EP0360415B1 - Dielectric waveguide - Google Patents
Dielectric waveguide Download PDFInfo
- Publication number
- EP0360415B1 EP0360415B1 EP89308429A EP89308429A EP0360415B1 EP 0360415 B1 EP0360415 B1 EP 0360415B1 EP 89308429 A EP89308429 A EP 89308429A EP 89308429 A EP89308429 A EP 89308429A EP 0360415 B1 EP0360415 B1 EP 0360415B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tetrafluoroethylene
- sheet
- electromagnetic wave
- dielectric sheet
- transmission circuit
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/16—Dielectric waveguides, i.e. without a longitudinal conductor
Definitions
- This invention relates to a transmission circuit for the transmission of electromagnetic waves of extremely short wavelength, such as microwaves, millimetre waves and submillimetre waves, and particularly relates to a planar transmission circuit.
- Coaxial cables, waveguides, microstrip lines, dielectric lines and other such devices are currently used to transmit these types of electromagnetic waves.
- a core of round or rectangular cross-section is formed by a dielectric of low dielectric loss and relatively high permittivity for transmitting the travelling wave energy of the electromagnetic wave, and the core is surrounded by a dielectric of lower permittivity.
- Surface waveguides composed of an inhomogeneous dielectric film are known from ELECTRONICS AND COMMUNICATIONS IN JAPAN, vol. 51-B, no. 3, 1968, pages 50-54; N. KUMAGAI et al.: "Surface waveguide consisting of inhomogeneous dielectric thin film".
- Other forms of high frequency transmission device have not been considered, and there is thus a problem of how to form circuit networks and to increase circuit density.
- a high frequency transmission circuit comprising a planar dielectric sheet having a continuous porosity, whereby a dielectric material of greater permittivity than the dielectric sheet is impregnated into portions of said dielectric sheet in the thickness direction thereof to form an electromagnetic wave propagating circuit in said planar dielectric sheet.
- a high frequency transmission circuit comprising a continuously porous, planar dielectric sheet having an electromagnetic wave propagating circuit therein formed by a dielectric material of higher permittivity impregnated into the dielectric sheet in the thickness direction thereof.
- the dielectric material forming the electromagnetic wave propagating circuit may be a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, a tetrafluoroethylene-ethylene copolymer or a tetrafluoroethylene dispersion.
- planar dielectric sheet is preferably porous, expanded polytetrafluoroethylene.
- the invention provides a high frequency transmission circuit having good transmission characteristics and capable of being used to expand the circuit in the planar direction.
- Any desired high frequency circuit can be formed with a thin continuously porous, planar dielectric sheet by lamination or other methods.
- the creation of high density, high frequency transmission circuits can also be accomplished.
- Figure 1 shows a high frequency transmission circuit 1 created by forming electromagnetic wave transmission portions 3 and 4 in portions of a porous, planar dielectric sheet 2, the latter being composed of continuously porous, expanded polytetrafluoroethylene film, and optionally laminating a protective film 5 to the upper and lower surfaces of the sheet 2.
- the protective films 5 may each be a prepreg sheet of porous, expanded polytetrafluoroethylene.
- a binder or alternatively, a tetrafluoroethylene resin dispersion and a binder, may be impregnated and fixed in portions of the sheet 2 to form the electromagnetic wave transmission portions 3 and 4.
- the binder may be a Teflon (R.T.M.) adhesive.
- These electromagnetic wave transmission portions 3 and 4 may be formed, for example, as shown in Figure 2, by applying an inverse pattern circuit mask 6 to the planar dielectric sheet 2, then applying the resin powder and binder composition to this circuit pattern portion and allowing natural impregnation to occur due to gravity, or applying a similar mask 6 to the bottom surface of the planar dielectric sheet 2 and facilitating impregnation by means of a vacuum pump 8.
- electromagnetic wave transmission portions 3 and 4 are formed having a permittivity higher than the planar dielectric sheet 2.
- the continuous porosity of the planar dielectric sheet 2 should be of the smallest scale possible, and that the continuous pores should be aligned as much as possible in the direction of the thickness of planar dielectric sheet 2, i.e. perpendicularly to the plane of the sheet, or that the porosity should be high in the thickness direction.
- the present invention allows a high frequency transmission circuit to be formed as a thin sheet, and the rectangular shape of the electromagnetic wave transmission portions maintains the plane of polarization, connections can be made without introducing significant error in the direction of the electromatic waves, and multiple layer devices can easily be produced.
- the invention relies upon impregnation into a continuously porous, planar dielectric sheet to form electromagnetic wave transmission circuit portions, thin devices can be produced and very high density transmission circuits can be made.
Abstract
Description
- This invention relates to a transmission circuit for the transmission of electromagnetic waves of extremely short wavelength, such as microwaves, millimetre waves and submillimetre waves, and particularly relates to a planar transmission circuit.
- Coaxial cables, waveguides, microstrip lines, dielectric lines and other such devices are currently used to transmit these types of electromagnetic waves. In all of these devices, a core of round or rectangular cross-section is formed by a dielectric of low dielectric loss and relatively high permittivity for transmitting the travelling wave energy of the electromagnetic wave, and the core is surrounded by a dielectric of lower permittivity. Surface waveguides composed of an inhomogeneous dielectric film are known from ELECTRONICS AND COMMUNICATIONS IN JAPAN, vol. 51-B, no. 3, 1968, pages 50-54; N. KUMAGAI et al.: "Surface waveguide consisting of inhomogeneous dielectric thin film". Other forms of high frequency transmission device have not been considered, and there is thus a problem of how to form circuit networks and to increase circuit density.
- According to the invention, there is provided a high frequency transmission circuit comprising a planar dielectric sheet having a continuous porosity, whereby a dielectric material of greater permittivity than the dielectric sheet is impregnated into portions of said dielectric sheet in the thickness direction thereof to form an electromagnetic wave propagating circuit in said planar dielectric sheet.
- In other words, a high frequency transmission circuit is provided comprising a continuously porous, planar dielectric sheet having an electromagnetic wave propagating circuit therein formed by a dielectric material of higher permittivity impregnated into the dielectric sheet in the thickness direction thereof.
- The dielectric material forming the electromagnetic wave propagating circuit may be a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, a tetrafluoroethylene-ethylene copolymer or a tetrafluoroethylene dispersion.
- The planar dielectric sheet is preferably porous, expanded polytetrafluoroethylene.
- It is desirable for the continuous pores of the porous, planar dielectric sheet to be aligned mainly in the thickness direction of the sheet, although even for a planar dielectric sheet whose porosity is unaligned, a similar impregnation result can be accomplished by using a masked impregnation method.
- The invention provides a high frequency transmission circuit having good transmission characteristics and capable of being used to expand the circuit in the planar direction. Any desired high frequency circuit can be formed with a thin continuously porous, planar dielectric sheet by lamination or other methods. The creation of high density, high frequency transmission circuits can also be accomplished.
- Preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:-
- Figure 1 is a schematic cross-sectional, perspective view of one embodiment of a high frequency transmission circuit in accordance with the invention; and
- Figure 2 shows a partial sectional view illustrating one method of making a high frequency transmission circuit in accordance with the invention.
- Figure 1 shows a high
frequency transmission circuit 1 created by forming electromagneticwave transmission portions dielectric sheet 2, the latter being composed of continuously porous, expanded polytetrafluoroethylene film, and optionally laminating aprotective film 5 to the upper and lower surfaces of thesheet 2. Theprotective films 5 may each be a prepreg sheet of porous, expanded polytetrafluoroethylene. - When expanded polytetrafluoroethylene film of permittivity 1.4 is used as the planar
dielectric sheet 2, a powder of tetrafluoroethylene-hexafluoropropylene copolymer resin, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer resin, tetrafluoroethylene-ethylene copolymer resin, or the like, with a permittivity of about 2, and a binder, or alternatively, a tetrafluoroethylene resin dispersion and a binder, may be impregnated and fixed in portions of thesheet 2 to form the electromagneticwave transmission portions - These electromagnetic
wave transmission portions pattern circuit mask 6 to the planardielectric sheet 2, then applying the resin powder and binder composition to this circuit pattern portion and allowing natural impregnation to occur due to gravity, or applying asimilar mask 6 to the bottom surface of the planardielectric sheet 2 and facilitating impregnation by means of avacuum pump 8. - When the composition 7 is dried after being impregnated in this way, electromagnetic
wave transmission portions dielectric sheet 2. - In order to form electromagnetic
wave transmission portions dielectric sheet 2 should be of the smallest scale possible, and that the continuous pores should be aligned as much as possible in the direction of the thickness of planardielectric sheet 2, i.e. perpendicularly to the plane of the sheet, or that the porosity should be high in the thickness direction. - Because the present invention allows a high frequency transmission circuit to be formed as a thin sheet, and the rectangular shape of the electromagnetic wave transmission portions maintains the plane of polarization, connections can be made without introducing significant error in the direction of the electromatic waves, and multiple layer devices can easily be produced.
- Furthermore, because the invention relies upon impregnation into a continuously porous, planar dielectric sheet to form electromagnetic wave transmission circuit portions, thin devices can be produced and very high density transmission circuits can be made.
Claims (8)
- A high frequency transmission circuit having a planar dielectric sheet (2) characterised in that said sheet has a continuous porosity, whereby a dielectric material of greater permittivity than the dielectric sheet is impregnated into portions of said dielectric sheet in the thickness direction thereof to form an electromagnetic wave propagating circuit (3,4) in said planar dielectric sheet (2).
- A transmission circuit according to claim 1, wherein the dielectric material of the electromagnetic wave propagating circuit (3,4) is a tetrafluoroethylene-hexafluoropropylene copolymer.
- A transmission circuit according to claim 1, wherein the dielectric material of the electromagnetic wave propagating circuit (3,4) is a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer.
- A transmission circuit according to claim 1, wherein the dielectric material of the electromagnetic wave propagating circuit (3,4) is a tetrafluoroethylene-ethylene copolymer.
- A transmission circuit according to claim 1, wherein the dielectric material of the electromagnetic wave propagating circuit (3,4) is a tetrafluoroethylene dispersion.
- A transmission circuit according to any one of the preceding claims, wherein said planar dielectric sheet (2) is porous, expanded polytetrafluoroethylene.
- A transmission circuit according to any one of the preceding claims, wherein the continuous pores of the planar dielectric sheet (2) are aligned mainly in the thickness direction of the sheet.
- A transmission circuit according to any one of the preceding claims, having a protective film (5) laminated to at least one face of the planar dielectric sheet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89308429T ATE99838T1 (en) | 1988-08-19 | 1989-08-18 | DIELECTRIC WAVE GUIDE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63206178A JPH0254602A (en) | 1988-08-19 | 1988-08-19 | High frequency transmission circuit |
| JP206178/88 | 1988-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0360415A1 EP0360415A1 (en) | 1990-03-28 |
| EP0360415B1 true EP0360415B1 (en) | 1994-01-05 |
Family
ID=16519105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89308429A Expired - Lifetime EP0360415B1 (en) | 1988-08-19 | 1989-08-18 | Dielectric waveguide |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0360415B1 (en) |
| JP (1) | JPH0254602A (en) |
| AT (1) | ATE99838T1 (en) |
| AU (1) | AU3943889A (en) |
| DE (1) | DE68912043T2 (en) |
| GB (1) | GB2222314A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9621049D0 (en) * | 1996-10-09 | 1996-11-27 | Secr Defence | Dielectric composites |
| JP3886459B2 (en) * | 2003-01-28 | 2007-02-28 | 株式会社神戸製鋼所 | Dielectric line manufacturing method |
| CN102260378B (en) * | 2011-05-06 | 2013-03-20 | 广东生益科技股份有限公司 | Composite material, high-frequency circuit board manufactured therefrom and manufacturing method of high-frequency circuit board |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1047896B (en) * | 1952-04-15 | 1958-12-31 | Siemens Ag | Waveguide arrangement consisting of one or more layers of dielectric material |
| FR1372610A (en) * | 1963-08-06 | 1964-09-18 | Transmission line with dielectric | |
| US4463329A (en) * | 1978-08-15 | 1984-07-31 | Hirosuke Suzuki | Dielectric waveguide |
| JP2700553B2 (en) * | 1988-03-31 | 1998-01-21 | 株式会社 潤工社 | Transmission circuit |
-
1988
- 1988-08-19 JP JP63206178A patent/JPH0254602A/en active Pending
-
1989
- 1989-08-09 AU AU39438/89A patent/AU3943889A/en not_active Abandoned
- 1989-08-18 EP EP89308429A patent/EP0360415B1/en not_active Expired - Lifetime
- 1989-08-18 GB GB8918931A patent/GB2222314A/en not_active Withdrawn
- 1989-08-18 AT AT89308429T patent/ATE99838T1/en not_active IP Right Cessation
- 1989-08-18 DE DE68912043T patent/DE68912043T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0360415A1 (en) | 1990-03-28 |
| ATE99838T1 (en) | 1994-01-15 |
| DE68912043D1 (en) | 1994-02-17 |
| GB8918931D0 (en) | 1989-09-27 |
| DE68912043T2 (en) | 1994-07-14 |
| GB2222314A (en) | 1990-02-28 |
| AU3943889A (en) | 1990-02-22 |
| JPH0254602A (en) | 1990-02-23 |
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