TWI626796B - Antenna structure - Google Patents

Abstract

The present invention provides an antenna structure including a feeding portion for feeding a current signal, a high frequency radiating portion, the high frequency radiating portion being electrically connected to the feeding portion, and a low frequency radiating portion, the low frequency radiating portion Electrically connecting with the high-frequency radiation portion; an extension portion electrically connected to the feeding portion and the high-frequency radiation portion; and a switching unit electrically connected to the extension portion for The extension is controlled to be in an open state or a short circuit state.

Description

Antenna structure

The present invention relates to an antenna structure having a wider low frequency band.

With the advent of the 4G era, the transmission rate of mobile communication networks has become faster, but the frequency bands that wireless communication devices need to support have increased more, especially in the low-frequency part, which needs to cover 700-900 MHz. In addition, the size of the current wireless communication device is mostly maximized to the screen, and the size is light and thin. In order to save costs, it is generally desirable to use the same antenna to support all frequency bands. Therefore, how to use the same antenna to support all of the frequency band antenna design challenges is an important issue.

In view of this, it is necessary to provide an antenna structure having a wider low frequency band.

An antenna structure includes: a feeding portion for feeding a current signal; a high frequency radiating portion, the high frequency radiating portion is electrically connected to the feeding portion; and a low frequency radiating portion, the low frequency radiating portion and the The high-frequency radiation portion is electrically connected; the extension portion is electrically connected to the feeding portion and the high-frequency radiation portion; and a switching unit electrically connected to the extension portion for controlling the The extension is in an open state or a short circuit state.

The antenna structure is provided with the extension portion and the switching unit. Thus, by controlling the switching of the switching unit, the extension portion can be controlled to be in a short circuit state or an open circuit state, thereby causing the antenna structure to operate in a corresponding low frequency band, that is, a frequency band of 703-803 MHz and a frequency band of 880-960 MHz. In addition, the antenna structure can also operate in the 1710-2170 MHz frequency band. That is, the antenna structure can be applied to operations of GSM, WCDMA I/II/V/VIII, and LTE Band1/3/8/28 bands.

100‧‧‧Antenna structure

11‧‧‧ Grounding Department

13‧‧‧Feeding Department

15‧‧‧High Frequency Resonance Department

151‧‧‧First Resonance Section

153‧‧‧Secondary resonating section

155‧‧‧ Third Resonant Section

157‧‧‧fourth resonating section

159‧‧‧ fifth resonance section

16‧‧‧High Frequency Radiation Department

161‧‧‧First radiant section

163‧‧‧second radiant section

165‧‧‧third radiant section

17‧‧‧ Low Frequency Radiation Department

171‧‧‧First resonance segment

172‧‧‧second resonance

173‧‧‧3rd resonance section

174‧‧‧fourth resonance section

175‧‧‧ fifth resonance

176‧‧‧ sixth resonance

177‧‧‧ seventh resonance

178‧‧‧ eighth resonance

179‧‧‧ninth resonance section

18‧‧‧Extension

181‧‧‧First extension

182‧‧‧Second extension

183‧‧‧ third extension

184‧‧‧4th extension

185‧‧‧5th extension

186‧‧‧ sixth extension

19‧‧‧Switch unit

191‧‧‧Toggle switch

D1‧‧‧ moving contacts

D2‧‧‧first static contact

D3‧‧‧Second static contact

193‧‧‧Short circuit

195‧‧‧Open circuit

1 is a schematic diagram of an antenna structure in accordance with a preferred embodiment of the present invention.

2 is a circuit diagram of an extension portion and a switching unit in the antenna structure shown in FIG. 1.

3 is a graph showing scattering parameters of the antenna structure shown in FIG. 1.

4 is a graph showing the radiation efficiency of the antenna structure shown in FIG. 1.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without the creative work are all within the scope of the present invention.

It should be noted that when an element is referred to as "electrically connected" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "electrically connected" to another element, it can be a contact connection, for example, a wire connection or a non-contact connection, for example, a non-contact coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. The terminology used in the description of the invention herein is for the purpose of describing the particular embodiments. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below may be combined with each other without conflict.

Referring to FIG. 1, a preferred embodiment of the present invention provides an antenna structure 100, which can be disposed in a wireless communication device (not shown) such as a mobile phone or a personal digital assistant (PDA) for transmitting and receiving. Radio waves to transmit and exchange wireless signals.

The antenna structure 100 can be made of a metal sheet or a flexible printed circuit (FPC). The antenna structure 100 can be adhered to the plastic housing of the wireless communication device by glue or the like. The antenna structure 100 includes a ground portion 11, a feeding portion 13, a high frequency resonance portion 15, a high frequency radiation portion 16, a low frequency radiation portion 17, and an extension portion 18. The grounding portion 11, the feeding portion 13, the high frequency resonating portion 15, the high frequency radiating portion 16, the low frequency radiating portion 17, and the extending portion 18 are all in a sheet shape and are completely disposed in the same plane, that is, coplanar.

In this embodiment, the grounding portion 11 is substantially straight and electrically connected to a grounding point (not shown) mounted on a circuit board (not shown) in the wireless communication device. The antenna structure 100 provides grounding.

The feed portion 13 is substantially straight. In the embodiment, the feeding portion 13 is opposite to the ground portion 11 and disposed parallel to each other, thereby forming a first gap G1 therebetween. The feeding portion 13 can be connected to a signal feeding point on a circuit board in the wireless communication device (not shown) Electrically connected to provide signal feed for the antenna structure 100.

In the embodiment, the high frequency resonating portion 15 is electrically connected to the ground portion 11, and includes a first resonating section 151, a second resonating section 153, a third resonating section 155, a fourth resonating section 157, and a fifth resonance. Paragraph 159. The first resonating section 151 is substantially straight and is vertically connected to one end of the grounding portion 11 and extends in a direction away from the feeding portion 13. The second resonating section 153 is a straight strip-shaped sheet that is vertically connected to an end of the first resonating section 151 away from the grounding portion 11 and extends in a direction parallel and away from the grounding portion 11 to The first resonating section 153 constitutes a substantially L-shaped structure. The third resonating section 155 is substantially straight, and is vertically connected to an end of the second resonating section 153 away from the first resonating section 151, and is parallel to the first resonating section 151 and away from the grounding portion. The direction of 11 extends. That is, the first resonating section 151 and the third resonating section 155 are respectively disposed perpendicularly at opposite ends of the second resonating section 153 and extend in parallel and opposite directions, respectively.

The fourth resonating section 157 is substantially straight and vertically connected to the third resonating section 155 away from one end of the second resonating section 153 and parallel to the second resonating section 153 and away from the grounding portion 11 The direction extends. The fifth resonating section 159 is substantially L-shaped, and is disposed on the same side of the third resonating section 155 as the second resonating section 153. Specifically, one end of the fifth resonating section 159 is perpendicularly connected to the junction of the third resonating section 155 and the fourth resonating section 157, and is parallel to the second resonating section 153 and away from the fourth resonating section. After extending a distance of 157, the angle is bent to extend in a direction parallel to the first resonating section 151 and away from the grounding portion 11.

The high-frequency radiation portion 16 is electrically connected to the feeding portion 13 and spaced apart from the high-frequency resonance portion 15 to form a second gap G2 therebetween. In this embodiment, The second gap G2 is in communication with the first gap G1. The width of the second gap G2 is approximately 0.5 mm. The high frequency radiation portion 16 includes a first radiation segment 161, a second radiation segment 163, and a third radiation segment 165 that are electrically connected in sequence.

The first radiating section 161 is a rectangular sheet body that is vertically connected to the feeding portion 13 near one end of the first resonating section 151 and is parallel to the first resonating section 151 and close to the grounding portion 11 The direction extends. The second radiating section 163 is substantially straight and vertically connected to the first radiating section 161 away from one end of the feeding portion 13 and parallel to the second resonating section 153 and away from the feeding portion 13 The direction extends. The third radiating section 165 is a straight strip-shaped sheet that is vertically connected to the second radiating section 163 away from one end of the first radiating section 161 and is parallel to the first resonating section 151 and away from the The feed portion 13 extends in the direction. That is, the first radiating section 161 and the third radiating section 165 are respectively disposed perpendicularly at opposite ends of the second radiating section 163, and respectively extend in parallel and opposite directions.

The low frequency radiation portion 17 is a sheet having a meander shape which is electrically connected to the high frequency radiation portion 16. The low frequency radiation portion 17 includes a first resonance segment 171, a second resonance segment 172, a third resonance segment 173, a fourth resonance segment 174, a fifth resonance segment 175, a sixth resonance segment 176, and a seventh resonance electrically connected in sequence. Segment 177, eighth resonant segment 178, and ninth resonant segment 179. The first resonating section 171 is substantially straight and vertically connected to a position intermediate the third radiating section 165 and extends in a direction parallel to the grounding portion 11 and away from the high frequency resonating portion 15.

The second resonant section 173 is substantially straight and vertically connected to one end of the first resonant section 171 away from the third radiating section 165, and is parallel to the third radiating section 165 and adjacent to the feeding part 13 The direction extends until it passes over the feed portion 13. The third resonating section 174 is substantially U-shaped and is vertically connected to the second resonating section 173 away from the first resonating section An end portion of the 171 extends in a direction parallel to and adjacent to the feeding portion 13, and then is bent at a right angle to extend in a direction parallel to the second resonance portion 173 and away from the feeding portion 13, and finally bent again A straight angle extends in a direction parallel to the first resonance section 171 and away from the feed portion 13.

The fourth resonating section 175 is a straight strip-shaped sheet that is vertically connected to the end of the third resonating section 174 away from the second resonating section 173, and is parallel to the third radiating section 165 and away from the The direction of the feed portion 13 extends. The fifth resonant section 175 is generally arcuate and electrically connected to the end of the fourth resonant section 175 remote from the third resonant section 174.

The sixth resonating section 176 is a straight strip-shaped sheet electrically connected to the end of the fifth resonating section 175 away from the fourth resonating section 175, and parallel to the third radiating section 165 and away from the The direction of the feed portion 13 extends. The seventh resonating section 177 is substantially arched, and one end thereof is electrically connected to the sixth resonating section 176 away from one end of the fifth resonating section 175.

The eighth resonant section 178 is a straight strip-shaped body electrically connected to the end of the seventh resonating section 177 away from the sixth resonating section 176, and parallel to the third radiating section 165 and away from the The direction of the feed portion 13 extends. The ninth resonating section 179 is substantially arcuate and is vertically connected to the end of the eighth resonating section 178 away from the seventh resonating section 177. In this embodiment, the second resonance segment 172, the fourth resonance segment 174, the sixth resonance segment 176, and the eighth resonance segment 178 are substantially on the same straight line. The first resonance segment 171, the third resonance segment 173, the fifth resonance segment 175, the seventh resonance segment 177, and the ninth resonance segment 179 are located in the second resonance segment 172, the fourth resonance segment 174, and the sixth resonance. The segment 176 and the eighth resonance segment 178 are adjacent to the same side of the feed portion 13.

It can be understood that, in other embodiments, the structure of the low frequency radiating portion 17 is not limited. As described above, the specific structure can also be adjusted according to the components on the carrier (for example, the plastic casing) for carrying the antenna structure 100.

The extension portion 18 is electrically connected to the feed portion 13 and the high frequency radiation portion 16. The extending portion 18 is integrally disposed on a side of the feeding portion 13 away from the ground portion 11 . The extension portion 18 has a meander shape, and includes a first extension portion 181, a second extension portion 182, a third extension portion 183, a fourth extension portion 184, a fifth extension portion 185, and a sixth extension portion 186 which are electrically connected in sequence. The first extension 181 is a straight strip that is vertically connected to the junction of the feed portion 13 and the first radiant section 161 and is parallel to the first resonating section 151 and away from the ground. The direction of the portion 11 and the feeding portion 13 extends. In this embodiment, the first extending section 181 and the first radiating section 161 are respectively located at ends of the feeding portion 13 adjacent to the first resonating section 151, and respectively extend in opposite directions. The width of the first extension 181 is greater than the width of the first radiant section 161.

In this embodiment, the width of the second extension 182 is smaller than the width of the first extension 181. The second extension 182 is electrically connected to the end of the first extension 181 away from the feeding portion 13 and continues to be parallel to the first resonating section 151 and away from the grounding portion 11 and the feeding portion 13 The direction extends.

The third extension 183 is a straight strip that is vertically connected to the end of the second extension 182 away from the first extension 181 and is parallel to the feed portion 13 and away from the low frequency. The direction of the radiation portion 17 extends. That is, the first extension 181 and the third extension 183 are both located on the same side of the second extension 182.

The fourth extension 184 is substantially straight and vertically connected to the end of the third extension 183 away from the second extension 182 and parallel to the second extension 182 And extending away from the grounding portion 11 and the feeding portion 13 in the direction.

The fifth extension 185 is substantially straight and vertically connected to the end of the fourth extension 184 away from the third extension 183, and is parallel to the feed portion 13 and away from the low frequency radiation portion. The direction of 17 extends. The sixth extension 186 is substantially rectangular in shape, and is vertically electrically connected to the end of the fifth extension 185 away from the fourth extension 184, and parallel to the fourth extension 184 and away from the The direction of the feed portion 13 extends.

Referring to FIG. 2 together, the antenna structure 100 further includes a switching unit 19. The switching unit 19 includes a changeover switch 191, a short circuit 193, and an open circuit 195. In the embodiment, the switch 191 is a single-pole double-throw switch, which includes a movable contact D1, a first stationary contact D2, and a second stationary contact D3. The movable contact D1 is electrically connected to the extension portion 18. The first static contact D2 is grounded by the short circuit 193. The second stationary contact D3 is electrically connected to the open circuit 195. Thus, by controlling the switching of the changeover switch 191, the extension portion 18 is switched to electrically connect the short circuit 193 or the open circuit 195, thereby controlling the antenna structure 100 to operate in a corresponding operating frequency band. For example, when the switch 191 is switched to the short circuit 193, the extension 18 is in a short circuit state, that is, the short circuit 193 is grounded, so that the antenna structure 100 operates in the first operating frequency band. When the switch 191 is switched to the open circuit 195, the extension 18 is in an open state, that is, the extension 18 is not grounded, thereby causing the antenna structure 100 to operate in the second operating frequency band. In this embodiment, the first working frequency band is 880-960 MHz. The second operating frequency band is 703-803 MHz.

Please refer to FIG. 3 together, which is a graph of S parameters (scattering parameters) of the antenna structure 100 of the present invention. Where the curve S31 is when the antenna structure 100 operates in the first working frequency band. The S11 value. Curve S32 is the S11 value when the antenna structure 100 operates in the second operating band.

Please refer to FIG. 4 as a graph of the radiation efficiency of the antenna structure 100. The curve S41 is the radiation efficiency when the antenna structure 100 operates in the first working frequency band. Curve S42 is the radiation efficiency of the antenna structure 100 when operating in the second operating band. Obviously, when the antenna structure 100 operates in the 703-803 MHz frequency band or the 880-960 MHz frequency band, its operating frequency can meet the antenna working design requirements and has better radiation efficiency.

It can be understood that in other embodiments, the operating bandwidth of the antenna structure 100 in the high frequency band can be adjusted by adjusting the gap between the ground portion 11 and the feeding portion 13, that is, the width of the first gap G1.

It can be understood that in other embodiments, the impedance bandwidth of the corresponding working frequency band can be excited by adjusting the gap between the high frequency resonating portion 15 and the high frequency radiating portion 16, that is, the width of the second gap G2. For example, the DCS/PCS/WCDMA band, that is, the 1710-2170 MHz band.

It is apparent that the antenna structure 100 of the present invention is provided with the extension portion 18 and the switching unit 19. Thus, by controlling the switching of the switching unit 19, the extension portion 18 can be controlled to be in a short circuit state or an open circuit state, so that the antenna structure 100 operates in a corresponding low frequency band, that is, a frequency band of 703-803 MHz and a frequency band of 880-960 MHz. . In addition, the antenna structure 100 can also operate in the 1710-2170 MHz frequency band. That is, the antenna structure 100 can be applied to operations of the GSM, WCDMA I/II/V/VIII, and LTE Band1/3/8/28 bands.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

Claims (9)

An antenna structure is improved in that the antenna structure includes: a feeding portion for feeding a current signal; a high frequency radiating portion, the high frequency radiating portion is electrically connected to the feeding portion; and a low frequency radiating portion, The low frequency radiation portion is electrically connected to the high frequency radiation portion; the extension portion is electrically connected to the feeding portion and the high frequency radiation portion; the switching unit, the switching unit and the extension portion are electrically a connection for controlling the extension portion to be in an open state or a short circuit state; a ground portion, the ground portion is opposite to the feed portion and disposed in parallel with each other; and a high frequency resonance portion including the first resonance a segment, a second resonating section, a third resonating section, a fourth resonating section, and a fifth resonating section, the first resonating section being vertically connected to one end of the grounding portion and extending in a direction away from the feeding portion The second resonating section is vertically connected to the end of the first resonating section away from the grounding portion and extends in a direction parallel and away from the grounding portion, the third resonating section being vertically connected to the second resonance Duan Yuan An end of the first resonating section extends in a direction parallel to the first resonating section and away from the ground portion, and the fourth resonating section is vertically connected to the third resonating section away from the second resonating One end of the segment and extending in a direction parallel to the second resonating section and away from the ground portion, one end of the fifth resonating section being vertically connected to a junction of the third resonating section and the fourth resonating section And extending a distance along the direction parallel to the second resonating section and away from the fourth resonating section, and extending at a right angle to extend in a direction parallel to the first resonating section and away from the grounding portion. The antenna structure according to claim 1, wherein the feeding portion, the high-frequency radiation portion, the low-frequency radiation portion, and the extending portion are disposed in a coplanar manner. The antenna structure of claim 1, wherein the switching unit comprises a switching switch, a short circuit, and an open circuit, the switch includes a movable contact, a first stationary contact, and a second stationary contact. The movable contact is electrically connected to the extension portion, the first stationary contact is grounded by the short circuit, and the second stationary contact is electrically connected to the open circuit by controlling the switch Switching to switch the extension to the short circuit or the open circuit, thereby controlling the extension to be in the short circuit state or the open circuit state. The antenna structure of claim 1, wherein a first gap is formed between the grounding portion and the feeding portion, and the antenna structure is adjusted to a high frequency band by adjusting a width of the first gap. Operating bandwidth. The antenna structure of claim 4, wherein a second gap is formed between the high frequency resonating portion and the high frequency radiating portion, and the second gap is in communication with the first gap. Adjusting the width of the second gap to excite the impedance bandwidth of the corresponding operating frequency band. The antenna structure of claim 1, wherein the high frequency radiation portion comprises a first radiation segment, a second radiation segment and a third radiation segment connected in series, the first radiation segment being vertically connected to the The feeding portion is adjacent to one end of the first resonating section and extends in a direction parallel to the first resonating section and adjacent to the grounding portion, and the second radiating section is vertically connected to the first radiating section away from the feeding One end of the inlet portion and extending in a direction parallel to the second resonating section and away from the feeding portion, the third radiating section being vertically connected to the second radiating section away from the first One end of the radiant section extends in a direction parallel to the first resonating section and away from the feed portion. The antenna structure of claim 6, wherein the low frequency radiating portion includes a first resonant segment, a second resonant segment, a third resonant segment, a fourth resonant segment, a fifth resonant segment, and a first electrical connection. a sixth resonance section, a seventh resonance section, an eighth resonance section, and a ninth resonance section, the first resonance section being vertically connected to a middle position of the third radiation section, and parallel to the ground portion and away from the height Extending in a direction of the frequency resonating portion, the second resonating section is perpendicularly connected to the first resonating section away from one end of the third radiating section, and extends in a direction parallel to the third radiating section and adjacent to the feeding portion until Crossing the feed portion, the third resonance is perpendicularly connected to the end of the second resonance segment away from the first resonance segment, and extends in a direction parallel to and close to the feed portion, and then bends a right angle, Extending in a direction parallel to the second resonance segment and away from the feeding portion, and finally bending a right angle to extend in a direction parallel to the first resonance segment and away from the feeding portion, the fourth resonance Segment connected vertically to the station The third resonating section is away from the end of the second resonating section and extends in a direction parallel to the third radiating section and away from the feeding portion, and the fifth resonating section is electrically connected to the fourth resonating section Far from the end of the third resonance segment, the sixth resonance segment is electrically connected to the end of the fifth resonance segment away from the fourth resonance segment, and is parallel to the third radiation segment and away from the feed portion Extending in a direction, the seventh resonance segment is electrically connected to the sixth resonance segment away from one end of the fifth resonance segment, and the eighth resonance segment is electrically connected to the seventh resonance segment away from the sixth resonance An end of the segment extending in a direction parallel to the third radiating segment and away from the feeding portion, the ninth resonant segment being vertically connected to an end of the eighth resonant segment away from the seventh resonant segment. The antenna structure of claim 7, wherein the first resonance section is in a straight strip shape, the second resonance section is in a straight strip shape, and the third resonance section is U-shaped, the fourth The resonant section is a straight strip, the fifth resonant section is arcuate, the sixth resonant section is a straight strip, the seventh resonant section is arched, and the eighth resonant section is a strip a sheet body, the ninth resonance section is curved, and the second resonance section, the fourth resonance section, the sixth resonance section and the eighth resonance section are located on a same straight line, the first resonance section and the third resonance section The fifth resonance segment, the seventh resonance segment, and the ninth resonance segment are co-located on the same side of the second resonance segment, the fourth resonance segment, the sixth resonance segment, and the eighth resonance segment. The antenna structure of claim 6, wherein the extension comprises a first extension, a second extension, a third extension, a fourth extension, a fifth extension, and a sixth, which are sequentially electrically connected. An extension of the first extension is perpendicularly connected to the junction of the feed portion and the first radiation segment, and extends in a direction parallel to the first resonance segment and away from the ground portion and the feed portion. The second extension is electrically connected to the end of the first extension away from the feeding portion, and continues to extend in a direction parallel to the first resonating section and away from the ground portion and the feeding portion, the third The extension is vertically connected to the end of the second extension away from the first extension and extends in a direction parallel to the feed portion and away from the low frequency radiation portion, the fourth extension is vertically connected to the The third extension extends away from the end of the second extension and extends in a direction parallel to the second extension and away from the ground portion and the feed portion, the fifth extension being vertically connected to the first portion The four extensions are away from the third extension An end portion of the segment extending in a direction parallel to the feeding portion and away from the low frequency radiation portion, the sixth extension portion being vertically connected to the fifth extension portion away from the An end portion of the fourth extension portion extends in a direction parallel to the fourth extension portion and away from the feed portion.