Electromagnetic transmission line elements having a boundary between materials of high and low dielectric constants
US5889449A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1995 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Dec 7, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P5/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electromagnetic wave propagation structure, suitable for the transmission of an electromagnetic wave and the formation of resonators within filters, is constructed of both high and low dielectric-constant materials wherein the high dielectric-constant is in excess of approximately 80 and the low dielectric-constant is less than approximately 2. A boundary between the high and the low dielectric-constant materials serves as an electric wall to waves propagating in the low dielectric-constant material and as a magnetic wall to waves propagating in the high dielectric-constant material. This permits substitution of the high dielectric-constant material for metal elements, such as resonators and feed structures in filters. Furthermore, the use of a cladding of dielectric material of one of the foregoing dielectric ranges about a core of material of the other of the foregoing dielectric ranges enables construction of waveguides having rectangular and circular cross-sections. Microstrip and stripline structures with substitution of the high dielectric-constant material for the harmonic elements may also be constructed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.