EP1238464A2 - Commutateur emission/reception ayant une separation emission/reception amelioree - Google Patents

Commutateur emission/reception ayant une separation emission/reception amelioree

Info

Publication number
EP1238464A2
EP1238464A2 EP00993470A EP00993470A EP1238464A2 EP 1238464 A2 EP1238464 A2 EP 1238464A2 EP 00993470 A EP00993470 A EP 00993470A EP 00993470 A EP00993470 A EP 00993470A EP 1238464 A2 EP1238464 A2 EP 1238464A2
Authority
EP
European Patent Office
Prior art keywords
filters
filter
sub
duplexer according
input
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Withdrawn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
EP00993470A
Other languages
German (de)
English (en)
Inventor
Jürgen MACHUI
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.)
TDK Electronics AG
Original Assignee
Epcos 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 Epcos AG filed Critical Epcos AG
Publication of EP1238464A2 publication Critical patent/EP1238464A2/fr
Withdrawn legal-status Critical Current

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
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Definitions

  • Sending and receiving signals uses a common antenna.
  • a duplexer is therefore generally necessary, which is connected between the antenna and the transmission and reception path.
  • each of the two filters must be able to well suppress a signal located in the other frequency band.
  • Rx filters are required, are in the range of 50 dB and more. At the same time, the respective signals may only experience minimal losses when passing through the filter in the respective frequency band.
  • a typical value for a maximum tolerable damping of the Tx band in the Tx filter is 2 dB or better.
  • duplexers that meet these normal requirements for strip separation (blanking area blanking) and emfuge vaporization are constructed, for example, from microwave ceramic filters. If there is a sufficient band gap between the TX and Rx bands, surface wave filters (SAW filters) can also be used become. However, if the TX and Rx bands are very close to one another, all requirements can only be met with great difficulty or not at all with SAW filters.
  • the object of the present invention is therefore to provide a duplexer for such communication systems, which enables the use of SAW filter technology and thus permits further miniaturization of duplexers.
  • the invention is based on the idea of assembling at least one of the filters between the antenna and RX path (receive filter) and between the antenna and TX path (transmit filter) from at least two sub-filters, the passbands of which lie in adjacent frequency subregions of the required transmit or receive band and doing the whole Cover the tape.
  • These partial filters designed as surface wave filters can then be correspondingly narrower in bandwidth than the filters previously used.
  • Each of the two sub-filters for example, then only has to cover half the bandwidth of the corresponding transmission or reception band.
  • the required total width of the corresponding transmission or reception band results from the addition of the two frequency subregions.
  • a better optimization is possible for a narrow-band SAW filter, which in particular enables the formation of steeper flanks in the pass band.
  • a better separation of the bands is possible even with only one flank improved in the slope, provided that this delimits the corresponding transmission or reception band from the neighboring reception or transmission band.
  • the split filter can thus be designed as an SAW filter, which was not possible until now because of the edges that cannot be set steeply enough and the small bandgap.
  • the invention also enables a better suppression of the other band (transmission or reception band) of 50 dB and more.
  • the adjustment required in conventional microwave ceramic duplexers to set the frequency position is omitted.
  • Both input and output filters are preferably designed as split surface wave filters.
  • the duplexer according to the invention thus consists entirely of SAW filters, so that the advantages of SAW filters over conventional MWK filters or duplexers can be fully exploited.
  • a further miniaturization is possible with a duplexer consisting only of SAW filters, which also means a further miniaturization of the corresponding terminal devices, namely the duplexer according to the invention
  • sub-filters are now provided for frequency sub-ranges in the transmit and receive bands which are narrower than the entire band, suppression of the other band or frequency subrange becomes easier. For example, if input and output filters with a bandwidth of 60 MHz were used for the American CDMA-1900 system, a maximum distance of 20 MHz remained at a duplex spacing of 80 MHz between the two bands (frequency ranges). According to the invention, a distance of 50 MHz is now possible with input and output filters split into at least two sub-filters. This allows better suppression of the other band to be achieved even if the corresponding pass bands are not optimal.
  • the construction of exclusively SAW filters also enables a single-chip solution for all filters of the duplexer.
  • switches for switching between the sub-filters and thus for switching between the frequency sub-ranges can also be provided.
  • a switch By providing a switch, only one of the sub-filters of the split SAW filter is connected to the antenna at a time, so that the other sub-filter (s) do not interfere with the properties of the "active" sub-filter. It is therefore also possible for the sub-filters to be independent of one another If the input and output filters are designed as split SAW filters, then each sub-filter of the input filter is assigned a sub-filter of the output filter, which together form a pair of sub-filters switch or two separate switches may then synchronously. from an active further on a previously passive part pair of filters are switched.
  • the duplexer is designed for sending and receiving within at least two different communication systems that use different frequency bands. This is achieved in a simple manner by multiplying the number of input and output filters and the associated switches accordingly. A separate set of input and output filters and the associated switches are therefore provided for each communication system for which the duplexer according to the invention is designed.
  • terminal devices are provided which are intended for use in two different communication systems (dual-band mobile phone) and which use a separate duplexer for each of these systems.
  • duplexer for more than two communication systems.
  • a switch can switch between partial filter pairs within a communication system as well as between partial filter pairs that belong to two different communication systems.
  • the duplex spacing can also change, and with it the spacing between the frequency sub-ranges of the sub-filter pairs. If the two communication systems are parallel to one another and have different degrees of coverage, then better network coverage is possible for a communication terminal using the duplexer according to the invention. If different communication systems are used in different countries, a correspondingly equipped communication terminal can be used across borders in both systems. Common advantage of ISC is that only one duplexer is required for the different communication systems. In both communication systems, the input and / or output filters can be split up into two or more sub-filters. However, it is also possible for a communication system to have a sufficiently high duplex spacing, which is achieved using an SAW filter for input and output filters is feasible. In combination with a communication system that has split input and / or output filters, a duplexer according to the invention thus has the option of switching between at least three pairs of filters, of which at least two partial titer pairs are SAW-based.
  • All of the input and output filters of the duplexer and, if appropriate, the switches, are preferably arranged in a common housing or at least on a common module. Such a device is easier to handle by the end device manufacturer and is easier to optimize in terms of its properties.
  • a duplexer according to the invention is preferably constructed exclusively from surface wave filters for the receiving and transmitting bands, all of which are integrated on a common piezoelectric substrate or arranged on two substrates. Due to the possible high integration density, the highest degree of miniaturization for the duplexer can be achieved with the first-mentioned embodiment.
  • the common use of other switching and network components for the different filters is also possible on a common substrate, which results in a further increase in the integration density.
  • a simplified adaptation of the filters to one another and to a network is also possible on the common substrate.
  • Substrate material lithium tantalate red y with a cutting angle of 35 to 46 ° (LT35-46) preferred. This material has a particularly good temperature response, with which a transmission behavior with narrow bandwidths and steep flanks can be set.
  • the duplexer according to the invention Since with the duplexer according to the invention, due to the greater distance between the frequency sub-regions, less steep edges also lead to the desired decoupling between the transmission and reception bands, the use of lithium niobate rot y with an intersection angle of 60-70 ° (LN60-70) and in particular is also in principle near 64 ° (LT64) possible. In this way, even lower insertion losses can be achieved compared to lithium tantalate. This can be particularly advantageous when using lithium niobate for the output filters, since the communication terminal in particular strives for a high transmission power, which in turn requires low insertion loss. With the transmission power remaining the same, lower insertion loss results in lower power consumption.
  • SAW filters for input and output filters which are constructed on different substrate materials.
  • the combination of lithium niobate for the outlet filter and lithium tantalate for the inlet filter is preferred.
  • the electrode material is preferably correspondingly stable. Electrodes that have the following material layers or a sandwich structure with the following material layer combinations are therefore particularly suitable: aluminum and copper layers, aluminum and magnesium layers or aluminum / copper and copper or magnesium layers.
  • the surface wave filters of the duplexer according to the invention are preferably designed as reactance filters, with which the required high insertion vaporization can be achieved particularly well with the output filter
  • Figure 1 shows the location and arrangement of the transmission and reception band.
  • Figure 2 shows a real filter curve
  • FIG. 3 shows the arrangement and position of partial frequency ranges according to the invention
  • Figures 4 to 6 own different levels of integration of a
  • Duplexers including peripherals.
  • FIG. 7 shows an exemplary interconnection of
  • FIG. 1 shows a schematic representation of the arrangement and position of the transmission band TX and reception band RX of the American CDMA 1900 system.
  • the transmission band TX extends from 1850 to 1910 MHz and is thus 60 MHz wide.
  • the reception band RX extends from 1930 to 1990 MHz and thus also has a width of 60 MHz.
  • a communication connection uses, for example, a transmission frequency fxT which lies in the transmission band TX and at the same time a reception frequency fxR in the reception band RX.
  • the distance between fxT and fxR is the so-called duplex distance DA and is 80 MHz for the CDMA system mentioned. All frequency pairs with a duplex distance of 80 MHz are suitable for a communication connection within this system.
  • FIG. 2 shows a schematic representation of a possible transmission curve of a filter with the required bandwidth shown below, here of the transmission band TX. EDF vaporization is particularly important for filter quality. This is the greatest distance from the dashed zero line for zero attenuation to the transmission curve within the corresponding band.
  • the pass band is also wider than the required frequency band of the respective band, because the edges of a filter are in the pass band
  • Input filter in the area of the reception band RX has a sufficiently low sensitivity or a sufficiently high blocking area suppression SU.
  • the left flank F 1 of the pass band, which delimits the reception band RX hm from the transmission band TX, would be decisive for a corresponding input filter.
  • FIG. 3 shows how, according to the invention, the transmission and reception ranges TX, RX e are split into two frequency subregions of here bandwidth.
  • a frequency sub-area RX1, RX2 of the receive band is assigned to a frequency sub-area TX1, TX2 of the transmission band in such a way that the duplex distance DA can be maintained.
  • a transmission frequency fXT with the required duplex spacing DA of 80 MHz, for example, is assigned a reception frequency fxR.
  • the filters belonging to the corresponding frequency sub-ranges have the corresponding frequency sub-ranges Passband on. Due to the higher band gap BA, however, filters with less steep flanks can be selected, which nevertheless achieve the required blocking area suppression SU of typically 50 dB.
  • FIG. 4 shows a schematic representation of a duplexer consisting of four partial filters FR1, FR2, FT1, FT2 together with its connection to an antenna A and the associated transmission path PA and the receiving deposit LNA.
  • Both the input filter and the output filter are designed as split surface wave filters with two sub-filters.
  • the input filter comprises the sub-filters FR1 and FR2, while the output filter comprises the sub-filters FT1 and FT2.
  • a switch S is arranged between the antenna A and the duplexer consisting of the four partial filters and can switch between two partial filter pairs FT1 / FR1 and FT2 / FR2.
  • a sub-titer pair each comprises a filter of input and output filters, for example the pair FRl / FTl or FR2 / FT2.
  • switches S ⁇ S , v - connect, for example, the components of the reception path LNA to the input filter, with switch S between the sub-filters of the input filter switches. Accordingly, the switch S switches between the various output filters FT1 and FT2, which are optionally connected to the components of the transmission path PA.
  • a module Ml is shown, on which the four sub-filters are integrated.
  • the matching network consisting for example of passive components such as resistors, capacitors and inductors or strip lines (not shown in the figure), is implemented outside the module, as are the switches S.
  • FIG. 5 shows a corresponding arrangement, in which, however, the adaptation network is additionally integrated in addition to the partial filters on an enlarged module M2.
  • a module M3 which is integrated even higher is shown in FIG. 6.
  • this module M3 also includes the adaptation network and the switches S.
  • FIG. 7 shows a schematic representation of a circuit arrangement for a reactance filter constructed from surface wave single-gate resonators.
  • Em SAW-Emtorresonator is built on a piezoelectric substrate 1 and comprises an interdital transducer IDT provided with two connections, which is arranged between two reflectors Ref.
  • IDT interdital transducer
  • a serial resonator for example RIS, forms an element of a reactance filter together with an adjacent parallel resonator R1P.
  • a reactance filter preferably consists of a plurality of basic elements connected in series, for example three basic elements as shown in the figure.
  • the resonators R2S and R1P and R2S and R2P form two further basic elements.
  • the resonance frequencies of the parallel and serial resonator are shifted relative to one another in such a way that the anti-resonance frequency of the serial resonator comes to lie exactly on the resonance frequency of the parallel resonator.
  • Filter em pass-through behavior with a pass band which has a particularly low emfu vaporization of, for example, 2 dB and less.
  • the exemplary embodiments are only examples of possible configurations of the invention. However, the invention is not limited to the exemplary embodiments and may include further variations, not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Transceivers (AREA)

Abstract

L'invention concerne un commutateur émission/réception d'un système de radiocommunication présentant une bande émission et une bande réception. Selon l'invention, on utilise comme filtre d'entrée et/ou de sortie un filtre à ondes acoustiques de surface fractionné qui est composé d'au moins deux filtres partiels qui couvrent des domaines fréquentiels partiels adjacents de la bande correspondante et se complètent pour former la totalité de la bande. Au moins deux paires de filtres partiels comprennent respectivement un filtre dans le filtre d'entrée et de sortie. Un commutateur permet de procéder à une commutation entre les deux paires ou plus. Pour une distance constante entre les signaux émission et les signaux réception du commutateur émission/réception, on peut créer une largeur de bande interdite plus grande entre la bande émission et la bande réception, notamment entre les domaines fréquentiels partiels, cette largeur de bande étant réalisable avec des filtres à ondes acoustiques de surface.
EP00993470A 1999-12-14 2000-12-06 Commutateur emission/reception ayant une separation emission/reception amelioree Withdrawn EP1238464A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19960299 1999-12-14
DE19960299A DE19960299A1 (de) 1999-12-14 1999-12-14 Duplexer mit verbesserter Sende-/Empfangsbandtrennung
PCT/DE2000/004344 WO2001045273A2 (fr) 1999-12-14 2000-12-06 Commutateur emission/reception ayant une separation emission/reception amelioree

Publications (1)

Publication Number Publication Date
EP1238464A2 true EP1238464A2 (fr) 2002-09-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00993470A Withdrawn EP1238464A2 (fr) 1999-12-14 2000-12-06 Commutateur emission/reception ayant une separation emission/reception amelioree

Country Status (8)

Country Link
US (1) US6861924B2 (fr)
EP (1) EP1238464A2 (fr)
JP (1) JP2003517239A (fr)
KR (1) KR20020059762A (fr)
CN (1) CN1411632A (fr)
CA (1) CA2392833A1 (fr)
DE (1) DE19960299A1 (fr)
WO (1) WO2001045273A2 (fr)

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Also Published As

Publication number Publication date
DE19960299A1 (de) 2001-06-21
WO2001045273A3 (fr) 2001-12-27
WO2001045273A2 (fr) 2001-06-21
US6861924B2 (en) 2005-03-01
JP2003517239A (ja) 2003-05-20
US20030076194A1 (en) 2003-04-24
CN1411632A (zh) 2003-04-16
CA2392833A1 (fr) 2001-06-21
KR20020059762A (ko) 2002-07-13

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