WO2007066272A2 - Antenne et dispositif comprenant une antenne - Google Patents

Antenne et dispositif comprenant une antenne Download PDF

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Publication number
WO2007066272A2
WO2007066272A2 PCT/IB2006/054570 IB2006054570W WO2007066272A2 WO 2007066272 A2 WO2007066272 A2 WO 2007066272A2 IB 2006054570 W IB2006054570 W IB 2006054570W WO 2007066272 A2 WO2007066272 A2 WO 2007066272A2
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
frequency
conductor
network
frequency band
Prior art date
Application number
PCT/IB2006/054570
Other languages
English (en)
Other versions
WO2007066272A3 (fr
Inventor
Anthony Kerselaers
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007066272A2 publication Critical patent/WO2007066272A2/fr
Publication of WO2007066272A3 publication Critical patent/WO2007066272A3/fr

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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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/38—Vertical arrangement of element with counterpoise
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines

Definitions

  • Antenna and device comprising an antenna
  • the invention relates to an antenna for exchanging first frequency signals in a first frequency band and for rejecting second frequency signals in a second frequency band, and also relates to a device comprising an antenna.
  • Examples of such a device are portable consumer products such as mobile phones and personal digital assistants and further consumer products such as television receivers and further non-consumer products.
  • a prior art antenna is known from WO 2004/027929 Al, which discloses an antenna with a surface dipole.
  • first frequency signals such as television signals in a first frequency band such as an ultra high frequency band (for example 300-900 MHz) can be exchanged.
  • second (higher) frequency signals such as mobile phone signals in a second frequency band such as a mobile phone band (for example 900- 1000 MHz)
  • a low pass filter and a band pass filter are located between the antenna and its amplifiers on the one hand and an electronic unit on the other hand.
  • a high pass filter is located between the antenna-arms.
  • the known antenna is disadvantageous, inter alia, owing to the fact that it requires filters to reject the second frequency signals in the second frequency band. So, the prior art antenna depends relatively much on filters for rejecting unwanted signals.
  • a further object of the invention is, inter alia, to provide a device comprising an antenna that relatively little depends on filters for rejecting unwanted signals.
  • the antenna according to the invention for exchanging first frequency signals in a first frequency band and for rejecting second frequency signals in a second frequency band is defined by comprising a first antenna-arm and a second antenna-arm, the first antenna-arm comprising first and second conductors, ends of the first and second conductors constituting an open antenna-end, the other end of the first conductor constituting a first feeding point, the other end of the second conductor being coupled via a network to a connection point and the second antenna-arm comprising a second feeding point.
  • the antenna according to the invention has got a construction with a rejecting function for rejecting the second frequency signals.
  • the combination of the first and second antenna-arms defines the first frequency band
  • the first antenna-arm comprising the two conductors defines the second frequency band.
  • the ends of the two conductors should form a so- called open antenna-end, and, in case the first feeding point is coupled to a receiving and/or transmitting unit, the second feeding point and the connection point are to be coupled to and/or form for example a reference potential point such as ground.
  • the reason that the combination of the two conductors will reject the second frequency signals is that the second conductor will at least partly compensate the first conductor.
  • the antenna according to the invention is further advantageous, inter alia, in that it depends relatively little on discrete components that either have large tolerances at a low cost price or have small tolerances at a high cost price.
  • An antenna for exchanging first frequency signals in a first frequency band and for rejecting second frequency signals in a second frequency band is an antenna such that a return loss for the first frequency signals is lower than a return loss for the second frequency signals and/or is such that a power rejection for the first frequency signals is much lower than a power rejection for the second frequency signals.
  • An embodiment of the antenna according to the invention is defined by the first conductor being an inner conductor of a coaxial transmission line and the second conductor being an outer conductor of the coaxial transmission line.
  • the compensation of the first and inner conductor by the second and outer conductor will be increased owing to the fact that the second and outer conductor surrounds the first and inner conductor.
  • An embodiment of the antenna according to the invention is defined by the network having a frequency-dependent transfer function.
  • a frequency-dependent transfer function of the network defines a working area for the antenna.
  • An embodiment of the antenna according to the invention is defined by the network comprising a parallel construction of a coil and a capacitor. This is a low cost embodiment that has proven to function well.
  • An embodiment of the antenna according to the invention is defined by the network comprising a tunable construction of at least one frequency-dependent element. A tunable construction of the network defines a tunable working area for the antenna.
  • An embodiment of the antenna according to the invention is defined by the second antenna-arm comprising a conductive plane.
  • a conductive plane can have a further purpose such as carrying a receiving and/or transmitting unit.
  • the conductive plane comprises the connection point and the second feeding point which are preferably located close to each other (at a distance smaller than 10% of a wavelength of the center frequency of the first frequency band) and close to the receiving and/or transmitting unit (at a distance smaller than 25% of a wavelength of the center frequency of the first frequency band).
  • An embodiment of the antenna according to the invention is defined by the length of the second antenna-arm and/or the sum of the lengths of the first and second antenna-arms defining the center frequency of the first frequency band. Both arms do not need to make a 180 degrees angle with respect to each other but may make a smaller angle such as for example 90 or 135 degrees with respect to each other to reduce the size of the construction.
  • An embodiment of the antenna according to the invention is defined by the length of the first and/or second conductor defining the center frequency of the second frequency band. Both conductors do not need to have the same length, the length of the shortest of the two conductors will in that case define the center frequency of the second frequency band. Further, a shorter length of the second conductor will reduce the rejection.
  • the conductors might for example have a length of a quarter of a wavelength or a multiple thereof of the center frequency of the second frequency band.
  • An embodiment of the antenna according to the invention is defined by the network defining the bandwidth of the first frequency band.
  • the network introduces an additional minimum in the return loss transfer function of the antenna and increases the bandwidth of the first frequency band.
  • the device according to the invention comprises the antenna according to the invention and further comprises a receiving and/or transmitting unit.
  • Embodiments of the device according to the invention correspond with the embodiments of the antenna according to the invention.
  • the invention is based upon an insight, inter alia, that external filters should be avoided as much as possible, and is based upon a basic idea, inter alia, that the construction of the antenna should have a rejecting function for rejecting the second frequency signals.
  • the invention solves the problem, inter alia, to provide an antenna that relatively little depends on filters for rejecting unwanted signals, and is advantageous, inter alia, in that it depends relatively little on discrete components that either have large tolerances at a low cost price or have small tolerances at a high cost price.
  • Fig. 1 shows diagrammatically a device according to the invention comprising an antenna according to the invention
  • Fig. 2 shows a network for use in (combination with) the antenna according to the invention
  • Fig. 3 shows a simulated input impedance of the antenna according to the invention
  • Fig. 4 shows a simulated return loss for the antenna according to the invention
  • Fig. 5 shows a simulated received power rejection for the antenna according to the invention
  • Figs. 6 A and 6B show simulated radiation patterns at 750 MHz for the antenna according to the invention
  • Figs. 7 A and 7B show simulated radiation patterns at 470 MHz for the antenna according to the invention.
  • Figs. 8A, 8B, 8C and 8D show measurement results of a practical design of the antenna according to the invention.
  • the device 20 according to the invention shown in Fig. 1 comprises an antenna 10 according to the invention for exchanging first frequency signals in a first frequency band and for rejecting second frequency signals in a second frequency band.
  • the antenna 10 comprises a first antenna-arm and a second antenna-arm.
  • the first antenna-arm comprises a first conductor 1 and a second conductor 2.
  • the first conductor 1 is an inner conductor of a coaxial transmission line and the second conductor 2 is an outer conductor of the coaxial transmission line.
  • the first and second conductors 1 and 2 might be for example wires or substrate copper areas, for example located parallel to each other at a distance of for example at most 10% of a wavelength of the center frequency of the second frequency band.
  • the second antenna-arm comprises a conductive plane 4.
  • the second antenna-arm might be for example a conductor etc.
  • On the conductive plane a receiving and/or transmitting unit 21 has been mounted.
  • the ends of the first and second conductors 1 and 2 constitute an open antenna-end, the other end of the first conductor 1 constitutes a first feeding point 11, the other end of the second conductor 2 constitutes an end point 13 that is coupled via a network 3 to a connection point 14.
  • the second antenna-arm comprises a second feeding point 12.
  • the connection point 14 and the second feeding point 12 are located on the conductive plane 4 and are preferably located close to each other (at a distance smaller than 10% of a wavelength of the center frequency of the first frequency band) and close to the receiving and/or transmitting unit 21 (at a distance smaller than 25% of a wavelength of the center frequency of the first frequency band).
  • the network 3 might have a frequency-dependent transfer function and might thereto for example comprise a parallel construction of a coil and a capacitor as shown in Fig. 2.
  • the network 3 might comprise a tunable construction of at least one frequency- dependent element such as a tunable coil or a tunable capacitor.
  • the network 3 defines the bandwidth of the first frequency band.
  • the network 3 introduces an additional minimum in the return loss transfer function of the antenna 10 and increases the bandwidth of the first frequency band as shown in Fig. 4.
  • the length of the second antenna-arm and/or the sum of the lengths of the first and second antenna-arms defines the center frequency of the first frequency band.
  • the electrical length of the conductive plane is preferably equal to a quarter of the wavelength of the center frequency of the first frequency band.
  • the sum of the lengths of the conductive plane 4 and the first conductor 1 is preferably proportional to a half of the wavelength of the center frequency of the first frequency band as long as both antenna-arms make an angle of 180 degrees.
  • the length of the first and/or second conductor 1 and/or 2 such as for example the length of the shortest of the two conductors 1 and 2 defines the center frequency of the second frequency band.
  • the electrical length is preferably equal to a quarter of the wavelength or a multiple thereof of the center frequency of the second frequency band.
  • Fig. 3 shows a simulated input impedance of the antenna 10 according to the invention
  • Fig. 4 shows a simulated return loss for the antenna 10 according to the invention
  • Fig. 5 shows a simulated received power rejection for the antenna 10 according to the invention.
  • Figs. 6 A and 6B show simulated radiation patterns at 750 MHz for the antenna 10 according to the invention.
  • Fig. 6A shows the radiation pattern in a plane perpendicular to the longitudinal direction of the antenna 10
  • Fig. 6B shows the radiation pattern in a plane along the longitudinal direction of the antenna 10.
  • Figs. 7A and 7B show simulated radiation patterns at 470 MHz for the antenna 10 according to the invention.
  • Figs. 8 A, 8B, 8C and 8D show measurement results of a practical design of the antenna 10 according to the invention.
  • the antenna 10 for example has as an object to provide a wide input impedance bandwidth for example from 470 to 830 MHz, while rejecting signals for example from 890 to 960 MHz.
  • This broadband antenna is a combination of the first and second conductors 1 and 2 (for example in a coaxial transmission line structure) and the conductive plane 4 (a conductive structure) with the network 3 coupled between the second conductor 2 and the conductive plane 4.
  • the first and second conductors 1 and 2 are open at one end and provide the first feeding point 11 and a network connection point 14 at the other end.
  • the first and second feeding points 11 and 12 are provided to transfer RF signal power at one end of the inner conductor of the coaxial transmission line and at the end side of the conductive plane 4.
  • the first and second feeding points 11 and 12 are further connected to the receiving and/or transmitting unit 21 such as a radio communication device.
  • the conductive plane 4 is for example a printed circuit board.
  • the network 3 makes it possible to have an antenna 10 with a broadband input impedance while rejecting unwanted frequencies.
  • the second feeding point 12 and the connection point 14 for example are coupled to and/or correspond with a reference potential point such as ground.
  • Fig. 3 is a chart of a simulated input impedance of the broadband antenna of Fig. 1 and 2.
  • Fig. 4 is a chart of simulated return loss of the broadband antenna of Fig. 1 and 2. It can be seen from Fig. 4 that the input impedance bandwidth is 200 MHz for -10 dB return loss and 280 MHz for -5 dB return loss.
  • Fig. 5 is a chart of the simulated signal rejection of the broadband antenna of Fig. 1 and 2. As can be seen on Fig. 5 the rejection between 890 to 960 MHz is 15 dB.
  • Figs. 8A, 8B, 8C and 8D show practical measurements of a DVB-H antenna for a portable product.
  • the network used in this design is of the type of Fig. 2.
  • Fig. 8A is a plot of the real part of the input impedance of the antenna
  • Fig. 8B is a plot of the imaginary part of the input impedance of the antenna
  • Fig. 8C is a plot of the input impedance of the antenna on a Smith chart
  • Fig. 8D is a plot of the input return loss of the antenna.
  • a first series resonance (703 MHz) results from the resonance of the transmission line and conductive plane.
  • a second parallel resonance is located at 320 MHz and a third parallel resonance is located at 900 MHz and results from the combination of the network and the transmission line.
  • the network is inductive at 320 MHz, capacitive at 830 MHz and highly resistive at 703 MHz. From 703 MHz to 830 MHz the antenna is working as a monopole antenna while above 830 MHz the transmission line is connected mainly capacitive via the capacitor to the conductive plane. Above this frequency the first antenna arm operates more or less like a transmission line, resulting in a non-efficient radiator and providing rejection of signals.

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  • Details Of Aerials (AREA)

Abstract

La présente invention concerne des antennes (10) destinées à échanger des premiers signaux de fréquence en des premières bandes de fréquence et servant à rejeter les seconds signaux de fréquence dans les secondes bandes de fréquence, afin d’éviter un ou plusieurs filtres. Ces antennes sont dotées d’un premier bras d’antenne qui comprend un premier et un second conducteurs (1, 2) et un second bras d’antenne où les extrémités des premiers et seconds conducteurs (1, 2) constituent ce qu’on appelle une extrémité d’antenne ouverte. De plus, l’autre extrémité du premier conducteur (1) constitue un premier point d’alimentation (11), l’autre extrémité du second conducteur (2) est couplée via un réseau (3) à un point de connexion (14) et le second bras d'antenne comprend un second point d'alimentation (12). Ces antennes (10) disposent d'une construction de filtrage. Les premier et second conducteurs (1, 2) peuvent être des conducteurs externes et internes d’une ligne de transmission coaxiale. Le réseau (3) a une fonction de transfert en fonction de la fréquence et comprend une construction parallèle d’une bobine et d’un condensateur. Le second bras d’antenne comprend un plan conducteur (4).
PCT/IB2006/054570 2005-12-09 2006-12-04 Antenne et dispositif comprenant une antenne WO2007066272A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05111888 2005-12-09
EP05111888.3 2005-12-09

Publications (2)

Publication Number Publication Date
WO2007066272A2 true WO2007066272A2 (fr) 2007-06-14
WO2007066272A3 WO2007066272A3 (fr) 2007-09-27

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PCT/IB2006/054570 WO2007066272A2 (fr) 2005-12-09 2006-12-04 Antenne et dispositif comprenant une antenne

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114498041A (zh) * 2020-10-27 2022-05-13 华为技术有限公司 一种传输线组件、天线组件和移动终端

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529213A (en) * 1947-03-10 1950-11-07 American Phenolic Corp Ground plane antenna
EP1211750A2 (fr) * 2000-11-30 2002-06-05 Kabushiki Kaisha Toshiba Dispositif radio à une antenne
US6441791B1 (en) * 2000-08-21 2002-08-27 Nippon Sheet Glass Co., Ltd. Glass antenna system for mobile communication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529213A (en) * 1947-03-10 1950-11-07 American Phenolic Corp Ground plane antenna
US6441791B1 (en) * 2000-08-21 2002-08-27 Nippon Sheet Glass Co., Ltd. Glass antenna system for mobile communication
EP1211750A2 (fr) * 2000-11-30 2002-06-05 Kabushiki Kaisha Toshiba Dispositif radio à une antenne

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BAKHTIARI S ET AL: "ANALYSIS OF RADIATION FROM AN OPEN-ENDED COAXIAL LINE INTO STRATIFIED DIELECTRICS" IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 42, no. 7, PART 1, 1 July 1994 (1994-07-01), pages 1261-1267, XP000457491 ISSN: 0018-9480 *
YOUNG C NOH ET AL: "Radiation from a Flanged Coaxial Line into a Dielectric Slab" IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 47, no. 11, November 1999 (1999-11), XP011037784 ISSN: 0018-9480 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114498041A (zh) * 2020-10-27 2022-05-13 华为技术有限公司 一种传输线组件、天线组件和移动终端
CN114498041B (zh) * 2020-10-27 2023-09-22 华为技术有限公司 一种传输线组件、天线组件和移动终端

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