EP2026407A1 - Planare mehrbandige PIFA-Antennenanordnung - Google Patents

Planare mehrbandige PIFA-Antennenanordnung Download PDF

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Publication number
EP2026407A1
EP2026407A1 EP07253190A EP07253190A EP2026407A1 EP 2026407 A1 EP2026407 A1 EP 2026407A1 EP 07253190 A EP07253190 A EP 07253190A EP 07253190 A EP07253190 A EP 07253190A EP 2026407 A1 EP2026407 A1 EP 2026407A1
Authority
EP
European Patent Office
Prior art keywords
antenna
radiating element
planar inverted
inverted
band planar
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Withdrawn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
EP07253190A
Other languages
English (en)
French (fr)
Inventor
Chin-Cheng Chien
Chien-Hsien Ho
Chien-Jung Lin
Yu-Sheng Chang
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.)
Mobinnova Hong Kong Ltd
Original Assignee
Mobinnova Hong Kong Ltd
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 Mobinnova Hong Kong Ltd filed Critical Mobinnova Hong Kong Ltd
Priority to EP07253190A priority Critical patent/EP2026407A1/de
Publication of EP2026407A1 publication Critical patent/EP2026407A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • 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

Definitions

  • the present invention relates to a multi-band plane inverted-F antenna (PIFA), especially to a multi-band PIFA with an inverted-L short-line to induce a loop surface current, thus enhancing the bandwidth of the multi-band PIFA at multiple frequencies of interest.
  • PIFA multi-band plane inverted-F antenna
  • Modem electronic products for consumer have the trends of compact size and light weight, as manufacture technology and design skill progress. It is also desirable to integrate more versatile functions to the electronic products.
  • wireless communication devices as example, the networking accessing function through wireless application protocol (WAP) and e-mail function are augmented to the original voice function.
  • WAP wireless application protocol
  • smart phones with data processing ability and wireless LAN function are also attractive to user these years.
  • the smart phones can provide advanced functions such as mobile TV and business transaction as the wireless bandwidth increases and the processing ability of mobile phone is enhanced.
  • the antenna for mobile phone is also demanded to scale down for compact requirement.
  • a microwave antenna such as dipole antenna and microstrip patch
  • the physical size of a microwave antenna is around the half wavelength of the resonant modes of the antenna size.
  • planar inverted-F antenna PIFA
  • Planar inverted-F antenna can also be realized as a hidden antenna for mobile phone due to the low profile property.
  • Fig. 1 shows the schematic diagram of a prior art planar inverted-F antenna.
  • the planar inverted-F antenna 10a mainly comprises a radiating unit 12a, a ground plane 20a, a dielectric material (not shown), a shorting element 16a and a feeding element 14a.
  • the dielectric material is sandwiched between the radiating unit 12a and the ground plane 20a to provide isolation therebetween.
  • the radiating unit 12a is coupled to the ground plane 20a through the shorting element 16a.
  • the feeding element 14a is arranged on the ground plane 20a and is coupled to the radiating unit 12a for signal transmission.
  • the radiating unit 12a and the ground plane 20a can be implemented with metallic material.
  • the radiating unit 12a is designed with specific pattern for achieving desired operating wavelength and radiation performance.
  • the most attractive feature of planar inverted-F antenna is the ability to work at quarter wavelength for advantageously reducing the size of antenna.
  • the prior art planar inverted-F antenna has the drawbacks of insufficient bandwidth and inability to work at multiple frequencies (more than dual-band frequencies).
  • the smart phone is expected to work at tri-bands or even qua-band mobile communication frequencies, and have accessing ability to WLAN. Therefore, it is important issue to provide a multi-band planar inverted-F antenna for mobile phones such as smart phones.
  • PIFA multi-band plane inverted-F antenna
  • the present invention provides a multi-band plane inverted-F antenna (PIFA), which includes a radiating unit, a ground unit and a feeding unit.
  • the radiating unit includes a common radiating element, a high-frequency (HF) radiating element and a low-frequency (LF) radiating element.
  • a quasi U-shaped slot is defined between the HF radiating element and the LF radiating element.
  • the ground unit is electrically connected to one side of the common radiating element.
  • the feeding unit includes a strip electrically connected to one side of the HF radiating element.
  • the ground unit includes a ground point and an inverted-L short-line connected to the ground point at one end thereof.
  • the inverted-L short-line is also electrically connected to the common radiating element at another end thereof.
  • a loop surface current induced by the inverted-L short-line can advantageously enhance bandwidth of the multi-band planar inverted-F antenna at frequencies of interest.
  • the multi-band planar inverted-F antenna according to a preferred embodiment of the present invention comprises a ground unit 1, a radiating unit 2 and a feeding unit 3.
  • the ground unit 1 is of plate shape and comprises a ground point 11.
  • a ground hole 111 is defined on the ground point 11 and is fixed to an electronic device (not shown) by a retaining element (not shown). Alternatively, the ground hole 111 is electrically connected to a ground terminal of an electronic device (not shown).
  • a flange 112 is outwardly extended from one side of the ground point 11; and an inverted-L short-line 12 is extended from another end of the ground point 11.
  • the inverted-L short-line 12 is preferably 1/8 resonant wavelength of the multi-band PIFA of the present invention and is electrically connected to the radiating unit 2.
  • the radiating unit 2 is of plate shape and comprises a common radiating element 21, a high-frequency (HF) radiating element 22 and a low-frequency (LF) radiating element 23, which are electrically connected together.
  • Two dents 211 and 211' are defined on one side of the common radiating element 21.
  • the ground unit 1 is electrically connected to the common radiating element 21 at a location near the dent 211 and with a bending angle, wherein the bending angle is substantially close to or equal to 90 degrees.
  • a round through hole 221 is defined at a location where the common radiating element 21 is electrically connected with the HF radiating element 22.
  • An L-shaped slot 22 is communicated with the round through hole 221 and is defined by a bottom side 223 of the HF radiating element 22 and a top side 212 of the common radiating element 21.
  • the HF radiating element 22 comprises an arc-shaped lateral side 224, a parallel top side 225 and an L-shaped lateral side 226.
  • the arc-shaped lateral side 224, the top side 225 and the L-shaped lateral side 226, as well as the bottom side 223 define the surface area of the HF radiating element 22.
  • a tab 227 is extended from the L-shaped lateral side 226 and the bottom side 223 of the HF radiating element 22.
  • the LF radiating element 23 comprises an arc-shaped inner side 231 and an L-shaped inner side 232.
  • a quasi U-shaped slot 233 is defined by the arc-shaped inner side 231, the L-shaped inner side 232, the arc-shaped lateral side 224, the top side 225 and the L-shaped lateral side 226.
  • a stair-shaped section 234 is formed on the outer face of the LF radiating element 23.
  • the stair-shaped section 234, the arc-shaped inner side 231 and the L-shaped inner side 232 define a first surface portion 23a, a second surface portion 23b, a third surface portion 23c, a fourth surface portion 23d and a fifth surface portion 23e.
  • the second surface portion 23b and the fourth surface portion 23d have relatively narrower width than those of the first surface portion 23a, the third surface portion 23c and the fifth surface portion 23e.
  • a bent panel 235 with continuous bending is extended from one side of the LF radiating element 23.
  • the feeding unit 3 comprises an L-shaped strip 31, which is connected to the tab 227 on one side of the HF radiating element 22.
  • the feeding unit 3 is electrically connected to the HF radiating element 22 with a bending angle and the bending angle is substantially close to or equal to 90 degrees.
  • a through hole 32 is defined at one end of the L-shaped strip 31 and soldered with a coaxial cable (not shown), which feeds signal into the antenna.
  • the sizes of the HF radiating element 22 and the LF radiating element 23 can be adjusted to match quarter-wavelength of a resonant mode of the antenna.
  • the second surface portion 23b and the fourth surface portion 23d are designed to have relatively narrower width than those of the first surface portion 23a, the third surface portion 23c and the fifth surface portion 23e.
  • the antenna portion with wider cross section has larger current flowing there through, this will result in a good Q factor.
  • the bandwidth of the antenna is influenced. Therefore, some antenna portions are provided with narrower width to enhance bandwidth of the antenna.
  • the length of the inverted-L short-line 12 is preferably 1/8 resonant wavelength of the multi-band PIFA of the present invention.
  • the inverted-L short-line 12 is connected between the feed point 3 and the ground point 11.
  • a loop surface current 4 is induced around the peripheral of the round through hole 221 and the L-shaped slot 22. Therefore, the bandwidth of the multi-band PIFA of the present invention can be broadened.
  • the multi-band PIFA of the present invention has broader bandwidth at multiple operation frequencies.
  • the multi-band PIFA of the present invention can be advantageously employed for mobile communication devices (such as smart phones) requiring broader bandwidth at multiple frequencies.
  • Fig. 5 shows the voltage standing wave ratio (VSWR) for the multi-band PIFA of the present invention.
  • the VSWR measurements of the multi-band PIFA of the present invention are 2.91, 2.09, 3.17, 3.46, 2.22 and 3.19 for operational frequencies of 824MHz, 894MHz, 960MHz, 1710MHz, 1990MH and 2170MHz, respectively.
  • all the VSWR measurements of the multi-band PIFA of the present invention at frequencies of interest are below 3.5. This proves the multi-band PIFA of the present invention has excellent VSWR for multiple frequencies.
  • Fig. 6 shows the return loss measurement for the multi-band PIFA of the present invention.
  • the return loss are -6.30dB, -9.03dB, -5.67dB, -5.16dB, -8.41dB and -5.62dB for operational frequencies of 824MHz, 894MHz, 960MHz, 1710MHz, 1990MH and 2170MHz, respectively.
  • all the return loss of the multi-band PIFA of the present invention at frequencies of interest are below -5.0. This proves the multi-band PIFA of the present invention has excellent return loss for multiple frequencies.
  • Figs. 7 to 10 show the antenna gains of the present invention on different polarized principle planes and at different frequencies.
  • the peak gain on vertically polarized principle plane is -0.55dBi when the antenna of the present invention is operated at 894MHz.
  • the peak gain on horizontally polarized principle plane is -1.36dBi when the antenna of the present invention is operated at 894MHz.
  • the peak gain on vertically polarized principle plane is 0.24dBi when the antenna of the present invention is operated at 1880MHz.
  • the peak gain on horizontally polarized principle plane is -0.39dBi when the antenna of the present invention is operated at 1880MHz.
  • Fig. 11 shows the perspective view of the multi-band planar inverted-F antenna according to another preferred embodiment of the present invention.
  • a plurality of round grooves 5 are defined on the surface of the radiating unit 2.
  • the round grooves 5 enhance stress on the radiating unit 2 to prevent a deformation of the radiating unit 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
EP07253190A 2007-08-14 2007-08-14 Planare mehrbandige PIFA-Antennenanordnung Withdrawn EP2026407A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07253190A EP2026407A1 (de) 2007-08-14 2007-08-14 Planare mehrbandige PIFA-Antennenanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07253190A EP2026407A1 (de) 2007-08-14 2007-08-14 Planare mehrbandige PIFA-Antennenanordnung

Publications (1)

Publication Number Publication Date
EP2026407A1 true EP2026407A1 (de) 2009-02-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07253190A Withdrawn EP2026407A1 (de) 2007-08-14 2007-08-14 Planare mehrbandige PIFA-Antennenanordnung

Country Status (1)

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EP (1) EP2026407A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2410607A1 (de) * 2010-07-23 2012-01-25 Research In Motion Limited Mobile drahtlose Vorrichtung mit Mehrbandrahmenantenne mit Armen, die eine schlitzförmige Öffnung bilden, und zugehörige Verfahren
WO2015085554A1 (zh) * 2013-12-12 2015-06-18 华为终端有限公司 一种天线和终端

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003103088A1 (fr) * 2002-05-31 2003-12-11 Sagem Sa Antenne multi-frequence integree pour telephone mobile
US20040066334A1 (en) * 2002-10-08 2004-04-08 Wistron Neweb Corporation Multifrequency inverted-F antenna
WO2004038857A1 (en) * 2002-10-24 2004-05-06 Nokia Corporation Radio device and antenna structure
WO2004059785A2 (en) * 2002-12-30 2004-07-15 Nokia Corporation An internal antenna element
US20060139218A1 (en) * 2004-12-24 2006-06-29 Samsung Electronics Co., Ltd. Method for tuning antenna module in portable wireless terminal and built-in antenna module using the same
US20070115189A1 (en) * 2002-12-06 2007-05-24 Research In Motion Limited Multiple-band antenna with shared slot structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003103088A1 (fr) * 2002-05-31 2003-12-11 Sagem Sa Antenne multi-frequence integree pour telephone mobile
US20040066334A1 (en) * 2002-10-08 2004-04-08 Wistron Neweb Corporation Multifrequency inverted-F antenna
WO2004038857A1 (en) * 2002-10-24 2004-05-06 Nokia Corporation Radio device and antenna structure
US20070115189A1 (en) * 2002-12-06 2007-05-24 Research In Motion Limited Multiple-band antenna with shared slot structure
WO2004059785A2 (en) * 2002-12-30 2004-07-15 Nokia Corporation An internal antenna element
US20060139218A1 (en) * 2004-12-24 2006-06-29 Samsung Electronics Co., Ltd. Method for tuning antenna module in portable wireless terminal and built-in antenna module using the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2410607A1 (de) * 2010-07-23 2012-01-25 Research In Motion Limited Mobile drahtlose Vorrichtung mit Mehrbandrahmenantenne mit Armen, die eine schlitzförmige Öffnung bilden, und zugehörige Verfahren
US8497806B2 (en) 2010-07-23 2013-07-30 Research In Motion Limited Mobile wireless device with multi-band loop antenna with arms defining a slotted opening and related methods
US8648751B2 (en) 2010-07-23 2014-02-11 Blackberry Limited Mobile wireless device with multi-band loop antenna with arms defining a slotted opening and related methods
WO2015085554A1 (zh) * 2013-12-12 2015-06-18 华为终端有限公司 一种天线和终端

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