WO2004100304A1 - Commuteur de radio frequence et de donnees - Google Patents

Commuteur de radio frequence et de donnees Download PDF

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Publication number
WO2004100304A1
WO2004100304A1 PCT/GB2004/001932 GB2004001932W WO2004100304A1 WO 2004100304 A1 WO2004100304 A1 WO 2004100304A1 GB 2004001932 W GB2004001932 W GB 2004001932W WO 2004100304 A1 WO2004100304 A1 WO 2004100304A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
path
command
port
ghz
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.)
Ceased
Application number
PCT/GB2004/001932
Other languages
English (en)
Inventor
Paul Wallis
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.)
Individual
Original Assignee
Individual
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 GB0310304A external-priority patent/GB0310304D0/en
Application filed by Individual filed Critical Individual
Publication of WO2004100304A1 publication Critical patent/WO2004100304A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/10—Auxiliary devices for switching or interrupting
    • H01P1/15—Auxiliary devices for switching or interrupting by semiconductor devices

Definitions

  • Radio frequency and data switch are Radio frequency and data switch.
  • This switch will be capable of taking data from a theoretically unlimited number of different locations and re-routing this data to a single decoder.
  • the switch will be able to route both Radio Frequency and data information.
  • Switch must be capable of interrogation and report back its current state (switch position and serviceability).
  • the RF path shall be a duplex path via the switch.
  • the RF path shall be capable of handling at least 25 W constant carrier.
  • the switch will enable multiple remote systems of like design to be controlled and monitored by any a single source device and processor.
  • a solid state Duplex RF switch Capable of passing a RF Carrier (Modulated) from a single source to any one (by selection) of a number, theoretically unlimited, switched ports.
  • the switched port is selected by a data link which is distinctly isolated from the RF path and is of the form of a command and telemetry link to a processing device which will run a program of events to select the desired Duplex RF Port.
  • the switched port appears Transparent to the RF Path.
  • the command and telemetry aspect is always transparent to the operation of the RF Path.
  • the command and telemetry aspect of the switch is based on solid state circuitry that is readily available and of standard functionality.
  • the unit therefore appears as two distinct functions, which are interactive, one dependant on the other but isolated from its function by design.
  • RF coaxial feeds through switch to and from other RF devices are interactive, one dependant on the other but isolated from its function by design.
  • Coax RF input / output with a UNITY gain duplex amplifier Communicating RF information to and from the selected port in 2.
  • Power from 5 regulates the current fed to 1 powering the RF device.
  • Switch command, control and telemetry logic Taking software instructions selecting port position in 2 to be activated from the processor via the communications chip 4. Powered from 5
  • the RF path shall be a duplex path via the switch.
  • the RF path shall be capable of handling at least 25 W constant carrier.
  • Design Criteria There are many systems, which utilise RF services modulated with data to command, control and monitor remote systems.
  • the switch will enable multiple remote systems of like design to be controlled and monitored by any a single source device and or processor
  • the communications is based on a standard integrated circuit, which will provide duplex command, control and telemetry of the switch
  • Switch is capable of interrogation and will report back its current state (switch position and serviceability).
  • the component described in this document is a novel representation of a high performance dual frequency multi-way switch with high reliability, which is suitable for practical implementation where it is desired to switch between a large number of output ports and maintain high isolation and good input and output match.
  • the switch is required to route an input RF or data signal to one of a number of outputs and operate over a narrow bandwidth at 13.96 MHz and 2.4 GHz.
  • a requirement can, in principle, be met by having a number of series switching devices connected to a common feed point. While this approach is adequate for operation at 10s of MHz, the associated 'off state capacitance of any practical switching device seriously degrades the input and output match and the isolation of the switch at 100s of MHz and above, e.g. 2.4 GHz.
  • the approach to overcome this limitation at 2.4 GHz will be discussed in the following paragraphs.
  • a transmission line technique to improve the input and output match at 2.4 GHz is used. This approach 'tunes out' the effect of the 'off state capacitance by using an approximate ⁇ /2 line between the common feed point and each individual switch circuit.
  • the approximate ⁇ 2 line transforms the switch impedance in the 'off state to a high impedance at the common feed point approximating an open circuit. This reduces the impedance loading at this point from the switches in the 'off state and largely removes the adverse effect on the input and output match.
  • each ⁇ /2 line means that it is only possible to achieve a good match over a limited bandwidth at 2.4 GHz.
  • the effect of these transmission lines is to provide an approximate capacitive loading and degrade the input and output match by a small amount, which progressively degrades with the number of switch outputs.
  • electromechanical e.g. miniature electromechanical and reed switches
  • solid state e.g. PIN diodes
  • FET/HEMT type switches Two basic types of switching device were considered: a) electromechanical, e.g. miniature electromechanical and reed switches and b) solid state, e.g. PIN diodes and d) FET/HEMT type switches.
  • This Figure shows the input (S ⁇ ) and output (S 22 ) matches together with the insertion loss (S 21 ) and isolation (S 31 ) of an optimised 8-way switch realised using ideal transmission lines. In practice, there will be a small amount of loss in the transmission lines and the connectors. The following paragraph describes the key features of the RF performance.
  • the bandwidth will be relatively narrow and determined y the impedance of the line (50 ohms in this case) and the number of switch outputs, which are 'off (seven for an 8-way switch). Therefore, the match at 2.4 GHz is primarily determined by the transmission behaviour of these ⁇ /2 lines. Mainly the series resistance of the switching device then determines the insertion loss to the required output port at 2.4 GHz.
  • the ⁇ /2 line will simulate a short circuit at the common point at 1.2 GHz ensuring no transmission occurs at this frequency and then progressively less capacitive loading down to DC.
  • the input and output match is primarily determined by the residual capacitance from these ⁇ /2 lines. Also the series resistance of the switch as before largely determines the insertion loss.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)

Abstract

L'invention concerne un commutateur RF duplex à l'état solide apte à faire passer une porteuse RF (modulée) d'une simple source à un quelconque port commuté théoriquement illimité (par sélection). Le port commuté est sélectionné par une liaison de données isolée distinctement du trajet RF et se présente sous forme d'une commande et d'une liaison télémétrique vers un dispositif de traitement qui va exécuter un programme d'événements afin de sélectionner le port RF duplex souhaité. Une fois sélectionné, le port commuté apparaît transparent au trajet RF. La commande et l'aspect télémétrique sont également transparents à l'opération du trajet RF. Le commutateur fonctionne sur une largeur de bande RF large.
PCT/GB2004/001932 2003-05-06 2004-05-05 Commuteur de radio frequence et de donnees Ceased WO2004100304A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0310304.1 2003-05-06
GB0310304A GB0310304D0 (en) 2003-05-06 2003-05-06 Multiple device
GB0314381.5 2003-06-20
GB0314381A GB0314381D0 (en) 2003-05-06 2003-06-20 Multiple devices

Publications (1)

Publication Number Publication Date
WO2004100304A1 true WO2004100304A1 (fr) 2004-11-18

Family

ID=33436272

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/001932 Ceased WO2004100304A1 (fr) 2003-05-06 2004-05-05 Commuteur de radio frequence et de donnees

Country Status (1)

Country Link
WO (1) WO2004100304A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5521562A (en) * 1991-06-14 1996-05-28 Cambridge Computer Limited High isolation switch
EP0849820A2 (fr) * 1996-12-21 1998-06-24 HE HOLDINGS, INC. dba HUGHES ELECTRONICS Réseau à micro-ondes accordable avec des commutateurs microélectromécaniques
US6111475A (en) * 1997-03-05 2000-08-29 The Commonwealth Of Australia Commonwealth Scientific And Industrial Research Organization High frequency multi-port switching circuit
US20020118076A1 (en) * 2000-01-12 2002-08-29 Sharpe Thomas M High Power Pin Diode Switch
EP1289159A2 (fr) * 2001-09-03 2003-03-05 Matsushita Electric Industrial Co., Ltd. Dispositif à circuit haute fréquence et dispositif mobile de communication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5521562A (en) * 1991-06-14 1996-05-28 Cambridge Computer Limited High isolation switch
EP0849820A2 (fr) * 1996-12-21 1998-06-24 HE HOLDINGS, INC. dba HUGHES ELECTRONICS Réseau à micro-ondes accordable avec des commutateurs microélectromécaniques
US6111475A (en) * 1997-03-05 2000-08-29 The Commonwealth Of Australia Commonwealth Scientific And Industrial Research Organization High frequency multi-port switching circuit
US20020118076A1 (en) * 2000-01-12 2002-08-29 Sharpe Thomas M High Power Pin Diode Switch
EP1289159A2 (fr) * 2001-09-03 2003-03-05 Matsushita Electric Industrial Co., Ltd. Dispositif à circuit haute fréquence et dispositif mobile de communication

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