CN104037502A - Tunable Antenna - Google Patents
Tunable Antenna Download PDFInfo
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- CN104037502A CN104037502A CN201310746492.4A CN201310746492A CN104037502A CN 104037502 A CN104037502 A CN 104037502A CN 201310746492 A CN201310746492 A CN 201310746492A CN 104037502 A CN104037502 A CN 104037502A
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Abstract
A tunable antenna is disclosed and includes a ground plane, a first radiation unit and a second radiation unit. The first radiation unit includes a feeding portion and a coupling portion. The feeding portion is electrically connected to a signal source. The second radiation unit surrounds a part of the coupling portion and includes a grounding end and a switch unit. The grounding end is electrically connected to the ground plane. The switch unit is electrically connected to the grounding end and the ground plane selectively. Under a circumstance of not changing the position of a short dot, the electric connection area of the second radiation unit and the ground plane is adjusted by the switch unit so as to switch the resonance frequency band of the tunable antenna, thus achieving multi-band antenna under a circumstance of limited configuration space.
Description
Technical field
The present invention relates to a kind of frequency-modulated antenna.
Background technology
Along with the communication technology is maked rapid progress, the energy reception/transmission multi-band wireless signal of telecommunication has become the function of radio communication device indispensability in recent years.But wireless communication standard is neither identical with the communication band of use all over the world, so radio communication device carrys out the radio signal of reception/transmission different frequency bands mainly with the antenna of design all channel antenna or branched different frequency bands at present, but these two kinds of methods all can face some difficulties and challenge.Along with radio communication device is more and more thinner, the limited space of internal antenna configuration, design all channel antenna has certain difficulty in research and development.
Summary of the invention
The invention provides a kind of frequency-modulated antenna and comprise ground plane, the first radiating element and the second radiating element.The first radiating element comprises feeding portion and coupling part, feeding portion electrical connection signal source.The second radiating element is around partial coupling portion, and comprises short-circuit end and switch unit.Short-circuit end electrical connection ground plane.Switch unit is optionally electrically connected short-circuit end and ground plane.
Thus, in the case of not changing the position of short dot, adjust the second radiating element and be connected to the electrical connection area of ground plane by switching device, to switch the resonance bands of frequency-modulated antenna, reach the in the situation that of limited configuration space, complete the antenna of multiband.
Brief description of the drawings
Fig. 1 is the frequency-modulated antenna of first embodiment of the invention and the schematic diagram of signal source.
Fig. 2 A is the equivalent schematic in the time that the switch unit of the frequency-modulated antenna of Fig. 1 opens circuit.
Fig. 2 B is switch unit when the frequency-modulated antenna of Fig. 1 equivalent schematic during in channel status.
Fig. 3 be Fig. 1 frequency-modulated antenna return to loss figure.
Fig. 4 is the frequency-modulated antenna of second embodiment of the invention and the schematic diagram of signal source.
Fig. 5 is the frequency-modulated antenna of third embodiment of the invention and the schematic diagram of signal source.
Fig. 6 is the frequency-modulated antenna of four embodiment of the invention and the schematic diagram of signal source.
Fig. 7 is the frequency-modulated antenna of fifth embodiment of the invention and the schematic diagram of signal source.
Fig. 8 is the frequency-modulated antenna of sixth embodiment of the invention and the schematic diagram of signal source.
Fig. 9 is the frequency-modulated antenna of seventh embodiment of the invention and the schematic diagram of signal source.
Figure 10 is the frequency-modulated antenna of eighth embodiment of the invention and the schematic diagram of signal source.
Embodiment
Below will disclose multiple execution mode of the present invention with accompanying drawing, as clearly stated, many concrete details will be explained in the following description.But, should be appreciated that, concrete details does not apply to limit the present invention.That is to say, in part execution mode of the present invention, concrete details is non-essential.In addition,, for the purpose of simplifying accompanying drawing, some known usual structures and element will represent in the mode of simply illustrating in the accompanying drawings.
Fig. 1 is the frequency-modulated antenna of first embodiment of the invention and the schematic diagram of signal source 200.As shown in the figure, frequency-modulated antenna comprises ground plane, the first radiating element 110 and the second radiating element 120.The first radiating element 110 comprises feeding portion 112 and coupling part 114, and feeding portion 112 is electrically connected signal source 200.The second radiating element 120 comprises short-circuit end 122 and switch unit 126, and wherein the second radiating element 120 is around the partial coupling portion 114 of the first radiating element 110.Short-circuit end 122 is electrically connected ground plane, and for example, in Fig. 1, short-circuit end 122 can be electrically connected to ground plane by short dot 124.Switch unit 126 selectivity electrical connection short-circuit ends 122, to adjust the electrical connection area of the second radiating element 120 and ground plane, and the resonance frequency of frequency-modulated antenna also can be adjusted whereby.
Therefore, the signal of signal source 200 can be inputted from the feeding portion of the first radiating element 110 112, to produce resonance mode at the first radiating element 110.Moreover the second radiating element 120 can be by producing other resonance mode with the first radiating element 110 electromagnetic coupled.On the other hand, can change the second radiating element 120 by control switch unit 126 and be connected to the electrical connection area of ground plane, therefore can change the resonance mode of the second radiating element 120.Thus, can reach the object of the resonance bands of adjusting frequency-modulated antenna.
Specifically, please with reference to Fig. 2 A and Fig. 3, wherein Fig. 2 A is the equivalent schematic in the time that the switch unit 126 of the frequency-modulated antenna of Fig. 1 opens circuit, the frequency-modulated antenna that Fig. 3 is Fig. 1 return to loss figure.When switch unit 126 (as shown in Figure 1) when off state (representing with " state 1 ") in Fig. 3, the resonance bands of the second radiating element 120 is approximately between 704～787MHz.
On the other hand, please with reference to Fig. 2 B and Fig. 3, wherein Fig. 2 B is switch unit 126 when the frequency-modulated antenna of Fig. 1 equivalent schematic during in channel status.When switch unit 126 when channel status (representing with " state 2 ") in Fig. 3, between the second radiating element 120 and ground plane also by switch unit 126 conductings.In Fig. 2 B, the radiation path of the second radiating element 120 is more short-and-medium than Fig. 2 A, and therefore the resonance bands of the second radiating element 120 can be promoted to 791～960MHz.On the other hand, another resonance bands of state 2 is approximately between 1710～2170MHz, and it is combined by the double frequency resonance frequency band of the second radiating element 120 and the resonance bands of the first radiating element 110.
Thus, in the case of not changing the position of short dot 124, the electrical connection area of being adjusted the second radiating element 120 and be connected to ground plane by switching device 126 to switch the resonance bands of frequency-modulated antenna, can complete wide band antenna in the situation that of limited configuration space.
Go back to Fig. 1.In the present embodiment, common definition the first coupling space 102 and the second coupling space 104 between the second radiating element 120 and the coupling part 114 of the first radiating element 110.The first coupling space 102 and the second coupling space 104 lay respectively at the relative both sides of coupling part 114.Energy by the first coupling space 102 and the second coupling space 104, the first radiating elements 110 can be coupled to the second radiating element 120, makes the second radiating element 120 produce resonance mode.It should be noted, the frequency range of the resonance mode that the second radiating element 120 produces can be determined by the size of the first coupling space 102 and the second coupling space 104.Taking the second coupling space 104 as example, when the value of the second coupling space 104 hour, while that is to say the coupling part 114 of close the first radiating element 110 of short-circuit end 122 of the second radiating element 120, between short-circuit end 122 and coupling part 114, have larger coupling capacitance, therefore the resonance mode of the second radiating element 120 can be changed.Similarly, the size of the first coupling space 102 also can affect the resonance mode of the second radiating element 120.Thus, as long as design the first coupling space 102 and the second coupling space 104, the i.e. resonance mode of capable of regulating the second radiating element 120.
Please refer to Fig. 4, the schematic diagram of its frequency-modulated antenna that is second embodiment of the invention and signal source 200.Present embodiment also comprises the 3rd radiating element 150 from different being in frequency-modulated antenna of the first execution mode.In present embodiment, the 3rd radiating element 150 and the first radiating element 110 are electrically connected.The 3rd radiating element 150 has turning point (meander portion), in order to increase the current path of frequency-modulated antenna.Particularly, the 3rd radiating element 150 and the first radiating element 110 entirety can form T shape.
In the present embodiment, the 3rd radiating element 150 has turning point, and therefore the radiation path of the 3rd radiating element 150 can be extended, to form the resonance frequency compared with low frequency.Taking Fig. 4 as example, the radiation path of the first radiating element 110 is short compared with the 3rd radiating element 150, the resonance frequency that the resonance frequency that therefore the first radiating element 110 produces produces higher than the 3rd radiating element 150.On the other hand, because the second radiating element 120 and ground plane form short circuit, therefore the radiation path essence of the second radiating element 120 is about 1/4 wavelength of resonance frequency.Other details as for present embodiment are identical with the first execution mode, therefore repeat no more.
Then please refer to Fig. 5, the schematic diagram of its frequency-modulated antenna that is third embodiment of the invention and signal source 200.Present embodiment is in the structure of the 3rd radiating element 150 from the different of the second execution mode.In the present embodiment, the turning point of the 3rd radiating element 150 is in a spiral manner to its internal bend.Therefore by bending the 3rd radiating element 150, under identical configuration area, the 3rd radiating element 150 can have longer radiation path, to produce the more resonance frequency of low frequency.Other details as for present embodiment are identical with the second execution mode, therefore repeat no more.
Then please refer to Fig. 6, the schematic diagram of its frequency-modulated antenna that is four embodiment of the invention and signal source 200.Present embodiment is in the structure of short-circuit end 122 from the different of the first execution mode.In the present embodiment, short-circuit end 122 comprises coupling element 128.Coupling element 128 is placed between short dot 124 and switch unit 126.Briefly, can change its short circuit characteristic by coupling element 128, the second radiating elements 120.For example, coupling element 128 can be inductance, and inductance has the effect of the radiation path that increases by the second radiating element 120.That is to say, when switch unit 126 is during in conducting state, the resonance bands of frequency-modulated antenna is identical with Fig. 2 B.If but switch unit 126 is in the time of off state, the resonance bands of the second radiating element 120 can be than Fig. 2 A condition 1 slightly toward low frequency skew.But coupling element 128 is not limited with inductance.Other details as for present embodiment are identical with the first execution mode, therefore repeat no more.
Then please refer to Fig. 7, the schematic diagram of its frequency-modulated antenna that is fifth embodiment of the invention and signal source 200.Present embodiment is in the existence of matching network (matching network) 160 from the different of the first execution mode.In the present embodiment, frequency-modulated antenna also can comprise matching network 160, electrical connection the first radiating element 110 and signal source 200.Particularly, between signal source 200 and frequency-modulated antenna, may there is the problem of impedance mismatch, cause the signal that imports feeding portion 112 from signal source 200 into produce signal reflex, cause energy loss.Therefore matching network 160 can be arranged between signal source 200 and feeding portion 112, occurs with the situation that reduces the impedance mismatch between signal source 200 and frequency-modulated antenna.
In other embodiments, matching network 160 can comprise the first match circuit (matching circuit) 162, the second match circuit 164, the first switching device 166 and the second switching device 168.The first switching device 166 is electrically connected signal source 200, and is selectively electrically connected the first matching element circuit 162 or the second matching circuit element 164.The second switching device 168 is electrically connected the first radiating element 110, and is selectively electrically connected the first matching circuit element 162 or the second matching circuit element 164.Specifically, the first match circuit 162 and the second match circuit 164 can be all the combination of electric capacity and/or inductance, and the first match circuit 162 can have different matched impedances from the second match circuit 164, and therefore different signals can be selected by different matching elements.For example, in the time thering is preferably impedance matching between the signal of signal source 200 and the first match circuit 162, the first switching device 166 and the second switching device 168 can be electrically connected to the first match circuit 162 jointly, to allow the signal of signal source 200 sequentially arrive feeding portion 112 by the first switching device 166, the first match circuit 162 and the second switching device 168.Otherwise, if while having preferably impedance matching between the signal of signal source 200 and the second matching element 164, the first switching device 166 and the second switching device 168 also can be electrically connected to the second match circuit 164 jointly.It should be noted, although in the present embodiment, matching network 160 comprises two match circuits, but the present invention is not as limit.The visual actual conditions of those skilled in the art, elasticity is selected the quantity of the match circuit of matching network 160.Other details as for present embodiment are identical with the first execution mode, therefore repeat no more.
Then please refer to Fig. 8, the schematic diagram of its frequency-modulated antenna that is sixth embodiment of the invention and signal source 200.The different quantity that are in switch unit of present embodiment and the first execution mode.In the present embodiment, the quantity of switch unit is multiple, and taking Fig. 8 as example, frequency-modulated antenna comprises two switch unit 126a and 126b.Therefore when switch unit 126a and 126b are during all in off state, the second radiating element 120 can produce lower resonance bands; When switch unit 126a is in channel status, and switch unit 126b is in the time of off state, and the resonance bands of the second radiating element 120 can be enhanced; And when switch unit 126a and 126b are during all in conducting state, the resonance frequency of the second radiating element 120 can further be enhanced.Therefore by controlling the switch of switch unit 126a and 126b, the resonance bands of capable of regulating the second radiating element 120.It should be noted, although in the present embodiment, frequency-modulated antenna comprises two switch unit 126a and 126b, but the present invention is not as limit.The visual actual conditions of those skilled in the art, elasticity is selected the quantity of the switch unit of frequency-modulated antenna.Other details as for present embodiment are identical with the first execution mode, therefore repeat no more.
Then please refer to Fig. 9, the schematic diagram of its frequency-modulated antenna that is seventh embodiment of the invention and signal source 200.Present embodiment is in the existence of the 4th radiating element 170 from the different of the first execution mode.In the present embodiment, frequency-modulated antenna also can comprise the 4th radiating element 170, electrical connection the second radiating element 120.For example, in Fig. 9, the second radiating element 120 of part can be placed between the 4th radiating element 170 and the first radiating element 110, and in other words, relative the first radiating element 110 of the 4th radiating element 170 arranges.In the time that the second radiating element 120 and the first radiating element 110 produce electromagnetic coupled, the 4th radiating element 170 being electrically connected with the second radiating element 120 also can produce resonance mode.By designing shape and the length of the 4th radiating element 170, can change the resonance bands of the 4th radiating element 170, wherein the radiation path essence of the 4th radiating element 170 is about 1/4 wavelength of resonance frequency.Wherein can to increase resonance bands be about 2500～2690MHz to the 4th radiating element 170.That is to say, the 4th radiating element 170 can increase the overall bandwidth of frequency-modulated antenna.Other details as for present embodiment are identical with the first execution mode, therefore repeat no more.
Then please refer to Figure 10, the schematic diagram of its frequency-modulated antenna that is eighth embodiment of the invention and signal source 200.Present embodiment is in the existence of the 5th radiating element 180 from the different of the 7th execution mode.In the present embodiment, frequency-modulated antenna also can comprise the 5th radiating element 180, electrical connection the second radiating element 120.In the time that the second radiating element 120 and the first radiating element 110 produce electromagnetic coupled, the 5th radiating element 180 also can produce another resonance mode.By designing shape and the length of the 4th radiating element 180, can change the resonance bands of the 4th radiating element 180, wherein the radiation path essence of the 5th radiating element 180 is about 1/4 wavelength of resonance frequency.The 5th radiating element 180 can be in order to adjust the impedance matching of frequency-modulated antenna.
Particularly, the coupling part 114 of the first radiating element 110 has groove 118, part the 5th radiating element 180 be positioned at groove 118, with and coupling part 114 between form the 3rd coupling space 106.In other words, groove 118 is formed by the different change width of coupling part 114.There is less width at the 5th radiating element 180 and near the partial coupling portion 114 between part second radiating element 120 of short-circuit end 122, there is larger width away from the partial coupling portion 114 of the 5th radiating element 180.The value of the 3rd coupling space 106 can be less than the first coupling space 102, and therefore the energy of the first radiating element 110 can be passed to the second radiating element 120 by the 5th radiating element 180 more efficiently.Other details as for present embodiment are identical with the 7th execution mode, therefore repeat no more.
Although the present invention with embodiment openly as above; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little variation and retouching, therefore protection scope of the present invention is when being as the criterion depending on claims person of defining.
Claims (9)
1. a frequency-modulated antenna, is characterized in that, comprises:
Ground plane;
The first radiating element, it comprises feeding portion and coupling part, this feeding portion electrical connection signal source; And
The second radiating element, this second radiating element is around the above-mentioned coupling part of part, and the second radiating element comprises:
Short-circuit end, it is electrically connected above-mentioned ground plane; And
Switch unit, it is optionally electrically connected above-mentioned short-circuit end and above-mentioned ground plane.
2. frequency-modulated antenna according to claim 1, is characterized in that, also comprises:
The 3rd radiating element, it has turning point, and the 3rd radiating element and described the first radiating element electrical connection.
3. frequency-modulated antenna according to claim 1, is characterized in that, described the second radiating element and described coupling part common definition the first coupling space and the second coupling space.
4. frequency-modulated antenna according to claim 1, is characterized in that, described short-circuit end is electrically connected described ground plane by short dot, and described short-circuit end comprises coupling element, and this coupling element is placed between above-mentioned short dot and described switch unit.
5. frequency-modulated antenna according to claim 1, is characterized in that, also comprises:
Matching network, it is electrically connected described the first radiating element and described signal source.
6. frequency-modulated antenna according to claim 5, is characterized in that, described matching network comprises:
The first match circuit;
The second match circuit;
The first switching device, it is electrically connected described signal source, and is selectively electrically connected above-mentioned the first match circuit or above-mentioned the second match circuit; And
The second switching device, it is electrically connected described the first radiating element, and is selectively electrically connected above-mentioned the first match circuit or above-mentioned the second match circuit.
7. frequency-modulated antenna according to claim 1, is characterized in that, also comprises:
The 4th radiating element, it is electrically connected described the second radiating element.
8. frequency-modulated antenna according to claim 7, is characterized in that, some of described the second radiating elements are placed between described the 4th radiating element and described the first radiating element.
9. frequency-modulated antenna according to claim 1, is characterized in that, also comprises:
The 5th radiating element, it is electrically connected described the second radiating element, the common definition of described the second radiating element and described coupling part the first coupling space, and the described coupling part of described the first radiating element has groove, above-mentioned the 5th radiating element of part is positioned at above-mentioned groove, jointly to define the 3rd coupling space with described coupling part, above-mentioned the 3rd coupling space is less than described the first coupling space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361773161P | 2013-03-06 | 2013-03-06 | |
| US61/773,161 | 2013-03-06 |
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| Publication Number | Publication Date |
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| CN104037502A true CN104037502A (en) | 2014-09-10 |
| CN104037502B CN104037502B (en) | 2016-07-13 |
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| CN201310746492.4A Active CN104037502B (en) | 2013-03-06 | 2013-12-25 | Frequency-modulated antenna |
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| CN (1) | CN104037502B (en) |
| TW (1) | TWI536665B (en) |
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| CN104810607A (en) * | 2015-04-08 | 2015-07-29 | 广东欧珀移动通信有限公司 | Antenna |
| CN105514569A (en) * | 2014-09-23 | 2016-04-20 | 联想(北京)有限公司 | Electronic device |
| CN106159422A (en) * | 2015-04-08 | 2016-11-23 | 智易科技股份有限公司 | Printed coupled feed-in multi-frequency antenna and electronic system |
| CN106816707A (en) * | 2015-11-30 | 2017-06-09 | 深圳富泰宏精密工业有限公司 | Electronic installation |
| CN108270075A (en) * | 2016-12-30 | 2018-07-10 | 鸿富锦精密电子(郑州)有限公司 | The electronic device of multiband antenna and the application antenna |
| CN108631041A (en) * | 2018-04-25 | 2018-10-09 | Oppo广东移动通信有限公司 | Antenna module and electronic device |
| AU2020204168B2 (en) * | 2019-07-03 | 2021-07-01 | Arcadyan Technology Corporation | Rectangular Triple-Band Antenna Device |
| CN113594678A (en) * | 2021-07-30 | 2021-11-02 | 维沃移动通信有限公司 | Antenna device and electronic apparatus |
| CN114552170A (en) * | 2020-11-25 | 2022-05-27 | 瑞昱半导体股份有限公司 | Wireless communication device and printed dual-band antenna thereof |
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| CN109449611B (en) * | 2018-11-01 | 2020-10-27 | 英华达（上海）科技有限公司 | Parasitic monopole multi-frequency adjustable-frequency antenna system |
| TWI686995B (en) * | 2018-12-05 | 2020-03-01 | 啓碁科技股份有限公司 | Antenna structure and mobile device |
| TWI713259B (en) * | 2019-12-05 | 2020-12-11 | 和碩聯合科技股份有限公司 | Antenna structure |
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| CN105514569A (en) * | 2014-09-23 | 2016-04-20 | 联想(北京)有限公司 | Electronic device |
| CN106159422A (en) * | 2015-04-08 | 2016-11-23 | 智易科技股份有限公司 | Printed coupled feed-in multi-frequency antenna and electronic system |
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| CN108270075A (en) * | 2016-12-30 | 2018-07-10 | 鸿富锦精密电子(郑州)有限公司 | The electronic device of multiband antenna and the application antenna |
| CN108631041A (en) * | 2018-04-25 | 2018-10-09 | Oppo广东移动通信有限公司 | Antenna module and electronic device |
| AU2020204168B2 (en) * | 2019-07-03 | 2021-07-01 | Arcadyan Technology Corporation | Rectangular Triple-Band Antenna Device |
| TWI779212B (en) * | 2019-07-03 | 2022-10-01 | 智易科技股份有限公司 | Rectangular triple-band antenna device |
| CN114552170A (en) * | 2020-11-25 | 2022-05-27 | 瑞昱半导体股份有限公司 | Wireless communication device and printed dual-band antenna thereof |
| CN113594678A (en) * | 2021-07-30 | 2021-11-02 | 维沃移动通信有限公司 | Antenna device and electronic apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104037502B (en) | 2016-07-13 |
| TW201436368A (en) | 2014-09-16 |
| TWI536665B (en) | 2016-06-01 |
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