EP1414102A1 - Commutateur d' antenne - Google Patents

Commutateur d' antenne Download PDF

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Publication number
EP1414102A1
EP1414102A1 EP02023969A EP02023969A EP1414102A1 EP 1414102 A1 EP1414102 A1 EP 1414102A1 EP 02023969 A EP02023969 A EP 02023969A EP 02023969 A EP02023969 A EP 02023969A EP 1414102 A1 EP1414102 A1 EP 1414102A1
Authority
EP
European Patent Office
Prior art keywords
filter
antenna switch
antenna
frequency
switch according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02023969A
Other languages
German (de)
English (en)
Inventor
Volker Wannenmacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP02023969A priority Critical patent/EP1414102A1/fr
Publication of EP1414102A1 publication Critical patent/EP1414102A1/fr
Withdrawn legal-status Critical Current

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Classifications

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

Definitions

  • the present invention relates to an antenna switch for the simultaneous reception of at least two frequency bands.
  • Antenna switches of this type are used, inter alia, in mobile radio terminals.
  • Third generation mobile terminal devices for example based on the UMTS (Universal Mobile Telecommunications System) - standard based mobile terminal devices, will continue to be the established standards GSM (Global System for Mobile Communications), DCS (Digital Cellular System) and PCS (Personal) Communications Service) support. It is also considered to support two operating modes simultaneously, for example simultaneous reception of UMTS and GSM or simultaneous reception of UMTS and DCS.
  • GSM Global System for Mobile Communications
  • DCS Digital Cellular System
  • PCS Personal Communications Service
  • the problem here is the switching of the high-frequency paths for the signal coming from the antenna.
  • simultaneous reception operation for DCS and UMTS is very desirable, but technically difficult to implement, since this is associated with high attenuation and is expensive to implement.
  • a known switching device is shown in Figure 4a.
  • the connection 1 shown serves as the input for the receive signals or as the output for the transmit signals.
  • a high-frequency switch 3 can either be DCS reception via a filter 20, or UMTS transmission / reception operation via a duplex filter 21.
  • RX stands for reception and TX for transmission.
  • the arrangement shown in FIG. 4a is simple and integrable, but has the disadvantage that it does not allow UMTS and DCS to be received at the same time.
  • Antenna switching devices for radio telephones similar to FIG. 4a are known from EP 0 823 751 A2. In the embodiments shown therein, however, it is either not possible to receive two frequency bands simultaneously (FIGS. 1-4, 8, 9) or two antennas (FIGS. 6, 7, 10-14) or a two-band antenna system consisting of two antennas ( Figure 5) needed.
  • FIG. 4b Another known arrangement is shown in Figure 4b.
  • the input or output 1 leads to a triplexer 6, i.e. a triple filter arrangement for band separation.
  • a triplexer 6 i.e. a triple filter arrangement for band separation.
  • such an arrangement is difficult to implement due to the small distance between the frequencies to be separated from DCS RX and UMTS TX and leads to very voluminous, expensive filters with high attenuation.
  • such a triplexer is an expensive special development.
  • FIG. 4c Another known order is shown in Figure 4c.
  • a single filter arrangement is used there.
  • the transformation lines 22 ensure that an idle for the respective blocking region is generated at the branch point.
  • the problem here is that the filters 21a and 21b cannot be integrated into a module as a ceramic filter.
  • the transformation lines 22 also run, at least in part, outside of a corresponding module.
  • the proposed arrangement according to FIG. 4c is thus heavily dependent on the layout of the circuit board, ie the specification of the line length.
  • only very few manufacturers offer individual filters, making them expensive.
  • a high-frequency antenna switch is known from EP 0 928 038 A1.
  • a PIN diode bridges two LC elements connected in series. This arrangement has the sole purpose of compensating for parasitic effects of the PIN diode of the two frequencies 900 and 1800 MHz.
  • the use of the high-frequency switch shown for the simultaneous reception of at least two frequency bands is not known from EP 0 928 038 A1.
  • the antenna switch is suitable for simultaneously receiving signals of a first and a second frequency band when the high-frequency switch is switched to the first signal branch, the first frequency band in the first signal branch and the second frequency band in the second signal branch being receivable.
  • the first frequency band is preferably a GSM frequency band, for example GSM 1800 or GSM 1900, and the second frequency band is a UMTS frequency band.
  • the band stop is a parallel connection of an inductor and a capacitor.
  • LTCC stands for "Low Temperature Cofired Ceramic-Technology”.
  • LTCC is a technology for making multi-layer circuits using single tapes that are used to apply conductive, dielectric and / or resistive pastes thereon. The individual layers are connected and burned together.
  • the first signal branch has a transformation line. This transformation power is preferably connected upstream of the first filter.
  • the first filter is further preferably a SAW (Surface Acoustic Wave) filter.
  • the SAW filter can be integrated into a module, particularly preferably an LTCC module.
  • SAW filters have the advantage of low losses, compact design and simple impedance matching.
  • the second filter is more preferably a ceramic filter.
  • the high-frequency switch can have PIN diodes or transistors.
  • the second filter is designed together with a further filter as a duplex filter.
  • the elements of the antenna switch that is to say the high-frequency switch, bandstop, transformation line and SAW filter, are preferably integrated in one module.
  • the duplex filter is not in the module.
  • the antenna switch is suitable for sending signals of the second frequency band when the high-frequency switch is switched to the second signal branch.
  • FIG. 1 shows a schematic representation of an antenna switch according to the present invention.
  • RX in turn stands for reception and TX for transmission.
  • the band stop 8 suppresses a received DCS signal (DCS RX) which flows to the SAW filter 4.
  • a UMTS reception signal (UMTS RX) is blocked by the filter 4, but can pass the band stop 8 and passes through the filter 5b.
  • the transformation line 7 ensures that the SAW filter 4 represents an idle for the UMTS reception frequency (UMTS RX) at the branch point. In this switch position, UMTS and DCS reception are possible at the same time, but UMTS transmission is impossible.
  • the band stop 8 is bridged and the signal coming from 1 is fed to the ceramic filter 5b.
  • UMTS transmission and reception is possible, but no DCS reception.
  • the two filters 5a and 5b are integrated in a duplex filter 5.
  • the advantage here is that a standard duplexer can be used and a small, inexpensive SAW filter can be used for DCS reception.
  • no ceramic filter is necessary.
  • the SAW filter 4 can be integrated into a module, for example LTCC, so that the transformation line 7 can also run completely in the module.
  • the present arrangement is therefore layout-independent since there are no external transformation lines.
  • the band stop 8 does not have to be particularly narrow-band, nor do it need to provide particularly good suppression. It can be easily implemented and integrated in LTCC.
  • the somewhat increased attenuation of the UMTS received signal (UMTS RX) in the switch position shown in FIG. 1 can be problematic his. However, this is tolerable since this operating mode is only used for monitoring in the neighboring cells.
  • FIG. 2 shows an embodiment of the present invention, in which the switch function is performed by the two PIN diodes 12 and 13. These are always traversed by the same current fed in at the control input 11.
  • the band stop 8 is designed as a simple LC parallel circuit.
  • the components 15 to 19 are used for DC decoupling and have no high-frequency effect.
  • the diode 13 acts like a short circuit, which is converted into an open circuit at 1 via the transformation line 14. This connects a signal via 1, the diode 12 and the blocking capacitors 15 and 16 for all frequencies to the duplex filter 5, the parallel circuit 8 being bridged. This enables normal UMTS transmission and reception.
  • a DCS signal cannot pass from 1 to the duplexer 5, since the parallel circuit 8 prevents this. Instead, the signal reaches components 14 and 7 of the DCS SAW filter 4.
  • a UMTS reception signal can pass through the parallel circuit and reaches the UMTS RX output of the duplexer 5. Line 7 is dimensioned so that the impedance of the Filters 4 at UMTS RX frequency is transformed into an idle at 1, so that the transmission from 1 to duplex filter 5 remains undisturbed.
  • the attenuation was 1.4 dB for UMTS RX (without duplexer losses). Since, as already explained, this operating case is only used for monitoring, this value is acceptable.
  • FIG. 3 shows a further embodiment of the present invention.
  • FIG. 3 shows an antenna switching arrangement with an antenna 9, a multiple switch 2, a high-frequency switch 3, a band stop 8, a transformation line 7, a SAW filter 4 and a duplex filter 5.
  • the antenna 9 is switched by the multiple switch 2 switched to the transmit or receive connections 2a to 2d, which are assigned to other bands, such as GSM 900 and GSM 1900.
  • Connection 2e which is provided for common UMTS multiple switches, can be expanded for simultaneous UMTS and DCS operation.
  • the arrangement can be completely integrated in a module 10.
  • the present invention makes it possible to expand an existing module 2, which has an output for UMTS, in the manner described. Furthermore, there is the possibility of integrating the circuit together with the multiple changeover switch 2 into a single module.

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EP02023969A 2002-10-25 2002-10-25 Commutateur d' antenne Withdrawn EP1414102A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02023969A EP1414102A1 (fr) 2002-10-25 2002-10-25 Commutateur d' antenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02023969A EP1414102A1 (fr) 2002-10-25 2002-10-25 Commutateur d' antenne

Publications (1)

Publication Number Publication Date
EP1414102A1 true EP1414102A1 (fr) 2004-04-28

Family

ID=32050027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02023969A Withdrawn EP1414102A1 (fr) 2002-10-25 2002-10-25 Commutateur d' antenne

Country Status (1)

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EP (1) EP1414102A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964477A1 (fr) * 1998-06-11 1999-12-15 Tokin Corporation Dispositif de partage d' antenne pour deux bandes de fréquence
EP1168650A1 (fr) * 1999-12-28 2002-01-02 Hitachi Metals, Ltd. Commutateur haute frequence, module de commutation haute frequence et dispositif de communications sans fil
EP1187357A1 (fr) * 2000-03-15 2002-03-13 Hitachi Metals, Ltd. Module haute frequence et dispositif de communication sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0964477A1 (fr) * 1998-06-11 1999-12-15 Tokin Corporation Dispositif de partage d' antenne pour deux bandes de fréquence
EP1168650A1 (fr) * 1999-12-28 2002-01-02 Hitachi Metals, Ltd. Commutateur haute frequence, module de commutation haute frequence et dispositif de communications sans fil
EP1187357A1 (fr) * 2000-03-15 2002-03-13 Hitachi Metals, Ltd. Module haute frequence et dispositif de communication sans fil

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