EP0641035A2
Expired / Lapsed
EP
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A laminated antenna duplexer and a dielectric filter
Assignee: Panasonic Holdings Corp
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Filing: 1994-08-23
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Granted: —
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Expires: 2014-08-23
Abstract
Abstract A dielectric antenna duplexer used in a high frequency radio device such as a portable telephone, and a dielectric filter for forming the duplexer of the SIR (stepped impedance resonator) composed by cascade connection of first transmission lines having one end grounded and second transmission lines having one end open and lower in characteristic impedance than in the first transmission lines, first transmission lines and second transmission lines are individually coupled in electromagnetic field, thereby forming an antenna duplexer and a dielectric filter of small insertion loss, high bandwidth selectivity, excellent band pass characteristic, and low cost.
Inventors
- 👤 Toshio Ishizaki
- 👤 Atsushi Sasaki
- 👤 Yuki Satoh
- 👤 Hiroshi Kushitani
- 👤 Hideaki Nakakubo
- 👤 Toshiaki Nakamura
- 👤 Kimio Aizawa
- 👤 Takashi Fujino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20345; H01P1/20354; H01P1/20381; H01P1/205; H01P1/2056; H01P1/213; H01P1/2135
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
104 words
A dielectric filter comprising at least two TEM mode resonators having a stepped impedance resonator structure with a total line length shorter than the quarter wavelength comprising a cascade connection of both ends of first transmission lines having a characteristic impedance grounded at one end, and second transmission lines opened at one end having a characteristic impedance lower than the characteristic impedance of the first transmission lines, wherein the first transmission lines are coupled electromagnetically, the second transmission lines are coupled electromagnetically, the electromagnetic field coupling amounts are set independently, and a passing band and an attenuation pole are generated in the transmission characteristic.
Claim 2
Dependent Claim
21 words
The dielectric filter of claim 1, wherein the open end of the TEM mode resonator is grounded with an electrical capacity.
Claim 3
Dependent Claim
22 words
The filter of claim 1 or 2, wherein at least two TEM mode resonators and input and output terminals are coupled capacitively.
Claim 4
Dependent Claim
38 words
The filter of claim 1, 2 or 3, wherein the attenuation pole frequency of the transmission characteristic is adjusted by varying the line distance of the first transmission lines and the line distance of the second transmission lines.
Claim 5
Dependent Claim
24 words
The filter of any of claims 1 to 4, wherein the first and second transmission lines have a line length equal to each other.
Claim 6
Dependent Claim
34 words
The block type dielectric filter of any of claims 1 to 5, wherein the TEM mode resonator is comprised of an integrated coaxial resonator formed of a penetration hole provided in a dielectric block.
Claim 7
Dependent Claim
26 words
The filter of any of claims 1 to 5, wherein the TEM mode resonator is comprised of a strip line resonator formed on a dielectric sheet.
Claim 8
Dependent Claim
50 words
The filter of any of claims 1 to 7, wherein the value of dividing the even mode impedance by the odd mode impedance of the first transmission lines is set larger than the value of dividing the even mode impedance by the odd mode impedance of the second transmission lines.
Claim 9
Dependent Claim
50 words
The filter of any of claims 1 to 7, wherein the value of dividing the even mode impedance by the odd mode impedance of the first transmission lines is set smaller than the value of dividing the even mode impedance by the odd mode impedance of the second transmission lines.
Claim 10
Dependent Claim
39 words
The filter of any of claims 1 to 9, wherein the value of dividing the even mode impedance of the second transmission lines by the even mode impedance of the first transmission lines is set at 0.2 to 0.8.
Claim 11
Dependent Claim
39 words
The filter of any of claims 1 to 10, wherein the value of dividing the even mode impedance of the second transmission lines by the even mode impedance of the first transmission lines is set at 0.4 to 0.6.
Claim 12
Dependent Claim
43 words
The filter of any of claims 1 to 11, wherein at least two TEM mode resonators are capacitively coupled by capacity coupling means provided separately, and coupling of the TEM mode resonators is achieved by combination of electromagnetic field coupling and capacity coupling.
Claim 13
Dependent Claim
21 words
The dielectric filter of claim 12, wherein capacity coupling by the capacity coupling means is achieved in the second transmission lines.
Claim 14
Dependent Claim
25 words
The dielectric filter of claim 12, wherein capacity coupling by the capacity coupling means is achieved at the open end of the TEM mode resonator.
Claim 15
Dependent Claim
24 words
The filter of claim 12, 13 or 14, wherein the open end of the TEM mode resonator is grounded through the capacity coupling means.
Claim 16
Dependent Claim
34 words
The filter of any of claims 12 to 15, wherein the attenuation pole of transmission characteristic is formed in a frequency range within 15% on both sides of the polarity of the center frequency.
Claim 17
Dependent Claim
95 words
A laminated dielectric filter comprising a strip line resonator electrode layer forming plural strip line resonators, and a capacity electrode layer, wherein the strip line resonator electrode layer and capacity electrode layer are sandwiched by two shield electrode layers, and the space between two shield electronic layers are filled with a dielectric, and the thickness between the strip line resonator electrode layer and capacity electrode layer is set thinner than the thickness between the strip line resonator electrode layer and shield electrode layer and the thickness between the capacity electrode layer and shield electrode layer.
Claim 18
Dependent Claim
46 words
The laminated dielectric filter of claim 17, wherein the dielectric between the strip line resonator electrode layer and the shield electrode layer, and the dielectric between the capacity electrode layer and the shield electrode layer are respectively formed by laminating a plurality of thin dielectric sheets.
Claim 19
Dependent Claim
57 words
The filter of claim 17 or 18, wherein the strip line resonator has a front end short-circuit structure, and the short-circuit end is connected and grounded electrically to the grounding terminal formed at the side of the dielectric through a broad common grounding electrode formed on the same electrode layer as the strip line resonator electrode layer.
Claim 20
Dependent Claim
61 words
The filter of claim 17, 18 or 19, wherein an interstage coupling capacity electrode, or input and output coupling capacity electrode, or loading capacity electrode formed on the capacity electrode layer has a dent shape narrowed in the electrode width in the region overlapping with the outer edge of the strip line resonator electrode of the strip line resonator electrode layer.
Claim 21
Dependent Claim
70 words
The filter of any of claims 17 to 20, wherein the laminated dielectric filter has an input and output coupling capacity electrode on the capacity electrode layer, and the strip line resonator has a front end short-circuit structure, and moreover the input and output coupling capacity electrode and strip line resonator are coupled capacitively at an intermediate position between the open end and short-circuit end of the strip line resonator.
Claim 22
Dependent Claim
37 words
The laminated dielectric filter of claim 21, wherein input and output terminals electrically connected to the input and output coupling capacity electrode are formed of side electrodes provided in the lateral direction of the strip line resonator.
Claim 23
Dependent Claim
46 words
The filter of any of claims 17 to 22, wherein the multiple factor of the shrinkage in baking of the dielectric is set smaller than the shrinkage rate in baking of the electrode material for composing the strip line resonator electrode layer and capacity electrode layer.
Claim 24
Dependent Claim
38 words
The filter of any of claims 17 to 23, wherein the laminated dielectric filter has at least two capacity electrode layers, said the two capacity electrode layers enclose the strip line resonator electrode layer from above and beneath.
Claim 25
Dependent Claim
97 words
A laminated dielectric filter formed by disposing a first strip line resonator on a first shield electrode through a first dielectric sheet with a thickness t₁, disposing second to n-th strip line resonators on the first strip line resonator through second to n-th dielectric sheets with thickness of t₂ to t n (n being a plural number of strip line resonators), disposing a second shield electrode on the n-th strip line resonator through the (n+1)-th dielectric sheet with thickness t n+1 , and setting thicknesses t₂ to t n different from thickness t₁ or t n+1 .
Claim 26
Dependent Claim
28 words
The laminated dielectric filter of claim 25 , wherein the thicknesses t₂ to t n have a maximum value set smaller than thickness t₁ or t n+1 .
Claim 27
Dependent Claim
29 words
The filter of claim 25 or 26, wherein the total of thicknesses t₂ to t n is set smaller than the total of thicknesses t₁ and t n+1 .
Claim 28
Dependent Claim
28 words
The filter of claim 25, 26 or 27, wherein the total of thicknesses t₂ to t n is set smaller than either thickness t₁ or t n+1 .
Claim 29
Dependent Claim
31 words
The filter of any of claims 25 to 28, wherein the number n of strip line resonators is 3 or more, and the thickness of t₂ to t n are equal.
Claim 30
Dependent Claim
28 words
The filter of any of claims 25 to 29, wherein the first shield electrode and second shield electrode are formed of inner layer electrodes enclosed by dielectric sheets.
Claim 31
Dependent Claim
27 words
The filter of any of claims 25 to 30, wherein the first dielectric sheet and the (n+1)-th dielectric sheet comprise a laminated plurality of thin dielectric sheets.
Claim 32
Dependent Claim
43 words
The laminated dielectric filter of claim 31, wherein an input and output coupling capacity electrode is formed respectively in one of the thin dielectric sheets of the first dielectric sheets, and in one of the thin dielectric sheets of the (n+1)-th dielectric sheet.
Claim 33
Dependent Claim
41 words
The filter of any of claims 25 to 32, wherein the position of the center line of the first to n-th strip line resonators is shifted parallel in the lateral direction in every one of the first to n-th dielectric sheets.
Claim 34
Dependent Claim
37 words
The filter of any of claims 25 to 33, wherein the first to n-th strip line resonators are used as front end short-circuit strip line resonators, and are laminated by aligning the direction of the short-circuit ends.
Claim 35
Dependent Claim
82 words
The laminated dielectric filter of claim 34, wherein broad grounding electrodes are formed at the short-circuit end side of the first to n-th strip line resonators, grounding side shield electrodes are provided by outer electrodes on the side of the short-circuit end side of the strip line resonator of the dielectric composed of the first to (n+1)-th dielectric sheets, and the short-circuit end of the strip line resonator is connected and grounded to the grounding side shield electrode through the grounding electrode.
Claim 36
Dependent Claim
117 words
The filter of claim 34 or 35, wherein an input and output coupling capacity electrode is formed respectively in one of the thin dielectric sheets of the first dielectric sheet, and in one of the thin dielectric sheets of the (n+1)-th dielectric sheet, the take-out direction of the input and output coupling capacity electrode is the right side direction of the strip line resonator in one, and the left side direction of the strip line resonator in the other, and they are connected as input and output terminals to the side input and output electrodes formed of outer electrodes, provided at the right and left sides of the laminate comprised by the first to (n+1)-th dielectric sheets.
Claim 37
Dependent Claim
31 words
The filter of claim 34, 35 or 36, wherein side shield electrodes are formed of outer electrodes at the sides of the laminate composed of the first to (n+1)-th dielectric sheets.
Claim 38
Dependent Claim
44 words
The filter of any of claims 34 to 37, wherein an open side shield electrode is formed of outer electrode at the side of the open end side of the strip line resonator of the laminate composed of the first to (n+1)-th dielectric sheets.
Claim 39
Dependent Claim
37 words
The filter of any of claims 34 to 38, wherein the line width at the short-circuit end side of the first to n-th strip line resonators is narrower than the line width of the open end side.
Claim 40
Dependent Claim
39 words
The laminated dielectric filter of claim 39, wherein the line distance of the short-circuit end side narrow parts of the first to n-th strip line resonators is different from the line distance of the open end side broad parts.
Claim 41
Dependent Claim
64 words
The filter of claim 39 or 40, wherein the positions of the line center lines of open end side broad parts of the first to n-th strip line resonators are aligned vertically, and the positions of the line center lines of the short-circuit end side narrow parts are shifted parallel in the lateral direction in every one of the first to n-th dielectric sheets.
Claim 42
Dependent Claim
38 words
A filter of any of claims 34 to 38, wherein the line width of the short-circuit end side of the first to n-th strip line resonators is set broader than the line width of the open end side.
Claim 43
Dependent Claim
40 words
The laminated dielectric filter of claim 42 , wherein the line distance of the short-circuit end side broad parts of the first to n-th strip line resonators is different from the line distance of the open end side narrow parts.
Claim 44
Dependent Claim
64 words
The filter of claim 42 or 43, wherein the positions of the line center lines of short-circuit end side broad parts of the first to n-th strip line resonators are aligned vertically, and the positions of the line center lines of the open end side narrow parts are shifted parallel in the lateral direction in every one of the first to n-th dielectric sheets.
Claim 45
Dependent Claim
80 words
A laminated dielectric filter formed by front end short-circuit strip line resonators on a plurality of first dielectric sheets, forming coupling shield electrodes possessing electric field coupling windows or magnetic field coupling windows on a different plurality of fifth dielectric sheets, laminating the first dielectric sheets and fifth dielectric sheets alternately by aligning the direction of short-circuit ends of the strip line resonators, grounding the coupling shield electrodes, and disposing shield electrodes through second dielectric sheets laminated above and beneath.
Claim 46
Dependent Claim
132 words
A laminated dielectric antenna duplexer comprising a laminate formed by laminating and baking integrally a plurality of dielectric sheets, at least three layers or more of shield electrode layers, and at least two layers or more of strip line resonator electrode layers, dividing the laminate into upper and lower laminate parts by at least one layer of shield electrode layer, constituting a reception filter in one part of the laminate by at least one layer of strip line resonator electrode layer, constituting a transmission filter in other part of the laminate by at least one layer of the strip line resonator electrode layer, and shielding the upper and lower parts of the laminate by using the shield electrode layers, thereby laminating the reception filter and transmission filter in upper and lower layers.
Claim 47
Dependent Claim
23 words
The laminated dielectric antenna duplexer of claim 46, wherein the transmission terminal and reception terminal are composed of side electrodes of different sides.
Claim 48
Dependent Claim
64 words
The laminated dielectric antenna duplexer of claim 47, wherein the strip line resonator electrode layers are composed of plural front end short-circuit strip line resonators, respectively, and the short-circuit end directions of the strip line resonator to be coupled directly with the transmission terminal and the strip line resonator to be coupled directly with the reception terminal are set in mutually different side directions.
Claim 49
Dependent Claim
72 words
The antenna duplexer of cliam 46, 47 or 48, wherein the shield electrode layers comprise at least four layers or more, the laminate is divided into two upper and lower laminate parts by a separation layer composed by enclosing a plurality of dielectric sheets in at least two layers of shield electrode layers, and an impedance matching element is formed by an electrode pattern on the dielectric sheet of the separation layer.
References Cited (Backward Citations)
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