EP1560287A1 - Mehrfrequenzantenne - Google Patents

Mehrfrequenzantenne Download PDF

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Publication number
EP1560287A1
EP1560287A1 EP04002213A EP04002213A EP1560287A1 EP 1560287 A1 EP1560287 A1 EP 1560287A1 EP 04002213 A EP04002213 A EP 04002213A EP 04002213 A EP04002213 A EP 04002213A EP 1560287 A1 EP1560287 A1 EP 1560287A1
Authority
EP
European Patent Office
Prior art keywords
antenna
operational frequency
bandwidth
frequency
current path
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.)
Granted
Application number
EP04002213A
Other languages
English (en)
French (fr)
Other versions
EP1560287B1 (de
Inventor
Jui-Hung Hsu
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.)
HTC Corp
Original Assignee
High Tech Computer Corp
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 High Tech Computer Corp filed Critical High Tech Computer Corp
Priority to EP04002213.9A priority Critical patent/EP1560287B1/de
Publication of EP1560287A1 publication Critical patent/EP1560287A1/de
Application granted granted Critical
Publication of EP1560287B1 publication Critical patent/EP1560287B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • 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

Definitions

  • the invention relates in general to a type of antenna, and more particularly to a type antenna that has multiple operational frequencies.
  • PDA personal digital assistant
  • the antenna In a wireless system, the antenna is the window for signal transmission and it directly influences the transmission quality of the wireless signals. Its significance is self-evident.
  • the microstrip antenna is a mature technology that (1) has simple structure, (2) has small size, and (3) can easily be integrated into circuit boards. Those properties allow microstrip antennas to play an important role in personal communicational systems.
  • other objective conditions such as low dielectric constant, large current distribution, and low loss in the antenna's material need to be met.
  • the overall quality of the antenna is closely related to these conditions.
  • the invention achieves the above-identified object by providing a multi-frequency antenna.
  • the multi-frequency antenna includes an antenna body, a patch antenna, and a ground plane.
  • the antenna body has first and second radiation arms, as well as a feed-in terminal and a ground terminal both disposed in one side of the antenna body for the purpose of signal feeding and grounding.
  • the first and second radiation arms are arranged in a symmetrically inward spiral structure. Two current paths with different lengths are created along the two radiation arms from the feed-in terminal, thereby enabling the antenna to operate at two frequencies.
  • a patch antenna can be disposed beside the antenna body to allow the antenna to have more operational frequencies.
  • the length of the patch antenna can be designed according to the bandwidth used by Bluetooth signals in order to meet the requirement of Bluetooth communication.
  • the ground plane is located beneath the antenna body and the patch antenna for the purpose of grounding of the antenna's signals.
  • a section of the ground plane which is above the endfire direction, can be hollowed in order to increase antenna's bandwidth.
  • the hollowed section can also be used to dispose other components in order to increase the component density.
  • FIG. 1A is a diagram illustrating a multi-frequency antenna according to a preferred embodiment of the invention.
  • FIG. 1B illustrates a symmetrically inward spiral structure
  • FIG. 2 illustrates a patch antenna
  • FIG. 3A depicts the arrangement of the antenna body, the patch antenna, and the ground plane of the multi-frequency antenna.
  • FIG. 3B shows that the ground plane is partially hollowed.
  • FIG. 4 charts the measurement result of the return loss of the antenna body 100.
  • FIG. 5 charts the measurement result of the return loss of the patch antenna 200.
  • the antenna body 100 has a first radiation arm ARM1 and a second radiation arm ARM2.
  • the antenna body 100 is also equipped with a feed-in terminal FD and a ground terminal GND for feed-in of signals and grounding of signals respectively.
  • two major current paths are formed; current path L1 starts from feed-in terminal FD and goes through the radiation arm ARM1; current path L2 starts from feed-in terminal FD and goes through the radiation arm ARM2.
  • the current path L1 is shorter than the current path L2.
  • the antenna has a higher operational frequency f H if resonance occurs across the current path L1.
  • the antenna has a lower operational frequency f L .
  • the antenna body 100 is operable at two frequencies.
  • the operational frequency f L can be set within the GSM bandwidth (824-960 MHz)
  • the operational frequency f H can be set within the PCS bandwidth (1710 ⁇ 1900 MHz). Therefore, the requirement for the dual-frequency operation modes with central frequencies of 900 MHz and 1800 MHz, for example, can be achieved.
  • the radiation arms ARM1 and ARM2 of the antenna body 100 is designed in the form of a symmetrically inward spiral structure, as depicted in FIG. 1B.
  • Symmetrically inward spiral structure means that the current paths created by the two radiation arms both spiral inwardly; the radiation arm ARM1 extends dextrorotarily, and the radiation arm ARM2 extends levorotarily. Because both extensions of the radiation arms go inwardly, the lengths of the current paths can be increased in the limited space and therefore the size of the antenna can be effectively reduced.
  • a patch antenna can be disposed next to the antenna body to obtain more flexibility for the application of the antenna.
  • a patch antenna 200 has a feed-in terminal FD', and a ground terminal GND'.
  • the current path L3 created from the feed-in terminal FD' allows the patch antenna 200 to have a third operational frequency f that is different to both the operational frequencies f H and f L .
  • the length of the current path L3 can be designed for the bandwidth of blue tooth signal by setting f to 2.45 GHz in order to meet the requirement for Bluetooth communication.
  • FIG. 3A depicts the arrangement of the antenna body 100, the patch antenna 200, and ground plane GPLN of the multi-frequency antenna.
  • the antenna body 100 and the patch antenna 200 are disposed nearly.
  • the antenna body 100 and the patch antenna 200 are disposed at a distance of about 1 to 7 mm in order to be coupled to PCS bandwidth.
  • the ground plane GPLN indicated by the dashed line, is electrically coupled to the ground terminals GND and GND', is beneath the antenna body 100 and the patch antenna 200.
  • the electric field radiates from the antenna in the endfire direction E.
  • a section of the ground plane GPLN can be hollowed, or cut off, as depicted in FIG. 3B, for example.
  • the hollowed section is shown as the area enclosed by the dashed line
  • the area of the actual ground plane GPLN' is less than that of the original ground plane GPLN, whereby the antenna bandwidth can be increased.
  • the space saved by the hollowed section can be used to dispose other components, such as slots for interface cards, to better utilize the available room in a circuit board and increase the component density.
  • FIG. 4 charts the measurement result of the return loss of the antenna body 100. If the operational bandwidth is defined by the voltage standing wave ratio (VSWR) having a value less than 3, the antenna body 100 certainly satisfies the design requirements of both GSM bandwidth and DCS bandwidth, especially for high frequency.
  • FIG. 5 charts the measurement result of the return loss of the patch antenna 200. If the operational bandwidth is defined by S11 having a value less than -10dB, the characteristics of the patch antenna 200 meet the requirement for Bluetooth signaling according to the frequency range set in the Bluetooth standard.
  • VSWR voltage standing wave ratio
  • the multi-frequency antenna proposed by the invention has at least the following advantages.
  • the symmetrically inward spiral structure adopted in the antenna body effectively reduces the size of the antenna.
  • the design of hollowing the section of the ground plane increases the bandwidth of the antenna and the hollowed section can be used to provide space for other components in order to increase the component density.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
EP04002213.9A 2004-02-02 2004-02-02 Mehrfrequenzantenne Expired - Lifetime EP1560287B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04002213.9A EP1560287B1 (de) 2004-02-02 2004-02-02 Mehrfrequenzantenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04002213.9A EP1560287B1 (de) 2004-02-02 2004-02-02 Mehrfrequenzantenne

Publications (2)

Publication Number Publication Date
EP1560287A1 true EP1560287A1 (de) 2005-08-03
EP1560287B1 EP1560287B1 (de) 2013-04-17

Family

ID=34639435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04002213.9A Expired - Lifetime EP1560287B1 (de) 2004-02-02 2004-02-02 Mehrfrequenzantenne

Country Status (1)

Country Link
EP (1) EP1560287B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1858113A1 (de) * 2006-05-19 2007-11-21 AMC Centurion AB Antenneneinrichtung und tragbares Funkkommunikationsgerät mit einer solchen Antenneneinrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6166694A (en) 1998-07-09 2000-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Printed twin spiral dual band antenna
EP1079462A2 (de) 1999-08-25 2001-02-28 Filtronic LK Oy Planare Antennenstruktur
WO2001020714A1 (en) * 1999-09-10 2001-03-22 Galtronics Ltd. Broadband or multi-band planar antenna
WO2002005382A1 (en) 2000-07-10 2002-01-17 Allgon Mobile Communications Ab Antenna arrangement and a portable radio communication device
US20020089454A1 (en) 2000-10-13 2002-07-11 Steve Eggleston Antenna transducer assembly, and an associated method therefor
US20030160728A1 (en) 2001-03-15 2003-08-28 Susumu Fukushima Antenna apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6408190B1 (en) * 1999-09-01 2002-06-18 Telefonaktiebolaget Lm Ericsson (Publ) Semi built-in multi-band printed antenna

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6166694A (en) 1998-07-09 2000-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Printed twin spiral dual band antenna
EP1079462A2 (de) 1999-08-25 2001-02-28 Filtronic LK Oy Planare Antennenstruktur
WO2001020714A1 (en) * 1999-09-10 2001-03-22 Galtronics Ltd. Broadband or multi-band planar antenna
WO2002005382A1 (en) 2000-07-10 2002-01-17 Allgon Mobile Communications Ab Antenna arrangement and a portable radio communication device
US20020089454A1 (en) 2000-10-13 2002-07-11 Steve Eggleston Antenna transducer assembly, and an associated method therefor
US20030160728A1 (en) 2001-03-15 2003-08-28 Susumu Fukushima Antenna apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FU-REN HSIAO ET AL.: "MICROWAVE AND OPTICAL TECHNOLOGIEY LETTERS", vol. 32, 20 February 2002, JOHN WILEY, article "A dual-band planar inverted-F patch antenna with a branch-line slit", pages: 310 - 312

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1858113A1 (de) * 2006-05-19 2007-11-21 AMC Centurion AB Antenneneinrichtung und tragbares Funkkommunikationsgerät mit einer solchen Antenneneinrichtung

Also Published As

Publication number Publication date
EP1560287B1 (de) 2013-04-17

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