WO2008118060A1 - Antenna selection switch - Google Patents

Antenna selection switch Download PDF

Info

Publication number
WO2008118060A1
WO2008118060A1 PCT/SE2008/000225 SE2008000225W WO2008118060A1 WO 2008118060 A1 WO2008118060 A1 WO 2008118060A1 SE 2008000225 W SE2008000225 W SE 2008000225W WO 2008118060 A1 WO2008118060 A1 WO 2008118060A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
switch
selector
connector
radio signal
Prior art date
Application number
PCT/SE2008/000225
Other languages
French (fr)
Inventor
Thomas Rutfors
Original Assignee
Proant Ab
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 Proant Ab filed Critical Proant Ab
Publication of WO2008118060A1 publication Critical patent/WO2008118060A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3833—Hand-held transceivers
    • 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
    • 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
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3877—Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Definitions

  • the present invention proposes a simple and robust solution to switch between antennas .
  • An antenna selector selects one of two or more antennas.
  • the selector contains a switch having one common terminal that electrically connects to one of two or more other terminals.
  • a two state switch is used, meaning one input can connect to one of two outputs. It can be done mechanically by a switch inside a connector. In normal case the connector switch is in a state that transfer the electrical signal between one input and one output but when an external mating connector is plugged into the connector switch it switch state and the signal transfers from the input to the external mating connector.
  • Mechanical switches for radio frequencies are mainly coaxial and it is a complex component that in general is expensive and only exists in a few shapes.
  • Switches carry out the same function but instead of using a mechanical force to switch state it switch state by a electrical signal. Also a electrical switch can perform the switch mechanically. Those switches are called MEMS. The most common switches select states by transferring the signal through transistors than either can be on or off depending witch route the signal shall transfer.
  • Embedded antennas have those properties. But the functionality of the embedded antennas depend a lot of the location. If a node containing an embedded antenna is located in such environment where the radio communication don't operate sufficient, such as basements, in a tin cabinet or other places that shields the radio signals, it is desirable that a better antenna can be connected to that an antenna can be placed at a different spot and connect by a cable to the node. To easily be able to switch between an embedded or external antenna one of abovementioned switches is needed.
  • Another option is to use an electronically controlled switch that transfers the radio signal from the embedded antenna to the external antenna.
  • Today an extra action is needed to set the switch to correct state. It can be done by a manual operation to switch state for the electronic switch. This is an extra operation that easily can be forgotten.
  • the present invention offers a robust and safe selection between antennas.
  • the switch that selects between the antennas is in a state giving connection between the radio transmitter/receiver and the terminal which is connected to an antenna, denominated antenna nr.l.
  • This antenna can be of any kind.
  • the other terminal of the switch is connected to a connector that is unconnected to any antenna and it therefore has high resistance between its terminal and ground. By a resistor to power supply, VCC, and due to high resistance to ground, this terminal will have a sufficient voltage that the switch will remain in the state that transfer the radio signal to antenna nr.l.
  • the connector If an antenna, denominated antenna nr.2, having resistance low enough between its terminal for radio signal and ground, is connected to the connector, the DC voltage will drop below the switch threshold level and the radio signal will be transferred to antenna nr.2 instead of to antenna nr.l. No extra operation to control the switch is needed and the connector to the external antenna can be of arbitrary type.
  • Common types of coaxial connectors are SMA, SMB, FME or other appropriate for the application.
  • the circuit schematic depends of the selected electrical switch and its demands and threshold voltage for switching, number of control signals, filter to not attenuate the radio signal, etc.
  • Figure 1 shows the antenna selector by prior art mechanical switch.
  • Figure 2 shows antenna selector by prior art electrical switch.
  • Figure 3 shows present invention antenna selector when antenna nr.2 isn't connected.
  • Figure 4 shows present invention antenna selector when antenna nr.2 is connected. Preferred embodiments
  • Figure 1 shows a mechanical switch (24) that change state when an external connector (14) connects.
  • Figure 2 shows a electrical switch that by manual operation (23) change state. In this case arbitrary connector can be used but a extra operation is needed to change the state of the switch.
  • Figure 3 show an example of a electrical schematic of a antenna selector according to present invention.
  • the antenna selector is included in a block (22) that can be placed on printed circuit board (PCB) .
  • PCB printed circuit board
  • the antenna nr.l doesn't need to be placed on the PCB but can also be connected by cable or connector.
  • the antenna nr.2 (11) has a connection (12) between the inner and outer conductor of its cable (13) or connector (14) in such way that the resistance between the inner and outer conductor is sufficient small that the switch (17) switch state when antenna nr.2 connects to the connector (15) and by that the radio signal (16) by the switch (17) reach the antenna nr.2 (11) that excites the signal.
  • Present invention is appropriate both when antenna nr.l is external or embedded version. It is common that the antenna nr.l is embedded to cut the cost.
  • the antenna nr.2 is embodied in such way that it can be considered as electrically short circuit.
  • F-antennas, slot antennas, PIFA, loop and some other antennas are in general electrical short circuit that is, having a negligible electrical resistance between its connection terminals.
  • These antennas can either be mounted direct on a connector (14) but are also often connected by cable (13).
  • the cable (13) and connector (14) is often of coaxial type but can also be out of other variants of cable and connectors.
  • the antenna nr.l (10) can be electrical short circuit such as F-antenna, slot antenna, PIFA or loop antenna.
  • the antenna nr.l can also consist of an electrically open antenna that is, not having electrical connection between the radio signal and its ground. Examples of open antennas are monopole and dipole antennas.
  • electrical connection means a connection a directed current (DC) can pass through.
  • DC directed current
  • the radio signal (16) has a schematic symbol that in general symbolizes a signal generator. When the system is reciprocal it is obvious that (16) also can be a receiver of radio signal and also other components used at transmitting and/or reception of radio signals.
  • the switches control signal (21) according to figure 3, have a voltage of or near the antenna selectors supply voltage, VCC, when the antenna nr.2 isn't connected. This voltage is transferred through the filter (19) to the connector (15) . In general it is necessary to add a DC-block to the switch by a capacitance (18) . It is often practice to add a resistor (20) to the VCC to reduce the current when connecting antenna nr.2
  • Figure nr 4 shows the antenna selector when antenna nr.2 (11) is connected.
  • the control signal to the switch will drop and when it is below the threshold voltage the switch (17) changes state so the radio signal from (16) passes the switch (17) and is feed to antenna nr.2 (11) instead of antenna nr.l (10).
  • the filter can be designed in different ways and figure 3 and 4 shows a filter containing three components. More and fewer components can be used. The design ought to be in such way that the DC current can pass to get correct function for the antenna selector.
  • the switch (17) is controlled by one signal only (21) .
  • Switches often require two control signals and also having them inverted in such way that if (21) having high state, that is a voltage near the VCC level, the other control signal shall have low level, that is voltage near ground level.
  • This can be embodied by adding an inverter having input (21) and output to the other control signal.
  • An inverter can be ought of a simple transistor or a logic circuit.
  • the switch in the antenna selector can consist of different types. Common switches are electrical containing transistor of different kind but also mechanical switched of MEMS or diods is common. As connector the coaxial is most common. SMA, SMB and FME are names of different coaxial connectors but the connector doesn't need to be coaxial.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Transmitters (AREA)

Abstract

The present invention offers a safe, robust and simple antenna selector. In starting position the antenna selector is in a state giving electrical connection between the radio transmitter and/or receiver and a present, often embedded antenna. When a second antenna with low resistance, often an external antenna, is connected to appropriate connector, the antenna selector changes state giving electrical connection between the radio transmitter and/or receiver and the external antenna.

Description

Technical field
The present invention proposes a simple and robust solution to switch between antennas .
State of the art and background of the invention
An antenna selector selects one of two or more antennas. The selector contains a switch having one common terminal that electrically connects to one of two or more other terminals. Mostly a two state switch is used, meaning one input can connect to one of two outputs. It can be done mechanically by a switch inside a connector. In normal case the connector switch is in a state that transfer the electrical signal between one input and one output but when an external mating connector is plugged into the connector switch it switch state and the signal transfers from the input to the external mating connector. Mechanical switches for radio frequencies are mainly coaxial and it is a complex component that in general is expensive and only exists in a few shapes.
Electrical switches carry out the same function but instead of using a mechanical force to switch state it switch state by a electrical signal. Also a electrical switch can perform the switch mechanically. Those switches are called MEMS. The most common switches select states by transferring the signal through transistors than either can be on or off depending witch route the signal shall transfer.
To have small and cheap antennas in the different nodes in a wireless communication system is a common desire both in the planning and set-up phase. Embedded antennas have those properties. But the functionality of the embedded antennas depend a lot of the location. If a node containing an embedded antenna is located in such environment where the radio communication don't operate sufficient, such as basements, in a tin cabinet or other places that shields the radio signals, it is desirable that a better antenna can be connected to that an antenna can be placed at a different spot and connect by a cable to the node. To easily be able to switch between an embedded or external antenna one of abovementioned switches is needed.
Today the mechanical switches integrated in a coaxial connector where the signal is transferred to the external antenna is most common. These connectors are very expensive and exist primarily to small and brittle connectors that aren't appropriate in applications such as industrial.
Another option is to use an electronically controlled switch that transfers the radio signal from the embedded antenna to the external antenna. Today an extra action is needed to set the switch to correct state. It can be done by a manual operation to switch state for the electronic switch. This is an extra operation that easily can be forgotten.
Therefore it is desirable with a cheap but more secure and robust system to select between an embedded and external antenna .
Description of the invention
The present invention offers a robust and safe selection between antennas. In the starting position, the switch that selects between the antennas is in a state giving connection between the radio transmitter/receiver and the terminal which is connected to an antenna, denominated antenna nr.l. This antenna can be of any kind. The other terminal of the switch is connected to a connector that is unconnected to any antenna and it therefore has high resistance between its terminal and ground. By a resistor to power supply, VCC, and due to high resistance to ground, this terminal will have a sufficient voltage that the switch will remain in the state that transfer the radio signal to antenna nr.l. If an antenna, denominated antenna nr.2, having resistance low enough between its terminal for radio signal and ground, is connected to the connector, the DC voltage will drop below the switch threshold level and the radio signal will be transferred to antenna nr.2 instead of to antenna nr.l. No extra operation to control the switch is needed and the connector to the external antenna can be of arbitrary type. Common types of coaxial connectors are SMA, SMB, FME or other appropriate for the application.
The circuit schematic depends of the selected electrical switch and its demands and threshold voltage for switching, number of control signals, filter to not attenuate the radio signal, etc.
Description of drawings
Figure 1: shows the antenna selector by prior art mechanical switch.
Figure 2: shows antenna selector by prior art electrical switch.
Figure 3: shows present invention antenna selector when antenna nr.2 isn't connected.
Figure 4: shows present invention antenna selector when antenna nr.2 is connected. Preferred embodiments
Figure 1 shows a mechanical switch (24) that change state when an external connector (14) connects. Figure 2 shows a electrical switch that by manual operation (23) change state. In this case arbitrary connector can be used but a extra operation is needed to change the state of the switch.
Figure 3 show an example of a electrical schematic of a antenna selector according to present invention. According to figure 3 the antenna selector is included in a block (22) that can be placed on printed circuit board (PCB) . According to figure 3 is the antenna nr.l (10) inserted in the block and can consist of an antenna mounted on or inserted in the PCB. The antenna nr.l doesn't need to be placed on the PCB but can also be connected by cable or connector. The antenna nr.2 (11) has a connection (12) between the inner and outer conductor of its cable (13) or connector (14) in such way that the resistance between the inner and outer conductor is sufficient small that the switch (17) switch state when antenna nr.2 connects to the connector (15) and by that the radio signal (16) by the switch (17) reach the antenna nr.2 (11) that excites the signal.
Present invention is appropriate both when antenna nr.l is external or embedded version. It is common that the antenna nr.l is embedded to cut the cost.
Ofetn the antenna nr.2 is embodied in such way that it can be considered as electrically short circuit. F-antennas, slot antennas, PIFA, loop and some other antennas are in general electrical short circuit that is, having a negligible electrical resistance between its connection terminals. These antennas can either be mounted direct on a connector (14) but are also often connected by cable (13). The cable (13) and connector (14) is often of coaxial type but can also be out of other variants of cable and connectors.
The antenna nr.l (10) can be electrical short circuit such as F-antenna, slot antenna, PIFA or loop antenna. The antenna nr.l can also consist of an electrically open antenna that is, not having electrical connection between the radio signal and its ground. Examples of open antennas are monopole and dipole antennas. By electrical connection means a connection a directed current (DC) can pass through.
The radio signal (16) has a schematic symbol that in general symbolizes a signal generator. When the system is reciprocal it is obvious that (16) also can be a receiver of radio signal and also other components used at transmitting and/or reception of radio signals.
To switch state of the switch (17) more components are needed to get desirable functionality and performance. The switches control signal (21) according to figure 3, have a voltage of or near the antenna selectors supply voltage, VCC, when the antenna nr.2 isn't connected. This voltage is transferred through the filter (19) to the connector (15) . In general it is necessary to add a DC-block to the switch by a capacitance (18) . It is often practice to add a resistor (20) to the VCC to reduce the current when connecting antenna nr.2
Figure nr 4 shows the antenna selector when antenna nr.2 (11) is connected. By the connection the control signal to the switch will drop and when it is below the threshold voltage the switch (17) changes state so the radio signal from (16) passes the switch (17) and is feed to antenna nr.2 (11) instead of antenna nr.l (10).
To reduce the losses of the radio signal it is good engineering practice to add a filter (19) so the radio signal is blocked from the resistance (20) and control signal (21) . The filter can be designed in different ways and figure 3 and 4 shows a filter containing three components. More and fewer components can be used. The design ought to be in such way that the DC current can pass to get correct function for the antenna selector.
In figure 3 and 4 the switch (17) is controlled by one signal only (21) . Switches often require two control signals and also having them inverted in such way that if (21) having high state, that is a voltage near the VCC level, the other control signal shall have low level, that is voltage near ground level. This can be embodied by adding an inverter having input (21) and output to the other control signal. An inverter can be ought of a simple transistor or a logic circuit.
A person skilled in the art realizes that same properties can be achieved by changing the electrical schematic of figure 3 and 4.
The switch in the antenna selector can consist of different types. Common switches are electrical containing transistor of different kind but also mechanical switched of MEMS or diods is common. As connector the coaxial is most common. SMA, SMB and FME are names of different coaxial connectors but the connector doesn't need to be coaxial.

Claims

Claims
1) Antenna selector containing a switch that transfer a radio signal either to antenna nr.l, that normally is connected to the switch, or to antenna nr.2, that is connected when the radio signal shall be transferred to antenna nr.2, characterised in that the antenna nr.2 has a resistance sufficient low to achieve a sufficient voltage change of the switch control signal that it changes state and transfer the radio signal to antenna nr.2 when connected, instead of to antenna nr.l
2) Antenna selector according to claim 1 characterised in that the antenna nr.l is an embedded antenna.
3) Antenna selectoraccording to any of claims 1-2 characterised in that antenna nr.2 is an external located antenna .
4) Antenna selector according to any of claims 1-3 characterised in that the antennanr.2 is electrically short circuit.
5) Antenna selector according to any of claims 1-4 characterised in that antenna nr.l is electrically short circuit .
6) Antenna selector according to any of claims 1-4 characterised in that antenna nr.l is electrically open circuit .
PCT/SE2008/000225 2007-03-27 2008-03-27 Antenna selection switch WO2008118060A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700773-5 2007-03-27
SE0700773A SE0700773L (en) 2007-03-27 2007-03-27 Antenna selector

Publications (1)

Publication Number Publication Date
WO2008118060A1 true WO2008118060A1 (en) 2008-10-02

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ID=39409830

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/000225 WO2008118060A1 (en) 2007-03-27 2008-03-27 Antenna selection switch

Country Status (2)

Country Link
SE (1) SE0700773L (en)
WO (1) WO2008118060A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105375101A (en) * 2015-11-28 2016-03-02 广东欧珀移动通信有限公司 Antenna device of mobile terminal and mobile terminal
CN109417220A (en) * 2016-07-27 2019-03-01 英特尔公司 The wearable electronic supported with detachable type antenna
WO2020122399A1 (en) * 2018-12-11 2020-06-18 Samsung Electronics Co., Ltd. Electronic device of performing wireless communication by multiple schemes and method of controlling same
FR3114162A1 (en) * 2020-09-17 2022-03-18 Delta Dore METHOD AND DEVICE FOR DETECTING THE PRESENCE OF AN EXTERNAL ANTENNA AND FOR CONNECTING THE EXTERNAL ANTENNA TO A RADIO MODULE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101620265B (en) * 2008-07-01 2012-10-03 希姆通信息技术（上海）有限公司 Switching circuit and switching method for built-in antenna and external antenna of GPS

Citations (7)

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Publication number Priority date Publication date Assignee Title
US4661992A (en) * 1985-07-31 1987-04-28 Motorola Inc. Switchless external antenna connector for portable radios
US5801661A (en) * 1994-12-19 1998-09-01 Mitsubishi Denki Kabushiki Kaisha Antenna switching circuit suitable for a radio-frequency apparatus with a built-in antenna
US5898908A (en) * 1996-10-09 1999-04-27 Ericsson, Inc. RF gain enhancement for cellular telephone
US6115585A (en) * 1996-08-07 2000-09-05 Nokia Mobile Phones Limited Antenna switching circuits for radio telephones
WO2002058282A1 (en) * 2001-01-22 2002-07-25 Blue2Space Ab Radio communication system comprising an internal and an external antenna part connected via a digital signal transmitting cable
US20040225786A1 (en) * 2000-06-30 2004-11-11 Marko Puupponen Switching and connecting arrangement for coupling external and internal antennas for example with an expansion card
US20040252073A1 (en) * 2003-03-28 2004-12-16 Hiroaki Kukita Connector Unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661992A (en) * 1985-07-31 1987-04-28 Motorola Inc. Switchless external antenna connector for portable radios
US5801661A (en) * 1994-12-19 1998-09-01 Mitsubishi Denki Kabushiki Kaisha Antenna switching circuit suitable for a radio-frequency apparatus with a built-in antenna
US6115585A (en) * 1996-08-07 2000-09-05 Nokia Mobile Phones Limited Antenna switching circuits for radio telephones
US5898908A (en) * 1996-10-09 1999-04-27 Ericsson, Inc. RF gain enhancement for cellular telephone
US20040225786A1 (en) * 2000-06-30 2004-11-11 Marko Puupponen Switching and connecting arrangement for coupling external and internal antennas for example with an expansion card
WO2002058282A1 (en) * 2001-01-22 2002-07-25 Blue2Space Ab Radio communication system comprising an internal and an external antenna part connected via a digital signal transmitting cable
US20040252073A1 (en) * 2003-03-28 2004-12-16 Hiroaki Kukita Connector Unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105375101A (en) * 2015-11-28 2016-03-02 广东欧珀移动通信有限公司 Antenna device of mobile terminal and mobile terminal
CN105375101B (en) * 2015-11-28 2018-06-29 广东欧珀移动通信有限公司 The antenna assembly and mobile terminal of a kind of mobile terminal
CN109417220A (en) * 2016-07-27 2019-03-01 英特尔公司 The wearable electronic supported with detachable type antenna
CN109417220B (en) * 2016-07-27 2021-03-12 英特尔公司 Wearable electronic device with detachable antenna support
WO2020122399A1 (en) * 2018-12-11 2020-06-18 Samsung Electronics Co., Ltd. Electronic device of performing wireless communication by multiple schemes and method of controlling same
KR20200071494A (en) * 2018-12-11 2020-06-19 삼성전자주식회사 Electronic device performing wireless communication of plurality of communication schemes and method of controlling the same
KR102568548B1 (en) * 2018-12-11 2023-08-21 삼성전자주식회사 Electronic device performing wireless communication of plurality of communication schemes and method of controlling the same
FR3114162A1 (en) * 2020-09-17 2022-03-18 Delta Dore METHOD AND DEVICE FOR DETECTING THE PRESENCE OF AN EXTERNAL ANTENNA AND FOR CONNECTING THE EXTERNAL ANTENNA TO A RADIO MODULE
EP3971597A1 (en) * 2020-09-17 2022-03-23 Delta Dore Method and device for detecting the presence of an external antenna and connection of the external antenna to a radio module

Also Published As

Publication number Publication date
SE530406C2 (en) 2008-05-27
SE0700773L (en) 2008-05-27

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