EP2178153A1 - Netzelement für ein Mehrband-Mobilkommunikationssystem - Google Patents

Netzelement für ein Mehrband-Mobilkommunikationssystem Download PDF

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Publication number
EP2178153A1
EP2178153A1 EP08290987A EP08290987A EP2178153A1 EP 2178153 A1 EP2178153 A1 EP 2178153A1 EP 08290987 A EP08290987 A EP 08290987A EP 08290987 A EP08290987 A EP 08290987A EP 2178153 A1 EP2178153 A1 EP 2178153A1
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EP
European Patent Office
Prior art keywords
port
filters
coupled
connection point
circulator
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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Withdrawn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
EP08290987A
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English (en)
French (fr)
Inventor
Andreas Pascht
Thomas Bitzer
Ralf Matz
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.)
Alcatel Lucent SAS
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Alcatel Lucent SAS
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Publication date
Application filed by Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Priority to EP08290987A priority Critical patent/EP2178153A1/de
Publication of EP2178153A1 publication Critical patent/EP2178153A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies

Definitions

  • the invention relates to a network element for a mobile communications system, to a method of multiplexing in a mobile communications system.
  • LTE Long Term Evolution
  • IEEE 802.16 IEEE 802.16
  • UMTS Universal Mobile Telecommunication System
  • HSDPA High Speed Downlink Access
  • the invention relates to a network element for a multiband mobile communications system, the network element comprising: a first set of transmission filters and a second set of reception filters, each filter having a stop band, a pass band around a carrier frequency, an input port, an output port, wherein each filter is designed for maximum reflection at the output port in the stop bands; a first set of quarter-wavelength transmission lines connecting the first set of transmission filters with a first connection point and a second set of quarter-wavelength transmission lines connecting the second set of reception filters with a second connection point.
  • the network element further comprises: a first circulator with a first, a second and a third port, wherein the first port is coupled to the first connection point, and the third port is coupled to a first termination; a second circulator with a forth, a fifth and a sixth port, wherein the forth port is coupled to the second port of the first circulator, and the fifth port coupled to an antenna; a third circulator with a seventh, an eight and a ninth port, wherein the seventh port is coupled to the sixth port of the second circulator, the eight port is coupled to the second connection point and the ninth port coupled to a second termination.
  • the term 'quarter wavelength' as expressed herein refers to the wavelength of the corresponding centre frequency of the filter.
  • the quarter wavelength is different for each filter and therefore the transmission lines have different lengths.
  • the embodiments allow the simultaneous transmission and reception of wireless signals in a mobile communications system, that can be applied for frequency division duplex (FDD) or to time division duplex (TDD) modes.
  • the band pass of each of the transmission and reception filters has a pass band around the center frequency of each band.
  • the output port of the filters in the pass band shows no reflection and in the stop band all the energy of the wave is reflected back.
  • several received and transmitted paths are connected in parallel to one broadband antenna, reducing the number of components in a multiplexer topology.
  • the arrangement shown in the network element 100 isolates the output ports of the filters and reduces the necessary amount of components.
  • the filters are designed for no reflection in the pass bands at the output ports, wherein the output ports of the filters are designed as short circuit connections in the stop bands, wherein the quarter-wavelength transmission lines are designed for transforming the short circuit connection into an open circuit connection at the first and the second connection point.
  • the mobile communication system is a Time Division Duplex or a Frequency Division Duplex system.
  • the invention relates to a network element for a time division duplex multiband mobile communications system, the network element comprising:
  • the filters are designed for no reflection in the pass bands at the output ports, wherein the output ports of the filters are designed as short connections in the stop bands, wherein the quarter-wavelength transmission line are designed for transforming the short connection in an open connection at the connection point.
  • the mobile communication system is a Time Division Duplex system.
  • the output impedances of all filters in the stop bands are open circuits with a phase of zero or short circuits with a phase of 180°.
  • the scattering parameter S 21 has a maximum magnitude in the pass bands and a minimum magnitude in the stop bands.
  • the scattering parameter S 22 has a minimum magnitude in the pass bands and a maximum magnitude in the stop bands.
  • the invention relates to a method for multiplexing in a network element of a multiband communications system, the method comprising:
  • the method for multiplexing further comprises:
  • the invention relates to a method for multiplexing in a network element of a time division duplex multiband mobile communications system, the method comprising:
  • the method further comprises:
  • the invention in another aspect, relates to a mobile communication system for multiplexing and demultiplexing, the mobile communication system being operable to perform in accordance with any one of the preceding embodiments.
  • Fig. 1 shows a network element 100 for a mobile communications system comprising a first set of transmission filters 101 and a second set of reception filters 102, each of the transmission and the reception filters having a stop band, a pass band around a center frequency, an input port, an output port. Each of the filters is designed for maximum reflection at the output port in the stop bands.
  • the network element 100 further comprises a first set of quarter wavelength transmission lines 103 for coupling the output ports of the transmission filters with a first connection point 104 and also for connecting the output ports of the set of reception filters with a second connection point 122.
  • the network element further comprises a first circulator 106 with a first port 107, a second port 108 and a third port 109.
  • the first port is coupled to the first connection point 104
  • the third port 109 is coupled to a first termination 110.
  • the network element 100 further comprises a second circulator 111 with the fourth port 112, a fifth port 113, and a sixth port 114.
  • the fourth port 112 is coupled to the second port 108 of the first circulator 106
  • the fifth port 113 is coupled to an antenna 115.
  • the network element 100 further comprises a third circulator 116 with a seventh port 117, an eighth port 118 and a ninth port 119.
  • the seventh port 117 is coupled to the sixth port 114 of the second circulator, the eighth port 118 is coupled to the second connection point 122 and the ninth port 119 is coupled to a second termination 120.
  • the second connection point 122 is coupled to a second set of quarter wavelength transmission lines 121 which are connected to the second set of reception filters 102.
  • the network element 100 represented in fig. 1 acts as a multiplexer that combines several frequency bands available for a mobile communication system in systems such as time-division duplex (TDD) and frequency-division duplex (FDD).
  • TDD time-division duplex
  • FDD frequency-division duplex
  • the multiplexer arrangement allows the simultaneous transmission and reception of wireless signals in a mobile communications system, that can be applied for frequency division duplex (FDD) or to time division duplex (TDD) modes.
  • FDD frequency division duplex
  • TDD time division duplex
  • the band pass of each of the transmission and reception filters has a pass band around the center frequency of each band.
  • the output port of the filters in the pass band shows no reflection and in the stop band all the energy of the wave is reflected back.
  • the output port of the filter are perceived in the stop band either as an open circuit, where the phase of the output reflection factor is 0, or as a short circuit, where the phase of the output reflection factor is 180 degrees.
  • the output ports of the filters may act as a short circuit in the stop band of the filter.
  • the quarter wavelength transmission lines transform the short circuit into an open connection at the connection points 104 and 122.
  • Fig. 2 shows an example of the connection principle of the quarter wavelength transmission lines between the filters and the connection points.
  • the network element 200 comprises four transmission filters 202-205 connected to a common connection point 206 that is further connected to an antenna not shown in the figure. In general, any number of filters could be connected in the described way.
  • the pass band of the first filter 202 is centered around the same carrier frequency.
  • the other filters 203-205 are operated in the stop bands and the output ports of these three filters 203-205 act as a short circuit connection.
  • the quarter wavelength transmission lines transform this short circuit connection to an open circuit connection at the connection point 206. Therefore, the transmitted signal from the first filter only sees open connections and the only path that it may take is the path leading to the antenna. As a result the different paths are decoupled from each other and there is no interference between them.
  • Fig. 3 shows a graphic with the transmission behavior of the four filters shown in figs. 1 and 2 in the four frequency bands.
  • the graphic 300 shows the four frequency bands 301-304 with the high decoupling between the different filter transmission curves. This allows the transmission and reception within the network element to operate with a very low mutual interference, due to the use of the quarter wavelength transmission lines and the arrangement of the circulators.
  • Fig. 4 shows a network element 400 comprising four filters 401-404, coupled to four circulators 405-408 and a common antenna 409 connected through a connection point 410.
  • the four filter 401-404 are also coupled to the connection point 410 via a set of quarter-wavelength transmission lines 411.
  • the network element 400 comprises an arrangement of transmission and reception paths that share the same set of filters and the antenna in the case of a time-division duplex operation, where the frequency bands for the transmission and the reception are the same.
  • the circulators 405-408 the transmit and the reception paths of each frequency band can be separated which allows to use only one filter per frequency band. This leads to half the number of required filters compared to the embodiment of figs. 1 and 2 .
  • Each filter of the set of filters 401-404 has the characteristics of stop band, a pass band around the carrier frequency of the transmitted or received signal, an input port that is coupled to the circulator, an output port that is connected to the connection point and the antenna and each filter is designed for a maximum reflection at the output port in the stop band.
  • the filters are designed for no reflection in their pass band at the output ports and the output ports of the filters are designed as short circuit connections in the stop bands.
  • the quarter wavelength transmission lines transform the short circuit connection at the output port of the filters into an open circuit connection at the connection point.
  • Fig. 5 shows a method 500 for multiplexing in a network element of a multiband communications system.
  • the method comprises: In a first step 501, filtering a first set of signals within a set of frequency bands through a first set of transmission filters, each filter having a stop band, a pass band around a carrier frequency, an input port, an output port, wherein each filter is designed for maximum reflection at the output port in the stop bands.
  • a second step 502 transforming the first set of filtered signals from the output ports of the transmission filters to a first connection point via a set of quarter-wavelength transmission lines.
  • a third step 503 transferring the first set of filtered signals from the first connection point to a first circulator with a first, a second and a third port, wherein the first port is coupled to the first connection point, and the third port is coupled to a first termination.
  • a fourth step 504 transferring the first set of filtered signals to an antenna through a second circulator with a forth, a fifth and a sixth port, wherein the forth port is coupled to the second port of the first circulator, and the fifth port coupled to the antenna.

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EP08290987A 2008-10-20 2008-10-20 Netzelement für ein Mehrband-Mobilkommunikationssystem Withdrawn EP2178153A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08290987A EP2178153A1 (de) 2008-10-20 2008-10-20 Netzelement für ein Mehrband-Mobilkommunikationssystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08290987A EP2178153A1 (de) 2008-10-20 2008-10-20 Netzelement für ein Mehrband-Mobilkommunikationssystem

Publications (1)

Publication Number Publication Date
EP2178153A1 true EP2178153A1 (de) 2010-04-21

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EP08290987A Withdrawn EP2178153A1 (de) 2008-10-20 2008-10-20 Netzelement für ein Mehrband-Mobilkommunikationssystem

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021254605A1 (en) * 2020-06-17 2021-12-23 Telefonaktiebolaget Lm Ericsson (Publ) Filter topology for improved matching

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB889468A (en) * 1959-03-21 1962-02-14 Telefunken Gmbh Improvements in or relating to microwave switching arrangements
US4449128A (en) * 1982-03-22 1984-05-15 Gte Products Corporation Radio frequency transmitter coupling circuit
EP0445028A1 (de) * 1990-02-28 1991-09-04 Dassault Aviation Kopplungsvorrichtung für mindestens zwei Sender und Empfänger mit einer gemeinsamen Antenne
JP2007274465A (ja) * 2006-03-31 2007-10-18 Nec Corp 無線装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB889468A (en) * 1959-03-21 1962-02-14 Telefunken Gmbh Improvements in or relating to microwave switching arrangements
US4449128A (en) * 1982-03-22 1984-05-15 Gte Products Corporation Radio frequency transmitter coupling circuit
EP0445028A1 (de) * 1990-02-28 1991-09-04 Dassault Aviation Kopplungsvorrichtung für mindestens zwei Sender und Empfänger mit einer gemeinsamen Antenne
JP2007274465A (ja) * 2006-03-31 2007-10-18 Nec Corp 無線装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
A.G.D. WATSON ET AL.: "Common-aerial working for V.H.F. communication", JOURNAL OF THE INSTITUTE OF ELECTRICAL ENGINNERS, vol. 94, 1947, pages 644 - 648, XP002510985 *
P. FOLDES ET AL.: "A waveguide quadruplexer system", IRE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 9, no. 4, July 1961 (1961-07-01), pages 297 - 306, XP002510984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021254605A1 (en) * 2020-06-17 2021-12-23 Telefonaktiebolaget Lm Ericsson (Publ) Filter topology for improved matching

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