WO2010067215A1 - Système d’antennes reconfigurable pour un récepteur sans fil - Google Patents

Système d’antennes reconfigurable pour un récepteur sans fil Download PDF

Info

Publication number
WO2010067215A1
WO2010067215A1 PCT/IB2009/054871 IB2009054871W WO2010067215A1 WO 2010067215 A1 WO2010067215 A1 WO 2010067215A1 IB 2009054871 W IB2009054871 W IB 2009054871W WO 2010067215 A1 WO2010067215 A1 WO 2010067215A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
circuitry
state
antenna system
coupling means
Prior art date
Application number
PCT/IB2009/054871
Other languages
English (en)
Inventor
Ernst Bressau
Kam Choon Kwong
Pieter Lok
Original Assignee
Nxp B.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 Nxp B.V. filed Critical Nxp B.V.
Publication of WO2010067215A1 publication Critical patent/WO2010067215A1/fr

Links

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
    • 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
    • H01Q1/244—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 extendable from a housing along a given path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system

Definitions

  • the invention relates to an apparatus with an antenna system, circuitry, and coupling means between the antenna system and the circuitry for coupling the antenna system to the circuitry.
  • the invention also relates to such coupling means.
  • GB 2347560 discloses a radio apparatus with a transceiver.
  • the apparatus comprises an internal antenna, mounted inside a housing, and an external antenna, arranged to extend away from the housing.
  • the antennae are electrically coupled.
  • the external antenna can be a retractable monopole antenna, e.g. a whip antenna.
  • the internal antenna can be a rectangular element, grounded at one corner and spaced from a ground plane. When the external antenna is in its extended position, it is electrically coupled to the internal antenna, in such a way so that the two antennae form a single dipole antenna. When the external antenna is retracted, it is not coupled to the internal antenna, and only the external antenna is coupled to the feed.
  • a coupling member is provided to electrically couple the antennae when the external antenna is in its extended position, and to electrically decouple the antennae when the external antenna is in its retracted position.
  • GB 2347560 does not describe the coupling member other than that it can be implemented using galvanic, capacitive or inductive means for electrically coupling the antennae.
  • the reconf ⁇ gurable antenna system of the known apparatus has a problem, in that it will lead, in operational use, to a poor impedance matching between the transceiver and the antenna system in at least the extended state of the external antenna or the retracted state of the external antenna.
  • the transceiver itself of the known apparatus is not modified in dependence on the state of the external antenna.
  • the inventors therefore propose to reconfigure the electrical properties of the coupling between the antenna system and the further circuitry (e.g., receiver, transmitter or transceiver) under control of the state of the antenna system.
  • the further circuitry e.g., receiver, transmitter or transceiver
  • the invention relates to an apparatus that comprises an antenna system for at least one of receiving or transmitting an electromagnetic signal.
  • the apparatus also has circuitry for at least processing or generating the signal, and coupling means between the antenna system and the circuitry for coupling the antenna system to the circuitry.
  • the antenna system has a first antenna, a second antenna.
  • the apparatus is configurable to assume a first state or a second state. In the first state, the first antenna is electrically coupled to the circuitry and the second antenna is electrically decoupled from the circuitry, and in the second state, the first and second antennae are electrically coupled to the circuitry.
  • the coupling means is operative to modify an impedance of the antenna system under control of the first state or the second state.
  • the coupling means automatically sees to it that the proper impedance matching is obtained.
  • the antenna configuration controllably switches between a monopole and a higher performance dipole, each using proper matching for optimal performance.
  • the coupling means comprises switching means between the second antenna and the circuitry to selectively couple the second antenna to the circuitry or decouple the second antenna from the circuitry.
  • the switching means comprises e.g., a manual switch for being manually operated, and/or an automatic switch and a sensor to control the automatic switch.
  • the sensor is operative to detect the presence or absence of the second antenna if the latter is removable and can be mounted by the user into a jacket at the housing of the apparatus.
  • the sensor can have any design convenient for this purpose, taking into account the function and configuration of the apparatus.
  • the sensor is operative to detect the presence or absence of the second antenna in a galvanic, electric, magnetic, optical, or mechanical manner.
  • An optical sensor detects whether or not light emitted by, e.g., an LED, is received or not.
  • the jacket for the second antenna is then designed in such a manner that the second antenna blocks the light when mounted to the apparatus.
  • a magnetic sensor can detect the presence and absence of a magnetic field.
  • the second antenna may be designed with a small permanent magnet near its mounting interface of the second antenna so that the magnet is detectable when the second antenna is mounted.
  • a mechanical switch can be designed so as to be mechanically forced into one position by pressing the second antenna into its jacket, and to assume a second position under control of a spring if the second antenna is removed.
  • Another sensor is designed to detect the signal current in the second antenna when mounted to the apparatus, and to thereupon control the switch, etc.
  • the antenna system may function as a monopole antenna in the first state, and as a dipole antenna in the second state.
  • the first antenna may be internal to the apparatus, and the second antenna may extend outside the apparatus in operational use of the second antenna.
  • the second antenna can be designed to be removably connected to the apparatus.
  • the coupling means comprises, e.g., at least one of: a balun, a transformer, and an LC network.
  • Examples of an apparatus of the invention comprise: a mobile or portable digital TV, e.g., operating in a frequency range of 170 MHz - 860 MHZ, VHF III to UHF; a global positioning system (GPS) device such as a navigational aid, a telephone complying with Global System for Mobile communications (GSM) or with Universal Mobile Telecommunications System (UMTS).
  • GPS global positioning system
  • GSM Global System for Mobile communications
  • UMTS Universal Mobile Telecommunications System
  • the invention also relates to coupling means for being used in an apparatus according to the invention.
  • antenna tuners also referred to as transmatch units or antenna tuning units (ATUs).
  • An ATU matches a transceiver with fixed impedance (typically 50 Ohms) to a load impedance (of the combination of feed line and antenna) that is unknown, complex or otherwise does not match. This mismatch usually arises when an antenna is being used that does not have the correct electrical length as compared to the wavelength of the signal.
  • An ATU allows the use of a single antenna for a broad range of frequencies.
  • Fig. 1 is a block diagram of an apparatus in the invention
  • Fig. 2 is a block diagram of a first embodiment of an apparatus in the invention
  • Figs. 3 and 4 are diagrams of a first embodiment of the coupling means;
  • Fig. 5 is a block diagram of a second embodiment of an apparatus in the invention.
  • FIGs. 6 and 7 are diagrams of a second embodiment of the coupling means. Throughout the Figures, similar or corresponding features are indicated by same reference numerals.
  • Fig. 1 is a diagram of an apparatus 100 in the invention.
  • Apparatus 100 comprises an antenna system 102 for at least one of receiving or transmitting an electromagnetic signal.
  • Apparatus further has circuitry 104 for at least processing or generating the signal, and coupling means 106 between antenna system 102 and circuitry 104.
  • Coupling means 106 serves to couple antenna system 102 to circuitry 104.
  • Antenna system 102 has a first antenna 108, and a second antenna 110.
  • Coupling means 106 comprises a switch 112 and a combiner 114. Switch 112 is operative to reconfigure apparatus 100 to assume a first state or a second state.
  • first antenna 108 is electrically coupled to circuitry 104 and second antenna 110 is electrically decoupled from circuitry 104.
  • first and second antennae 108 and 110 are both electrically coupled to circuitry 104.
  • Combiner 114 is operative to modify an impedance of antenna system 102 for matching with circuitry 104 in dependence on the first state or the second state.
  • Combination 114 combines the signals, received via antenna 108 and 110 when antenna system 102 is in the second state, as further explained below, by means of, e.g., a proper passive impedance transformation and balun conversion, or active impedance matching without a transformer and/or balun.
  • Circuitry 104 has a low-noise amplifier (LNA) 116, known in the art, and further signal processing circuits (not shown here).
  • Apparatus 100 comprises, e.g., a mobile telephone, or a mobile media player such as a mobile TV receiver for receipt of content information as a wireless signal from an external source, for being rendered by apparatus 100.
  • LNA low-noise amplifier
  • first antenna 106 is a fixed monopole antenna and internal to apparatus 100
  • antenna 108 is an external antenna that, when antenna system 102 has assumed the second state, forms a dipole antenna with internal monopole antenna 106.
  • circuitry 104 comprises a receiver for processing signals received via antenna system 102.
  • Switch 112 is operative to electrically connect or disconnect external antenna 110 from combiner 114.
  • Switch 112 is, e.g., a manual switch operated by the user of apparatus 100.
  • switch 112 is controlled by a sensor (not shown here) that automatically detects the presence or absence of antenna 110 if the latter is removable and can be mounted by the user into a jacket (not shown) at the housing of apparatus 100.
  • the sensor can have any design convenient for this purpose, taking into account the function and configuration of apparatus 100.
  • the sensor is operative to detect the presence or absence of antenna 110 in a galvanic, electric, magnetic, optical, or mechanical manner.
  • Fig. 2 is a diagram illustrating details of a first embodiment 200 of apparatus 100.
  • low-noise amplifier 116 is a balanced LNA.
  • a balanced amplifier is an electronic amplifier with a pair of identical signal paths connected in such a manner that the amplifier operates with the inputs in phase-opposition and with the output connections in phase, each balanced to signal-ground.
  • the advantage of employing a balanced configuration is that common-mode noises and distortions can be cancelled out at the output. The result is an amplifier with lower noise and lower distortion than with amplifiers not employing a balanced configuration.
  • the outputs of LNA 116 are coupled to a mixer 202 via a filter 204.
  • Mixer 202 supplies the mixed signal to further receiving circuitry (not shown here).
  • Combiner 114 comprises impedance matching means 206 that is operative to modify an impedance of antenna system 102 for matching with amplifier 116 under control of the state of switch 112.
  • Means 206 comprises, e.g., a balun or a transformer.
  • Figs. 3 and 4 are diagrams 300 and 400 with more details of embodiment 200 in the second state and in the first state, respectively, of apparatus 100.
  • external antenna 110 is electrically coupled to the input of balanced LNA 116 via a transformer 206 providing a balanced antenna input signal to LNA 116.
  • antenna system 102 formed by antennae 108 and 110, has assumed a dipole configuration.
  • external antenna 110 is removed from apparatus 100 and, therefore, electrically decoupled from LNA 116.
  • Switch 112 now connects the input connection for antenna 110 to signal-ground.
  • the input to LNA 116 is now unbalanced.
  • Antenna system 102 has now assumed a monopole configuration.
  • Fig. 5 is a diagram illustrating details of a second embodiment 500 of apparatus 100.
  • low-noise amplifier 116 is an unbalanced LNA.
  • Combiner 114 comprises impedance matching means 206 that is operative to modify an impedance of antenna system 102 for matching with amplifier 116 under control of the state of switch 112.
  • Means 206 comprises, e.g., a balun or a transformer.
  • Figs. 6 and 7 are diagrams 600 and 700 with more details of embodiment 200 in the second state and in the first state, respectively, of apparatus 100.
  • external antenna 110 is electrically coupled to the input of unbalanced LNA 116 via a transformer 206.
  • One coil of transformer 206 galvanically connects internal antenna 108 to the input of LNA 116, and the other coil galvanically connects external antenna 110 to signal ground.
  • the end of the other coil, no connected to antenna 110, is connected to signal- ground.
  • the signal in external antenna 110 is therefore inductively coupled to the input of LNA 116.
  • antenna system 102 formed by antennae 108 and 110, has assumed a dipole configuration.
  • switch 112 is located between external antenna 110 and combiner 114. Functionally equivalent locations for switch 112 include, e.g., between combiner 114 and LNA 116, and inside LNA 116.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

La présente invention concerne un appareil qui comporte un système d’antennes permettant de recevoir un signal électromagnétique, des circuits permettant de traiter le signal et des moyens de couplage couplant le système d’antennes aux circuits. Le système d’antennes comporte une première antenne et une seconde antenne. L’appareil peut être conçu dans un premier état ou dans un second état. Dans le premier état, la première antenne est couplée aux circuits et la seconde antenne est découplée des circuits. Dans le second état, les première et seconde antennes sont toutes les deux couplées aux circuits. Les moyens de couplage modifient l’impédance du système d’antennes sous la commande du premier état ou du second état. Du fait de ce couplage intelligent, la configuration d’antennes commute d’une façon pouvant être commandée entre une antenne unipolaire et une antenne doublet de performance supérieure, chacune utilisant le bon appariement pour une performance optimale.
PCT/IB2009/054871 2008-12-09 2009-11-03 Système d’antennes reconfigurable pour un récepteur sans fil WO2010067215A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08171068.3 2008-12-09
EP08171068 2008-12-09

Publications (1)

Publication Number Publication Date
WO2010067215A1 true WO2010067215A1 (fr) 2010-06-17

Family

ID=41467134

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/054871 WO2010067215A1 (fr) 2008-12-09 2009-11-03 Système d’antennes reconfigurable pour un récepteur sans fil

Country Status (1)

Country Link
WO (1) WO2010067215A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347560A (en) * 1999-02-08 2000-09-06 Nokia Mobile Phones Ltd Radio apparatus
WO2001020718A1 (fr) * 1999-09-10 2001-03-22 Avantego Ab Systeme d'antenne
WO2001037371A1 (fr) * 1999-11-19 2001-05-25 Allgon Ab Dispositif d'antenne et dispositif de communication comprenant ledit dispositif d'antenne
EP1202380A2 (fr) * 2000-10-27 2002-05-02 Filtronic LK Oy Antenne à double action
US7289080B1 (en) * 2006-06-28 2007-10-30 Bae Systems Information And Electronic Systems Integration Inc. Ultra broadband linear antenna

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347560A (en) * 1999-02-08 2000-09-06 Nokia Mobile Phones Ltd Radio apparatus
WO2001020718A1 (fr) * 1999-09-10 2001-03-22 Avantego Ab Systeme d'antenne
WO2001037371A1 (fr) * 1999-11-19 2001-05-25 Allgon Ab Dispositif d'antenne et dispositif de communication comprenant ledit dispositif d'antenne
EP1202380A2 (fr) * 2000-10-27 2002-05-02 Filtronic LK Oy Antenne à double action
US7289080B1 (en) * 2006-06-28 2007-10-30 Bae Systems Information And Electronic Systems Integration Inc. Ultra broadband linear antenna

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