EP1560287B1 - Mehrfrequenzantenne - Google Patents

Mehrfrequenzantenne Download PDF

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Publication number
EP1560287B1
EP1560287B1 EP04002213.9A EP04002213A EP1560287B1 EP 1560287 B1 EP1560287 B1 EP 1560287B1 EP 04002213 A EP04002213 A EP 04002213A EP 1560287 B1 EP1560287 B1 EP 1560287B1
Authority
EP
European Patent Office
Prior art keywords
antenna
operational frequency
frequency
bandwidth
electronic 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.)
Expired - Lifetime
Application number
EP04002213.9A
Other languages
English (en)
French (fr)
Other versions
EP1560287A1 (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
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HTC Corp
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Filing date
Publication date
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Priority to EP04002213.9A priority Critical patent/EP1560287B1/de
Publication of EP1560287A1 publication Critical patent/EP1560287A1/de
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Publication of EP1560287B1 publication Critical patent/EP1560287B1/de
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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 in the antenna ' s material need to be met.
  • the overall quality of the antenna is closely related to these conditions.
  • One end of the wider portion of the slot is close to the feed point of the radiating element.
  • the narrower portion of the slot starts from a point in the wider portion and extends to the edge of the radiating element.
  • the portions of the slot are advantageously straight.
  • the order of magnitude of the ratio of the widths of the portions is three.
  • a built-in antenna which includes two spiral conductor arms which are of different lengths and capable of being tuned to different frequency bands.
  • the spiral arms are mounted on the mobile terminal's printed circuit board via a substrate.
  • Matching of the antenna is performed by a matching bridge which is positioned between a feeding pin and grounded post. By adjusting the length of the matching bridge, the matching of the antenna can be changed.
  • a loading resistor is attached to the matching bridge in order to enhance the bandwidth of the antenna.
  • an antenna arrangement for a portable radio communication device comprising a first and a second antenna element, and a conductive shield connectable to a ground plane device, said first and second antenna elements are located on opposite sides of the shield, wherein said first and second antenna elements are of different types.
  • the mobile station also includes GPS receive circuitry for receiving and operating upon GPS (global positioning system) signals.
  • the antenna transducer includes a primary antenna transducer portion for transducing signals generated to effectuate a communication service in the cellular communication system.
  • the antenna transducer includes a second antenna transducer portion for transducing GPS signals transmitted to the mobile station.
  • the primary and second antenna transducer portions are disposed upon a common substrate, and the second antenna transducer portion exhibits circular polarization characteristics.
  • a small antenna device having a wide frequency band suitable for being built in mobile communications apparatus.
  • This antenna device includes a planar radiating element (radiating plate) and a grounding plate provided in parallel to and facing the radiating plate.
  • a feeding line is disposed at approximately the end center of the radiating plate, and supplies high-frequency signals.
  • a shorting portion shorts the radiating plate and grounding plate at near the feeding line.
  • a slit is provided at an end face of the radiating plate approximately opposing the feeding line to form two resonators.
  • a coupling level between two resonators is optimized by adjusting the shape or dimensions of this slit, or loading a reactance element or conductive plate on this slit.
  • WO01/17063 provides a miniature, built-in multi-band antenna which is suitable for use in compact mobile terminals.
  • a semi built-in printed antenna is provided which includes patch elements of different sizes and capable of being tuned to different frequency bands. To broaden bandwidth, one of the patches is at least extended beyond the ground plane.
  • the embedded branch-line slit has two branch slits (one long folded slit and one short bent slit) protruding from the main slit which has an open and at the patch boundary.
  • the main slit and the long folded branch slit together strongly meander the excited patch surface currents starting from the feed to the portion of the patch encircled by the folding branch slit, which leads to a significant reduction in the required dimensions for the proposed antenna.
  • the present invention relates to a multi-frequency antenna as defined in claim 1. Further, the present invention relates to a portable electronic device as defined in claim 4.
  • 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.
  • 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 (Global System for Mobile Communication) bandwidth (824-960 MHz)
  • the operational frequency f H can be set within the PCS (Personal Communication System) 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 from the feed-in point to a center region of the antenna radiator, 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 (Digital Communication System) 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.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)

Claims (11)

  1. Eine Mehrfrequenzantenne mit einer ersten Betriebsfrequenz und einer zweiten Betriebsfrequenz für eine tragbare Elektronikeinrichtung, wobei die Mehrfrequenzantenne umfasst:
    eine Massefläche (GPLN') und einen Antennenstrahler (100), der parallel zu der Massefläche angeordnet ist und einen Einspeiseanschluss (FD) aufweist, einen Masseanschluss (GND), der elektrisch mit der Massefläche (GPLN') verbunden ist, und einen ersten und einen zweiten Strahlungsarm (ARM1, ARM2), die beide in Spiralform angeordnet und an dem Einspeiseanschluss miteinander verbunden sind und einen ersten Strompfad (L1) und einen zweiten Strompfad (L2) bilden, die entsprechend die erste Betriebsfrequenz und die zweite Betriebsfrequenz einrichten, wobei die Mehrfrequenzantenne dadurch gekennzeichnet ist, dass der Antennenstrahler (100) einen symmetrischen Aufbau in Bezug auf eine Mittellinie des Antennenstrahlers (100) besitzt,
    dass der Einspeiseanschluss (FD) auf einer Seite der Mittellinie versetzt zu dieser angeordnet ist,
    dass der erste Arm (ARM1) an der einen Seite der Mittellinie angeordnet ist und sich von dem Einspeiseanschluss (ST) zu einem mittleren Gebiet des Antennenstrahlers (100) einwärts windet,
    dass der zweite Arm (ARM2) sich von dem Einspeiseanschluss (FD) zu der anderen Seite der Mittellinie, die gegenüberliegend zu der einen Seite angeordnet ist, erstreckt und sich von der anderen Seite der Mittellinie symmetrisch zu dem ersten Arm (ARM1) einwärts windet, und
    dass die Grundfläche (GPLN') einen ausgesparten Abschnitt unter der Längsstrahlrichtung (E) der Antenne derart aufweist, dass der erste und der zweite Arm (ARM1, ARM2) sich teilweise über die Massefläche (GPLN') in der Längsstrahlrichtung (E) hinaus erstrecken.
  2. Die Mehrfrequenzantenne gemäß Anspruch 1, wobei die erste Betriebsfrequenz in der GSM-Bandbreite liegt und die zweite Betriebsfrequenz in der DCS-Bandbreite liegt.
  3. Die Mehrfrequenzantenne gemäß Anspruch 1, wobei die erste Betriebsfrequenz in der GSM-Bandbreite liegt und die zweite Betriebsfrequenz in der DCS-Bandbreite liegt.
  4. Eine tragbare Elektronikeinrichtung mit einer ersten Betriebsfrequenz, einer zweiten Betriebsfrequenz und einer dritten Betriebsfrequenz, wobei die tragbare Elektronikeinrichtung umfasst:
    eine Mehrfrequenzantenne gemäß Anspruch 1; und
    eine Flächenantenne (200), die separat auf einer Seite der Mehrfrequenzantenne angeordnet ist und einen dritten Strompfad zum Einrichten der dritten Betriebsfrequenz aufweist.
  5. Die tragbare Elektronikeinrichtung gemäß Anspruch 4, wobei die erste Betriebsfrequenz in der GSM-Bandbreite liegt, die zweite Betriebsfrequenz in der DCS-Bandbreite liegt und die dritte Betriebsfrequenz 2,45 GHz beträgt.
  6. Die tragbare Elektronikeinrichtung gemäß Anspruch 4, wobei der Antennenstrahler (100) und die Flächenantenne (200) mit einem Abstand von ungefähr 1 bis 7 mm angeordnet sind.
  7. Die tragbare Elektronikeinrichtung gemäß Anspruch 6, wobei der erste Strompfad eine Länge besitzt, die die erste Betriebsfrequenz in der GSM-Bandbreite festlegt, und der zweite Strompfad eine Länge besitzt, die die zweite Betriebsfrequenz in der PCS-Bandbreite festlegt.
  8. Die tragbare Elektronikeinrichtung gemäß Anspruch 6, wobei der dritte Strompfad (L3) die dritte Betriebsfrequenz so festgelegt, dass die Anforderung für Bluetooth-Kommunikation erfüllt ist.
  9. Die tragbare Elektronikeinrichtung gemäß Anspruch 4, wobei der erste Strompfad (L1) die erste Betriebsfrequenz in der GSM-Bandbreite festlegt, und der zweite Strompfad (L2) die zweite Betriebsfrequenz in der DCS-Bandbreite festlegt.
  10. Die tragbare Elektronikeinrichtung gemäß Anspruch 4, wobei der dritte Strompfad (L3) die dritte Betriebsfrequenz so festgelegt, dass die Anforderung für Bluetooth-Kommunikation erfüllt ist.
  11. Die tragbare Elektronikeinrichtung gemäß Anspruch 10, wobei die erste Betriebsfrequenz in der GSM-Bandbreite liegt, die zweite Betriebsfrequenz in der DCS-Bandbreite liegt und die dritte Betriebsfrequenz 2,45 GHz beträgt.
EP04002213.9A 2004-02-02 2004-02-02 Mehrfrequenzantenne Expired - Lifetime EP1560287B1 (de)

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EP04002213.9A EP1560287B1 (de) 2004-02-02 2004-02-02 Mehrfrequenzantenne

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

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

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Families Citing this family (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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001017063A1 (en) * 1999-09-01 2001-03-08 Telefonaktiebolaget Lm Ericsson (Publ) Semi built-in multi-band printed antenna
US20030160728A1 (en) * 2001-03-15 2003-08-28 Susumu Fukushima Antenna apparatus

Family Cites Families (5)

* 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
FI112982B (fi) 1999-08-25 2004-02-13 Filtronic Lk Oy Tasoantennirakenne
WO2001020714A1 (en) * 1999-09-10 2001-03-22 Galtronics Ltd. Broadband or multi-band planar antenna
SE516842C2 (sv) 2000-07-10 2002-03-12 Allgon Ab Antennanordning för en bärbar radiokommunikationsanordning
US6618011B2 (en) 2000-10-13 2003-09-09 Nokia Corporation Antenna transducer assembly, and an associated method therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001017063A1 (en) * 1999-09-01 2001-03-08 Telefonaktiebolaget Lm Ericsson (Publ) Semi built-in multi-band printed antenna
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: "A dual-band planar inverted-F patch antenna with a branch-line slit", MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, JOHN WILEY, NEW YORK, NY, US, vol. 32, no. 4, 20 February 2002 (2002-02-20), pages 310 - 312, XP002246573, ISSN: 0895-2477, DOI: 10.1002/MOP.10163 *

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