EP2234207A1 - Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenvorrichtung - Google Patents

Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenvorrichtung Download PDF

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Publication number
EP2234207A1
EP2234207A1 EP09155865A EP09155865A EP2234207A1 EP 2234207 A1 EP2234207 A1 EP 2234207A1 EP 09155865 A EP09155865 A EP 09155865A EP 09155865 A EP09155865 A EP 09155865A EP 2234207 A1 EP2234207 A1 EP 2234207A1
Authority
EP
European Patent Office
Prior art keywords
frequency band
radiating element
unbranched
connection
antenna device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09155865A
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English (en)
French (fr)
Inventor
Andrei Kaikkonen
Per Erlandsson
Axel Von Arbin
Peter Lindberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Laird Technologies AB
Original Assignee
Laird Technologies AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laird Technologies AB filed Critical Laird Technologies AB
Priority to EP09155865A priority Critical patent/EP2234207A1/de
Priority to PCT/SE2010/050295 priority patent/WO2010110722A1/en
Publication of EP2234207A1 publication Critical patent/EP2234207A1/de
Withdrawn legal-status Critical Current

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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means

Definitions

  • the present invention relates generally to antenna devices and more particularly to an antenna device for a portable radio communication device operable in at least a first lower and a second higher frequency band.
  • the invention also relates to a portable radio communication device comprising such an antenna device.
  • Internal antennas have been used for some time in portable radio communication devices. There are a number of advantages connected with using internal antennas, of which can be mentioned that they are small and light, making them suitable for applications wherein size and weight are of importance, such as in mobile phones.
  • the FM radio application is defined as frequencies between 88-108 MHz in most of the world and frequencies between 76-90 MHz in Japan.
  • Prior art conventional antenna configurations, such as loop antennas or monopole antennas, fitted within the casing of a portable radio communication device will result in unsatisfactory operation in that the antenna either has too bad performance over a sufficiently wide frequency band or sufficient performance over a too narrow frequency band.
  • a conventional FM antenna for portable radio communication devices is usually provided in the headset wire connected to the communication device.
  • This configuration with a relatively long wire permits an antenna length that is sufficient also for low frequency applications.
  • this solution is obviously not feasible.
  • a portable radio communication device is today many times provided with frequency operational coverage for other frequency bands than FM, such as GSM900, GSM1800, Bluetooth, WLAN, WCDMA and GPS.
  • a portable radio communication device has limited space and it is thus desirable to, if possible, add multiple functionality to an antenna.
  • the radiating element is then to resonate in more than one frequency band. This is hard to accomplish in a small portable radio communication device.
  • An object of the present invention is to provide a small-sized antenna device that provides improved multiband functionality.
  • Another object is to provide an antenna device that can provide simultaneous multiband functionality.
  • the invention is based on the realization that improved multiband functionality can be obtained in an antenna device by providing a single solid unbranched radiating element having a first and a second opposite end and being arranged to be placed in a plane parallel with and spaced from a ground plane.
  • the antenna device also comprises a first feeding connection to the first end of the single solid unbranched radiating element, a first connection path between the single solid unbranched radiating element and a first frequency band signal handling unit as well as a tuning element connected to the single solid unbranched radiating element. This tuning element tunes the single solid unbranched radiating element for fundamental resonance in the first frequency band.
  • the antenna device further includes a first signal passing and blocking arrangement that allows signals in the first frequency band to pass through the first connection path and blocks signals in the second frequency band from passing through the first connection path.
  • the antenna device also includes a second connection path between the single solid unbranched radiating element and a second frequency band signal handling unit and a second signal passing and blocking arrangement that allows signals in the second frequency band to pass through the second connection path and blocks signals in the first frequency band from passing through the second connection path. At least one of the first and the second connection paths is connected to the first feeding connection.
  • an antenna device as defined in claim 1.
  • the invention has a number of advantages.
  • the single solid unbranched radiating element that provides multiband operation is very small. Multiband operation is furthermore obtained simultaneously. There is no switching between operations in different bands. This has the advantage of providing a more rapid signal processing as well as energy savings.
  • a solid and unbranched radiating element is also simple to produce.
  • Fig. 1 shows a front view of the exterior or casing of a portable radio communication device 10, in the form of a mobile phone.
  • a mobile phone is just an example of one type of portable radio communication device. Other examples are lap top computers, palm top computers, electronic organizers and electronic gaming machines.
  • the portable radio communication device 10 there is an antenna device as well as a circuit board on which frequency band signal handling units are provided. The antenna device is then connected to such frequency band signal handling units as well as to a ground plane. This ground plane is normally provided as a part of the circuit board.
  • Signal handling units are typically implemented through radio circuits arranged to modulate and/or demodulate radio signals and process them. These may be arranged to only transmit, only receive or to both transmit and recive radio signals. These may be FM signal handling units, Bluetooth signal handling units, GPS signal handling units as well as cellular radio signal handling units such as WCDMA RX (diversity) signal handling units.
  • the present invention is directed towards providing simultaneous multiple use of a single radiating element, where the single radiating element is made to resonate in at least a first lower and a second higher frequency band. These bands may with advantage be separated from each other by more than 1 GHz.
  • a solid radiating element is here an element where there are no tuning, matching and switching elements or units provided on the radiating element or between sections of the radiating element.
  • An unbranched element is an element that has no branches.
  • An unbranched radiating element can also be seen as a radiating element having a main radiating body but lacking radiating branches joined to this main body.
  • the lower frequency band may with advantage be an FM frequency band (76 - 108 MHz) and the second a Bluetooth frequency band (2400 - 2482 MHz). However, the second frequency band may also be a GPS band (1575 MHz) or a WCDM RX (diversity) band (2110 - 2170 MHz).
  • fig. 2 schematically shows a perspective view of the antenna device on its own and to fig. 3 , which schematically shows the antenna device above a circuit board and on which frequency band signal handling units are provided. From the drawings it is evident that the antenna device according to the present invention is provided in the interior of the portable radio communication device.
  • the antenna device 12 includes a single solid unbranched radiating antenna element 16 above a circuit board 14 provided with a ground plane (not shown).
  • the ground plane here typically is provided as one layer in the circuit board and occupies as much as possible of the area of the circuit board 14.
  • the radiating element 16 has a first end 18 as well as a second opposite end 20.
  • the radiating element 16 is here provided in a plane that is parallel to the plane of the circuit board 14 and typically stretches along at least two adjacent and here two orthogonal sides of the board that here coincide with corresponding sides of the ground plane. It does furthermore not stretch beyond these corresponding sides of the ground plane. It does not cross any of these sides but stays within a volume defined and bounded by the corresponding ground plane sides.
  • the radiating element 16 in this embodiment stretches straight along a first side of the board 14, whereupon it makes a ninety degree turn at a corner between the first and an orthogonal second side of the board 14 and then stretches along this second side.
  • the radiating element 16 is provided at a distance of 5 mm from the board and it is 100 mm long. It should however be noted that the invention is in no way limited to these dimensions, but these are mere examples of the dimensions of the radiating element.
  • the second end 20 is in this embodiment electrically floating, i.e. it does not have a direct electrical connection to any other elements.
  • the radiating element 16 may in all the embodiments to be described be provided as a wire or conductor and can also be provided on a carrier such as a flex film.
  • the first end 18 here has a first feeding connection FC1 leading to other elements of the antenna device. This connection is typically provided as a conductor which can lead from the plane of the circuit board to the plane in which the radiating element is provided.
  • the antenna device 12 is provided with a first connection path P1 (shown as a dotted bidirectional arrow) that stretches between the radiating element 16 and a first frequency band signal handling unit 34.
  • this path P1 is shown as stretching from the first feeding connection FC1 to the first frequency band signal handling unit 34.
  • a first signal passing and blocking arrangement 22 (indicated with a dashed box).
  • the antenna device 12 of the present invention is also provided with a second connection path P2 (also shown as a dotted bidirectional arrow) that stretches between the radiating element 16 and a second frequency band signal handling unit 32.
  • the second path P2 is in the figures shown as stretching from the first feeding connection FC1 to the second frequency band signal handling unit 32.
  • a second signal passing and blocking arrangement 26 also indicated with a dashed box.
  • the first signal passing and blocking arrangement 22 is here arranged to allow signals in the first frequency band to always pass through the first connection path P1 and to always block signals in the second frequency band from passing through the first connection path, while the second signal passing and blocking arrangement 26 is arranged to always allow signals in the second frequency band to pass through the second connection path P2 and to always block signals in the first frequency band from passing through the second connection path.
  • the first signal passing and blocking arrangement 22 includes a first filter 24 connected between the radiating element 16 and the first frequency band signal handling unit 34.
  • this first filter may be a low pass filter.
  • this first filter 24 is provided in the form of an inductor connected between the radiating element and the first frequency band signal handling unit 34, which inductor in these embodiments has, only as an example, a value of 56 nH.
  • a low pass filter may be realized in other ways.
  • the first filter is not limited to a low pass filter but may also be a band pass filter with the pass band set to cover the first frequency band.
  • the second signal passing and blocking arrangement 26 includes a second filter 28 connected between the radiating element 16 and the second frequency band signal handling unit 32.
  • this second filter may be a high pass filter.
  • this second filter is provided in the form of a capacitor 28 connected between the radiating element 16 and the second frequency band signal handling unit 32, which capacitor in these embodiments has, only as an example, a value of 1 pF.
  • a high pass filter may be realized in other ways.
  • the second filter is not limited to a high pass filter but may also be a band pass filter with the pass band set to cover the second frequency band and any other frequency bands of signals that are to pass the second connection path.
  • the length of the radiating element 16 is according to the invention smaller than the quarter of a wavelength at which fundamental resonance occurs in the first frequency band. Therefore a tuning element T1 is connected to the radiating element 16 and in this embodiment also the first connection path. This tuning element T1 is arranged to tune the single solid unbranched radiating element 16 for fundamental resonance in the first frequency band.
  • the radiating element is a monopole element and more particularly an ILA (Inverted L Antenna) element.
  • ILA Inverted L Antenna
  • the tuning element T1 can be provided as an inductive element connected between the radiating element 16 and ground. In the present example it has a value of 470 nH.
  • the tuning element T1 is here furthermore also connected to the first connection path P1 and then to the connection point between the first filter 24 and the radiating element 16. This also means that in this embodiment it assists in blocking signals in the second frequency band from reaching ground via the first feeding connection FC1.
  • the second filter 28 in the second signal passing and blocking arrangement 26 blocks signals in the first frequency band and allows signals in the second frequency band to pass.
  • This filter 28 may however also be put to further use. It may simultaneously act to match the radiating element 16 for obtaining resonance in the second frequency band. This matching may not be enough, in which case the path P2 may also include a matching network 30 for performing an even better match. In this sense the capacitive filter 28 may also be seen as a part of the matching network 30.
  • both the first and the second paths P1 and P2 are connected to the first feeding connection FC1 and thus both are connected to the first end 18 of the radiating element 16.
  • the tuning element T1 tunes the radiating element for fundamental resonance in the first frequency band, which in this example is the FM band.
  • the second frequency band which in this example is the Bluetooth frequency band
  • the radiating element operates with harmonic resonance.
  • this resonance is obtained through the use of the matching network 30 and second filter 28 in the second signal passing and blocking arrangement 26 for matching the radiating element 16 to harmonic resonance.
  • the whole length of the radiating element is here selected and used for obtaining resonance in both frequency bands.
  • the radiating element may also here operate with fundamental resonance in the second band.
  • Fig. 4 shows a perspective view of an antenna device according to a second embodiment of the present invention being provided above a circuit board in a similar way as in the first embodiment.
  • the radiating element 16 is here provided in the same way in relation to the two connection paths P1 and P2 and the circuit board 14 as in the first embodiment.
  • the second path P2 is furthermore identical as is the first filter 24 of the first path P1.
  • the second end 20 of the radiating element 16 is connected to a ground connection GC leading to the ground plane.
  • This connection is typically provided as a conductor which can lead from the plane of the circuit board to the plane in which the radiating element is provided.
  • the ILA antenna is a half loop antenna, which can be seen as half a magnetic dipole antenna. This means that in the first frequency band the radiating element 16 is inductive in nature.
  • the tuning element T2 can be provided as a capacitance connected to ground instead of an inductor connected to ground.
  • the tuning element T2 is here as an example a capacitance of 30 pF.
  • the tuning element P2 when provided in this way will also provide a path to ground for operations in the second frequency band.
  • a further filter 35 is provided between the tuning element T2 and the radiating element 16.
  • the tuning element T2 and the first filter 24 share the same connection to the radiating element 16.
  • the further filter may be considered as a part of the first signal passing and blocking arrangement. Because of this the further filter 35 is provided in the first path P1 and here between the radiating element 16 and the first filter 24.
  • the tuning element T2 is then connected between ground and the junction between the first filter 24 and the further filter 35.
  • the further filter may here be a low pass filter in the form of an inductor having an exemplifying value of 20 nH.
  • Fig. 5 shows a perspective view of an antenna device according to a third embodiment of the present invention being provided above a circuit board in a similar way to the second embodiment.
  • the radiating element 16 includes a second feeding connection FC2.
  • This second feeding connection FC2 is provided between the first and the second ends 18 and 20.
  • This connection is typically provided as a conductor which can lead from the plane of the circuit board to the plane in which the radiating element is provided.
  • the second connection path P2 is connected to the first feeding connection FC1.
  • the first connection path P1 is connected to the second feeding connection FC2.
  • the further filter provided in the second embodiment is here also omitted since it is no longer needed.
  • the tuning element T2 tunes the radiating element 16 for fundamental resonance in the first frequency band.
  • this resonance is based on the length of the part of the single solid unbranched radiating element between the second feeding connection FC2 and the second end 20. This means that it is this length that is selected and used to provide resonance in the first frequency band.
  • the rest of the radiating element, i.e. the part between the first and second feeding connections FC1 and FC2 has more limited influence on the resonance in the first frequency band.
  • the second feeding connection FC2 acts as a grounding connection and thus the radiating element acts as an IFA (Inverted F Antenna) in this band. Also here the whole of the length of the radiating element is used for obtaining harmonic or fundamental resonance depending on which band is the second frequency band.
  • IFA Inverted F Antenna
  • Fig. 6 shows a perspective view of an antenna device according to a fourth embodiment of the present invention being provided above a circuit board in a similar way as the previous described embodiments.
  • this fourth embodiment there is a second feeding connection FC2 as in the fourth embodiment of the invention and there is a first connection path P1 of the same type as in the first embodiment connected to the first feeding connection FC1.
  • the second end 20 of the radiating element 16 is also floating just as in the first embodiment.
  • the second connection path P2 is furthermore provided in the same way as in the previously described embodiments
  • the second connection path P2 connects the second frequency band signal handling unit 32 with the second feeding connection FC2.
  • the whole length of the radiating element 16 is used for obtaining resonance in the first frequency band and the length of the part of the radiating element between the first and the second feeding connections FC1 and FC2 is used for obtaining resonance in the second frequency band.
  • the length of the whole radiating element 16 is selected for obtaining resonance in the first frequency band and the length of the part of the element between the first and the second feeding connections FC1 and FC2 is selected to provide resonance in the second frequency band.
  • the radiating element operates at the fundamental resonance in both the first and the second frequency bands.
  • Fig. 7 shows a perspective view of an antenna device according to a fifth embodiment of the present invention being provided above a circuit board in a similar way to the previously described embodiments.
  • the antenna device in this sixth embodiment is provided for operation in a third frequency band in addition to the first and second frequency bands.
  • This third frequency band may furthermore be provided between the first and the second frequency bands.
  • the antenna device according to this fifth embodiment is in many ways similar to the antenna device according to the fourth embodiment. However, there are some differences.
  • the second end 20 of the radiating element 16 is connected to a grounding connection GC just as in the second and third embodiments of the invention.
  • the first connection path is provided in essentially the same way as in the third embodiment. However, it is of course connected to the first feeding connection FC1.
  • the second connection path is also different.
  • the second connection path here includes a first branch connecting the radiating element 16 with the second frequency band signal handling unit 32 and a second branch connecting the radiating element 16 with a third frequency band signal handling unit 38.
  • the third frequency band is in this embodiment a GPS frequency band and therefore the third frequency band signal handling unit 38 is a GPS signal handling unit.
  • this second path includes a signal combining unit 36, here in the form of a diplexer, that allows the radiating element 16 to simultaneously handle signals in the second and the third frequency bands via the second feeding connection FC2.
  • This diplexer 36 is connected between the matching network 30 and the two signal handing units 32 and 38.
  • the matching network 30 is at one end connected to the matching network 30 and at another end separately connected to the second frequency band signal handling unit 32 and the third frequency band signal handling unit 38. Operation in the first and second frequency bands is essentially performed in the same way as in the fourth embodiment. However, here the length of the part of the single solid unbranched radiating element 16 between the second feeding connection FC2 and the second end 20 is also selected to provide operation in the third frequency band. This length is thus selected for providing resonance after matching using the matching network.
  • the resonance may here be fundamental or harmonic resonance.
  • the matching network may in some instances be omitted from the second connection path.
  • the different bands used may furthermore be varied.
  • the second frequency band may for instance be WCDMA RX (diversity) or GPS instead of Bluetooth. Where there are three frequency bands the second and third frequency band may be a combination of any of the above mentioned bands.
  • the first band may be a different band, such as for instance a DVBH television band.
  • the signal handling units were here described as separate units. It should be realized that two or more of them may be combined into the same physical entity, such as in the same component. These signal handling units were here also described as excluded from the antenna device. It should be realized that they may as an alternative also be included in the antenna device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Waveguide Aerials (AREA)
EP09155865A 2009-03-23 2009-03-23 Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenvorrichtung Withdrawn EP2234207A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09155865A EP2234207A1 (de) 2009-03-23 2009-03-23 Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenvorrichtung
PCT/SE2010/050295 WO2010110722A1 (en) 2009-03-23 2010-03-17 Antenna device and portable radio communication device comprising such an antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09155865A EP2234207A1 (de) 2009-03-23 2009-03-23 Antennenvorrichtung und tragbare Funkkommunikationsvorrichtung mit einer solchen Antennenvorrichtung

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EP2234207A1 true EP2234207A1 (de) 2010-09-29

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Cited By (6)

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WO2011158057A1 (en) * 2010-06-18 2011-12-22 Sony Ericsson Mobile Communications Ab Two port antennas with separate antenna branches including respective filters
CN104064879A (zh) * 2013-03-18 2014-09-24 苹果公司 具有两个天线和三个端口的天线系统
US9293828B2 (en) 2013-03-27 2016-03-22 Apple Inc. Antenna system with tuning from coupled antenna
US9444130B2 (en) 2013-04-10 2016-09-13 Apple Inc. Antenna system with return path tuning and loop element
CN109462031A (zh) * 2018-10-10 2019-03-12 清华大学 基于可变电感和可变电容的双级可调谐天线
US10355339B2 (en) 2013-03-18 2019-07-16 Apple Inc. Tunable antenna with slot-based parasitic element

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US20060097918A1 (en) 2002-11-18 2006-05-11 Tadashi Oshiyama Antenna for a plurality of bands
EP1496565A1 (de) * 2003-01-10 2005-01-12 Matsushita Electric Industrial Co., Ltd. Antenne und elektronische einrichtung damit
US20080055164A1 (en) * 2006-09-05 2008-03-06 Zhijun Zhang Tunable antennas for handheld devices

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WO2011158057A1 (en) * 2010-06-18 2011-12-22 Sony Ericsson Mobile Communications Ab Two port antennas with separate antenna branches including respective filters
US8942761B2 (en) 2010-06-18 2015-01-27 Sony Corporation Two port antennas with separate antenna branches including respective filters
CN104064879A (zh) * 2013-03-18 2014-09-24 苹果公司 具有两个天线和三个端口的天线系统
WO2014149172A1 (en) * 2013-03-18 2014-09-25 Apple Inc. Antenna system having two antennas and three ports
US9559433B2 (en) 2013-03-18 2017-01-31 Apple Inc. Antenna system having two antennas and three ports
CN104064879B (zh) * 2013-03-18 2017-02-08 苹果公司 具有两个天线和三个端口的天线系统
TWI583056B (zh) * 2013-03-18 2017-05-11 蘋果公司 具有兩個天線及三個埠的天線系統
US10355339B2 (en) 2013-03-18 2019-07-16 Apple Inc. Tunable antenna with slot-based parasitic element
US9293828B2 (en) 2013-03-27 2016-03-22 Apple Inc. Antenna system with tuning from coupled antenna
US9444130B2 (en) 2013-04-10 2016-09-13 Apple Inc. Antenna system with return path tuning and loop element
CN109462031A (zh) * 2018-10-10 2019-03-12 清华大学 基于可变电感和可变电容的双级可调谐天线

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