WO2017058178A1 - Ground excitation antennas - Google Patents

Ground excitation antennas Download PDF

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Publication number
WO2017058178A1
WO2017058178A1 PCT/US2015/052971 US2015052971W WO2017058178A1 WO 2017058178 A1 WO2017058178 A1 WO 2017058178A1 US 2015052971 W US2015052971 W US 2015052971W WO 2017058178 A1 WO2017058178 A1 WO 2017058178A1
Authority
WO
WIPO (PCT)
Prior art keywords
slot
excitation
arm
planar body
ground
Prior art date
Application number
PCT/US2015/052971
Other languages
French (fr)
Inventor
Sung Oh
Philip Wright
Original Assignee
Hewlett-Packard Development Company, L.P.
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 Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2015/052971 priority Critical patent/WO2017058178A1/en
Publication of WO2017058178A1 publication Critical patent/WO2017058178A1/en

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/30Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42Resonant 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242Supports; 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
    • H01Q1/243Supports; 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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00Antenna arrays or systems
    • H01Q21/28Combinations of substantially independent non-interacting antenna units or systems
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30Arrangements for providing operation on different wavebands
    • H01Q5/307Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364Creating multiple current paths
    • H01Q5/371Branching current paths

Abstract

Examples described herein include examples of a ground excitation antenna that includes a conductive planar body comprising an open ended slot, a slot excitation arm disposed in the open ended slot, a high frequency band excitation arm coupled to the slot excitation arm at a location on the slot excitation arm, and a signal feed connection coupled to the slot excitation arm and the high frequency band excitation arm at the location of the slot excitation arm.

Description

GROUND EXCITATION ANTENNAS

BACKGROUND

[0001] Many types of mobile computing devices use wireless

communication protocols to transmit and receive electronic signals

corresponding to voice and data. The transmission or reception of various wireless electronic signals involve the use of various corresponding types of antennas. The directivity, efficiency, and frequency ranges of such antennas are often constrained by the limitations placed on the size, volume, and dimensions of the device in which the antennas are implemented. The trend for smaller and thinner mobile computing devices, such as tablets, smart phones, laptops, and the like, introduce additional complexity in antenna design for use in such devices.

BRIEF DESCRIPTION OF THE DRAWINGS

[0002] FIG. 1 illustrates a schematic diagram of an example ground excitation antenna.

[0003] FIG.2A illustrates detailed views of an example ground excitation antenna.

[0004] FIG.2B illustrates a detailed view with dimensions of an example ground excitation antenna.

[0005] FIG. 3 depicts an example computing device chassis that includes two example ground excitation antennas.

[0006] FIG.4 depicts a schematic diagram of an example mobile computing device equipped with a ground excitation antenna structure.

[0007] FIG. 5 is a flowchart of an example method for forming a ground excitation antenna structure.

DETAILED DESCRIPTION

[0008] The present disclosure includes descriptions of various example ground excitation antennas that can be implemented in various form factors of mobile computing devices. Ground excitation antennas implemented in accordance with the present disclosure can use a ground plane of the mobile computing device as a component of the antenna structure. Such antenna structures can achieve low or no volume antenna structures and can thus enable the implementation of compact and slim mobile computing device form factors. In some implementations, the ground excitation antenna structures can be integrated into existing printed circuit board (PCB) or chassis structures of a mobile computing device. In addition, elements of the ground excitation antenna maintained at a ground voltage can be utilized for placement of other components of the mobile computing device, such as connectors, PCB routings, microphones, accelerometers, and the like. As such, implementations of the present disclosure can provide for efficient space utilization within a mobile computing device.

[0009] As described herein, various example implementations of the present disclosure include ground excitation antenna structures that use a ground plane of a conductive planar body in a mobile computing device to excite multiple antenna resonance modes. Such structures allow for compact and slim mobile computing devices by avoiding increases to the volume or size of the antenna to guarantee radiation performance in the antenna. In addition, ground excitation antenna structures described herein can include two-dimensional structures that can be easily integrated into existing PCB or chassis of mobile computing devices. The simplicity of integrating the ground excitation antenna structures into existing structures can reduce the engineering costs and increase product reliability.

[0010] FIG. 1 illustrates a schematic representation of an example ground excitation antenna structure 100. As shown, the ground excitation antenna structure 100 can include an open ended slot 133 formed in a conductive planar body 110 to create a perimeter arm 135. The conductive planar body 110 can include various elements of a mobile computing device. For example, the conductive planar body can include a metal chassis or housing of the mobile computing device, a PCB, a flexible printed circuit board (FPCB), a display device (e.g., a touchscreen, a flat-panel display, etc.), a user interface device (e.g., a touchpad), or any other component of the mobile computing device that has a planar conductive body that can be maintained at a particular potential (e.g., voltage). As such, the open ended slot 133 can include a ground clearance area 111 isolated from the ground potential at which the conductive planar body 110 is maintained. For example, the open ended slot 133 can be formed using a ground clearance area 111 that includes free space, air gaps, insulating material (e.g., glass-reinforced epoxy sheets, plastic housing, etc.), removal of a metal layer of a PCB, and the like.

[0011] The ground excitation antenna structure 100 can also include a slot excitation arm 131 and a high frequency band excitation arm 130. As shown, a first end of the linear slot excitation arm 131 can be disposed in the slot 133. The high frequency band excitation arm 130 can be coupled to a second end of the linear slot excitation arm 131. In the example implementation depicted in FIG. 1 , the high frequency band excitation arm 130 is disposed in the same plane as the slot excitation arm 131 and oriented within the plane at an orthogonal angle. In other example implementations, however, the slot excitation arm 131 and the high frequency band excitation arm 130 may be disposed in parallel or non-coplanar planes and oriented at various angles to one another.

[0012] As illustrated, the high frequency band excitation arm 130 can include multiple antenna elements. In the specific example shown, the high frequency band excitation arm 130 includes a primary antenna element coupled to the slot excitation arm 131 at a first end and an orthogonal antenna element coupled to a second end of the primary antenna element. In the configuration shown, the primary antenna elements and the orthogonal antenna elements of the high frequency band excitation arm 130 are oriented relative to one another to make an L-shape. In other implementations, the primary and orthogonal antenna elements of the high frequency band excitation arm 130 can be at angles other than 90° relative to one another.

[0013] In various implementations, a signal source connection 120 can be coupled to the slot excitation arm 131 and the high frequency band excitation arm 130. As shown, the signal source connection 120 can be coupled to the slot excitation arm 131 and the high frequency band excitation arm 130 at the point at which the two elements are coupled. For example, the signal source connection 120 can be coupled to the second end of the slot excitation arm 131 opposite of the first end of the slot excitation arm 131 disposed in the slot 133. Accordingly, the signal source connection 120 can also be coupled to the high frequency band excitation arm 130 at a first end of the primary element opposite of the second end coupled to the orthogonal element. In various implementations, the signal source connection 120 can also be coupled to or isolated from the conductive planar body 110.

[0014] In other such implementations, the potential of the conductive planar body 110, the perimeter arm 135, and/or the signal source connection 120 can be equal. However, in implementations in which the signal source connection 120 is isolated from the conductive planar body 110, the potential of the signal source connection 120 can be driven independently.

Consequently, when the signal source connection 120 is driven with a signal in accordance with a particular wireless data communication protocol, the slot excitation arm 130 can excite wide bandwidth resonances at frequencies of a low frequency band of the protocol as well as resonances at frequencies of a high frequency band of the protocol. When the signal source connection 120 is driven with the signal in accordance with the particular wireless data communication protocol, the high frequency band excitation arm, disposed in the ground clearance region 111 , can further expand the high frequency band bandwidth excited in the slot excitation arm 131 and slot 133.

[0015] The terms "low frequency band" and "high frequency band" are used herein to refer to the relative placement of various ranges of frequencies within a particular wireless data communication protocol. Accordingly, frequencies in the low frequency band will be correspondingly lower than frequencies in the high frequency band.

[0016] in implementations in which the perimeter arm 135 is at the same potential as the conductive planar body 110, various components of the mobile computing can be attached to the perimeter arm 135 without impacting the radiation performance of the ground excitation antenna structure 100. For example, PCB mounted components and/or connectors can be coupled to the perimeter arm 135. The availability of the region defined by the perimeter arm 135 for accepting various mobile computing device components increases the surface area available and can thus help reduce the overall size or increase the functionality of the mobile computing device without sacrificing antenna performance.

[0017] As shown in FIG. 1 , the extension 139 of the perimeter arm 135 can have a dimension 145 as measured from the edge of the slot 133 closest to the conductive planar body 110. The length of the perimeter arm 135 can have an overall length 143 with a portion of the perimeter arm 137 disposed adjacent to the slot 133. The portion of the perimeter arm 137 displaced from the conductive planar body 110 by the width 140 of the slot 133. The ground clearance area 111 proximate to the high frequency band excitation arm 130 can have a width 141. Each of the dimensions of the elements of the slot excitation antenna structure 100 can depend on the dimensions of the other elements and/or the frequency bands over which the electronic

communications are to be conducted. For example, the specific dimensions of the elements depicted in FIG. 1 can depend on the particular wireless data communication protocol.

[0018] In some example embodiments, the wireless data communication protocol can include one of the following standards a Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Enhanced Data rates for GSM Evolution (EDGE), Personal Communications Service (PCS), Code Divisional Multiple Access (CDMA), Evolution-Data Optimized (EV-DO), High-Speed Downlink Packet Access (HSDPA), High- Speed Uplink Packet Access (HSU PA), Advanced Wireless Services (AWS), Long Term Evolution (LTE), World Wide Interoperability for Microwave Access (WiMax), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, or IEEE 802.20. Each of the aforementioned wireless data

communication protocols can include specifications for particular frequency bands. Accordingly, the dimensions of the element of the slot excitation antenna structure 100 can be chosen to achieve resonances in the particular frequency bands of the selected wireless data communication protocol.

[0019] FIG. 2A depicts a perspective view and a top view of an example slot excitation antenna structure 100 formed on conductive planar body 110, such as a metallic chassis or PCB, of a mobile computing device, (e.g., a smart phone, tablet computer, touchscreen, etc.). As shown, the perimeter arm 135 can extend the distance 145 from the main component of the conductive planar body 110. The slot 133 can be disposed between the perimeter arm 135 and the conductive planar body 110. As such, the ground excitation antenna structure 100 can be implemented in various perimeter components of a mobile computing device.

[0020] In the example shown, the ground excitation antenna structure 100 can be implemented in the bezel, chassis, or in perimeter regions of a PCB. In implementations in which the ground excitation antenna structure 100 is formed in the metal surface of a PCB, each of the elements of the antenna structure can be formed by etching, milling, or otherwise selectively removing regions of metal to form the slot 133, the perimeter arm 135, as well as the slot excitation arm 131 and the high frequency band excitation arm 130.

[0021] In implementations in which the slot 133 and the perimeter arm 135 are formed in the chassis or bezel of a mobile computing device, the various antennas of the ground excitation antenna structure 100 can be formed on corresponding insulating materials. For example, the ground clearance area 111 can include a structure made of a plastic insulating material on which the slot excitation arm 131 and the high frequency band excitation arm 130 can be disposed. In some implementations, the insulating material can be included in or be a part of a nonconductive housing of a mobile computing device.

[0022] FIG. 2B depicts a detailed view of the dimensions an example ground excitation antenna structure 100, according to various

implementations of the present disclosure. As previously described, the slot 133 can have a width 140. The overall extension 145 and length 143 of the perimeter arm 135 can be set based on the width 140 and/or the frequency bands defined in the corresponding wireless data communication protocol. Similarly, the length 144 of the orthogonal antenna element of the high frequency band excitation arm 130, the width 141 of the ground clearance region, and the gap 148 can be determined based on the locations and widths of the frequency bands defined in the wireless data communication protocol. [0023] FIG. 3 depicts an example implementation of a multiple-in multiple- out (MIMO) ground excitation antenna structure 300. As shown, the MIMO ground excitation antenna structure 300 can include multiple ground excitation antenna structures 100 disposed in close proximity to one another. In the particular example shown, the perimeter arms 135 of the ground excitation antenna structures 100 can be formed from the chassis or PCB of the mobile computing device and the ground clearance area 111 can include the material of the housing of the mobile computing device. One example implementation of the MIMO ground excitation antenna structure 300 can be dimensioned to support LTE wireless communication. In such implementations, one of the ground excitation and antenna structures 100 can be designated as the LTE main antenna 303 and the other can be designated as the LTE diversity antenna 301. The configuration shown in FIG. 3 allows for the two antennas 301 and 303 to be closely to one another and also achieve high isolation and low envelope correlation coefficients.

[0024] FIG. 4 depicts an example mobile computing device 400 in which various examples of the present disclosure can be implemented. As shown, the mobile computing device 400 can include a processor 421. The processor 421 can be coupled to a ground excitation antenna structure 100 and/or a memory 423. The memory 423 can include any combination of transitory and non-transitory computer readable media. As such, the memory 423 can include volatile and nonvolatile memory technologies for storing computer executable code for implementing or driving various examples of the present disclosure. In various examples, the computer executable code stored in the memory 423 can include instructions for performing various operations described herein

[0025] For example, the processor 421 can execute signal driving code 430 that includes instructions for generating signals for driving the signal source connection 120 of the ground excitation antenna structure 100 as described herein. In various other examples, the processor 421 can execute the multi-band wireless communication protocol code 440 and modulates the signals for driving the signal source connection 120 to generate wireless communication signals using the ground excitation antenna structure 100. In related implementations, the processor 421 can execute executable code stored in the memory 423 to detect wireless communication signals received by or excited in the ground excitation antenna structure 100 to implement two- way data communications.

[0026] Various examples of the present disclosure can be implemented as any combination of executable code and hardware. For example,

implementations can include computer executable code executed by a processor 421 or mobile computing device 400 to cause resonances in the ground excitation antenna structure 100 to communicate according to a wireless communication protocol. As such, the functionality of processor 421 or mobile computing device 400 described herein can be implemented as executable code that includes instructions that when executed by the processor cause the processor to perform operations, or generate signals that cause other devices (e.g., components of the mobile computing device 400) to perform operations, in accordance with various implementations and example described herein.

[0027] For example, the functionality for driving signal source connection 120 can be implemented as executable signal driving code 430 stored in the memory 423 and executed by processor 421. Similarly, the functionality for modulating the drive signals to communicate wirelessly using a corresponding multi-band wireless communication protocol can be implemented as multi- band wireless communication protocol code 440 stored in memory 423 and executed in processor 421

[0028] The processor 421 may be a microprocessor, a micro-controller, an application specific integrated circuit (ASIC), or the like. According to an example implementation, the processor 421 is a hardware component, such as a circuit.

[0029] The memory 423 can include any type of transitory or non- transitory computer readable medium. For example the memory 423 can include volatile or non-volatile memory, such as dynamic random access memory (DRAM), electrically erasable programmable read-only memory (EEPROM), magneto-resistive random access memory (MRAM), memristor. flash memory, floppy disk, memristor array, a compact disc read only memory (CD-ROM), a digital video disc read only memory (DVD-ROM), or other optical or magnetic media, and the like, on which executable code may be stored.

[0030] FIG. 5 depicts a flowchart of the method 500 of forming a ground excitation antenna structure according to various implementations of the present disclosure. Method 500 can begin by forming a conductive planar body at box 510. Forming a conductive planar body can include providing a conductive housing, chassis, or PCB on or about which the mobile computing device will be built.

[0031] At box 520, the perimeter arm can be formed by creating or forming an open-ended slot in the conductive planar body. In some implementations, forming the slot can include cutting, milling, etching, or otherwise removing the conductive material from a slot shaped region in the conductive planar body. For example, in implementations in which the conductive planar body is the chassis of mobile computing device, the slot can be formed when the chassis is being cut and/or machined. In implementations in which the conductive planar body is a metal layer on a PCB, the slot can be formed by etching a region of the metal layer to form the ground clearance area.

[0032] At box 530, the method can include disposing a first end of a linear slot excitation arm in the open-ended slot in a plane parallel to the conductive planar body. The length of the slot excitation arm can be shorter than, equal to, or greater than a length dimension of the slot. Disposing a first end of linear slot excitation arm can include creating a trace in the metal layer of a PCB by selectively etching, milling, or otherwise removing regions of the metal layer to leave a trace in the form of a slot excitation arm. In other implementations, disposing the slot excitation arm can include inserting a separately formed linear conductive element into the slot.

[0033] At box 540, a high frequency band excitation arm can be coupled to the slot excitation arm in the plane parallel to the conductive planar body at a location not in the open-ended slot. In some implementations, the high frequency band excitation arm can be formed and coupled to the slot excitation arm in the same process. Accordingly, the high frequency band excitation arm can be formed by selectively etching milling or otherwise removing regions of the metal layer in a PCB to leave a trace in the form of the high frequency band excitation arm.

[0034] These and other variations, modifications, additions, and improvements may fall within the scope of the appended claims(s). As used in the description herein and throughout the claims that follow, "a", "an", and "the" includes plural references unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the elements of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or elements are mutually exclusive.

Claims

Claims What is claimed is:
1. A ground excitation antenna comprising:
a conductive planar body comprising an open ended slot;
a slot excitation arm disposed in the open ended slot;
a high frequency band excitation arm coupled to the slot excitation arm at a location on the slot excitation arm; and
a signal feed connection coupled to the slot excitation arm and the high frequency band excitation arm at the location of the slot excitation arm.
2. The ground excitation antenna of claim 1 wherein the conductive planar body comprises a conductive layer on a printed circuit board and the open ended slot comprises a region on the printed circuit board from which the conductive layer has been removed.
3. The ground excitation antenna of claim 2 wherein the slot excitation arm comprises a first conductive linear trace formed on the printed circuit board, and the high frequency band excitation arm comprises a second conductive linear trace formed on the printed circuit board.
4. The ground excitation antenna of claim 1 wherein the location on the slot excitation arm is at a first end of the slot excitation arm disposed in the open ended slot.
5. The ground excitation antenna of claim 1 wherein the open ended slot and the slot excitation arm are oriented parallel to a first dimension of the conductive planar body, and the high frequency band excitation arm is oriented parallel to a second dimension of the conductive planar body.
6. The ground excitation antenna of claim 5 wherein the first dimension of the conductive planar body is perpendicular the second dimension of the conductive planar body.
7. The ground excitation antenna of claim 1 wherein the conductive planar body comprises a chassis of a mobile computing device.
8. The ground excitation antenna of claim 1 wherein the conductive planar body is coupled to a ground state voltage.
9. The ground excitation antenna of claim 1 wherein the slot excitation arm is dimensioned and disposed relative the open ended slot to provide a particular bandwidth in a first frequency and to provide resonance in a second frequency band.
10. The ground excitation antenna of claim 1 wherein the high frequency band excitation arm is isolated from the conductive planar body to expand a second frequency band associated with the slot excitation arm.
11. A mobile computing device comprising:
a processor;
a transceiver coupled to the processor;
a conductive planar body coupled to the transceiver and the processor and comprising an open ended slot to form an conductive arm coupled to the conductive planar body;
a slot excitation arm disposed in the open ended slot;
a high frequency band excitation arm coupled to the slot excitation arm at a location on the slot excitation arm; and
a signal feed connection coupled to the slot excitation arm and the high frequency band excitation arm at the location of the slot excitation arm.
12. The mobile computing device of claim 11 further comprising an electronic component device disposed on the conductive arm and coupled to the processor.
13. The mobile computing device of claim 11 , wherein the conductive planar body comprises a printed circuit board and the open ended slot comprises a region of the printed circuit board comprising no conductor.
14. A method for a ground excitation antenna comprising:
forming a conductive planar body;
forming a conductive arm by forming an open ended slot in the conductive planar body;
disposing a slot excitation arm in the open ended slot in a plane parallel to the conductive planar body;
coupling the high frequency band excitation arm to a slot excitation arm in the plane parallel to the conductive planar body and at a location on the slot excitation arm not in the open ended slot.
15. The method of claim 14 wherein forming the conductive planar body comprises providing a metal clad substrate, and forming the open ended slot comprises removing a corresponding region of metal from the metal clad substrate.
PCT/US2015/052971 2015-09-29 2015-09-29 Ground excitation antennas WO2017058178A1 (en)

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Application Number Priority Date Filing Date Title
PCT/US2015/052971 WO2017058178A1 (en) 2015-09-29 2015-09-29 Ground excitation antennas
TW105124311A TWI622226B (en) 2015-09-29 2016-08-01 Ground excitation antennas

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US20130082884A1 (en) * 2011-09-30 2013-04-04 Google Inc. Antennas for computers with conductive chassis
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US20140111388A1 (en) * 2012-04-09 2014-04-24 Carlo Di Nallo Antenna surrounded by metal housing
US20140118204A1 (en) * 2012-11-01 2014-05-01 Nvidia Corporation Antenna integrated with metal chassis

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Publication number Priority date Publication date Assignee Title
US8750947B2 (en) * 2012-02-24 2014-06-10 Htc Corporation Mobile device and wideband antenna structure therein
US20140253398A1 (en) * 2013-03-06 2014-09-11 Asustek Computer Inc. Tunable antenna
US9917357B2 (en) * 2013-06-06 2018-03-13 Sony Corporation Antenna system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120154223A1 (en) * 2010-12-21 2012-06-21 Sung-Hoon Oh Signal generation through using a grounding arm and excitation structure
US20130082884A1 (en) * 2011-09-30 2013-04-04 Google Inc. Antennas for computers with conductive chassis
KR20130084931A (en) * 2012-01-18 2013-07-26 삼성전자주식회사 Antenna apparatus for portable terminal
US20140111388A1 (en) * 2012-04-09 2014-04-24 Carlo Di Nallo Antenna surrounded by metal housing
US20140118204A1 (en) * 2012-11-01 2014-05-01 Nvidia Corporation Antenna integrated with metal chassis

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TW201712946A (en) 2017-04-01

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