WO2008020735A1 - Duplexeur diélectrique - Google Patents

Duplexeur diélectrique Download PDF

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Publication number
WO2008020735A1
WO2008020735A1 PCT/KR2007/003951 KR2007003951W WO2008020735A1 WO 2008020735 A1 WO2008020735 A1 WO 2008020735A1 KR 2007003951 W KR2007003951 W KR 2007003951W WO 2008020735 A1 WO2008020735 A1 WO 2008020735A1
Authority
WO
WIPO (PCT)
Prior art keywords
dielectric
duplexer
filter
waveguide type
dielectric duplexer
Prior art date
Application number
PCT/KR2007/003951
Other languages
English (en)
Inventor
Jong-Tae Baek
Jae-Shin Lee
Young-Soo Jang
Seong-Mun Jo
Mun-Seok Choi
Sung-Hoon Kim
Young-Hyeok Kim
Kie-Jin Lee
Jong-Chel Kim
Seung-Wan Kim
Original Assignee
Cij Corp.
Industry-University Cooperation Foundation Sogang University
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
Priority claimed from KR1020060077824A external-priority patent/KR100852487B1/ko
Priority claimed from KR1020060077825A external-priority patent/KR100866978B1/ko
Application filed by Cij Corp., Industry-University Cooperation Foundation Sogang University filed Critical Cij Corp.
Publication of WO2008020735A1 publication Critical patent/WO2008020735A1/fr

Links

Classifications

    • 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
    • H01P1/2138—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using hollow waveguide filters

Definitions

  • the present invention relates to a dielectric duplexer, and more particularly, to a dielectric duplexer adopting a waveguide type dielectric filter.
  • a communication device uses a duplexer, in which a receiver filter and a transmission filter are combined, as a transmission unit and a receiver unit.
  • the duplexer is a device including the receiver filter that passes required signals among signals input from an antenna and the transmission filter that passes the signals that are to be transmitted to the antenna.
  • Duplexers widely used in mobile communication devices can be classified as high power duplexers and low power duplexers in the view of the electric power of the signals.
  • Metal cavity duplexers using metal cavity waveguides are mainly used as the high power duplexers, and dielectric duplexers and surface acoustic wave (SAW) duplexers are mainly used as the low power duplexers.
  • SAW surface acoustic wave
  • a metal cavity duplexer can transmit and receive the high power signals, has a low insertion loss in a transmission band and a receipt band, and has a high attenuation property in a stopband.
  • the metal cavity duplexer is mainly used in communication devices for high electric power of tens of ⁇ hundreds of watts (W) due to the large size thereof.
  • FIG. 1A is a perspective view of a conventional dielectric duplexer 10
  • FIG. 1 B is a cross-sectional view of the dielectric duplexer taken along line 1 B-1 B of FIG. 1A.
  • a plurality of resonators finely formed in a ceramic block 12 are coupled to each other in parallel by capacitors formed between electrode patterns 16 that are formed on an upper surface of the ceramic block 12 to form a desired duplexer.
  • Reference numeral 16 denotes an upper electrode pattern
  • reference numeral 17 is a radiator connected to an antenna
  • reference numerals 18 and 18' denote terminals connected to a transmission circuit and a receipt circuit.
  • the ceramic block 12, in which a plurality of i resonating holes 14 are formed, is coated by a metal electrode film 20 in order to reduce a radiation loss.
  • the conventional duplexer 10 in which the resonators are coupled in parallel, is called an integral duplexer, and uses a transverse electromagnetic mode (TEM), that is, a mode in which electromagnetic waves that are electric and magnetic transverse waves propagate (called a TEM duplexer).
  • TEM transverse electromagnetic mode
  • the conventional dielectric duplexer 10 can reduce the size of elements greatly to be smaller than those which use the metal cavity duplexer.
  • the resonators are coupled by the capacitance (electric capacity) formed between the upper electrode patterns 16 on the upper surface of the integral dielectric duplexer, and thus, if the a high electric power is applied, a dielectric breakdown of the capacitor occurs because of a short distance between the upper electrode patterns 16, and then, a power handling capacity of the conventional dielectric duplexer is degraded. Therefore, the conventional dielectric duplexer is mainly used in communication devices which run on a few watts or lower. Therefore, a dielectric duplexer that can be used in the communication device for high electric power is required.
  • FIG. 1 A is a perspective view of a conventional dielectric duplexer
  • FIG. 1 B is a cross-sectional view of the conventional dielectric duplexer taken along line 1 B-1 B of FIG. 1 A;
  • FIG. 2 is a schematic perspective view of a duplexer according to an embodiment of the present invention.
  • FIG. 3 is a plan view of a modified example of a signal feed portion in the duplexer of FIG. 2; and FIG. 4 is a schematic perspective view of a duplexer according to another embodiment of the present invention.
  • signal feed portionsignal feed portion 150, 250 receiver filter
  • signal feed portion connection terminal of transmission filter 171 power supplysignal feed portion connection terminal of receiver filter 112, 112a: transmission circuit connection terminal 152, 152a: receipt circuit connection terminal 225, 265; opening or window
  • the present invention provides a transverse electric (TE) mode dielectric duplexer having elements that are much smaller than elements of a metal cavity duplexer and can be used in a communication device for high electric power of a few W to hundreds of W.
  • TE transverse electric
  • a dielectric duplexer including: a waveguide type dielectric filter for transmitting and a waveguide type dielectric filter for receiving that are arranged in parallel with each other and are spatially separated from each other; and a signal feed portion for electrically connecting end portions of the waveguide type dielectric filters which has a variance of impedance.
  • the waveguide type dielectric filters may be transverse electric (TE) mode waveguides.
  • the dielectric filters may use rectangular waveguide resonators, and the rectangular waveguide resonator may include a plurality of dielectric resonators that are defined by slots or windows.
  • the signal feed portion may be formed of a coaxial connector or a conductive microstrip line that is formed on a substrate, on which the dielectric filters are arranged.
  • a transmission filter and a receiver filter formed of a waveguide type dielectric filter are connected by a signal feed portion using a transmission line having a variance of impedance, and thus, a duplexer having an improved dielectric strength and a high isolation property to be applied in a communication device for electric power can be provided.
  • the rectangular waveguide type dielectric duplexer of the present invention is smaller than a conventional duplexer using a rectangular metal cavity waveguide, and thus, can be used in a small size communication device.
  • Embodiments of the present invention provide a duplexer using a waveguide type dielectric filter instead of using a conventional TEM resonator having resonating holes.
  • the duplexer of the present invention is fabricated by having two waveguide type dielectric filters that use TE modes electrically connected using different impedances.
  • FIG. 2 is a schematic perspective view of a duplexer 100 according to an embodiment of the present invention.
  • FIG. 3 is a plan view of a modified example of a signal feed portion of the duplexer 100.
  • the duplexer 100 of the current embodiment includes a waveguide type dielectric filter for transmitting (hereinafter, a transmission filter) 110, a waveguide type dielectric filter for receiving (hereinafter, a receiver filter) 150, and a signal feed portion 132 electrically connecting the transmission filter 110 and the receiver filter 150 on a substrate 102, for example, a printed circuit board (PCB).
  • the transmission filter 110 and the receiver filter 150 use different frequencies from each other.
  • the transmission filter 110 and the receiver filter 150 must be spatially separated from each other. Despite this, the transmission filter 110 and the receiver filter 150 are connected to each other so as to occupy a minimum space.
  • the transmission filter 110 and the receiver filter 150 are connected to each other in serial by the power supply signal feed portion 132, a length of the duplexer 100 becomes too long. Accordingly, the duplexer 100 may be damaged during fabrication, and may have a weak mechanical strength after fabrication. In addition, if the duplexer 100 is long, it is difficult to mount the duplexer 100 on a communication device. Therefore, the transmission filter 110 and the receiver filter 150 may be connected in parallel with each other by the power supply signal feed portionportion 132.
  • the transmission filter 110 can use a rectangular waveguide type dielectric filter including slots (or vertical recesses 125) and operates in the TE mode.
  • the dielectric filter disclosed in Korean Laid-open Patent No. 2003-0007057 and No. 2005-17040 can be used as the waveguide type dielectric filter.
  • the transmission filter 110 includes a plurality of TE mode dielectric resonators 120 that are separated by the slots 125.
  • Each of the resonators 120 can further include a metal film 118 surrounding a dielectric material 116 in order to increase a handling electric power.
  • Transmission circuit connection terminals 132 and 112 formed of a conductive material can be formed extending from end surfaces of the resonators 120 located between an end and the other end of the transmission filter 110.
  • the connection terminal 112 is externally electrically connected, for example, an input terminal 132 inputting signals to an antenna and an output terminal 114 outputting the signals.
  • the frequency to be resonated can be determined by controlling a size of the resonator 120.
  • the receiver filter 150 basically has the similar structure to the transmission filter 110. That is, the receiver filter 150 includes a plurality of rectangular waveguide type dielectric resonators 160 defined by slots 165 and a receipt circuit connection terminal 152. However, since the receiver filter 150 handles a frequency band that is different from that of the transmission filter 110, the size of the dielectric resonators 160 may be different from that of the dielectric resonator 120 of the transmission filter 110.
  • a metal film is plated on a surface of the dielectric, and thus, there is no dielectric breakdown even when the high electric power are applied, and the electric power handling property can be improved.
  • a distance between the upper electrode patterns (16 of FIG. 1) is short, and thus, dielectric breakdown occurs when high electric power are applied, making it is difficult to handle the high amounts of electric power.
  • the signal feed portion 132 connects an output terminal 170 of the transmission filter 110 to an input terminal 171 of the receiver filter 150.
  • a transmission line of the transmission filter and a transmission line of the receiver filter connecting to the signal feed portion 132 emust have different impedances from each other.
  • Connection portions of the filters should have different impedances from each other so that the signal received through the antenna is transmitted to the receiver filter 150 without being input into the transmission filter 110, and the different impedances can be realized in various ways.
  • lengths of connectors can be differentiated, or lengths of feed lines of the PCB substrate can be differentiated.
  • a capacitor can be connected to a side of the connector or the lines.
  • structures of the transmission filter 110 and the receiver filter 150 are the same as those of FIG. 2.
  • the transmission circuit connection terminal 112 and the receipt circuit connection terminal 152 in FIG. 2 are replaced with coaxial connector type terminals 112a and 152a, and an antenna connecting terminal 144 and three external circuit connection terminals of the signal feed portion 140 are formed as the coaxial connectors.
  • the coaxial connector 142 is used, the size of element increases. However, the external portion of the connector 142 is covered by the conductive material, and thus, a transmission loss is smaller than that of the connection terminal formed as a microstrip line shown in FIG. 2.
  • FIG. 4 is a schematic plan view of a duplexer 200 according to another embodiment of the present invention.
  • the duplexer 200 of the current embodiment includes a waveguide type dielectric filter for transmitting (hereinafter, a transmission filter) 210, a waveguide type dielectric filter for receiving (hereinafter, a receiver filter) 250, and a signal feed portion 132 electrically connecting the transmission filter 110 and the receiver filter 150 on a substrate 102, for example, a printed circuit board (PCB).
  • the transmission filter 210 and the receiver filter 250 use different frequencies from each other. As described above with reference to FIG. 2, the transmission filter 210 and the receiver filter 250 are spatially separated from each other.
  • the transmission filter 210 includes a plurality of TE mode dielectric resonators 220 separated by openings or windows 225.
  • a metal layer 218 surrounds a dielectric material 216, and the resonator 220 is formed as a square waveguide shape.
  • Electrodes for a transmission circuit connection terminal 112 and a radiator connection terminal 170 are formed on ends of the resonators 220 located between an end and the other end of the transmission filter 210.
  • the frequency to be resonated can be determined by controlling a size of the resonators 220.
  • the receiver filter 250 basically has the similar structure to that of the transmission filter 210. That is, the receiver filter 250 includes a plurality of resonators 260 defined by openings or windows 265, an antenna connection electrode 171 , and a receipt circuit connection terminal 152. However, since the receiver filter 250 handles the different frequency from that of the transmission filter 210, the size of the resonator 260 can be different from that of the resonator 220 in the transmission filter 210.
  • an electrode film is plated on the surface of the dielectric material, and thus, an electric power handling property can be improved.
  • a distance between the upper electrode patterns (16 of FIG. 1) is short, and thus, the dielectric breakdown may occur when high amounts of electric power are applied, thus making it difficult to be used for the high amounts of electric power.
  • the signal feed portion 132 connects an output terminal 170 of the transmission filter 210 to an input terminal 171 of the receiver filter 250.
  • a housing 230 covers both of the transmission filter 210 and the receiver filter 250, and is placed on the wired line 132 formed on the substrate 102.
  • Table 1 shows comparison results between the duplexer according to the first embodiment of the present invention and the conventional metal cavity duplexer.
  • the duplexer of the present invention can obtain equivalent properties to those of the conventional metal cavity duplexer in view of the central frequency, bandwidth, insertion loss, degree of attenuation, and the like by controlling a size and a shape of the waveguide type dielectric filter, while reducing a volume to 74cm 2 that is a quarter of the volume of the conventional metal cavity duplexer, that is, 286cm 2 .
  • the dielectric duplexer of the present invention is not limited to the volume of Table 1 , and the volume can be further reduced by changing the dielectric material or the structure of the duplexer.

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Abstract

Duplexeur diélectrique de taille réduite utilisable dans un dispositif de communications pour des quantités de puissance électrique élevées allant de quelques W à des centaines de W. Le duplexeur comprend: un filtre diélectrique de type guide d'ondes pour la transmission et un filtre diélectrique de type guide d'ondes pour la réception, en parallèle, et spatialement séparés, et un étage d'injection de signal pour la connexion électrique de parties terminales des deux filtres, ayant une variance d'impédance.
PCT/KR2007/003951 2006-08-17 2007-08-17 Duplexeur diélectrique WO2008020735A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020060077824A KR100852487B1 (ko) 2006-08-17 2006-08-17 유전체 듀플렉서
KR10-2006-0077825 2006-08-17
KR1020060077825A KR100866978B1 (ko) 2006-08-17 2006-08-17 Ｔｅ 모드 유전체 듀플렉서
KR10-2006-0077824 2006-08-17

Publications (1)

Publication Number Publication Date
WO2008020735A1 true WO2008020735A1 (fr) 2008-02-21

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ID=39082237

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/003951 WO2008020735A1 (fr) 2006-08-17 2007-08-17 Duplexeur diélectrique

Country Status (1)

Country Link
WO (1) WO2008020735A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709659A (zh) * 2012-06-19 2012-10-03 成都赛纳赛德科技有限公司 一种矩形波导阻抗变换器
CN113258230A (zh) * 2020-06-24 2021-08-13 中兴通讯股份有限公司 介质滤波器合路单元和介质多工器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6281764B1 (en) * 1996-06-10 2001-08-28 Murata Manufacturing Co., Ltd. Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof
EP1278264A1 (fr) * 2001-07-17 2003-01-22 Toko, Inc. Filtre à guide d' onde diélectrique et sa structure de support
US20050219010A1 (en) * 2004-03-30 2005-10-06 Tdk Corporation Signal separating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6281764B1 (en) * 1996-06-10 2001-08-28 Murata Manufacturing Co., Ltd. Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof
EP1278264A1 (fr) * 2001-07-17 2003-01-22 Toko, Inc. Filtre à guide d' onde diélectrique et sa structure de support
US20050219010A1 (en) * 2004-03-30 2005-10-06 Tdk Corporation Signal separating device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RIZZI P.A.: "Microwave Engineering Passive Circuits", 1988, PRENTICE-HALL, ISBN: 0-13-586702-9 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709659A (zh) * 2012-06-19 2012-10-03 成都赛纳赛德科技有限公司 一种矩形波导阻抗变换器
CN113258230A (zh) * 2020-06-24 2021-08-13 中兴通讯股份有限公司 介质滤波器合路单元和介质多工器
CN113258230B (zh) * 2020-06-24 2022-04-01 中兴通讯股份有限公司 介质滤波器合路单元和介质多工器

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