US20030141948A1
Expired / Lapsed
US
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Dielectric filter, antenna duplexer
Assignee: Panasonic Holdings Corp
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Filing: 2002-02-26
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Granted: —
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Expires: 2022-02-26
Abstract
Abstract A dielectric filter includes resonator electrodes, an inter-stage coupling capacitor electrode, and an input/output coupling capacitor electrode on dielectric substrates, respectively. The resonator electrodes are electro-magnetically coupled to each other to form a tri-plate structure, are made of a metallic foil embedded in a resonator dielectric substrate. Another dielectric filter includes an upper shield electrode dielectric substrate, an inter-stage coupling capacitor dielectric substrate, a resonator dielectric substrate, and an input/output coupling capacitor dielectric substrate which are made of a composite dielectric material including a high-dielectric-constant material and a low-dielectric-constant material. The above described arrangement provides the dielectric filter with an improved Q factor of a resonator, a low loss, and a high attenuation.
Inventors
- 👤 Tomoya Maekawa
- 👤 Yasuhiro Sugaya
- 👤 Toru Yamada
- 👤 Toshio Ishizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:21
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345; H01P1/213; H01P1/2135; H01P11/00; H01P11/007
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
62 words
1 . A dielectric filter comprising: resonator electrodes made of metallic foil, electro-magnetically coupled with each other; an inter-stage coupling capacitor electrode for coupling the resonator electrodes; an input/output coupling capacitor electrode for inputting and outputting a signal to the resonator electrodes; and dielectric substrates having the resonator electrodes, the inter-stage coupling capacitor electrode, and the input/output coupling capacitor electrode provided thereon.
Claim 2
Dependent Claim
62 words
1 . A dielectric filter comprising: resonator electrodes made of metallic foil, electro-magnetically coupled with each other; an inter-stage coupling capacitor electrode for coupling the resonator electrodes; an input/output coupling capacitor electrode for inputting and outputting a signal to the resonator electrodes; and dielectric substrates having the resonator electrodes, the inter-stage coupling capacitor electrode, and the input/output coupling capacitor electrode provided thereon.
Claim 3
Dependent Claim
55 words
2 . A dielectric filter according to claim 1 , wherein a first dielectric substrate of the dielectric substrates having the resonator electrodes provided thereon has a lower dielectric constant than a second dielectric substrate of the dielectric substrates, and wherein the resonator electrodes has at least one surface contacting with the second dielectric substrate.
Claim 4
Dependent Claim
24 words
3 . A dielectric filter according to claim 2 , wherein each of the resonator electrodes has a side contacting the first dielectric substrate.
Claim 5
Dependent Claim
30 words
4 . A dielectric filter according to claim 1 , wherein each of the resonator electrodes has a short-circuit end at one end and an open end at other end.
Claim 6
Dependent Claim
25 words
5 . A dielectric filter according to claim 4 , wherein each of the resonator electrodes has a wide portion at the open end thereof.
Claim 7
Dependent Claim
22 words
6 . A dielectric filter according to claim 1 , wherein each of the resonator electrodes has open ends at both ends.
Claim 8
Dependent Claim
30 words
7 . A dielectric filter according to claim 6 , wherein each of the resonator electrodes has a wide portion provided at at least one of the open ends thereof.
Claim 9
Dependent Claim
23 words
8 . A dielectric filter according to claim 1 , wherein the metallic foil contains at least one of gold, silver, and copper.
Claim 10
Dependent Claim
30 words
9 . A dielectric filter according to claim 1 , wherein each of the resonator electrodes has a cross section having four-sided shape with corners being rounded shaped in arcuate.
Claim 11
Dependent Claim
24 words
10 . A dielectric filter according to claim 1 , wherein the resonator electrodes have respective thicknesses ranging from 10 μm to 400 μm.
Claim 12
Dependent Claim
22 words
11 . A dielectric filter according to claim 1 , wherein the resonator electrodes have respective surfaces thereof polished or metal plated.
Claim 13
Dependent Claim
26 words
12 . A dielectric filter according to claim 1 , wherein the resonator electrodes have respective average surface roughnesses ranging from 0.5 μm to 0.01 μm.
Claim 14
Dependent Claim
54 words
13 . A method of manufacturing a dielectric filter, comprising the steps of: providing resonator electrodes of metallic foil; embedding the resonator electrodes in a dielectric substrate to form a resonator dielectric substrate; and laminating the resonator dielectric substrate with another dielectric substrate having an conductive layer thereon to form a laminated dielectric substrate.
Claim 15
Dependent Claim
54 words
13 . A method of manufacturing a dielectric filter, comprising the steps of: providing resonator electrodes of metallic foil; embedding the resonator electrodes in a dielectric substrate to form a resonator dielectric substrate; and laminating the resonator dielectric substrate with another dielectric substrate having an conductive layer thereon to form a laminated dielectric substrate.
Claim 16
Dependent Claim
22 words
14 . A method according to claim 13 , wherein the metallic foil contains at least one of gold, silver, and copper.
Claim 17
Dependent Claim
68 words
15 . A method according to claim 13 , wherein said step of providing the resonator electrodes includes the sub-steps of: providing the metallic foil with a photo mask on both surfaces thereof; etching the metallic foil through the photo mask; and forming an electrode frame through processing the etched metallic foil to have an edge being rounded or being shaped in arcuate by chemical or electrolytic polishing.
Claim 18
Dependent Claim
35 words
16 . A method according to claim 13 , wherein said step of providing the resonator electrodes includes the sub-step of: embedding the resonator electrodes in a resonator ceramic dielectric substrate in green sheet form.
Claim 19
Dependent Claim
97 words
17 . A method according to claim 13 , wherein said step of forming the laminated dielectric substrate includes the sub-steps of: laminating a resonator ceramic dielectric substrate in green sheet form having the resonator electrodes embedded therein between a ceramic dielectric substrate in green sheet form having a conductive layer thereon and a shield electrode ceramic dielectric substrate in green sheet form; and firing the laminated resonator ceramic dielectric substrate in green sheet form, the laminated ceramic dielectric substrate in green sheet form, and the laminated shield electrode ceramic dielectric substrate in the green sheet form.
Claim 20
Dependent Claim
54 words
18 . A method according to claim 13 , wherein said step of forming the dielectric substrate includes the sub-steps of: laminating a resonator ceramic dielectric substrate in green sheet form having the resonator electrodes embedded therein between fired ceramic dielectric substrates; and firing the laminated resonator ceramic dielectric substrate in green sheet form.
Claim 21
Dependent Claim
39 words
19 . A method according to claim 13 , wherein said step of providing the resonator electrodes includes the sub-steps of: embedding the resonator electrodes in a resin substrate containing thermoset resin; and curing the resin substrate by heating.
Claim 22
Dependent Claim
20 words
20 . A method according to claim 19 , wherein the resin substrate is a composite substrate containing inorganic filler.
Claim 23
Dependent Claim
33 words
21 . A method according to claim 19 , wherein said step of forming the laminated dielectric substrate includes the sub-step of: laminating the resin substrate and a shield electrode ceramic dielectric substrate.
Claim 24
Dependent Claim
41 words
22 . An antenna duplexer comprising: an antenna port; a first filter including the dielectric filter according to any one of claims 1 to 12 , being coupled to the antenna port; and a second filter coupled to the antenna port.
Claim 25
Dependent Claim
36 words
23 . An antenna duplexer comprising: an antenna port; and first and second filters, each including the dielectric filter according to any one of claims 1 to 12 , each being coupled to the antenna port.
Claim 26
Dependent Claim
46 words
24 . An antenna duplexer comprising: an antenna port; a first transmitter filter including the dielectric filter manufactured by the method according to any one of claims 13 to 21 , being coupled to the antenna port; and a second filter coupled to the antenna port.
Claim 27
Dependent Claim
38 words
25 . An antenna duplexer comprising: an antenna port; first and second filters, each including the dielectric filter manufactured by the method according to any one of claims 13 to 21 , each coupled to the antenna port.
Claim 28
Dependent Claim
19 words
26 . A communication apparatus comprising the antenna duplexer according to any one of claims 22 to 25 .
Claim 29
Dependent Claim
88 words
27 . A dielectric filter comprising: first, second, and third dielectric substrates laminated together, at least one of the first, second, and third dielectric substrates includes a portion thereof having a different relative dielectric constant from other portion thereof; resonator electrodes on the first dielectric substrate, being electro-magnetically coupled with each other; an inter-stage coupling capacitor electrode on the second dielectric substrate for coupling the resonator electrodes; and an input/output coupling capacitor electrode on the third dielectric substrate for inputting and outputting a signal to the resonator electrodes.
Claim 30
Dependent Claim
88 words
27 . A dielectric filter comprising: first, second, and third dielectric substrates laminated together, at least one of the first, second, and third dielectric substrates includes a portion thereof having a different relative dielectric constant from other portion thereof; resonator electrodes on the first dielectric substrate, being electro-magnetically coupled with each other; an inter-stage coupling capacitor electrode on the second dielectric substrate for coupling the resonator electrodes; and an input/output coupling capacitor electrode on the third dielectric substrate for inputting and outputting a signal to the resonator electrodes.
Claim 31
Dependent Claim
30 words
28 . A dielectric filter according to claim 27 , wherein each of the resonator electrodes has a short-circuit end at one end and an open end at other end.
Claim 32
Dependent Claim
25 words
29 . A dielectric filter according to claim 28 , wherein each of the resonator electrodes has a wide portion at the open end thereof.
Claim 33
Dependent Claim
23 words
30 . A dielectric filter according to claim 27 , wherein each of the resonator electrodes has open ends at both ends thereof.
Claim 34
Dependent Claim
29 words
31 . A dielectric filter according to claim 30 , wherein each of the resonator electrodes has a wide portion at at least one of the open ends thereof.
Claim 35
Dependent Claim
47 words
32 . A dielectric filter according to claim 27 , wherein at least one of the resonator electrodes, the inter-stage coupling capacitor electrode, and the input/output coupling capacitor electrode is formed with a printed pattern of conductive paste containing at least one of gold, silver, and copper.
Claim 36
Dependent Claim
44 words
33 . A dielectric filter according to claim 27 , wherein at least one of the resonator electrodes, the inter-stage coupling capacitor electrode, and the input/output coupling capacitor electrode is formed with a metallic foil containing at least one of gold, silver, and copper.
Claim 37
Dependent Claim
60 words
34 . A dielectric filter according to claim 27 , wherein each of the first and second dielectric substrates includes: a first dielectric portion located at a center of each of the resonator electrodes; and a second dielectric portion located at both sides of each of the resonator electrodes, having a lower relative dielectric constant than the first dielectric portion.
Claim 38
Dependent Claim
57 words
35 . A dielectric filter according to claim 34 , wherein the inter-stage coupling capacitor electrode is located at the second dielectric portion of the second dielectric substrate, wherein the third dielectric substrate includes the second dielectric region, and wherein the input/output coupling capacitor electrode is located at the second dielectric portion of the third dielectric substrate.
Claim 39
Dependent Claim
51 words
36 . A dielectric filter according to claim 34 , wherein the first dielectric portion is made of ceramic material of one of Bi—Ca—Nb—O base, Ba—Ti—O base, and Zr(Mg, Zn, Nb)Ti—Mn—O base, and wherein the second dielectric portion is made of ceramic material of one of forsterite and alumina borosilicate glass.
Claim 40
Dependent Claim
104 words
37 . A method of manufacturing a dielectric filter comprising the steps of: providing a composite dielectric block through laminating a first dielectric material and a second dielectric material having a lower dielectric constant than the first dielectric material; providing composite dielectric substrates through slicing the composite dielectric block in parallel with a direction of laminating the first and second dielectric materials; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the composite dielectric substrates, respectively; and laminating the composite dielectric substrates having the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode thereon.
Claim 41
Dependent Claim
104 words
37 . A method of manufacturing a dielectric filter comprising the steps of: providing a composite dielectric block through laminating a first dielectric material and a second dielectric material having a lower dielectric constant than the first dielectric material; providing composite dielectric substrates through slicing the composite dielectric block in parallel with a direction of laminating the first and second dielectric materials; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the composite dielectric substrates, respectively; and laminating the composite dielectric substrates having the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode thereon.
Claim 42
Dependent Claim
65 words
38 . A method according to claim 37 , wherein said step of providing the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode includes the sub-step of: forming at least one of the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode through printing a pattern of conductive paste containing at least one of gold, silver, and copper.
Claim 43
Dependent Claim
63 words
39 . A method according to claim 37 , wherein said step of providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode includes the sub-step of: forming at least one of the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode with a metallic foil containing at least one of gold, silver, and copper.
Claim 44
Dependent Claim
50 words
40 . A method according to claim 37 , wherein the first dielectric material is made of ceramic material of one of Bi—Ca—Nb—O base, Ba—Ti—O base and Zr(Mg, Zn, Nb)Ti—Mn—O base, and wherein the second dielectric material is made of ceramic material of one of forsterite and alumina borosilicate glass.
Claim 45
Dependent Claim
142 words
41 . A method of manufacturing a dielectric filter comprising the steps of: providing a composite dielectric block in green sheet form through laminating a first dielectric material in green sheet form and a second dielectric material in green sheet form having a lower dielectric constant than the first dielectric material; providing composite dielectric substrates in green sheet form through slicing the composite dielectric block in green sheet form in parallel with a direction of laminating the first and second dielectric materials; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the composite dielectric substrates in green sheet form, respectively; laminating the composite dielectric substrates in green sheet form having the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode thereon; and firing the laminated composite dielectric substrates in green sheet form.
Claim 46
Dependent Claim
142 words
41 . A method of manufacturing a dielectric filter comprising the steps of: providing a composite dielectric block in green sheet form through laminating a first dielectric material in green sheet form and a second dielectric material in green sheet form having a lower dielectric constant than the first dielectric material; providing composite dielectric substrates in green sheet form through slicing the composite dielectric block in green sheet form in parallel with a direction of laminating the first and second dielectric materials; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the composite dielectric substrates in green sheet form, respectively; laminating the composite dielectric substrates in green sheet form having the inter-stage coupling capacitor electrode, the resonator electrodes, and the input/output coupling capacitor electrode thereon; and firing the laminated composite dielectric substrates in green sheet form.
Claim 47
Dependent Claim
63 words
42 . A method according to claim 41 , wherein said step of providing the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode includes the sub-step of: providing at least one of the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode through printing a pattern of conductive paste containing at least one of gold, silver, and copper.
Claim 48
Dependent Claim
60 words
43 . A method according to claim 41 , wherein said step of providing the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode includes the sub-step of: providing at least one of the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode from a metallic foil containing at least one of gold, silver, and copper.
Claim 49
Dependent Claim
50 words
44 . A method according to claim 41 , wherein the first dielectric material is made of ceramic material of one of Bi—Ca—Nb—O base, Ba—Ti—O base, and Zr(Mg, Zn, Nb)Ti—Mn—O base, and wherein the second dielectric material is made of ceramic material of one of forsterite and alumina borosilicate glass.
Claim 50
Dependent Claim
135 words
45 . A method of manufacturing a dielectric filter comprising the steps of: providing a ceramic dielectric block in green sheet form through laminating a first dielectric material in green sheet form and a second dielectric material in green sheet form having a lower dielectric constant than the first dielectric material; providing a plurality of composite dielectric substrates in green sheet form through slicing the composite ceramic dielectric block in green sheet form in parallel with a direction of laminating the first and second dielectric materials; firing the composite dielectric substrates in green sheet form; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the fired composite dielectric substrates; and laminating the composite dielectric substrates having the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode thereon.
Claim 51
Dependent Claim
135 words
45 . A method of manufacturing a dielectric filter comprising the steps of: providing a ceramic dielectric block in green sheet form through laminating a first dielectric material in green sheet form and a second dielectric material in green sheet form having a lower dielectric constant than the first dielectric material; providing a plurality of composite dielectric substrates in green sheet form through slicing the composite ceramic dielectric block in green sheet form in parallel with a direction of laminating the first and second dielectric materials; firing the composite dielectric substrates in green sheet form; providing an inter-stage coupling capacitor electrode, resonator electrodes, and an input/output coupling capacitor electrode on the fired composite dielectric substrates; and laminating the composite dielectric substrates having the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode thereon.
Claim 52
Dependent Claim
37 words
46 . A method according to claim 45 , wherein said step of laminating the composite dielectric substrates includes the sub-step of: bonding the composite dielectric substrates to each other with a resin material containing thermoset rein.
Claim 53
Dependent Claim
20 words
47 . A method according to claim 46 , wherein the resin material is a composite material containing inorganic filler.
Claim 54
Dependent Claim
35 words
48 . A method according to claim 45 , wherein said step of laminating the composite dielectric substrates includes the sub-step of: bonding the composite dielectric substrates with a heated amount of low-melting glass flit.
Claim 55
Dependent Claim
63 words
49 . A method according to claim 45 , wherein said step of providing the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode includes the sub-step of: providing at least one of the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode through printing a pattern of conductive paste containing at least one of gold, silver, and copper.
Claim 56
Dependent Claim
60 words
50 . A method according to claim 45 , wherein said step of providing the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode includes the sub-step of: providing at least one of the inter-stage coupling capacitor electrode, resonator electrodes, and input/output coupling capacitor electrode from a metallic foil containing at least one of gold, silver, and copper.
Claim 57
Dependent Claim
50 words
51 . A method according to claim 45 , wherein the first dielectric material is made of ceramic material of one of Bi—Ca—Nb—O base, Ba—Ti—O base, and Zr(Mg, Zn, Nb)Ti—Mn—O base, and wherein the second dielectric material is made of ceramic material of one of forsterite and alumina borosilicate glass.
Claim 58
Dependent Claim
41 words
52 . An antenna duplexer comprising: an antenna port; a first filter including the dielectric filter according to any one of claims 27 to 36 , being coupled to the antenna port; and a second filter coupled to the antenna port.
Claim 59
Dependent Claim
56 words
53 . An antenna duplexer comprising: an antenna port; a first filter including the dielectric filter according to any one of claims 27 to 36 , being coupled to the antenna port; and a second filter including the dielectric filter according to any one of claims 27 to 36 , being coupled to the antenna port.
Claim 60
Dependent Claim
16 words
54 . A communication apparatus including the antenna duplexer according to claim 52 or 53 .
Claim 61
Dependent Claim
19 words
55 . A communication apparatus including the dielectric filter according to any one of claims 27 to 36 .
References Cited (Backward Citations)
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