EP0470797A2 - Arrangement d'antenne - Google Patents

Arrangement d'antenne Download PDF

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Publication number
EP0470797A2
EP0470797A2 EP91307187A EP91307187A EP0470797A2 EP 0470797 A2 EP0470797 A2 EP 0470797A2 EP 91307187 A EP91307187 A EP 91307187A EP 91307187 A EP91307187 A EP 91307187A EP 0470797 A2 EP0470797 A2 EP 0470797A2
Authority
EP
European Patent Office
Prior art keywords
antenna
elements
inductance
divisions
radio apparatus
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Withdrawn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
EP91307187A
Other languages
German (de)
English (en)
Other versions
EP0470797A3 (en
Inventor
Hiroshi Haruki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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
Priority claimed from JP2212898A external-priority patent/JPH0495403A/ja
Priority claimed from JP2212896A external-priority patent/JPH0495402A/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0470797A2 publication Critical patent/EP0470797A2/fr
Publication of EP0470797A3 publication Critical patent/EP0470797A3/en
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • 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

Definitions

  • the present invention relates to an antenna apparatus for use in radio apparatus.
  • a built-in loop antenna 2 comprised in a radio apparatus cabinet 1 or an inverted-1 type antenna 4 fixedly mounted inside a radio apparatus cabinet 1 as shown in Figs. 1A and 1B.
  • a feeding point 3 supplies electrical power.
  • the conventional first type antenna has however a physical dimension which is much shorter than the wavelength and therefore has a small radiation resistance component to exhibit a single-tuned characteristic of very narrow band.
  • the conventional antenna can cope with a simplex-transmission radio apparatus such as a pocket bell or a wireless microphone; but a single built-in antenna cannot cope with a duplex-transmission radio apparatus such as a portable telephone or a cordless telephone in which different frequencies are used for transmission and reception. Accordingly, for use with the duplex-transmission radio apparatus, an antenna 5 for a transmission frequency (f T ) and an antenna 6 for a reception frequency (f R ) must be incorporated separately as shown in Fig. 2.
  • a whip antenna having a length of about 1/4 wavelength as shown in Fig. 3 or a helical antenna 14 as shown in Fig. 4 meeting requirements of shortened antenna.
  • Denoted by 12 is a feeding point and by 13 a radio apparatus cabinet.
  • the conventional second type antenna is a single-tuned type antenna which has only one resonance frequency.
  • the 1/4 wavelength antenna has a necessarily long length for a particular frequency band in use to impair ease of use of the antenna; and the helical antenna contrived to eliminate the above disadvantage, on the other hand, can be reduced in antenna length but its band becomes narrower in proportion to a reduction in antenna length, having difficulties in covering the band of the duplex transmission type radio apparatus which utilizes different frequencies for transmission and reception.
  • a helical antenna tunable to two different frequencies has been contrived, which is complicated in structure and suffers from low antenna gain.
  • the present invention contemplates elimination of the above drawbacks of the conventional antenna apparatus and its object is to provide a compact antenna apparatus which is tunable to a plurality of frequencies and which has a high antenna gain.
  • a plurality of divisions of antenna elements are formed on a radio apparatus cabinet or on a substrate packaged along the surface of the radio apparatus cabinet, and the divisions of antenna elements are interconnected together by a plurality of inductance elements to cancel a capacitive component of a built-in antenna.
  • a capacitance element is connected in parallel with at least one of the plurality of interconnected inductance elements to form a resonance circuit, thus realizing a built-in antenna which utilizes a characteristic of the resonance circuit so as to be tunable to at least two frequencies.
  • the built-in antenna is formed on the radio apparatus cabinet or the substrate packaged along the cabinet and the interconnection of the plurality of inductance elements makes the built-in antenna tunable to different frequencies. Further, by virtue of the action of the parallel resonance circuit, even a single built-in antenna can behave as an antenna which can be used commonly with at least two different frequencies for transmission and reception.
  • Fig. 5 shows the construction of a first embodiment of the invention.
  • a built-in antenna has a plurality of divisions of antenna elements 21 to 24 formed, through graphic process, on a cabinet 1 of a radio apparatus.
  • the divisions of antenna elements are interconnected by a plurality of inductance elements 25 to 27 which may be formed of inductive lumped constant elements or inductive distributed constant elements.
  • a coapacitance element 28 is connected in parallel with the inductance element 25.
  • 29 is a matching circuit for matching the antenna impedance with the input/output impedance of the radio apparatus, and by 3 is a feeding point.
  • a duplex-transmission type portable radio apparatus has a transmission frequency f T and a receiving frequency f R and f T ⁇ f R is assumed.
  • a resonance circuit comprised of the interconnected inductance element 25 and capacitance element 28 has constant values which are selected such that the resonance circuit can resonante with a higher one f R of the two of transmission and receiving frequencies in use. Therefore, the resonance circuit has such a characteristic that this resonance circuit assumes a high impedance for the receiving frequency f R but behaves as an inductance component for the transmission frequency f T which is lower than f R .
  • the present antenna equivalently operates as an antenna as shown in Fig. 6A for the frequency f T and as an antenna as shown in Fig. 6B for the frequency f R .
  • the antenna elements 21, 22, 23 and 24 and the interconnected inductance elements 25, 26 and 27 which are set up as shown in Fig. 6A can resonate with f T and the antenna elements 22, 23 and 24 and the interconnected inductance elements 26 and 27 which are set up as shown in Fig. 6B can resonate with f R , indicating that even a single built-in antenna can operate to resonate with the two different frequencies for transmision and reception.
  • the inductance element 27 is 27 nH
  • the inductance element 26 is 18 nH
  • the inductance element 25 is 15 nH
  • the capacitance element 28 is 11.7 pF
  • Figs. 7 and 8 show second and third embodiments of the invention, respectively.
  • the antenna has a bent structure and in Fig. 8 the antenna has a folded type structure.
  • the surface of the radio apparatus cabinet 1 is used highly efficiently as an antenna forming surface to promote compactness of the radio apparatus cabinet 1.
  • the antenna elements are formed, through graphic process, on the radio apparatus cabinet, they may alternatively be formed on the surface of a substrate packaged along the surface of the radio apparatus cabinet.
  • the capacitance element is described as being connected in parallel with one inductance element but capacitance elements may be connected in parallel with the plurality of inductance elements, respectively, and constant values may be set such that the respective resonance circuits have different resonance frequencies, thus making it possible to perform transmission/reception through a multifrequency band of three or more frequencies.
  • the preset invention can attain the following beneficial effects.
  • the built-in antenna for common use with two or multi-frequencies which cannot be realized with the conventional antennas, can be materialized without impairing the high sensitivity characteristic.
  • Fig. 9 shows the construction of a fourth embodiment of the invention and Fig. 10 shows the external appearance of the antenna apparatus of the fourth embodiment.
  • a linear antenna shorter than the wavelength is divided into a plurality of antenna elements 31 to 34. Divisions of the antenna elements are interconnected by inductance elements 35 to 37 having inductive inductance which may be formed of lumped constant elements or distributed constant elements. A capacitance element 38 is connected in parallel with the inductance element 35. A matching circuit 39 is adapted to match the antenna impedance with that of the radio apparatus. Denoted by 40 is a feeding point, by 41 a radio apparatus cabinet, and by 42 is an antenna.
  • a duplex-transmission type radio apparatus has a transmission frequency f T and a receiving frequency f R and f T ⁇ f R is assumed.
  • a resonance circuit comprised of the interconnected inductance element 35 and capacitance element 38 has constant values which are selected such that the resonance circuit can resonate with a higher one f R of the two of transmission and receiving frequencies in use. Therefore, the resonance circuit has such a characteristic that this resonance circuit assumes a high impedance for the receiving frequency f R but behaves as an inductance component for the transmission frequency f T which is lower than f R .
  • the present antenna equivalently operates as an antenna as shown in Fig. 11A for the frequency f T used and as an antenna as shown in Fig. 11B for the frequency f R used.
  • the antenna elements 31, 32, 33 and 34 and the interconnected inductance elements 35, 36 and 37 can resonate with f T and the antenna elements 32, 33 and 34 and the interconnected inductance elements 36 and 37 can resonate with f R , indiacting that even a compact antenna shorter than the wavelength can exhibit such a characteristic that the antenna can resonate with two frequencies.
  • Fig. 12 shows a fifth embodiment of the invention.
  • the number of capacitance elements for parallel connection is increased such that three capacitance elements 38, 42 and 43 are connected in parallel with inductance elements 35, 36 and 37, materializing an antenna which can resonate with four frequencies.
  • a single antenna can be used commonly for four different transmission/reception frequencies utilized inside a radio apparatus cabinet 41 and the employment of a plurality of antennas can be dispensed with.
  • the number of frequencies with which the antenna can resonate can be increased.
  • the present invention can attain the following beneficial effects.
  • the above advantages (1) and (2) can eliminate drawbacks inevitably concomitant with reducing the size of the antenna and are effective to provide an antenna indispensable for realization of a compact portable radio apparatus.
  • the application can further be extended to, for example, a car antenna which is required to be a single antenna having ability to receive a plurality of waves such as AM, FM and TV waves.
  • an antenna 51 has a printed wiring board 52 in the form of a film on which substantially ⁇ letter shaped antenna elements 53 and 54 are formed face to face in staggered fashion and linear antenna elements 55 and 56 are formed using print pattern technique.
  • the elements 55 and 53, the elements 53 and 54 and the elements 54 and 56 are respectively connected together by coils 57 which are packaged on the surface to prolong the length of the antenna.
  • This antenna 51 is provided on the surface of a cabinet 59 of a radio apparatus 58 and connected to transmitting and receiving circuits of the radio apparatus 58.
  • Fig. 14 is a circuit diagram showing an equivalent circuit of the antenna 51.
  • the same components as those in Fig. 12 are designated by the same reference numerals.
  • Transmission and reception of an electric wave E is effected by means of the antenna elements 53 to 57 and the coils 57.
  • the antenna 51 of the invention constructed as above can be reduced in antenna length by virtue of the surface packaged type coils 57 as in the case of the conventional, helical whip antenna and besides can be reduced in size by virtue of the substantially ⁇ letter shape antenna elements 53 to 56 formed face to face in staggered fashion.
  • the printed wiring board 52 on which the antenna elements 53 to 56 are formed has the form of a film which can be shaped freely and upon mounting to the cabinet 59, can be bent and rounded to drastically improve the degree of freedom of packaging the film to the radio apparatus 58 and permit size reduction, weight reduction and freedom of shape design of the radio apparatus.
  • two ⁇ letter shape antenna elements are used to construct the antenna but the number of the antenna elements used is not limited to two and may be set suitably in accordance with frequencies used.
  • the antenna of the invention can be reduced in size so as to be tailored to its application to the portable type mobile radio apparatus which is required to be compact and light; and the printed wiring board on which the antenna elements are formed is in the form of a film which can be shaped freely and upon mounting to the cabinet, can be bent or rounded to drastically improve the degree of freedom of packaging the film to the radio apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)
EP19910307187 1990-08-10 1991-08-05 Antenna apparatus Withdrawn EP0470797A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP212896/90 1990-08-10
JP2212898A JPH0495403A (ja) 1990-08-10 1990-08-10 アンテナ装置
JP212898/90 1990-08-10
JP2212896A JPH0495402A (ja) 1990-08-10 1990-08-10 アンテナ装置

Publications (2)

Publication Number Publication Date
EP0470797A2 true EP0470797A2 (fr) 1992-02-12
EP0470797A3 EP0470797A3 (en) 1992-05-13

Family

ID=26519484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910307187 Withdrawn EP0470797A3 (en) 1990-08-10 1991-08-05 Antenna apparatus

Country Status (1)

Country Link
EP (1) EP0470797A3 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520197A2 (fr) * 1991-06-25 1992-12-30 Hagenuk Gmbh Antenne à feuille
US5555459A (en) * 1992-03-27 1996-09-10 Norand Corporation Antenna means for hand-held data terminals
EP0896384A2 (fr) * 1997-08-07 1999-02-10 Tokin Corporation Antenne multibande utilisable dans un dispositif de radiocommunication mobile
US6100847A (en) * 1995-10-06 2000-08-08 Nokia Mobile Phones Limited Antenna with a transmit frequency band pass filter coupled to a radiative element
WO2001069716A1 (fr) * 2000-03-15 2001-09-20 Asulab S.A. Antenne multifrequence pour instrument de petit volume
FR2926420A1 (fr) * 2008-01-15 2009-07-17 Purple Labs Soc Par Actions Si Appareil mobile comportant une antenne pour un recepteur radio frm.
EP2080247A1 (fr) * 2006-10-02 2009-07-22 Airgain, Inc. Antenne multiélément compacte avec déphasage
CN101098040B (zh) * 2007-05-29 2011-07-06 东南大学 平面转折射频袖珍隐形天线
US9219315B2 (en) 2010-06-08 2015-12-22 Cojot Oy Combination antenna

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229865A (en) * 1938-07-25 1941-01-28 Transcontinental & Western Air Radio antenna system
DE3306054A1 (de) * 1983-02-22 1984-08-23 Meier Meßtechnik, 3400 Göttingen Folien-antenne
US4675687A (en) * 1986-01-22 1987-06-23 General Motors Corporation AM-FM cellular telephone multiband antenna for motor vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229865A (en) * 1938-07-25 1941-01-28 Transcontinental & Western Air Radio antenna system
DE3306054A1 (de) * 1983-02-22 1984-08-23 Meier Meßtechnik, 3400 Göttingen Folien-antenne
US4675687A (en) * 1986-01-22 1987-06-23 General Motors Corporation AM-FM cellular telephone multiband antenna for motor vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY vol. 39, no. 2, May 1990, NEW YORK, US pages 150 - 160; KUBOYAMA, H. ET AL.: 'Experimental Results with Mobile Antennas Having Cross-Polarization Components in Urban and Rural Areas' *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0520197A3 (fr) * 1991-06-25 1994-10-12 Hagenuk Telecom Gmbh Antenne à feuille.
EP0520197A2 (fr) * 1991-06-25 1992-12-30 Hagenuk Gmbh Antenne à feuille
US5555459A (en) * 1992-03-27 1996-09-10 Norand Corporation Antenna means for hand-held data terminals
US6100847A (en) * 1995-10-06 2000-08-08 Nokia Mobile Phones Limited Antenna with a transmit frequency band pass filter coupled to a radiative element
SG92615A1 (en) * 1997-08-07 2002-11-19 Nec Tokin Corp Multi-band antenna suitable for use in a mobile radio device
EP0896384A2 (fr) * 1997-08-07 1999-02-10 Tokin Corporation Antenne multibande utilisable dans un dispositif de radiocommunication mobile
EP0896384A3 (fr) * 1997-08-07 1999-05-26 Tokin Corporation Antenne multibande utilisable dans un dispositif de radiocommunication mobile
WO2001069716A1 (fr) * 2000-03-15 2001-09-20 Asulab S.A. Antenne multifrequence pour instrument de petit volume
US6642895B2 (en) 2000-03-15 2003-11-04 Asulab S.A. Multifrequency antenna for instrument with small volume
EP2080247A1 (fr) * 2006-10-02 2009-07-22 Airgain, Inc. Antenne multiélément compacte avec déphasage
EP2080247A4 (fr) * 2006-10-02 2009-12-23 Airgain Inc Antenne multiélément compacte avec déphasage
CN101098040B (zh) * 2007-05-29 2011-07-06 东南大学 平面转折射频袖珍隐形天线
FR2926420A1 (fr) * 2008-01-15 2009-07-17 Purple Labs Soc Par Actions Si Appareil mobile comportant une antenne pour un recepteur radio frm.
US9219315B2 (en) 2010-06-08 2015-12-22 Cojot Oy Combination antenna

Also Published As

Publication number Publication date
EP0470797A3 (en) 1992-05-13

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