrate of the antenna. The radiation module and the grounding module are respectively provided with a radiation base part and a grounding base part, and two ends of the two base parts respectively extend in reversed mode to form two radiation support arms and two grounding support arms. The first radiation support arm and the second radiation support arm are orthogonal on the radiation base part, and the second radiation support arm extends toward the first radiation support arm in bending mode to form an arc shape body with an opening facing to the first radiation support arm. The first grounding support arm and the second grounding support arm are orthogonal on the grounding base part, the second grounding support arm forms a hook-shaped body extending and bending toward the first grounding support arm, and a feeder unit is used for connecting the feed point and the grounding point of the two base parts in feeding mode. The asymmetric dipole antenna can generate enough gaining effect. The field shape is not apt to be influenced according to test, blind points are shallow, and a radiation field is round, so that the condition of bad communication quality cannot occur easily on signal transceiving. The asymmetric dipole antenna is simple in structure, low in manufacture complexity and the like.
Description
Technical field
The invention relates to a kind of antenna structure, relate to a kind of asymmetric dipole antenna being applied to different wireless signal transport-type especially.
Background technology
Antenna structure now, omni-directional antenna all has great use for various radio communication device.This is because its radiation mode allows to play good transmission and reception in a mobile unit.For promoting the gain of omni-directional antenna, be the impedance matching promoting antenna, configuration most likely uses wider feed-in wiring or with back ring type loop to design Department of Radiation and grounding parts.
But wide feed-in wiring can cause its effect of signals transmitted signal of Department of Radiation, causes the coupling effect between feed-in wiring and Department of Radiation.Affect the impedance matching of antenna element, the width of frequency band is restricted.If increase the spacing between feed-in wiring and Department of Radiation, easily cause again the directive property of omni-directional antenna too high.On the other hand, though back ring type loop can obtain high-impedance behavior, the difficulty of technique can promote relatively, reduces antenna on the contrary and makes rate of finished products.
But in fact, no matter which kind of antenna, as long as when it is arranged at terrain obstruction region (example, corner, ceiling etc.), the yield value of specific direction must be had obviously not enough, so that on signal transmitting and receiving, occur the situation that communication quality is bad.Therefore, how to simplify antenna and make complexity, maintaining simultaneously or further promote the gain of antenna, is the problem that manufacturer should think deeply.
Summary of the invention
For the problems referred to above, the invention provides a kind of tool easy structure and maintain the antenna structure of high-gain.
Antenna structure provided by the present invention is a kind of asymmetric dipole antenna, and it comprises a substrate, a Radiation Module, an earthing module and a feeder unit.Radiation Module is configured at substrate by one first metallic conductor and is formed, and has a radiating base, and one first radiation support arm and one second radiation support arm are with orthogonal manner, and autoradiolysis base portion two ends are to extend towards a first direction.Second radiation support arm is bending towards the first radiation support arm direction to be extended, to form the arc shape of opening towards the first radiation support arm with radiating base.Radiating base comprises a load point.Earthing module compartment of terrain corresponds to Radiation Module, and is configured at substrate by one second metallic conductor and is formed, and has a ground connection base portion.One first ground connection support arm and one second ground connection support arm are orthogonal to ground connection base portion, and extend towards a second direction from its two ends.Second ground connection support arm is the hook-shaped shape propping up brachiocylloosis extension towards the first ground connection.One earth point corresponds to load point and is configured at ground connection base portion.Feeder unit connects load point and earth point in order to electrically to present.
The present invention separately provides a kind of asymmetric dipole antenna, and it comprises a substrate, a Radiation Module, an earthing module and a feeder unit.Radiation Module is configured at substrate by one first metallic conductor and is formed, and has a radiating base.One first radiation support arm and one second radiation support arm are with orthogonal manner, and autoradiolysis base portion two ends are to extend towards a first direction.Second radiation support arm extends towards the first radiation support arm direction, to form the arc shape of opening towards the first radiation support arm with radiating base.Radiating base comprises a load point.The corresponding Radiation Module in earthing module compartment of terrain, and be configured at substrate by one second metallic conductor and formed, there is a ground connection base portion.One first ground connection support arm and one second ground connection support arm are orthogonal to ground connection base portion, to extend towards a second direction from ground connection base portion two ends.The hook-shaped shape that second ground connection support arm extends towards the first ground connection support arm.One earth point corresponds to load point and is configured at ground connection base portion.Wherein, the position that ground connection base portion extends to the first ground connection support arm is formed and has the turning point that inside contracts breach.Feeder unit connects load point and earth point in order to electrically to present.
For solving above-mentioned antenna structure problem, the present invention provides again a kind of asymmetric dipole antenna, and it comprises a substrate, a Radiation Module, an earthing module, a feeder unit and a reflector.
Substrate has a corresponding first surface and a second surface.Radiation Module is configured at first surface by one first metallic conductor and is formed, and has a radiating base.One first radiation support arm and one second radiation support arm are with orthogonal manner, autoradiolysis base portion two ends are to extend towards a first direction, second radiation support arm for by wide enter narrow and towards first radiation support arm direction extend, to form the arc shape of opening towards the first radiation support arm with radiating base.Radiating base comprises a load point.The corresponding Radiation Module in earthing module compartment of terrain, and be configured at first surface by one second metallic conductor and formed, there is a ground connection base portion.One first ground connection support arm and one second ground connection support arm are orthogonal to ground connection base portion, with from ground connection base portion two ends with towards one second direction extend.Second ground connection support arm props up the hook-shaped shape of brachiocylloosis extension towards the first ground connection.One earth point corresponds to load point and is configured at ground connection base portion.Feeder unit is fixed on substrate, and connect load point and earth point in order to electrically to present.Reflector is configured at the second surface of substrate.
Feature of the present invention is that antenna structure provided by the invention is different from the structure of prior art, even if be employed to be arranged at terrain obstruction region (example, corner, ceiling etc.) time, can also by its structure to produce enough gain effects, and its shape is not easily influenced after tested, blind spot (sags and crests) is more shallow, radiation field shape comparatively circle, therefore on signal transmitting and receiving, not easily there is the situation that communication quality is bad.Secondly, antenna structure provided by the invention, its structural rate back ring type circuit simplifies many, therefore effectively can reduce antenna making complexity.Its three, antenna structure provided by the present invention, it can meet the demand in design of dual-band dual-polarized antenna now, when meeting the demand of gain, also meets the demand of multifrequency transmittability simultaneously, therefore significantly promotes its applicability.
Accompanying drawing explanation
Fig. 1 is the first configuration diagram of asymmetric dipole antenna embodiment of the present invention;
Fig. 2 is the second configuration diagram of asymmetric dipole antenna embodiment of the present invention;
Fig. 3 is the third configuration diagram of asymmetric dipole antenna embodiment of the present invention;
Fig. 4 A is an embodiment of the radiation field shape corresponding vertical signal gain schematic diagram of asymmetric dipole antenna of the present invention;
Fig. 4 B is an embodiment of the radiation field shape corresponding horizontal signal gain schematic diagram of asymmetric dipole antenna of the present invention;
Fig. 4 C is another embodiment of the radiation field shape corresponding vertical signal gain schematic diagram of asymmetric dipole antenna of the present invention; And
Fig. 4 D is another embodiment of the radiation field shape corresponding horizontal signal gain schematic diagram of asymmetric dipole antenna of the present invention.
Main element symbol description:
1 substrate 2 Radiation Module
The first end of 20 radiating base 201 radiating base
Second end 21 first radiation support arm of 202 radiating base
22 second radiation support arm 221 first sections
222 second section 23 load points
3 earthing module 30 ground connection base portions
Second end of the first end 302 ground connection base portion of 301 ground connection base portions
31 first ground connection support arm 32 second ground connection support arms
321 jointings 322 hook section
33 earth point 34 turning points
35 inside contract breach 4 feeder unit
Second end of first end 42 feeder unit of 41 feeder units
5 G gap, reflector.
Embodiment
Hereby coordinate and graphic present pre-ferred embodiments to be described in detail as follows.
First please refer to the first configuration diagram of the asymmetric dipole antenna embodiment of the present invention that Fig. 1 illustrates.This asymmetric dipole antenna comprises substrate 1, Radiation Module 2, earthing module 3 and a feeder unit 4.Below, the reference orientation coordinating Fig. 1 to illustrate is described.
This Radiation Module 2 is configured on substrate 1 by one first metallic conductor and is formed, earthing module 3 is configured on substrate 1 by one second metallic conductor and is formed, the relevant way such as generation type is crossed as circuit board etching, molten metal vapour deposition, metal spatter, metal coating are all applicable, not limited.
Radiation Module 2 has a radiating base 20, at this for elongate in shape, and is provided with a load point 23 in wherein.The first end 201 of one first radiation support arm 21 autoradiolysis base portion 20, to extend towards a first direction.Second end 202 of the second radiation support arm 22 autoradiolysis base portion 20, also extends towards first direction.At this first direction for+Y-direction.
As Fig. 1, the first radiation support arm 21 is orthogonal to radiating base 20.After second end 202 of the second radiation support arm 22 autoradiolysis base portion 20 extends, bendingly to the first radiation support arm 21 direction to extend, and form the arc shape of opening towards the first radiation support arm 21 with radiating base 20.
The corresponding Radiation Module 2 at earthing module 3 interval and be configured on substrate 1, the allocation position of earthing module 3 is mutually corresponding with the allocation position of Radiation Module 2.Earthing module 3 comprises a ground connection base portion 30, in this for elongate in shape, and is provided with an earth point 33 in wherein, the allocation position of the corresponding load point 23 of allocation position of earth point 33.Can have a clearance G between ground connection base portion 30 and radiating base 20, clearance G size is the impedance matching of respective antenna and gain and adjusts to some extent.One first ground connection support arm 31 from the first end 301 of ground connection base portion 30, with towards one second direction extend.Second ground connection support arm 32, from the second end 302 of ground connection base portion 30, also extends towards second direction.Second direction and first direction are just in time contrary, in this example, namely refer to-Y-direction.
As Fig. 1, the first ground connection support arm 31 is orthogonal to ground connection base portion 30.Second ground connection support arm 32 is after ground connection base portion 30 extends, and the slightly bending extension towards the first ground connection support arm 31 direction, to form a hook-shaped shape.The inner edge of the second ground connection support arm 32 presents arc and inside contracts.
On arrangements of components position, the allocation position of corresponding second radiation support arm 22, the second ground connection support arm 32 of the allocation position of the first ground connection support arm 31 can corresponding first radiation support arm 21, makes Radiation Module 2 and earthing module 3 form an asymmetric and configures.
Feeder unit 4 connects above-mentioned load point 23 and earth point 33 in order to electrically to present, and is described in this with the feeder line support arm of a direct rod shape.The feeder line support arm of this example is Y direction configuration, feeder line (not shown) is had in feeder line support arm, the first end 41 of its self-feed line support arm and feedback is connected to load point 23 and earth point 33, and extended by the second end 42 of feeder line support arm, for being electrically connected relevant circuit, electronic component or device.
For coordinating the adjustment operation that impedance, gain etc. are relevant, respective change design can be carried out to antenna structure.Such as:
(1) design is restricted to the position of load point 23, makes the length of load point 23 to the first radiation support arm 21 end, equal with the length of load point 23 to the second radiation support arm 22 end.
(2) being restricted design to the position of earth point 33, making the length of earth point 33 to the first ground connection support arm 31 end, is the twice of the length of earth point 33 to the second radiation support arm 22 end.
(3) design is restricted to the shape of the second radiation support arm 22.After the second radiation support arm 22 autoradiolysis base portion 20 extends, except arc shape, also present by wide enter narrow shape.At this, the second radiation support arm 22 being divided into two sections, is orthogonal one first section 221 and one second section 222.Second section 222 is connected between the first section 221 and radiating base 20, and mutually vertical with radiating base 20.As Fig. 1, the wide elongate in shape that the first section 221 configures for X-direction, the second section 222 is Y-direction configuration, and for by wide enter narrow arc shape.On the whole, the width of the second section 222 is two to three times of the first section 221.
(4) design is restricted to the shape of the second ground connection support arm 32.At this, the second ground connection support arm 32 is divided into two sections that a jointing 321 and hooks section 322.Jointing 321 is connected to and hooks between section 322 and ground connection base portion 30.As Fig. 1, jointing 321 is Y-direction configuration, and mutually vertical with ground connection base portion 30.And hook section 322 when towards bending extension, also slightly present by wide enter narrow Design Mode.On the whole, the width of jointing 321 is about the twice hooking section 322 width.
(5) design is restricted to the shape of the first radiation support arm 21.As Fig. 1, the first radiation support arm 21 extended by radiating base 20, in shape, presents by narrow to wide elongate in shape.The purposes of respective antenna, the first radiation support arm 21 two ends can present oblong-shaped, and the change (gradient) of width then designs the centre portion in the first radiation support arm 21.Wherein, the Breadth Maximum of the first radiation support arm 21 is the twice of a minimum widith of the first radiation support arm 21.
(6) design is restricted to the shape of the first ground connection support arm 31.As Fig. 1, the first ground connection support arm 31 extended by ground connection base portion 30, presents by narrow to wide elongate in shape in shape.The purposes of respective antenna, the first ground connection support arm 31 two ends can present oblong-shaped, and the change (gradient) of width then designs the centre portion in the first ground connection support arm 31.Wherein, the Breadth Maximum of the first ground connection support arm 31 is the twice of a minimum widith of the first ground connection support arm 31.In addition, the first ground connection support arm 31 and the first radiation support arm 21, also can design forming shape identical, or shape size is the form of equal proportion.Or further, for the impedance matching of antenna can be improved, length adjustment can be carried out to the first radiation support arm 21 and the first ground connection support arm 31.
Refer to the second configuration diagram of the asymmetric dipole antenna embodiment of the present invention that Fig. 2 illustrates.Different from the first framework be in, the position that ground connection base portion 30 extends to the first ground connection support arm 31 is formed with a turning point 34, this turning point 34 inner edge is formed with one and inside contracts breach 35, to be inside contracted the impedance matching that breach 35 improves antenna by this, and promotes antenna gain.This inside contracts the impedance matching that breach 35 may correspond to antenna, to make different profile design.
Refer to the third configuration diagram of the asymmetric dipole antenna embodiment of the present invention that Fig. 3 illustrates.Be in different from foregoing structure has two corresponding first surfaces 101 and second surface 102 in, substrate 1.5, first surface 101, reflector that Radiation Module 2, earthing module 3 are configured at substrate 1 with feeder unit 4 is the second surface 102 being configured at substrate 1.
As Fig. 3, being covered with in second surface 102 of reflector 5 globality.Also or, reflector 5 local configuration is in second surface 102.Again or, reflector 5 can net-like configuration in second surface 102.Known, reflector 5 configuration mode is the demand of corresponding designer and determines, and does not limit to some extent.In addition, reflector 5 generation type is crossed as circuit board etching, molten metal vapour deposition, metal spatter, the relevant way such as metal coating, coated sheet metal sheet (tin platinum or aluminium platinum) is all applicable, not limited.
Please sequentially consult the gain schematic diagram that Fig. 4 A to Fig. 4 D is asymmetric dipole antenna of the present invention.Fig. 4 A is an embodiment of the radiation field shape corresponding vertical signal gain schematic diagram of asymmetric dipole antenna of the present invention, in this, with the frequency of WIFI-2.4GHz to 2.5GHz for test environment, and obtains the test data of asymmetric dipole antenna to vertical signal gain.As Fig. 4 A, be respectively level field shape, perpendicualr field shape and comprehensive field shape (horizontal+vertical) from left to right.
Fig. 4 B is an embodiment of the radiation field shape corresponding horizontal signal gain schematic diagram of asymmetric dipole antenna of the present invention.In this, with the frequency of WIFI-2.4GHz to 2.5GHz for test environment, and obtain the test data of asymmetric dipole antenna to horizontal signal gain.As Fig. 4 B, be respectively level field shape, perpendicualr field shape and comprehensive field shape (horizontal+vertical) from left to right.
Known from Fig. 4 A and Fig. 4 B, in the frequency of WIFI-2.4GHz to 2.5GHz, horizontal radiation field shape is comparatively serious with the sags and crests situation of 270 degree in angle 90 degree, but vertical radiation field shape generally comparatively circle, after both radiation field shapes combine, the radiation field shape formed also presents circular, and this antenna structure known has yield value and the stability of certain degree.
Fig. 4 C is another embodiment of the radiation field shape corresponding vertical signal gain schematic diagram of asymmetric dipole antenna of the present invention, in this, with the frequency of WIFI-4.9GHz to 6.0GHz for test environment, and obtain the test data of asymmetric dipole antenna to vertical signal gain.As Fig. 4 C, be respectively level field shape, perpendicualr field shape and comprehensive field shape (horizontal+vertical) from left to right.
Known from Fig. 4 C, in the frequency of WIFI-4.9GHz to 6.0GHz, horizontal radiation field shape is quite serious deformation of unevenness, but vertical radiation field shape generally comparatively circle, after both radiation field shapes combine, the radiation field shape formed also presents circular, and this antenna structure known has yield value and the stability of certain degree.
Fig. 4 D is another embodiment of the radiation field shape corresponding horizontal signal gain schematic diagram of asymmetric dipole antenna of the present invention.In this, with the frequency of WIFI-4.9GHz to 6.0GHz for test environment, and obtain the test data of asymmetric dipole antenna to horizontal signal gain.As Fig. 4 D, be respectively level field shape, perpendicualr field shape and comprehensive field shape (horizontal+vertical) from left to right.
Known from Fig. 4 D, in the frequency of WIFI-4.9GHz to 6.0GHz, horizontal radiation field shape and vertical radiation field shape slightly decline in the gain of angle 90 degree with 270 degree, but after both radiation field shapes combine, the radiation field shape formed is ovalize slightly, therefore with regard to signal transmitting and receiving and antenna gain face, this antenna structure is yield value and the stability with certain degree.
In sum, being only execution mode or the embodiment of notebook invention for presenting adopted technological means of dealing with problems, being not used for limiting the scope of patent working of the present invention.Namely all and of the present invention patent claim contexts conform to, or change according to the equalization that the scope of the claims of the present invention does and modify, and are all scope of patent protection of the present invention and contain.
Claims (3)
1. an asymmetric dipole antenna, is characterized in that, it comprises:
One substrate;
One Radiation Module, be configured at this substrate by one first metallic conductor formed, it has a radiating base, one first radiation support arm and one second radiation support arm, respectively with orthogonal manner from these radiating base two ends with towards one first direction extend, this the second radiation support arm by wide enter narrow and towards this first radiation support arm direction extend, to form the arc shape of opening towards this first radiation support arm with this radiating base, this radiating base comprises a load point;
One earthing module, compartment of terrain is to should Radiation Module and be configured at this substrate by one second metallic conductor and formed, it has a ground connection base portion, one first ground connection support arm and one second ground connection support arm are orthogonal to this ground connection base portion, to extend from these ground connection base portion two ends towards a second direction, this the second ground connection support arm is the hook-shaped shape propping up brachiocylloosis extension towards this first ground connection, one earth point corresponds to this load point and is configured at this ground connection base portion, wherein, the position that this ground connection base portion extends to this first ground connection support arm is formed one has the turning point that inside contracts breach; And
One feeder unit, connects this load point and this earth point in order to electrically to present.
2. asymmetric dipole antenna as claimed in claim 1, it is characterized in that, this load point is to the length of this first radiation leg extremities, be equal to the length of this load point to this second radiation leg extremities, this earth point to the length of this first ground connection leg extremities, for this earth point is to the twice of the length of this second ground connection leg extremities.
3. asymmetric dipole antenna as claimed in claim 1, it is characterized in that, this the second radiation support arm has orthogonal one first section and one second section, this second section is connected between this first section and this radiating base, and it is mutually vertical with this radiating base, the width of this second section is two to three times of this first section, this the second ground connection support arm comprises a jointing and and hooks section, this jointing is connected between this hook section and this ground connection base portion, and it is mutually vertical with this ground connection base portion, the width of this jointing is the twice of the width of this hook section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110298157.3A CN103036008B (en) | 2011-10-08 | 2011-10-08 | Asymmetric dipole antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110298157.3A CN103036008B (en) | 2011-10-08 | 2011-10-08 | Asymmetric dipole antenna |
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| Publication Number | Publication Date |
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| CN103036008A CN103036008A (en) | 2013-04-10 |
| CN103036008B true CN103036008B (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110298157.3A Expired - Fee Related CN103036008B (en) | 2011-10-08 | 2011-10-08 | Asymmetric dipole antenna |
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| CN (1) | CN103036008B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI556507B (en) * | 2012-05-24 | 2016-11-01 | 奈特吉爾公司 | High efficiency antenna |
| TWI617091B (en) * | 2016-06-14 | 2018-03-01 | 國立中山大學 | Communication device and antenna element therein |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143687A (en) * | 2013-05-09 | 2014-11-12 | ***通信集团浙江有限公司 | WLAN dual-frequency antenna device and communication device |
| CN104821426B (en) * | 2015-03-26 | 2017-05-10 | 南京邮电大学 | Loop-oscillator combined antenna |
| CN111725603B (en) * | 2019-03-18 | 2022-03-08 | 启碁科技股份有限公司 | Communication device and antenna structure |
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| CN1151621A (en) * | 1995-09-27 | 1997-06-11 | Ntt移动通信网株式会社 | Broadband antenna using semicircular radiator |
| US6211840B1 (en) * | 1998-10-16 | 2001-04-03 | Ems Technologies Canada, Ltd. | Crossed-drooping bent dipole antenna |
| CN1392631A (en) * | 2001-06-20 | 2003-01-22 | 株式会社村田制作所 | Surface mounted antenna and radio machine using surface mounted antenna |
| CN101047278A (en) * | 2006-03-30 | 2007-10-03 | 广达电脑股份有限公司 | Antenna with induction assembly |
| CN201117797Y (en) * | 2007-06-13 | 2008-09-17 | 华南理工大学 | Coplanar waveguide feeding radio frequency identification tag antenna |
| CN101617439A (en) * | 2007-02-19 | 2009-12-30 | 莱尔德技术股份有限公司 | Asymmetric dipole antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6943734B2 (en) * | 2003-03-21 | 2005-09-13 | Centurion Wireless Technologies, Inc. | Multi-band omni directional antenna |
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2011
- 2011-10-08 CN CN201110298157.3A patent/CN103036008B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151621A (en) * | 1995-09-27 | 1997-06-11 | Ntt移动通信网株式会社 | Broadband antenna using semicircular radiator |
| US6211840B1 (en) * | 1998-10-16 | 2001-04-03 | Ems Technologies Canada, Ltd. | Crossed-drooping bent dipole antenna |
| CN1392631A (en) * | 2001-06-20 | 2003-01-22 | 株式会社村田制作所 | Surface mounted antenna and radio machine using surface mounted antenna |
| CN101047278A (en) * | 2006-03-30 | 2007-10-03 | 广达电脑股份有限公司 | Antenna with induction assembly |
| CN101617439A (en) * | 2007-02-19 | 2009-12-30 | 莱尔德技术股份有限公司 | Asymmetric dipole antenna |
| CN201117797Y (en) * | 2007-06-13 | 2008-09-17 | 华南理工大学 | Coplanar waveguide feeding radio frequency identification tag antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI556507B (en) * | 2012-05-24 | 2016-11-01 | 奈特吉爾公司 | High efficiency antenna |
| TWI617091B (en) * | 2016-06-14 | 2018-03-01 | 國立中山大學 | Communication device and antenna element therein |
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| Publication number | Publication date |
|---|---|
| CN103036008A (en) | 2013-04-10 |
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