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WO2001011710A1 - Filtre ceramique dielectrique a couplage capacitif eleve - Google Patents

Filtre ceramique dielectrique a couplage capacitif eleve Download PDF

Info

Publication number
WO2001011710A1
WO2001011710A1 PCT/IB2000/001234 IB0001234W WO0111710A1 WO 2001011710 A1 WO2001011710 A1 WO 2001011710A1 IB 0001234 W IB0001234 W IB 0001234W WO 0111710 A1 WO0111710 A1 WO 0111710A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
transmission line
holes
hole
transmission
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.)
Ceased
Application number
PCT/IB2000/001234
Other languages
English (en)
Inventor
Masahiko Kitajima
Kosuke Nishimura
Hiroshi Nakamura
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.)
Ube Electronics Ltd
Original Assignee
Ube Electronics Ltd
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 Ube Electronics Ltd filed Critical Ube Electronics Ltd
Priority to KR1020017004427A priority Critical patent/KR20010088856A/ko
Priority to BR0007032-7A priority patent/BR0007032A/pt
Publication of WO2001011710A1 publication Critical patent/WO2001011710A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • 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
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block

Definitions

  • This invention relates to ceramic block filters with high performance in a small package.
  • the invention relates to an improved design for dielectric ceramic filters which
  • a ceramic body with a coaxial hole bored through its length forms a resonator that
  • the holes are typically circular, or elliptical.
  • multiple resonators may form a dielectric ceramic filter.
  • the holes in a filter must pass through
  • the axial length of a filter is the exact same length as the axial length of a filter.
  • the axial length of a filter is selected based
  • the ceramic block functions as a filter because the resonators are inductively coupled
  • A-D a ceramic block 101 is shown with two holes 103 and 105. All surfaces, except for the
  • the two holes 103 and 105 are inductively and capacitively coupled to each other.
  • block 101 will not perform as a
  • a pattern of conductive material is printed on face 107, as shown in
  • the capacitive coupling can be regulated in Figure 5B by adjusting parameters L and G.
  • Ceramic filters are well known in the art and are generally described for example in U.S.
  • Patent Nos. 4.896.124 hereby incorporated by reference as if fully set forth herein.
  • a dielectric ceramic filter are sharpened as the number of holes bored in the ceramic block are
  • Solid line graph 21 represents the response of a filter without a high end trap.
  • Dashed line graph 23 represents the response of the same filter
  • Trap holes, or traps as they are commonly referred to are resonators which resonate at a
  • the holes transmit an input signal
  • Some dielectric ceramic filters are designed for high capacitance between the input
  • transmission line 32 is designed very close to transmission line 32. Furthermore, transmission line 32 is designed with a very complicated inter-digital pattern as shown in Figure 3.
  • the present invention relates to a dielectric ceramic filter which enables high
  • transmission line forms a semi-circle around the hole of the transmission pole which encircles
  • the hole of the transmission pole has a large
  • Figure 1 illustrates the increased sharpness of the band pass response of a dielectric
  • Figure 2 illustrates the effectiveness of traps in removing high end frequencies.
  • Figure 3 illustrates one conventional interaction in a high capacitance ceramic filter
  • Figure 4 illustrates one embodiment of the filter design of the present invention.
  • Figure 5 A illustrates the open face surface of a ceramic block plated with silver on all
  • Figure 5B illustrates the ceramic block of Figure 5A, but with a printed pattern on the
  • Figure 5C illustrates the ceramic filter of Figure 5B with a second printed pattern.
  • Figure 5D illustrates the ceramic filter of Figure 5C with a third printed pattern.
  • FIG. 4 a new design for the top surface of a dielectric ceramic filter is shown in accordance with the present invention which enables high capacitance interaction between the transmission line 42 from input/output pad 43 and the hole of the transmission pole
  • the electrode pattern 41 does not fully encircle the hole
  • the transmission pole is kept a distance of 0.05 mm to 0.5 mm from the
  • transmission line 42 Rather, transmission line 42 interacts with the hole of the transmission pole
  • the hole 44 is also kept a distance of 0.05 mm to 0.5 mm from the transmission line 42.
  • the conductive material plating the inner walls of the hole is connected to the electrode pattern 41.
  • transmission pole has a large electric intensity thus providing large capacitance coupling without
  • productivity for the filter of the present invention is greater than heretofore possible for a
  • the line is designed to encircle from
  • the choice of dielectric is one of design.
  • the dielectric is ceramic and has an
  • conductive material on the dielectric As stated above, copper or silver are usually the
  • the conductive material generally covers the substantially all of the bottom and sidewalls of the ceramic block. This is accomplished by one of several known
  • Filters made in accordance with the present invention may be simplex (a single filter) or
  • duplexer the combination of two filters such as a transmitter filter and a receiver filter.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

Selon l'invention, un nouveau filtre céramique diélectrique permet une interaction à capacité élevée entre une ligne de transmission et un réseau d'électrodes disposé autour d'un pôle de transmission du filtre. Dans un mode de réalisation préféré, la ligne de transmission forme un demi-cercle autour du pôle de transmission, qui entoure de 1/8 à 3/4 dudit pôle de transmission. Le pôle de transmission a une intensité électrique élevée qui permet un couplage à capacité élevée et ne nécessite pas de trop rapprocher la ligne de transmission du pôle, auquel cas apparaît un risque de court-circuit.
PCT/IB2000/001234 1999-08-06 2000-08-03 Filtre ceramique dielectrique a couplage capacitif eleve Ceased WO2001011710A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020017004427A KR20010088856A (ko) 1999-08-06 2000-08-03 대용량성 결합을 가진 유전체 세라믹 필터
BR0007032-7A BR0007032A (pt) 1999-08-06 2000-08-03 Filtro dielétrico de cerâmica com acoplamento capacitivo grande

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14767599P 1999-08-06 1999-08-06
US60/147,675 1999-08-06
US61266500A 2000-07-10 2000-07-10
US09/612,665 2000-07-10

Publications (1)

Publication Number Publication Date
WO2001011710A1 true WO2001011710A1 (fr) 2001-02-15

Family

ID=26845122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/001234 Ceased WO2001011710A1 (fr) 1999-08-06 2000-08-03 Filtre ceramique dielectrique a couplage capacitif eleve

Country Status (2)

Country Link
KR (1) KR20010088856A (fr)
WO (1) WO2001011710A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2382234A (en) * 2001-03-15 2003-05-21 Murata Manufacturing Co Dielectric filter, dielectric duplexer, and communication apparatus using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673902A (en) * 1983-11-25 1987-06-16 Murata Manufacturing Co., Ltd. Dielectric material coaxial resonator filter directly mountable on a circuit board
EP0367061A2 (fr) * 1988-10-31 1990-05-09 Motorola, Inc. Filtre céramique comportant un circuit déphaseur intégré
GB2271471A (en) * 1992-09-21 1994-04-13 Motorola Inc Dielectric filter having resonators of trapezoidal cross-section
WO1997002618A1 (fr) * 1995-06-30 1997-01-23 Motorola Inc. Filtre de bloc ceramique a multifrequence avec resonateurs places dans des plans differents

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673902A (en) * 1983-11-25 1987-06-16 Murata Manufacturing Co., Ltd. Dielectric material coaxial resonator filter directly mountable on a circuit board
EP0367061A2 (fr) * 1988-10-31 1990-05-09 Motorola, Inc. Filtre céramique comportant un circuit déphaseur intégré
GB2271471A (en) * 1992-09-21 1994-04-13 Motorola Inc Dielectric filter having resonators of trapezoidal cross-section
WO1997002618A1 (fr) * 1995-06-30 1997-01-23 Motorola Inc. Filtre de bloc ceramique a multifrequence avec resonateurs places dans des plans differents

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2382234A (en) * 2001-03-15 2003-05-21 Murata Manufacturing Co Dielectric filter, dielectric duplexer, and communication apparatus using the same
GB2382234B (en) * 2001-03-15 2003-12-31 Murata Manufacturing Co Dielectric filter, dielectric duplexer, and communication apparatus using the same

Also Published As

Publication number Publication date
KR20010088856A (ko) 2001-09-28

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