Electromagnetic transmission line elements having a boundary between materials of high and low dielectric constants
First Claim
1. An electromagnetic wave propagation structure comprising:
- a first element of dielectric material and a second element of dielectric material, the material of one of said first and said second elements having a high dielectric constant, the material of the other one of said first and said second elements having a relatively low dielectric constant, the ratio of the high dielectric constant to the low dielectric constant being greater than approximately 40;
wherein said first element has a surface which is contiguous with a surface of said second element at an interface constituting a waveguide wall extending along a direction of electromagnetic propagation, said waveguide wall being part of a waveguide;
one of said first and said second elements serves as a support for the other of said first and said second elements;
said interface is configured as a closed path in a cross sectional orientation of said waveguide;
the one of said first and said second elements having the material of high dielectric constant is located outside of said closed path; and
the other of said first and said second elements having the material of low dielectric constant is located within said closed path.
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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.
703 Citations
5 Claims
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1. An electromagnetic wave propagation structure comprising:
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a first element of dielectric material and a second element of dielectric material, the material of one of said first and said second elements having a high dielectric constant, the material of the other one of said first and said second elements having a relatively low dielectric constant, the ratio of the high dielectric constant to the low dielectric constant being greater than approximately 40; wherein said first element has a surface which is contiguous with a surface of said second element at an interface constituting a waveguide wall extending along a direction of electromagnetic propagation, said waveguide wall being part of a waveguide; one of said first and said second elements serves as a support for the other of said first and said second elements; said interface is configured as a closed path in a cross sectional orientation of said waveguide; the one of said first and said second elements having the material of high dielectric constant is located outside of said closed path; and the other of said first and said second elements having the material of low dielectric constant is located within said closed path.
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2. An electromagnetic wave propagation structure comprising:
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a first element of dielectric material and a second element of dielectric material, the material of one of said first and said second elements having a high dielectric constant, the material of the other one of said first and said second elements having a relatively low dielectric constant, the ratio of the high dielectric constant to the low dielectric constant being greater than approximately 40; wherein said first element has a surface which is contiguous with a surface of said second element at an interface constituting a waveguide wall extending along a direction of electromagnetic propagation, said waveguide wall being part of a waveguide; said interface is configured as a closed path in a cross sectional orientation of said waveguide; wherein said direction of propagation coincides with an axis of said waveguide, said first element serves as a core of said waveguide, said core being enclosed by said interface and extending in a longitudinal direction along said axis, said core extending transversely from said axis to said interface; said high dielectric constant is in excess of approximately 80, and said low dielectric constant is less than approximately 2; and said second element serves as a cladding of said waveguide, said cladding encircling said core to provide the support for the core and being contiguous with said core at said interface; and said core comprises the low dielectric-constant material and said cladding comprises the high dielectric-constant material.
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3. An electromagnetic wave propagation structure comprising:
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a first element of dielectric material and a second element of dielectric material, the material of one of said first and said second elements having a high dielectric constant, the material of the other one of said first and said second elements having a relatively low dielectric constant, the ratio of the high dielectric constant to the low dielectric constant being greater than approximately 40; wherein said first element has a surface which is contiguous with a surface of said second element at an interface constituting a waveguide wall extending along a direction of electromagnetic propagation, said waveguide wall being part of a waveguide; said interface is configured as a closed path in a cross sectional orientation of said waveguide; said direction of propagation coincides with an axis of said waveguide, said first element serves as a core of said waveguide, said core being enclosed by said interface and extending in a longitudinal direction along said axis, said core extending transversely from said axis to said interface for propagation of the electromagnetic wave through said core; said second element serves as a cladding of said waveguide, said cladding encircling said core to provide the support for the core and being contiguous said core at said interface; and said core comprises the low dielectric-constant material and said cladding comprises the high dielectric-constant material. - View Dependent Claims (4, 5)
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Specification