WO1995013668A1 - Electronic antenna switching system - Google Patents

Electronic antenna switching system Download PDF

Info

Publication number
WO1995013668A1
WO1995013668A1 PCT/US1994/010950 US9410950W WO9513668A1 WO 1995013668 A1 WO1995013668 A1 WO 1995013668A1 US 9410950 W US9410950 W US 9410950W WO 9513668 A1 WO9513668 A1 WO 9513668A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
coupled
switching system
electronic
switch
Prior art date
Application number
PCT/US1994/010950
Other languages
French (fr)
Inventor
Mark Pennock
Glenn C. Goergen
Mike M. Albert
Original Assignee
Motorola Inc.
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 Motorola Inc. filed Critical Motorola Inc.
Priority to AU79208/94A priority Critical patent/AU7920894A/en
Publication of WO1995013668A1 publication Critical patent/WO1995013668A1/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
    • 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
    • H04B1/40—Circuits
    • 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

  • this invention relates to radio frequency (RF) antennas, and more specifically to an electronic antenna switching system which switches between two or more RF antennas.
  • RF radio frequency
  • Radio systems such as cellular radiotelephone systems
  • Portable radiotelephones often contain an internal antenna and an antenna connector for connecting an external antenna to the portable radiotelephone.
  • the external antenna would provide a superior transmission path between the portable radiotelephone and a remote transceiver.
  • the radiotelephone would switch the RF path from the internal antenna to the external antenna.
  • radiotelephone manufacturers have provided the internal antenna and the external antenna connector as previously discussed.
  • One such antenna switching system provided a whip antenna extending from the top of the portable radiotelephone and the external antenna connector protruding from the bottom of the portable radiotelephone. The insertion of the external antenna into the external antenna connector activated a mechanical switch. The mechanical switch physically decoupled the whip antenna from the RF signal path and coupled the external antenna into the RF signal path.
  • FIG. 1 is an illustration in block diagram form of a radiotelephone system including a radiotelephone in accordance with the present invention.
  • FIG. 2 is a detailed illustration of an electronic antenna switching system in accordance with the present invention.
  • FIG. 3 is a detailed illustration of an alternative electronic antenna switching system in accordance with the present invention.
  • FIG. 4 is a detailed illustration of an alternative electronic antenna switching system in accordance with the present invention.
  • FIG. 1 is an illustration in block diagram form of a radiotelephone system 100.
  • the radiotelephone system 100 includes a remote transceiver 101 which sends and receives RF signals to and from a plurality of radiotelephones contained within a fixed geographic area.
  • the radiotelephone 103 is one such radiotelephone served by the remote transceiver 101.
  • the radiotelephone 103 includes a first antenna 105 and a second antenna 107.
  • the second antenna 107 is detachably coupled to the radiotelephone 103 through an external antenna connector 109.
  • the second antenna 107 is coupled to the external antenna connector 109 through a coil cord connector 111. Any other equally sufficient means of connecting the antenna 107 to the portable radiotelephone 103 may be used such as an vehicular radiotelephone adapter.
  • radiotelephone 103 contains an antenna detector circuit 113 and a switch 115.
  • the antenna detector circuit 113 is coupled to the second antenna's transmission line 117.
  • the antenna detector circuit 113 Upon insertion of the coil cord connector 111 of the second antenna 107 into the external antenna connector 109, the antenna detector circuit 113 generates a switching signal 119 indicating the presence of the second antenna 107 in the radiotelephone 103.
  • the switch 115 has two inputs, namely, the first antenna's transmission line 121 and the second antenna's transmission line 117. When only the first antenna is present in the radiotelephone, the switch 115 provides a connection between the first antenna's transmission line 121 and a transmission line output 123 of the switch 115.
  • the switch responsive to a switching signal 119 couples the second antenna's transmission line 117 to the transmission line output 123.
  • the switch 115 is physically located near the top of the radiotelephone 103, providing a short transmission line 121 for the first antenna 105.
  • the short transmission line 121 reduces the potential signal loss along the transmission line 121.
  • the first antenna 105 and the second antenna 107 provide both transmission and reception of RF signals.
  • the external antenna 107 could be used solely for reception of RF signals or solely for transmission of RF signals.
  • the duplexer 125 allows the transmitter and the receiver to share a single antenna.
  • the radiotelephone 103 includes a receiver 127, a transmitter 129, a processor 131 and a user interface 133. While receiving signals from the remote transceiver 101, the radiotelephone 103 uses the first antenna 105 or the second antenna 107 to couple the RF signal and convert the RF signal into an electrical RF signal. The electrical RF signal is received by the radio receiver 127, for use within the radiotelephone 103. The receiver 127 generates a symbol signal for use by the processor 131. The processor 131 formats the symbol signal into voice or data for the user interface 133.
  • the user interface 133 typically contains a microphone, a speaker and a keypad and a display.
  • FIG. 2 is a detailed illustration of the electronic antenna switching system employed in the radiotelephone 103.
  • the second antenna 107 is coupled to the external antenna connector 109 using a 50 ohm coax 201 and the coil cord connector 111.
  • the 50 ohm coax 201 contains an outer conductor 203, a center conductor 205 and a dielectric, which is not shown between the outer conductor 203 and the center conductor 205.
  • the center conductor is coupled through a resistor 209 to an electrical ground 211.
  • the resistor 209 is a 10 kilo-ohm (K ⁇ ) resistor.
  • K ⁇ 10 kilo-ohm
  • an inductor could be substituted for the resistor 209.
  • a DC blocking capacitor 207 is coupled between a break in the center conductor 205. In the preferred embodiment, the DC blocking capacitor has a value of 33 picofarads(pF).
  • the center conductor 205 When the coil cord connector 111 of the second antenna 107 is inserted into the external antenna connector 109, the center conductor 205 is coupled to the 50 ohm transmission line 117. An additional DC blocking capacitor 213 is provided between the switch 115 and the transmission line 117 to eliminate any DC energy being coupled into the RF switch 115.
  • the center conductor 205 or DC path is then routed through a second high impedance resistor 215 and a filtering capacitor 217 before coupling into the electronic antenna detector circuit 113.
  • the high impedance resistor 215 has a value of 10 K ⁇ and the filtering capacitor 217 has a value of 33 pF.
  • the DC path turns on both transistors in the antenna detector circuit 113, causing the the voltages VI and V2 to change as described below.
  • the voltage VI indicated in FIG. 2 is at a negative 9 volts and the voltage V2 as indicated in FIG. 2 is at 0 volts. This couples the transmission line 117 to the transmission line output 123 through the RF switch 115.
  • the voltage VI is at 0 volts and the voltage V2 is at -9 volts.
  • This configuration couples the first antenna transmission path 121 to the transmission path 123 output from the RF switch 115.
  • FIG. 3 is a detailed description of an alternative embodiment of the electronic antenna switching system.
  • the switch 115 and the antenna detector circuit 113 of FIG. 1 are combined into a smart switch 305 which detects the presence of the second antenna 107 and couples the second antenna's transmission line 117 to the duplexer when the second antenna 107 is present.
  • the center conductor 205 of the coax 201 is coupled to a voltage generator 301 via a low impedance resistor 303.
  • the voltage generator 301 generates 6 volts DC onto the center conductor 205.
  • the low impedance resistor 303 has a value of 300 ohms in the preferred embodiment.
  • the smart switch 305 contains a quarter wavelength transmission line 307 and to a first diode 309 and a second diode 311.
  • the 6 volts on the center conductor biases the first diode 309 and the second diode 311, turning the diodes 309, 311 on.
  • the quarter wavelength transmission line 307 looks like an open circuit to the second antenna's transmission line 117, thus, the second antenna's transmission line 117 is effectively coupled to the duplexer 125.
  • the first and second diodes 309, 311 are no longer biased by the voltage provided in the center conductor 205.
  • the first antenna 105 is directly coupled to the duplexer 125 via the transmission line 307.
  • FIG. 4 is a detailed illustration of an alternative electronic switching system.
  • the coil cord connector 111 contains the exact circuitry of that discussed in FIG. 1 and uses the smart switch 305 of FIG. 3. Unlike FIG. 3, the coil cord connector 111 couples the center conductor 205 to an electrical ground.
  • a bias circuit 401 is coupled to the second antenna's transmission line 117 to provide the proper bias for the diodes contained within the smart switch 305.
  • the center conductor Upon insertion of the coil cord connector 111 of the second antenna 107 into the external antenna connector 109, the center conductor is coupled to the transmission line 117.
  • the transmission line 117 provides a DC path to ground for the antenna detector circuit 401.
  • the transistor in the antenna detector circuit 401 generates a bias current for the diodes in the smart switch 305.
  • the quarter wavelength transmission line 507 looks like an open circuit to the second antenna's transmission line 117 thus providing a direct RF connection to the duplexer 125 through the switch 501.
  • the second antenna 107 is not present, the first and second FET transistors 503, 505 are no longer turned on thus they look like open circuits to the first antenna 105. Thus, providing a direct connection between the first antenna 105 and the duplexer 125.

Landscapes

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

Abstract

An electronic antenna switching system switches between an internal and an external antenna (105, 107) on a portable radiotelephone (103). Here, the external antenna (107) contains a coil cord connector (111). In the coil cord connector (111) an electrical ground or a predetermined voltage is applied to a center conductor (205) of a coax cable (201). Internal to the radiotelephone (103), an antenna detector circuit (113) detects when the second antenna (107) is attached to the electronic antenna switching system and generates a control signal (119) in response thereto. A switch (115) switches the active transmission path between the internal and the external antenna's transmission path in response to the control signal (119).

Description

ELECTRONIC ANTENNA SWITCHING SYSTEM
Field of the Invention
Generally, this invention relates to radio frequency (RF) antennas, and more specifically to an electronic antenna switching system which switches between two or more RF antennas.
Background of the Invention
In radio systems, such as cellular radiotelephone systems, it is often advantageous to provide the radiotelephone with more than one antenna. Portable radiotelephones often contain an internal antenna and an antenna connector for connecting an external antenna to the portable radiotelephone. In these circumstances, it is assumed that the external antenna would provide a superior transmission path between the portable radiotelephone and a remote transceiver. Thus, when an external antenna is connected to the antenna connector, the radiotelephone would switch the RF path from the internal antenna to the external antenna.
In the past, radiotelephone manufacturers have provided the internal antenna and the external antenna connector as previously discussed. One such antenna switching system provided a whip antenna extending from the top of the portable radiotelephone and the external antenna connector protruding from the bottom of the portable radiotelephone. The insertion of the external antenna into the external antenna connector activated a mechanical switch. The mechanical switch physically decoupled the whip antenna from the RF signal path and coupled the external antenna into the RF signal path.
In order to provide a mechanical switch at or near the bottom of the portable radiotelephone which carried the RF signal path from the whip antenna, a transmission line was run from the top to the bottom of the portable radiotelephone and back, causing significant signal loss on the RF signal path. Additionally, a mechanical switch activated by an external antenna causes reliability problems from the repeated uses and the corrosion caused from inserting an external antenna into a mechanical switch. Thus, it would be advantageous to provide an electronic antenna switching system which is reliable and reduces the RF signal loss within the portable radiotelephone.
Brief Description of the Drawings
FIG. 1 is an illustration in block diagram form of a radiotelephone system including a radiotelephone in accordance with the present invention.
FIG. 2 is a detailed illustration of an electronic antenna switching system in accordance with the present invention.
FIG. 3 is a detailed illustration of an alternative electronic antenna switching system in accordance with the present invention.
FIG. 4 is a detailed illustration of an alternative electronic antenna switching system in accordance with the present invention.
FIG. 5 is a detailed illustration of an alternative electronic antenna switching system in accordance with the present invention.
Description of a Preferred Embodiment
FIG. 1 is an illustration in block diagram form of a radiotelephone system 100. The radiotelephone system 100 includes a remote transceiver 101 which sends and receives RF signals to and from a plurality of radiotelephones contained within a fixed geographic area. The radiotelephone 103 is one such radiotelephone served by the remote transceiver 101. The radiotelephone 103 includes a first antenna 105 and a second antenna 107. The second antenna 107 is detachably coupled to the radiotelephone 103 through an external antenna connector 109. In the preferred embodiment, the second antenna 107 is coupled to the external antenna connector 109 through a coil cord connector 111. Any other equally sufficient means of connecting the antenna 107 to the portable radiotelephone 103 may be used such as an vehicular radiotelephone adapter.
Additionally, radiotelephone 103 contains an antenna detector circuit 113 and a switch 115. The antenna detector circuit 113 is coupled to the second antenna's transmission line 117. Upon insertion of the coil cord connector 111 of the second antenna 107 into the external antenna connector 109, the antenna detector circuit 113 generates a switching signal 119 indicating the presence of the second antenna 107 in the radiotelephone 103. The switch 115 has two inputs, namely, the first antenna's transmission line 121 and the second antenna's transmission line 117. When only the first antenna is present in the radiotelephone, the switch 115 provides a connection between the first antenna's transmission line 121 and a transmission line output 123 of the switch 115. When the second antenna 107 is inserted into the portable radiotelephone 103, the switch responsive to a switching signal 119 couples the second antenna's transmission line 117 to the transmission line output 123. In the preferred embodiment, the switch 115 is physically located near the top of the radiotelephone 103, providing a short transmission line 121 for the first antenna 105. The short transmission line 121 reduces the potential signal loss along the transmission line 121. By placing the switch close to the top of the portable radiotelephone 103 avoids running transmission line 121 all the way down across the radio to the bottom of the radiotelephone and back up as discussed in the background of the invention.
In the preferred embodiment, the first antenna 105 and the second antenna 107 provide both transmission and reception of RF signals. Alternatively, the external antenna 107 could be used solely for reception of RF signals or solely for transmission of RF signals.
The duplexer 125 allows the transmitter and the receiver to share a single antenna. Additionally, the radiotelephone 103 includes a receiver 127, a transmitter 129, a processor 131 and a user interface 133. While receiving signals from the remote transceiver 101, the radiotelephone 103 uses the first antenna 105 or the second antenna 107 to couple the RF signal and convert the RF signal into an electrical RF signal. The electrical RF signal is received by the radio receiver 127, for use within the radiotelephone 103. The receiver 127 generates a symbol signal for use by the processor 131. The processor 131 formats the symbol signal into voice or data for the user interface 133. The user interface 133 typically contains a microphone, a speaker and a keypad and a display. Upon the transmission of RF signals from the portable radiotelephone 103 to the remote transceiver 101, the voice and/or data signals from the user interface 133 are processed by the processor 131. The processed signals are input into the transmitter 129. The transmitter 129 converts the data into electrical RF signals. The electrical RF signals are converted into RF signals and output by one of the antennas 105, 107. The RF signals are received by the remote transceiver 101.
FIG. 2 is a detailed illustration of the electronic antenna switching system employed in the radiotelephone 103. Here, the second antenna 107 is coupled to the external antenna connector 109 using a 50 ohm coax 201 and the coil cord connector 111. The 50 ohm coax 201 contains an outer conductor 203, a center conductor 205 and a dielectric, which is not shown between the outer conductor 203 and the center conductor 205. In the coil cord connector 111, the center conductor is coupled through a resistor 209 to an electrical ground 211. In the preferred embodiment, the resistor 209 is a 10 kilo-ohm (KΩ) resistor. Alternatively, an inductor could be substituted for the resistor 209. Additionally, a DC blocking capacitor 207 is coupled between a break in the center conductor 205. In the preferred embodiment, the DC blocking capacitor has a value of 33 picofarads(pF).
When the coil cord connector 111 of the second antenna 107 is inserted into the external antenna connector 109, the center conductor 205 is coupled to the 50 ohm transmission line 117. An additional DC blocking capacitor 213 is provided between the switch 115 and the transmission line 117 to eliminate any DC energy being coupled into the RF switch 115. The center conductor 205 or DC path is then routed through a second high impedance resistor 215 and a filtering capacitor 217 before coupling into the electronic antenna detector circuit 113. In the preferred embodiment, the high impedance resistor 215 has a value of 10 KΩ and the filtering capacitor 217 has a value of 33 pF. The DC path turns on both transistors in the antenna detector circuit 113, causing the the voltages VI and V2 to change as described below.
When the coil cord connector 111 of the external antenna 107 is connected to the external antenna connector 109, the voltage VI indicated in FIG. 2 is at a negative 9 volts and the voltage V2 as indicated in FIG. 2 is at 0 volts. This couples the transmission line 117 to the transmission line output 123 through the RF switch 115. When the second antenna 107 is removed from the external antenna connector 109, the voltage VI is at 0 volts and the voltage V2 is at -9 volts. This configuration couples the first antenna transmission path 121 to the transmission path 123 output from the RF switch 115.
FIG. 3 is a detailed description of an alternative embodiment of the electronic antenna switching system. Here, the switch 115 and the antenna detector circuit 113 of FIG. 1 are combined into a smart switch 305 which detects the presence of the second antenna 107 and couples the second antenna's transmission line 117 to the duplexer when the second antenna 107 is present. Here, the center conductor 205 of the coax 201 is coupled to a voltage generator 301 via a low impedance resistor 303. In the preferred embodiment, the voltage generator 301 generates 6 volts DC onto the center conductor 205. Additionally, the low impedance resistor 303 has a value of 300 ohms in the preferred embodiment. The smart switch 305 contains a quarter wavelength transmission line 307 and to a first diode 309 and a second diode 311. Upon insertion of the external antenna 107 into the external antenna connector 109, the 6 volts on the center conductor biases the first diode 309 and the second diode 311, turning the diodes 309, 311 on. With the diodes 309, 311 on, the quarter wavelength transmission line 307 looks like an open circuit to the second antenna's transmission line 117, thus, the second antenna's transmission line 117 is effectively coupled to the duplexer 125. With the second antenna 107 removed from the external antenna connector 109, the first and second diodes 309, 311 are no longer biased by the voltage provided in the center conductor 205. Thus, the first antenna 105 is directly coupled to the duplexer 125 via the transmission line 307.
FIG. 4 is a detailed illustration of an alternative electronic switching system. Here, the coil cord connector 111 contains the exact circuitry of that discussed in FIG. 1 and uses the smart switch 305 of FIG. 3. Unlike FIG. 3, the coil cord connector 111 couples the center conductor 205 to an electrical ground. A bias circuit 401 is coupled to the second antenna's transmission line 117 to provide the proper bias for the diodes contained within the smart switch 305. Upon insertion of the coil cord connector 111 of the second antenna 107 into the external antenna connector 109, the center conductor is coupled to the transmission line 117. The transmission line 117 provides a DC path to ground for the antenna detector circuit 401. In response, the transistor in the antenna detector circuit 401 generates a bias current for the diodes in the smart switch 305.
FIG. 5 is a detailed illustration of an alternative electronic antenna switching system. Here, the coil cord connector 111 is identical to that discussed in FIG. 1. Here, a switch 501 contains a first FET 503 and a second FET 505 and a quarter wavelength transmission line 507. Upon insertion of the second antenna 107 into the external antenna connector 109, an antenna detector circuit 509 provides a switching control signal 511 to the switch 501. The switching control signal 511 turns on the first and second fets 503, 505 generating a short circuit between the source and a drain of the FET transistors 503, 505. When the FET transistors 503, 505 are short circuits, the quarter wavelength transmission line 507 looks like an open circuit to the second antenna's transmission line 117 thus providing a direct RF connection to the duplexer 125 through the switch 501. When the second antenna 107 is not present, the first and second FET transistors 503, 505 are no longer turned on thus they look like open circuits to the first antenna 105. Thus, providing a direct connection between the first antenna 105 and the duplexer 125.
What is claimed is:

Claims

1. An electronic antenna switching system comprising: a first antenna; a second antenna detachably coupled to the electronic antenna switching system; an electronic antenna detector circuit coupled to a first portion of the second antenna for detecting the presence of the second antenna and for generating a switching signal responsive thereto; and a switch having a first, a second and a third transmission path and a first control input, the first transmission path coupled to a first end of the first antenna, the second transmission path coupled to a first end of the second antenna, the switching signal coupled to the control input of the switch, the switch switching the coupling of the first and the second transmission path to the third transmission path responsive to the control input.
2. An electronic antenna switching system in accordance with claim 1 further comprising: a coax for coupling the second antenna to the electronic antenna detector and the switch, the coax having a center conductor, an outer conductor and a dielectric therebetween.
3. An electronic antenna switching system in accordance with claim 2 further comprising: a voltage generator for generating a predetermined voltage, the predetermined voltage is coupled to the center conductor of the coax.
4. An electronic antenna switching system in accordance with claim 2 further comprising an electrical ground connector, the electrical ground connector coupled to the center conductor of the coax.
5. An electronic antenna switching system in accordance with claim 2 further comprising a DC block coupled between the second antenna and the center conductor of the coax.
6. An electronic antenna switching system in accordance with claim 3 wherein a high impedance resistor is coupled between the predetermined voltage and the center conductor of the coax.
7. An electronic antenna switching system in accordance with claim 3 wherein the electronic antenna detector circuit generates the switching signal responsive to detecting the presence of the predetermined voltage on the center conductor of the coax.
8. An electronic antenna switching system in accordance with claim 4 wherein the electronic antenna detector circuit generates the switching signal responsive to detecting the electrical ground coupled to the center conductor of the coax.
9. An electronic antenna switching system comprising: a first antenna; a second antenna having a first end detachably coupled to the electronic antenna switching system; a switch having a first, a second and a third transmission path, the first transmission path coupled to a first end of the first antenna, the second transmission path coupled to a first end of the second antenna, the switch switching the coupling of the first and the second transmission path to the third transmission path responsive to the second antenna coupling to the electronic antenna switching system.
10. An electronic antenna switching system in accordance with claim 9 wherein the switch further comprises: a first diode, a first end of the first diode coupled to the first signal input, a second end of the first diode coupled to an electrical ground; a second diode, a first end of the second diode coupled to the second signal input; and a quarter wavelength transmission line coupled between a first end of the second diode and the second end of the first diode.
PCT/US1994/010950 1993-11-09 1994-09-29 Electronic antenna switching system WO1995013668A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU79208/94A AU7920894A (en) 1993-11-09 1994-09-29 Electronic antenna switching system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14944393A 1993-11-09 1993-11-09
US08/149,443 1993-11-09

Publications (1)

Publication Number Publication Date
WO1995013668A1 true WO1995013668A1 (en) 1995-05-18

Family

ID=22530302

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/010950 WO1995013668A1 (en) 1993-11-09 1994-09-29 Electronic antenna switching system

Country Status (4)

Country Link
AU (1) AU7920894A (en)
FR (1) FR2712443A1 (en)
WO (1) WO1995013668A1 (en)
ZA (1) ZA948177B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2317993A (en) * 1996-10-02 1998-04-08 Ico Services Ltd Antenna switching means for portable radio apparatus
WO1998025323A1 (en) * 1996-12-04 1998-06-11 Qualcomm Incorporated Dual-band antenna coupler for a portable radiotelephone
US6205344B1 (en) 1994-05-06 2001-03-20 Motorola, Inc. Power adapter with integral radio frequency port
US6486835B1 (en) 2001-01-31 2002-11-26 Nokia Mobile Phones, Ltd. Method and apparatus for detecting physical position of a retractable antenna
US7440785B2 (en) * 2003-03-07 2008-10-21 Nortel Networks Limited Method and apparatus for enhancing link range in a wireless network using self-configurable antenna
US7466999B2 (en) 2006-03-09 2008-12-16 Wistron Corporation Wireless communication device capable of switching to an external antenna module or an internal antenna module
WO2013089553A1 (en) 2011-12-16 2013-06-20 Mimos Berhad A system and method to detect and switch between internal and external antennas
EP3041149A1 (en) * 2014-12-29 2016-07-06 Thomson Licensing Antenna switching arrangement and corresponding device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076155A (en) * 1962-05-31 1963-01-29 Carlyle V Parker Electronic rf switch
US4803447A (en) * 1988-02-29 1989-02-07 Motorola, Inc. Three terminal remotely controlled SPDT antenna switch
US4987392A (en) * 1988-10-17 1991-01-22 Motorola, Inc. Gallium arsenide antenna switch
US5047674A (en) * 1988-10-17 1991-09-10 Motorola, Inc. Gallium arsenide antenna switch having voltage multiplier bias circuit
US5060293A (en) * 1989-10-20 1991-10-22 Motorola, Inc. Antenna switch for transmit-receive operation using relays and diodes
US5103195A (en) * 1989-10-13 1992-04-07 Hewlett-Packard Company Hybrid gaas mmic fet-pin diode switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076155A (en) * 1962-05-31 1963-01-29 Carlyle V Parker Electronic rf switch
US4803447A (en) * 1988-02-29 1989-02-07 Motorola, Inc. Three terminal remotely controlled SPDT antenna switch
US4987392A (en) * 1988-10-17 1991-01-22 Motorola, Inc. Gallium arsenide antenna switch
US5047674A (en) * 1988-10-17 1991-09-10 Motorola, Inc. Gallium arsenide antenna switch having voltage multiplier bias circuit
US5103195A (en) * 1989-10-13 1992-04-07 Hewlett-Packard Company Hybrid gaas mmic fet-pin diode switch
US5060293A (en) * 1989-10-20 1991-10-22 Motorola, Inc. Antenna switch for transmit-receive operation using relays and diodes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ADDISON-WESLEY PUBLISHING COMPANY, "Field and Wave Electromagnetics", Second Edition, Copyright 1989, page 428. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6205344B1 (en) 1994-05-06 2001-03-20 Motorola, Inc. Power adapter with integral radio frequency port
US6212415B1 (en) 1994-05-06 2001-04-03 Motorola, Inc. Power adapter with integral radio frequency port
US5852421A (en) * 1996-04-02 1998-12-22 Qualcomm Incorporated Dual-band antenna coupler for a portable radiotelephone
GB2317993A (en) * 1996-10-02 1998-04-08 Ico Services Ltd Antenna switching means for portable radio apparatus
WO1998025323A1 (en) * 1996-12-04 1998-06-11 Qualcomm Incorporated Dual-band antenna coupler for a portable radiotelephone
AU724641B2 (en) * 1996-12-04 2000-09-28 Qualcomm Incorporated Dual-band antenna coupler for a portable radiotelephone
US6486835B1 (en) 2001-01-31 2002-11-26 Nokia Mobile Phones, Ltd. Method and apparatus for detecting physical position of a retractable antenna
US7440785B2 (en) * 2003-03-07 2008-10-21 Nortel Networks Limited Method and apparatus for enhancing link range in a wireless network using self-configurable antenna
US8483762B2 (en) 2003-03-07 2013-07-09 Apple Inc. Method and apparatus for enhancing link range in a wireless network using a self-configurable antenna
US7466999B2 (en) 2006-03-09 2008-12-16 Wistron Corporation Wireless communication device capable of switching to an external antenna module or an internal antenna module
WO2013089553A1 (en) 2011-12-16 2013-06-20 Mimos Berhad A system and method to detect and switch between internal and external antennas
EP3041149A1 (en) * 2014-12-29 2016-07-06 Thomson Licensing Antenna switching arrangement and corresponding device
WO2016107721A1 (en) * 2014-12-29 2016-07-07 Thomson Licensing Antenna switching arrangement and corresponding device

Also Published As

Publication number Publication date
AU7920894A (en) 1995-05-29
FR2712443A1 (en) 1995-05-19
ZA948177B (en) 1995-06-08

Similar Documents

Publication Publication Date Title
US6212415B1 (en) Power adapter with integral radio frequency port
EP0641090B1 (en) Antenna switching device
US5144324A (en) Antenna arrangement for a portable transceiver
US6154177A (en) Antenna device and radio receiver using the same
US6526263B1 (en) Antenna impedance adjuster
US4677688A (en) Radio transceiver including an antenna switching circuit
US6144346A (en) Antenna arrangement
EP1965502B1 (en) Antenna device and portable radio communication device comprising such antenna device
US5212491A (en) Antenna arrangement for a portable transceiver
US6738603B1 (en) Radio communication apparatus with retractable antenna and its impedance matching method
US6718157B1 (en) Apparatus for commonly using antenna for call signal and television broadcasting signal in radio communication terminal
US7349718B2 (en) Portable telephone set
WO1995013668A1 (en) Electronic antenna switching system
US4361905A (en) Arrangement for connecting selected antennas to a radio for transmitting and receiving
US4637065A (en) Broadband solid state antenna switch
EP1087538B1 (en) Transmitting-receiving switch
JP2919319B2 (en) Impedance matching device
JP4249367B2 (en) Antenna device
JPH06112850A (en) Static electricity protection circuit
JPH06197043A (en) High frequency switch
CA1326290C (en) Cordless telephone antenna arrangement
JP2586181B2 (en) Diversity receiver
JP3288227B2 (en) Antenna shared circuit
US6112060A (en) Communication device with a signal switch assembly
KR970000654B1 (en) Antenna impedance control device of cellular phone

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AT AU BB BG BR BY CA CH CN CZ DE DK ES FI GB GE HU JP KE KG KP KR KZ LK LT LU LV MD MG MN MW NL NO NZ PL PT RO RU SD SE SI SK TJ TT UA UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE MW SD SZ BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA