EP2775562B1 - Communication device and antenna element therein - Google Patents
Communication device and antenna element therein Download PDFInfo
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- EP2775562B1 EP2775562B1 EP13168114.0A EP13168114A EP2775562B1 EP 2775562 B1 EP2775562 B1 EP 2775562B1 EP 13168114 A EP13168114 A EP 13168114A EP 2775562 B1 EP2775562 B1 EP 2775562B1
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- Prior art keywords
- antenna element
- switch
- communication device
- antenna
- band
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/06—Details
- H01Q9/14—Length of element or elements adjustable
- H01Q9/145—Length of element or elements adjustable by varying the electrical length
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the disclosure generally relates to a communication device, and more particularly, relates to a communication device comprising a reconfigurable dual-feed ground plane antenna element.
- mobile communication devices With fast development in the wireless communication industry, functions of mobile communication devices have become more progressive in order to meet a variety of user requirements. Generally, mobile communication devices should be thin, but must also include many components. It is a critical challenge for antenna designers to design antenna elements with more functions and improved performance, with smaller available space in mobile communication devices.
- WO 2011/021027 A2 describes an antenna arrangement comprising an electrically conductive radiating element having first and second ends, an electrically conductive ground plane or ground member, and an input terminal.
- the radiating element has a plurality of separate feed points at different locations between its first and second ends, and the input terminal is provided with a switch.
- Each feed point is electrically connected to the switch by way of a separate electrical pathway, the switch being configured to allow the separate feed points to be connected individually or in predetermined combinations to the input terminal by selecting between a plurality of selectable contacts.
- At least one of the electrical pathways includes a capacitive circuit component connected in series, and at least one other of the electrical pathways includes an inductive circuit component connected in series.
- the antenna arrangement allows for a high degree of customization and improved matching, and enables good multi-band performance.
- WO 01/31732 A1 describes an antenna device for transmitting and receiving radio waves, connectable to a radio communication device, and comprising transmitter and receiver sections.
- the receiver section includes a receiving antenna structure switchable between a plurality of antenna configuration states, each of which is distinguished by a set of radiation related parameters, such as resonance frequency, impedance, radiation pattern, polarization and bandwidth, and a switching device for selectively switching said antenna structure between said plurality of antenna configuration states.
- the antenna device comprises further a receiving means for receiving a first measure representing the reflection coefficient in the transmitter section, and a control device for controlling the switching device of said receiver section, and thus the selective switching of the antenna structure between said plurality of antenna configuration states, in dependence on said first received measure representing the reflection coefficient.
- JP 2012 256 999 describes a first antenna element, a second antenna element, and a MEMS (micro-electromechanical system) switch are provided, and a feeding point is provided at one end of the first antenna element.
- the other end of the first antenna element is connected to a first terminal of the MEMS switch, and one end of the second antenna element is connected to a second terminal of the MEMS switch.
- the one end of the first antenna element is grounded to a ground pattern via an inductor, and a ground terminal of the MEMS switch is connected to the other end of the first antenna element.
- the invention is aimed to provide a communication device and a reconfigurable dual-feed ground plane antenna element therein, according to independent claim 1.
- the ground plane antenna element mainly comprises an antenna element and a ground element in the communication device.
- the antenna element comprises a first portion and a second portion.
- a switch is disposed between the first portion and the second portion such that the antenna element can have a combination of different resonant current paths.
- the switch is further configured to control the antenna element to excite a plurality of different resonant modes. Accordingly, the antenna element is capable of operating in the multiple bands.
- the total length of the first portion and the second portion is smaller than 0.15 wavelength of the lowest frequency of the operating bands of the antenna element. In other words, the total length of the antenna element of the invention is much smaller than the 0.25 wavelength required by a conventional antenna element, thereby allowing the antenna size to be decreased.
- the invention provides a communication device, comprising: a ground element; and an antenna element, disposed adjacent to the ground element, and not overlapping with the ground element, wherein the antenna element comprises: a first portion, having a first end and a second end, wherein the first end is used as a first feeding point of the antenna element; and a second portion, having a third end and a fourth end, wherein the third end is used as a second feeding point of the antenna element, and the fourth end is open.
- a first switch is coupled between the second end of the first portion and the third end of the second portion, and the first switch is further coupled through the first portion and a first reactive circuit to a communication module.
- a second switch is coupled to the third end of the second portion, and the second switch is further coupled through a second reactive circuit to the communication module.
- the antenna element substantially extends along a first edge of the ground element or along two adjacent edges of the ground element. In some embodiments, the antenna element is adjacent to a corner of the ground element.
- the second portion substantially extends along a first edge of the ground element, and the first portion substantially extends along a second edge of the ground element. The first edge is adjacent and perpendicular to the second edge.
- the antenna element When the first switch is closed and the second switch is open, the antenna element receives input energy through the first feeding point and operates in a first band. In some embodiments, when the second switch is closed and the first switch is open, the antenna element receives input energy through the second feeding point and operates in a second band. In some embodiments, the first band is approximately from 704MHz to 960MHz, and the second band is approximately from 1710MHz to 2690MHz.
- the first portion of the antenna element substantially has an L-shape or a straight-line shape. In some embodiments, the second portion of the antenna element substantially has an L-shape or a straight-line shape.
- the antenna element and the ground element form an asymmetry dipole antenna structure.
- the different feeding points of the antenna element are selectively coupled to a signal source by controlling the switches.
- the antenna element can use a combination of the first portion and the second portion or only the second portion to obtain different resonant current paths.
- the antenna element can further control the different resonant modes to be excited. More particularly, the antenna element can operate in multiple bands as follows. When the first switch is closed and the second switch is open, the antenna element resonates by using the combination of the first portion and the second portion.
- the first reactive circuit provides a first impedance value such that the antenna element resonates in the first band.
- the total length of the first portion and the second portion is smaller than 0.15 wavelength of the lowest frequency of the first band.
- the antenna element generates a resonant mode to cover a lower band thereof.
- the antenna element resonates by using only the second portion.
- the second reactive circuit provides a second impedance value such that the antenna element resonates in the second band.
- the length of the second portion is smaller than 0.15 wavelength of the lowest frequency of the second band. In this case, the antenna element generates another resonant mode to cover a higher band thereof.
- the antenna element substantially has a planar structure and has a total area of about 300mm 2 (10mm by 30mm).
- the antenna element can switch between a lower band and a higher band.
- the lower band can cover LTE700/GSM850/900 bands
- the higher band can cover GSM1800/1900/UMTS/LTE2300/2500 bands.
- the antenna element can cover the first band which is approximately from 704MHz to 960MHz and the second band which is approximately from 1710MHz to 2690MHz to achieve LTE/WWAN (Long Term Evolution / Wireless Wide Area Network) multi-band operations.
- LTE/WWAN Long Term Evolution / Wireless Wide Area Network
- FIG. 1 is a diagram for illustrating a communication device 100 according to a first embodiment of the invention.
- the communication device 100 may be a smart phone, a tablet computer, or a notebook computer.
- the communication device 100 at least comprises a ground element 10 and an antenna element 11.
- the antenna element 11 substantially extends along a first edge 101 of the ground element 10.
- the ground element 10 may be a metal plane disposed on a dielectric substrate (not shown), such as an FR4 substrate or a system circuit board.
- the antenna element 11 is disposed adjacent to the ground element 10, and does not overlap with the ground element 10.
- the antenna element 11 comprises a first portion 12 and a second portion 13.
- the first portion 12 substantially has an L-shape
- the second portion 13 substantially has a straight-line shape.
- any of the first portion 12 and the second portion 13 may substantially have a straight-line shape, an L-shape, a J-shape, a U-shape, a W-shape, or an S-shape.
- the first portion 12 has a first end 121 and a second end 122.
- the first end 121 is used as a first feeding point of the antenna element 11.
- the second portion 13 has a third end 131 and a fourth end 132.
- the third end 131 is used as a second feeding point of the antenna element 11, and the fourth end 132 is open.
- a first switch 14 is coupled between the second end 122 of the first portion 12 and the third end 131 of the second portion 13.
- the first switch 14 is further coupled through the first portion 12 and a first reactive circuit 16 to a communication module 18.
- a second switch 15 is coupled to the third end 131 of the second portion 13.
- the second switch 15 is further coupled through a second reactive circuit 17 to the communication module 18.
- the first reactive circuit 16 provides a first impedance value
- the second reactive circuit 17 provides a second impedance value.
- the first impedance value may be different from the second impedance value.
- each of the first reactive circuit 16 and the second reactive circuit 17 comprises one or more inductors and capacitors, such as chip inductors and chip capacitors.
- the communication module 18 is considered as a signal source of the antenna element 11.
- the antenna element 11 selects the first feeding point or the second feeding point to receive input energy from the signal source to operate in different bands.
- the types of the first switch 14 and the second switch 15 are not limitations of the invention.
- each of the first switch 14 and the second switch 15 may be implemented using a PIN diode.
- the communication device 100 further comprises a control unit (not shown). The control unit selectively closes and opens any of the first switch 14 and the second switch 15 according to a user input signal or a detection signal.
- the communication device 100 further comprises a sensor (not shown). The sensor detects a frequency of an electromagnetic signal nearby and accordingly generates the detection signal.
- the communication device 100 may further comprise other components, such as a touch panel, a processor, a speaker, a battery, and a housing (not shown).
- FIG. 2 is a diagram for illustrating return loss of the antenna element 11 receiving input energy through the first feeding point (the first end 121 of the first portion 12) according to the first embodiment of the invention.
- the total area of the ground element 10 is approximately equal to 15000mm 2 (100mm by 150mm) which is consistent with a typical size of a ground element of a tablet computer, and the total area of the antenna element 11 is merely approximately equal to 300mm 2 (10mm by 30mm).
- the antenna element 11 resonates by using a combination of the first portion 12 and the second portion 13 to form a first band 21.
- the first band 21 covers the LTE700/GSM850/900 bands (from about 704MHz to about 960MHz).
- the total length of the first portion 12 and the second portion 13 is smaller than 0.15 wavelength of the lowest frequency in the first band 21.
- FIG. 3 is a diagram for illustrating return loss of the antenna element 11 receiving input energy through the second feeding point (the third end 131 of the second portion 13) according to the first embodiment of the invention.
- the antenna element 11 resonates by using only the second portion 13 to form a second band 31.
- the second band 31 covers the GSM1800/1900/UMTS/LTE2300/2500 bands (from about 1710MHz to about 2690MHz).
- the length of the second portion 13 is smaller than 0.15 wavelength of the lowest frequency in the second band 31.
- FIG. 4 is a diagram for illustrating antenna efficiency of the antenna element 11 receiving input energy through the first feeding point according to the first embodiment of the invention.
- the first switch 14 is closed and the second switch 15 is open.
- the antenna efficiency curve 41 represents the antenna efficiency of the antenna element 11 operating in the LTE700/GSM850/900 bands. According to the results, it is understood that the antenna element 11 has good antenna efficiency (return losses included) in the LTE700/GSM850/900 bands and meets current application requirements.
- FIG. 5 is a diagram for illustrating antenna efficiency of the antenna element 11 receiving input energy through the second feeding point according to the first embodiment of the invention.
- the second switch 15 is closed and the first switch 14 is open.
- the antenna efficiency curve 51 represents the antenna efficiency of the antenna element 11 operating in the GSM1800/1900/UMTS/LTE2300/2500 bands. According to the result, it is understood that the antenna element 11 has good antenna efficiency (return losses included) over GSM1800/1900/UMTS/LTE2300/2500 bands and meets current application requirements.
- FIG. 6 is a diagram for illustrating a communication device 600 according to a second embodiment of the invention.
- an antenna element 61 is disposed adjacent to a corner of the ground element 10, and substantially extends along two adjacent edges of the ground element 10 to save the internal design space of the communication device 600.
- a first portion 62 of the antenna element 61 substantially has an L-shape
- a second portion 63 of the antenna element 61 also substantially has an L-shape.
- Other features of the second embodiment are similar to those of the first embodiment. Accordingly, the two embodiments can achieve similar performances.
- FIG. 7 is a diagram for illustrating a communication device 700 according to a third embodiment of the invention.
- an antenna element 71 is disposed adjacent to a corner of the ground element 10.
- a second portion 73 of the antenna element 71 substantially extends along a first edge 101 of the ground element 10
- a first portion 72 of the antenna element 71 substantially extends along a second edge 102 of the ground element 10 to save the internal design space of the communication device 700.
- the first edge 101 is adjacent and perpendicular to the second edge 102.
- the first portion 72 of the antenna element 71 substantially has a straight-line shape
- the second portion 73 of the antenna element 61 also substantially has a straight-line shape.
- Other features of the third embodiment are similar to those of the first embodiment. Accordingly, the two embodiments can achieve similar performances.
Description
- The disclosure generally relates to a communication device, and more particularly, relates to a communication device comprising a reconfigurable dual-feed ground plane antenna element.
- With fast development in the wireless communication industry, functions of mobile communication devices have become more progressive in order to meet a variety of user requirements. Generally, mobile communication devices should be thin, but must also include many components. It is a critical challenge for antenna designers to design antenna elements with more functions and improved performance, with smaller available space in mobile communication devices.
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WO 2011/021027 A2 describes an antenna arrangement comprising an electrically conductive radiating element having first and second ends, an electrically conductive ground plane or ground member, and an input terminal. The radiating element has a plurality of separate feed points at different locations between its first and second ends, and the input terminal is provided with a switch. Each feed point is electrically connected to the switch by way of a separate electrical pathway, the switch being configured to allow the separate feed points to be connected individually or in predetermined combinations to the input terminal by selecting between a plurality of selectable contacts. At least one of the electrical pathways includes a capacitive circuit component connected in series, and at least one other of the electrical pathways includes an inductive circuit component connected in series. The antenna arrangement allows for a high degree of customization and improved matching, and enables good multi-band performance. -
WO 01/31732 A1 -
JP 2012 256 999 - Accordingly, there is a need to design a novel mobile communication device comprising a small antenna to solve the problem of very limited space for accommodating antenna elements.
- The invention is aimed to provide a communication device and a reconfigurable dual-feed ground plane antenna element therein, according to independent claim 1. The ground plane antenna element mainly comprises an antenna element and a ground element in the communication device. The antenna element comprises a first portion and a second portion. A switch is disposed between the first portion and the second portion such that the antenna element can have a combination of different resonant current paths. The switch is further configured to control the antenna element to excite a plurality of different resonant modes. Accordingly, the antenna element is capable of operating in the multiple bands. The total length of the first portion and the second portion is smaller than 0.15 wavelength of the lowest frequency of the operating bands of the antenna element. In other words, the total length of the antenna element of the invention is much smaller than the 0.25 wavelength required by a conventional antenna element, thereby allowing the antenna size to be decreased.
- In a preferred embodiment, the invention provides a communication device, comprising: a ground element; and an antenna element, disposed adjacent to the ground element, and not overlapping with the ground element, wherein the antenna element comprises: a first portion, having a first end and a second end, wherein the first end is used as a first feeding point of the antenna element; and a second portion, having a third end and a fourth end, wherein the third end is used as a second feeding point of the antenna element, and the fourth end is open. A first switch is coupled between the second end of the first portion and the third end of the second portion, and the first switch is further coupled through the first portion and a first reactive circuit to a communication module. A second switch is coupled to the third end of the second portion, and the second switch is further coupled through a second reactive circuit to the communication module.
- In some embodiments, the antenna element substantially extends along a first edge of the ground element or along two adjacent edges of the ground element. In some embodiments, the antenna element is adjacent to a corner of the ground element. The second portion substantially extends along a first edge of the ground element, and the first portion substantially extends along a second edge of the ground element. The first edge is adjacent and perpendicular to the second edge.
- When the first switch is closed and the second switch is open, the antenna element receives input energy through the first feeding point and operates in a first band. In some embodiments, when the second switch is closed and the first switch is open, the antenna element receives input energy through the second feeding point and operates in a second band. In some embodiments, the first band is approximately from 704MHz to 960MHz, and the second band is approximately from 1710MHz to 2690MHz.
- In some embodiments, the first portion of the antenna element substantially has an L-shape or a straight-line shape. In some embodiments, the second portion of the antenna element substantially has an L-shape or a straight-line shape.
- In the invention, the antenna element and the ground element form an asymmetry dipole antenna structure. The different feeding points of the antenna element are selectively coupled to a signal source by controlling the switches. The antenna element can use a combination of the first portion and the second portion or only the second portion to obtain different resonant current paths. The antenna element can further control the different resonant modes to be excited. More particularly, the antenna element can operate in multiple bands as follows. When the first switch is closed and the second switch is open, the antenna element resonates by using the combination of the first portion and the second portion. In addition, the first reactive circuit provides a first impedance value such that the antenna element resonates in the first band. The total length of the first portion and the second portion is smaller than 0.15 wavelength of the lowest frequency of the first band. In this case, the antenna element generates a resonant mode to cover a lower band thereof. When the second switch is closed and the first switch is open, the antenna element resonates by using only the second portion. In addition, the second reactive circuit provides a second impedance value such that the antenna element resonates in the second band. The length of the second portion is smaller than 0.15 wavelength of the lowest frequency of the second band. In this case, the antenna element generates another resonant mode to cover a higher band thereof.
- In some embodiments, the antenna element substantially has a planar structure and has a total area of about 300mm2 (10mm by 30mm). In some embodiments, the antenna element can switch between a lower band and a higher band. The lower band can cover LTE700/GSM850/900 bands, and the higher band can cover GSM1800/1900/UMTS/LTE2300/2500 bands. In other words, the antenna element can cover the first band which is approximately from 704MHz to 960MHz and the second band which is approximately from 1710MHz to 2690MHz to achieve LTE/WWAN (Long Term Evolution / Wireless Wide Area Network) multi-band operations.
- The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
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FIG. 1 is a diagram for illustrating a communication device according to a first embodiment of the invention; -
FIG. 2 is a diagram for illustrating return loss of an antenna element receiving input energy through a first feeding point according to a first embodiment of the invention; -
FIG. 3 is a diagram for illustrating return loss of an antenna element receiving input energy through a second feeding point according to a first embodiment of the invention; -
FIG. 4 is a diagram for illustrating antenna efficiency of an antenna element receiving input energy through a first feeding point according to a first embodiment of the invention; -
FIG. 5 is a diagram for illustrating antenna efficiency of an antenna element receiving input energy through a second feeding point according to a first embodiment of the invention; -
FIG. 6 is a diagram for illustrating a communication device according to a second embodiment of the invention; and -
FIG. 7 is a diagram for illustrating a communication device according to a third embodiment of the invention. - In order to illustrate the foregoing and other purposes, features and advantages of the invention, the embodiments and figures thereof in the invention are described in detail as follows.
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FIG. 1 is a diagram for illustrating acommunication device 100 according to a first embodiment of the invention. Thecommunication device 100 may be a smart phone, a tablet computer, or a notebook computer. As shown inFIG. 1 , thecommunication device 100 at least comprises aground element 10 and anantenna element 11. Theantenna element 11 substantially extends along afirst edge 101 of theground element 10. Theground element 10 may be a metal plane disposed on a dielectric substrate (not shown), such as an FR4 substrate or a system circuit board. Theantenna element 11 is disposed adjacent to theground element 10, and does not overlap with theground element 10. Theantenna element 11 comprises afirst portion 12 and asecond portion 13. In the embodiment, thefirst portion 12 substantially has an L-shape, and thesecond portion 13 substantially has a straight-line shape. However, the invention is not limited to the above. In other embodiments, any of thefirst portion 12 and thesecond portion 13 may substantially have a straight-line shape, an L-shape, a J-shape, a U-shape, a W-shape, or an S-shape. Thefirst portion 12 has afirst end 121 and a second end 122. Thefirst end 121 is used as a first feeding point of theantenna element 11. Thesecond portion 13 has a third end 131 and afourth end 132. The third end 131 is used as a second feeding point of theantenna element 11, and thefourth end 132 is open. Afirst switch 14 is coupled between the second end 122 of thefirst portion 12 and the third end 131 of thesecond portion 13. Thefirst switch 14 is further coupled through thefirst portion 12 and a firstreactive circuit 16 to acommunication module 18. Asecond switch 15 is coupled to the third end 131 of thesecond portion 13. Thesecond switch 15 is further coupled through a secondreactive circuit 17 to thecommunication module 18. The firstreactive circuit 16 provides a first impedance value, and the secondreactive circuit 17 provides a second impedance value. The first impedance value may be different from the second impedance value. In some embodiments, each of the firstreactive circuit 16 and the secondreactive circuit 17 comprises one or more inductors and capacitors, such as chip inductors and chip capacitors. Thecommunication module 18 is considered as a signal source of theantenna element 11. By controlling thefirst switch 14 and thesecond switch 15, theantenna element 11 selects the first feeding point or the second feeding point to receive input energy from the signal source to operate in different bands. The types of thefirst switch 14 and thesecond switch 15 are not limitations of the invention. For example, each of thefirst switch 14 and thesecond switch 15 may be implemented using a PIN diode. In some embodiments, thecommunication device 100 further comprises a control unit (not shown). The control unit selectively closes and opens any of thefirst switch 14 and thesecond switch 15 according to a user input signal or a detection signal. In some embodiments, thecommunication device 100 further comprises a sensor (not shown). The sensor detects a frequency of an electromagnetic signal nearby and accordingly generates the detection signal. Note that thecommunication device 100 may further comprise other components, such as a touch panel, a processor, a speaker, a battery, and a housing (not shown). -
FIG. 2 is a diagram for illustrating return loss of theantenna element 11 receiving input energy through the first feeding point (thefirst end 121 of the first portion 12) according to the first embodiment of the invention. In the embodiment, the total area of theground element 10 is approximately equal to 15000mm2 (100mm by 150mm) which is consistent with a typical size of a ground element of a tablet computer, and the total area of theantenna element 11 is merely approximately equal to 300mm2 (10mm by 30mm). When thefirst switch 14 is closed and thesecond switch 15 is open, theantenna element 11 resonates by using a combination of thefirst portion 12 and thesecond portion 13 to form afirst band 21. In a preferred embodiment, thefirst band 21 covers the LTE700/GSM850/900 bands (from about 704MHz to about 960MHz). In the embodiment, the total length of thefirst portion 12 and thesecond portion 13 is smaller than 0.15 wavelength of the lowest frequency in thefirst band 21. -
FIG. 3 is a diagram for illustrating return loss of theantenna element 11 receiving input energy through the second feeding point (the third end 131 of the second portion 13) according to the first embodiment of the invention. When thesecond switch 15 is closed and thefirst switch 14 is open, theantenna element 11 resonates by using only thesecond portion 13 to form asecond band 31. In a preferred embodiment, thesecond band 31 covers the GSM1800/1900/UMTS/LTE2300/2500 bands (from about 1710MHz to about 2690MHz). In the embodiment, the length of thesecond portion 13 is smaller than 0.15 wavelength of the lowest frequency in thesecond band 31. -
FIG. 4 is a diagram for illustrating antenna efficiency of theantenna element 11 receiving input energy through the first feeding point according to the first embodiment of the invention. In the embodiment, thefirst switch 14 is closed and thesecond switch 15 is open. As shown inFIG. 4 , theantenna efficiency curve 41 represents the antenna efficiency of theantenna element 11 operating in the LTE700/GSM850/900 bands. According to the results, it is understood that theantenna element 11 has good antenna efficiency (return losses included) in the LTE700/GSM850/900 bands and meets current application requirements. -
FIG. 5 is a diagram for illustrating antenna efficiency of theantenna element 11 receiving input energy through the second feeding point according to the first embodiment of the invention. In the embodiment, thesecond switch 15 is closed and thefirst switch 14 is open. As shown inFIG. 5 , theantenna efficiency curve 51 represents the antenna efficiency of theantenna element 11 operating in the GSM1800/1900/UMTS/LTE2300/2500 bands. According to the result, it is understood that theantenna element 11 has good antenna efficiency (return losses included) over GSM1800/1900/UMTS/LTE2300/2500 bands and meets current application requirements. -
FIG. 6 is a diagram for illustrating acommunication device 600 according to a second embodiment of the invention. In the second embodiment, anantenna element 61 is disposed adjacent to a corner of theground element 10, and substantially extends along two adjacent edges of theground element 10 to save the internal design space of thecommunication device 600. In the second embodiment, afirst portion 62 of theantenna element 61 substantially has an L-shape, and asecond portion 63 of theantenna element 61 also substantially has an L-shape. Other features of the second embodiment are similar to those of the first embodiment. Accordingly, the two embodiments can achieve similar performances. -
FIG. 7 is a diagram for illustrating acommunication device 700 according to a third embodiment of the invention. In the third embodiment, anantenna element 71 is disposed adjacent to a corner of theground element 10. Asecond portion 73 of theantenna element 71 substantially extends along afirst edge 101 of theground element 10, and afirst portion 72 of theantenna element 71 substantially extends along asecond edge 102 of theground element 10 to save the internal design space of thecommunication device 700. Thefirst edge 101 is adjacent and perpendicular to thesecond edge 102. In the third embodiment, thefirst portion 72 of theantenna element 71 substantially has a straight-line shape, and thesecond portion 73 of theantenna element 61 also substantially has a straight-line shape. Other features of the third embodiment are similar to those of the first embodiment. Accordingly, the two embodiments can achieve similar performances. - Note that the above element sizes, element shapes, and frequency ranges are not limitations of the invention. An antenna designer can adjust these setting values according to different requirements.
- Use of ordinal terms such as "first", "second", "third", etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements.
Claims (9)
- A communication device (100), comprising:a communication module (18);a ground element (10); andan antenna element (11), disposed adjacent to the ground element (10), and not overlapping with the ground element (10), wherein the antenna element (11) comprises:a first portion (12), having a first end (121) and a second end (122), wherein the first end (121) is used as a first feeding point of the antenna element (11); anda second portion (13), having a third end (131) and a fourth end (132), wherein the third end (131) is used as a second feeding point of the antenna element (11), and the fourth end (132) is open,wherein a first switch (14) is coupled between the second end (122) of the first portion (12) and the third end (131) of the second portion (13), the first switch (14) is further coupled through the first portion (12) and a first reactive circuit (16) to the communication module (18), a second switch (15) is coupled to the third end (131) of the second portion (13), and the second switch (15) is further coupled through a second reactive circuit (17) to the communication module (18);
wherein the first end (121) is coupled through the first reactive circuit (16) to the communication module (18);
wherein when the first switch (14) is closed and the second switch (15) is open, the antenna element (11) receives input energy through the first feeding point and operates in a first band (21); and
wherein a total length of the first portion (12) and the second portion (13) is smaller than 0.15 wavelength of the lowest frequency in the first band (21). - The communication device as claimed in claim 1, wherein the antenna element (11) substantially extends along a first edge (101) of the ground element (10).
- The communication device as claimed in claim 1, wherein the antenna element (11) is disposed adjacent to a corner of the ground element (10), the second portion (13) substantially extends along a first edge (101) of the ground element (10), the first portion (12) substantially extends along a second edge (102) of the ground element (10), and the first edge (101) is adjacent and perpendicular to the second edge (102).
- The communication device as claimed in claim 1, wherein when the second switch (15) is closed and the first switch (14) is open, the antenna element (11) receives input energy through the second feeding point and operates in a second band (31).
- The communication device as claimed in claim 4, wherein the first band (21) is approximately from 704MHz to 960MHz, and the second band (31) is approximately from 1710MHz to 2690MHz.
- The communication device as claimed in claim 4, wherein a length of the second portion is smaller than 0.15 wavelength of the lowest frequency in the second band (31).
- The communication device as claimed in claim 1, wherein the first portion (12) substantially.has an L-shape or a straight-line shape.
- The communication device as claimed in claim 1, wherein the second portion (13) substantially has an L-shape or a straight-line shape.
- The communication device as claimed in claim 1, wherein the antenna element (11) substantially extends along two adjacent edges of the ground element (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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TW102108180A TWI511371B (en) | 2013-03-08 | 2013-03-08 | Communication device |
Publications (2)
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EP2775562A1 EP2775562A1 (en) | 2014-09-10 |
EP2775562B1 true EP2775562B1 (en) | 2017-02-08 |
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EP13168114.0A Active EP2775562B1 (en) | 2013-03-08 | 2013-05-16 | Communication device and antenna element therein |
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EP (1) | EP2775562B1 (en) |
TW (1) | TWI511371B (en) |
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CN108321495B (en) * | 2018-01-22 | 2020-05-19 | Oppo广东移动通信有限公司 | Antenna assembly, antenna device and electronic equipment |
Family Cites Families (8)
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SE516531C2 (en) * | 1999-10-29 | 2002-01-29 | Allgon Ab | Antenna device switchable between a plurality of configuration states depending on the received quantity and associated method |
CN100373694C (en) * | 2004-02-23 | 2008-03-05 | 启碁科技股份有限公司 | Adjustable wireless communication device and antenna module, and control method |
TWI353688B (en) * | 2008-06-10 | 2011-12-01 | Univ Nat Sun Yat Sen | A multiband mobile communication device antenna |
TW201004030A (en) * | 2008-07-08 | 2010-01-16 | Mitac Int Corp | Antenna system capable of adjusting radiation pattern |
WO2010120218A1 (en) * | 2009-04-15 | 2010-10-21 | Laird Technologies Ab | Multiband antenna device and portable radio communication device comprising such an antenna device |
GB2472779B (en) * | 2009-08-17 | 2013-08-14 | Microsoft Corp | Antennas with multiple feed circuits |
KR101687632B1 (en) * | 2010-05-10 | 2016-12-20 | 삼성전자주식회사 | Re-configurable built-in antenna for portable terminal |
JP2012256999A (en) * | 2011-06-08 | 2012-12-27 | Panasonic Corp | Antenna device |
-
2013
- 2013-03-08 TW TW102108180A patent/TWI511371B/en active
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TW201436358A (en) | 2014-09-16 |
EP2775562A1 (en) | 2014-09-10 |
TWI511371B (en) | 2015-12-01 |
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