DE602005028741C5 - Frontend-topologie für mehrband-multimodus-kommunikationssysteme - Google Patents

Frontend-topologie für mehrband-multimodus-kommunikationssysteme Download PDF

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Publication number
DE602005028741C5
DE602005028741C5 DE602005028741.8A DE602005028741A DE602005028741C5 DE 602005028741 C5 DE602005028741 C5 DE 602005028741C5 DE 602005028741 A DE602005028741 A DE 602005028741A DE 602005028741 C5 DE602005028741 C5 DE 602005028741C5
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Prior art keywords
bandpass filter
frequency band
switch
antenna
signal path
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DE602005028741C9 (de
Inventor
Tero Ranta
Juha Ellä
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Nokia Technologies Oy
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Nokia Technologies Oy
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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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/0057—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
    • 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
    • H04B1/44—Transmit/receive switching
    • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter
    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • 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
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • 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
    • H04B1/44—Transmit/receive switching

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

Abstract

Apparatus (800; 802; 803; 804; 812; 813; 814) comprising:a first bandpass filter (226; 156; 346) disposed in a first signal path (220; 150) for filtering radio frequency signals in a first frequency band, the first bandpass filter having a first end and a second end, the first end operatively connectable to an antenna (12; 13; 14);a second bandpass filter (246; 116; 326) disposed in a second signal path (240; 110) for filtering radio frequency signals in a second frequency band different from the first frequency band; the second bandpass filter operatively connectable to said antenna; anda switch (225; 155; 345) having a first, on state and a second, off state disposed at the second end of the first bandpass filter independent of the second signal path for enabling or disabling the first signal path, wherein the switch is connected in shunt to ground such that when the switch is biased to on, the first bandpass filter is turned off.

Description

  • According to a first aspect of the present invention, there is provided apparatus comprising a first bandpass filter disposed in a first signal path for filtering radio frequency signals in a first frequency band, the first bandpass filter having a first end and a second end, the first end operatively connectable to an antenna, a second bandpass filter disposed in a second signal path for filtering radio frequency signals in a second frequency band different from the first frequency band, the second bandpass filter operatively connectable to the antenna, and a switch having a first, on state and a second, off state disposed at the second end of the first bandpass filter independent of the second signal path for enabling or disabling the first signal path, wherein the switch is connected in shunt to ground such that when the switch is biased to on, the first bandpass filter is turned off.
  • The apparatus may further comprise a matching element disposed between the first end of the first bandpass filter and the antenna. The first signal path may comprise a transmit path and the second signal path comprises a receive path.
  • Thefirst signal path may comprise a first receive path and the second signal path may comprise a second receive path, the second bandpass filter may have a first end and a second end, the first end of the second bandpass filter operatively connectable to the antenna, and the apparatus may further comprise a further switch disposed at the second end of the second bandpass filter for enabling or disabling the second signal path, wherein the further switch is connected in shunt to ground such that when the switch is biased to on, the further bandpass filter is turned off. The apparatus may further comprise a balun operatively connectable to the antenna, and both the first end of the first bandpass filter and the first end of the second bandpass filter may be operatively connectable to the antenna via the balun. The balun may have a first balun end and
    a second balun end, the first balun end operatively connectable to the antenna, the second balun end connectedto the first end of the first filter and the second balun end may also be connected to the first end of the second filter, and the transceiver may further comprise a second switch disposed in the second receive path and operatively connected to the second end of the second filter.
  • The first frequency band may have a frequency range substantially between 1805MHz and 1880MHz, and the second frequency band may have a frequency range substantially between 1930MHz and 1990MHz. The first frequency band may have a frequency range substantially between 869MHz and 894MHz, and the second frequency band may have a frequency range substantially between 925MHz and 960MHz.
  • The apparatus may further comprise a matching element operatively connectable to the antenna, a third bandpass filter disposed in a transmit path for filtering signals in a third frequency band, the third bandpass filter having a first end and a second end, the first end operatively connected to the matching element, and a third switch disposed in the transmit path and operatively connected to the second end of the third bandpass filter. The third frequency band may have a frequency range substantially between 824MHz and 849MHz. The third frequency band may have a frequency range substantially between 880MHz and 905MHz.
  • The apparatus may further comprise a matching element operatively connectable to the antenna, a third bandpass filter disposed in a transmit path for filtering signals in a third frequency band, the third bandpass filter having a first end and a second end, the first end operatively connected to the matching element, and a third switch disposed in the transmit path and operatively connected to the second end of the third bandpass filter. The third frequency band may have a frequency range substantially between 1710MHz and 1785MHz. The third frequency band may have a frequency range substantially between 1850MHz and 1910MHz.
  • The apparatus may further comprise a further matching element operatively connectable to the antenna, a fourth bandpass filter disposed in a further transmit path for filtering signals in a fourth frequency band, the fourth bandpass filter having a first end and a second end, the first end operatively connected to the further matching element, and a fourth switch disposed in the further transmit path and operatively connected to the second end of the fourth bandpass filter. The third frequency band may have a third frequency range substantially between 1710MHz and 1785MHz, and the fourth frequency range substantially between 1850 and 1910MHz. The third frequency band may have a third frequency range substantially between 1920MHz and 1980MHz, and the fourth frequency range substantially between 1710 and 1910MHz.
  • The apparatus may further comprise a further balun, and a fifth bandpass filter disposed in another receive path for filtering signals in a fifth frequency band, the fifth bandpass filter operatively connectable to the antenna via the further balun, and the fifth frequency band may have a frequency range substantially between 2110MHz and 2170MHz.
  • The apparatus may be operated in a first mode in code-division multiplex access fashion and a second mode in GSM, and the apparatus may further comprise a first amplifier for amplifying signals in the first mode, a second amplifier for amplifying signals in the second mode, and a group of further switches including a first, a second, a third and a fourth further switches, each having a first end and a second end, wherein the first end of the first further switch is operatively connectable to the transmit path, and the second end of the first further switch is operatively connected to the first amplifier, the first end of the second further switch is operatively connectable to the transmit path, and the second end of the second further switch is operatively connected to the second amplifier, the first end of the third further switch is operatively connectable to the further transmit path, and the second end of the third further switch is operatively connected to the first amplifier, and the first end of the first further switch is operatively connectable to the further transmit path, and the second end of the fourth further switch is operatively connected to the second amplifier.
  • The apparatus may further comprise a matching element disposed between the antenna and the balun, the matching element having a first matching element end connectable to the antenna and a second matching element end connected to the balun, and a further balun disposed between the matching element and the second bandpass filter, the further balun having a first balun end connected to the second matching element end and a second balun end connected to the second bandpass filter. The first frequency band may have a first frequency range substantially between 1930MHz and 1990MHz, and the second frequency band may have a second frequency range substantially between 2110MHz and 2170MHz. The apparatus may further comprise a second matching element, a third bandpass filter disposed in a transmit path for filtering signals in the third frequency band, the third bandpass filter hav-ing a first end and a second end, the first end operatively connectable to the antenna through the second matching element, and a second switch connect-ed to the second end of the third bandpass filter. The apparatus may further comprise a third matching ele-ment, a fourth bandpass filter disposed in a further trans-mit path for filtering signals in the fourth frequency band, the fourth bandpass filter having a first end and a second end, the first end operatively connectable to the antenna through the third matching element, and a second switch connected to the second end of the fourth bandpass filter. The first frequency band may have a first frequency range substantially between 1930MHz and 1990MHz, the second frequency band may have a second frequency range substantially between 2110MHz and 2170MHz, the third frequency band may have a third frequency range substantially between 1710MHz and 1785MHz, and the fourth frequency band may have a fourth frequency range substantially between 1850MHz and 1910MHz.
  • There may be provided a communications device comprising an antenna for conveying radio frequency signals, and the apparatus. There may be provided a mobile terminal comprising the communications device.
  • According to a second aspect of the present invention, there is provided a method comprising bandpass filtering radio frequency signals conveyed via a first signal path to or from an antenna so as to provide signals in a first frequency band, bandpass filtering radio frequency signals conveyed via a second signal path to or from the antenna so as to provide signals in a second frequency band different from the first frequency band, and switching the signals conveyed via the first signal path independently of the second signal path using a switch having a first, on state and a second, off state so as to selectively enable the first signal path, wherein the switch is connected in shunt to ground such that when the switch is biased to on, bandpass filtering in the first signal path is turned off, and wherein the signals conveyed frdom the antenna are switched after the filtering thereof and the signals conveyed to the antenna are switched before the filtering thereof.
  • The first signal path may comprise a transmit path and the second signal path may comprise a receive path, said method may further comprise delaying the signals conveyed in the first signal path after the filtering thereof.
  • The first signal path may comprise a first receive path and the second signal path may comprise a second receive path, said method may further comprise switch-ing the signals conveyed via the second signal path so as to selectively enable the second signal path, wherein the signals are switched after the filtering thereof. The method may further comprise balancing using a balun the signals conveyed via the first and second signal paths before the filtering thereof, wherein switching the signals conveyed via the second signal path is performed via a second switch connected in shunt to ground such that when the second switch is biased to on, bandpass filtering in the second signal path is turned off.

Claims (31)

  1. Apparatus (800; 802; 803; 804; 812; 813; 814) comprising: a first bandpass filter (226; 156; 346) disposed in a first signal path (220; 150) for filtering radio frequency signals in a first frequency band, the first bandpass filter having a first end and a second end, the first end operatively connectable to an antenna (12; 13; 14); a second bandpass filter (246; 116; 326) disposed in a second signal path (240; 110) for filtering radio frequency signals in a second frequency band different from the first frequency band; the second bandpass filter operatively connectable to said antenna; and a switch (225; 155; 345) having a first, on state and a second, off state disposed at the second end of the first bandpass filter independent of the second signal path for enabling or disabling the first signal path, wherein the switch is connected in shunt to ground such that when the switch is biased to on, the first bandpass filter is turned off.
  2. Apparatus according to claim 1, further comprising: a matching element (158) disposed between the first end of the first bandpass filter and said antenna.
  3. Apparatus according to claim 2, wherein the first signal path comprises a transmit path (150) and the second signal path comprises a receive path (110).
  4. Apparatus according to claim 1, wherein the first signal path comprises a first receive path (220) and the second signal path comprises a second receive path (240), and wherein the second bandpass filter has a first end and a second end, the first end of the second bandpass filter operatively connectable to said antenna, said apparatus further comprising: a further switch (245) disposed at the second end of the second bandpass filter for enabling or disabling the second signal path, wherein the further switch is connected in shunt to ground such that when the further switch is biased to on, the further bandpass filter is turned off.
  5. Apparatus according to claim 4, further comprising a balun (272) operatively connectable to said antenna, and wherein both the first end of the first bandpass filter and the first end of the second bandpass filter are operatively connectable to said antenna via the balun.
  6. Apparatus according to claim 5, wherein the balun (272) has a first balun end and a second balun end, the first balun end operatively connectable to said antenna, the second balun end connected to the first end of the first filter and wherein the second balun end is also connected to the first end of the second filter, said apparatus further comprising: a second switch (245) disposed in the second receive path and operatively connected to the second end of the second filter.
  7. Apparatus according to claim 6, wherein the first frequency band has a frequency range substantially between 1805MHz and 1880MHz, and the second frequency band has a frequency range substantially between 1930MHz and 1990MH2.
  8. Apparatus according to claim 6, wherein the first frequency band has a frequency range substantially between 869MHz and 894MHz, and the second frequency band has a frequency range substantially between 925MHz and 960MHz.
  9. Apparatus according to claim 8, further comprising: a matching element (158) operatively connectable to said antenna; a third bandpass filter (156) disposed in a transmit path (150) for filtering signals in a third frequency band, the third bandpass filter having a first end and a second end, the first end operatively connected to the matching element; and a third switch (155) disposed in the transmit path and operatively connected to the second end of the third bandpass filter.
  10. Apparatus according to claim 9, wherein the third frequency band has a frequency range substantially between 824MHz and 849MHz.
  11. Apparatus according to claim 9, wherein the third frequency band has a frequency range substantially between 880MHz and 905MHz.
  12. Apparatus according to claim 7, further comprising: a matching element (268; 564) operatively connectable to said antenna; a third bandpass filter (266; 554) disposed in a transmit path for filtering signals in a third frequency band, the third bandpass filter having a first end and a second end, the first end operatively connected to the matching element; and a third switch (265; 544) disposed in the transmit path and operatively connected to the second end of the third bandpass filter.
  13. Apparatus according to claim 12, wherein the third frequency band has a frequency range substantially between 1710MHz and 1785MHz.
  14. Apparatus according to claim 12, wherein the third frequency band has a frequency range substantially between 1850MHz and 1910MHz.
  15. Apparatus according to claim 12, further comprising: a further matching element (348; 562) operatively connectable to said antenna; a fourth bandpass filter (346; 552) disposed in a further transmit path (340) for filtering signals in a fourth frequency band, the fourth bandpass filter having a first end and a second end, the first end operatively connected to the further matching element; and a fourth switch (345; 542) disposed in the further transmit path and operatively connected to the second end of the fourth bandpass filter.
  16. Apparatus according to claim 15, wherein the third frequency band has a third frequency range substantially between 1710MHz and 1785MHz, and the fourth frequency range substantially between 1850 and 1910MHz.
  17. Apparatus according to claim 15, wherein the third frequency band has a third frequency range substantially between 1920MHz and 1980MHz, and the fourth frequency range substantially between 1710 and 1910MHz.
  18. Apparatus according to claim 16, further comprising: a further balun (332); and a fifth bandpass filter (326) disposed in another receive path (320) for filtering signals in a fifth frequency band, the fifth bandpass filter operatively connectable to said antenna via the further balun, wherein the fifth frequency band has a frequency range substantially between 2110MHz and 2170MHz.
  19. Apparatus according to claim 17, further comprising: a further balun (332); and a fifth bandpass filter (326) disposed in another receive path (320) for filtering signals in a fifth frequency band, the fifth bandpass filter operatively connectable to said antenna via the further balun, wherein the fifth frequency band has a frequency range substantially between 2110MHz and 2170MHz..
  20. Apparatus according to claim 18, wherein the apparatus is operated in a first mode in code-division multiplex access fashion and a second mode in GSM, said apparatus further comprising: a first amplifier (522) for amplifying signals in the first mode; a second amplifier (524) for amplifying signals in the second mode; and a group of further switches including a first, a second, a third and a fourth further switches (531, 532, 533, 534), each having a first end and a second end, wherein the first end of the first further switch is operatively connectable to the transmit path (510), and the second end of the first further switch is operatively connected to the first amplifier; the first end of the second further switch is operatively connectable to the transmit path (510), and the second end of the second further switch is operatively connected to the second amplifier; the first end of the third further switch is operatively connectable to the further transmit path (520), and the second end of the third further switch is operatively connected to the first amplifier; and the first end of the first further switch is operatively connectable to the further transmit path (520), and the second end of the fourth further switch is operatively connected to the second amplifier.
  21. Apparatus according to claim 5, further comprising: a matching element disposed between said antenna and the balun, the matching element having a first matching element end connectable to said antenna and a second matching element end connected to the balun; and a further balun disposed between the matching element and the second bandpass filter, the further balun having a first balun end connected to the second matching element end and a second balun end connected to the second bandpass filter.
  22. Apparatus according to claim 21, wherein the first frequency band has a first frequency range substantially between 1930MHz and 1990MHz, and the second frequency band has a second frequency range substantially between 2110MHz and 2170MHz.
  23. Apparatus according to claim 21, further comprising: a second matching element (562); a third bandpass filter (552) disposed in a transmit path (510) for filtering signals in the third frequency band, the third bandpass filter having a first end and a second end, the first end operatively connectable to said antenna through the second matching element; and a second switch (542) connected to the second end of the third bandpass filter.
  24. Apparatus according to claim 23, further comprising: a third matching element (564); a fourth bandpass filter (554) disposed in a further transmit path (520) for filtering signals in the fourth frequency band, the fourth bandpass filter having a first end and a second end, the first end operatively connectable to said antenna through the third matching element; and a second switch (544) connected to the second end of the fourth bandpass filter.
  25. Apparatus according to claim 23, wherein the first frequency band has a first frequency range substantially between 1930MHz and 1990MHz; the second frequency band has a second frequency range substantially between 2110MHz and 2170MHz; the third frequency band has a third frequency range substantially between 1710MHz and 1785MHz; and the fourth frequency band has a fourth frequency range substantially between 1850MHz and 1910MHz.
  26. A communications device comprising: an antenna (12; 13; 14) for conveying radio frequency signals; and apparatus (802; 803; 804; 812; 813 ; 814) according to any preceding claim.
  27. A mobile terminal (1) comprising a communications device according to claim 26.
  28. A method comprising: bandpass filtering radio frequency signals conveyed via a first signal path to or from an antenna so as to provide signals in a first frequency band; bandpass filtering radio frequency signals conveyed via a second signal path to or from the antenna so as to provide signals in a second frequency band different from the first frequency band; and switching the signals conveyed via the first signal path independently of the second signal path using a switch having a first, on state and a second, off state so as to selectively enable the first signal path, wherein the switch is connected in shunt to ground such that when the switch is biased to on, bandpass filtering in the first signal path is turned off, and wherein the signals conveyed from the antenna are switched after the filtering thereof and the signals conveyed to the antenna are switched before the filtering thereof.
  29. A method according to claim 28, wherein the first signal path comprises a transmit path and the second signal path comprises a receive path, said method further comprising: delaying the signals conveyed in the first signal path after the filtering thereof.
  30. A method according to claim 28, wherein the first signal path comprises a first receive path and the second signal path comprises a second receive path, said method further comprising: switching the signals conveyed via the second signal path so as to selectively enable the second signal path, wherein the signals are switched after the filtering thereof, wherein switching the signals conveyed via the second signal path is performed via a second switch connected in shunt to ground such that when the second switch is biased to on,_bandpass filtering in the second signal path is turned off.
  31. A method according to claim 30, further comprising: balancing using a balun the signals conveyed via the first and second signal paths before the filtering thereof.
DE602005028741.8A 2004-04-30 2005-03-31 Frontend-topologie für mehrband-multimodus-kommunikationssysteme Active DE602005028741C9 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/836,123 US20050245201A1 (en) 2004-04-30 2004-04-30 Front-end topology for multiband multimode communication engines
US836123 2004-04-30
EP05718321A EP1741183B1 (de) 2004-04-30 2005-03-31 Frontend-topologie für mehrband-multimodus-kommunikationssysteme

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DE602005028741C5 true DE602005028741C5 (de) 2021-02-11
DE602005028741C9 DE602005028741C9 (de) 2021-12-30

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US (1) US20050245201A1 (de)
EP (1) EP1741183B1 (de)
KR (1) KR100861565B1 (de)
CN (1) CN1951006B (de)
AT (1) ATE515107T1 (de)
DE (1) DE602005028741C9 (de)
WO (1) WO2005107064A1 (de)

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ATE515107T1 (de) 2011-07-15
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KR20060135921A (ko) 2006-12-29
CN1951006A (zh) 2007-04-18
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US20050245201A1 (en) 2005-11-03
DE602005028741C9 (de) 2021-12-30

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