Microstrip radiator with folded resonant cavity
First Claim
1. In an antenna for operation at a predetermined frequency, of the type including a resonant cavity defined between two conductive sheets also defining a radiating aperture between the edge of at least one of the sheets and the remaining sheet, said resonant cavity having a longitudinal resonant dimension approximately equal to a predetermined multiple of one-quarter of a wavelength at said predetermined frequency, said cavity resonant dimension being no larger than one wavelength of said predetermined frequency, the improvement wherein:
- said resonant cavity is folded along at least one axis transverse to said resonant dimension such that the longitudinal size of said antenna is reduced.
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Accused Products
Abstract
A resonant microstrip radiator wherein the size of the radiator is reduced in the resonant or non-resonant dimensions, or both, without reducing the effective resonant dimension or substantially lowering the efficiency of the radiator. Reduction of the resonant dimension is provided by folding the resonant cavity, while reduction of the non-resonant dimension is facilitated by utilization of a low density, low loss dielectric, such that the loss resistance of the element is appreciable with respect to the radiation resistance of the element. Also disclosed are interdigitated antenna structures and provisions for circularly or elliptically polarized radiation.
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Citations
37 Claims
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1. In an antenna for operation at a predetermined frequency, of the type including a resonant cavity defined between two conductive sheets also defining a radiating aperture between the edge of at least one of the sheets and the remaining sheet, said resonant cavity having a longitudinal resonant dimension approximately equal to a predetermined multiple of one-quarter of a wavelength at said predetermined frequency, said cavity resonant dimension being no larger than one wavelength of said predetermined frequency, the improvement wherein:
said resonant cavity is folded along at least one axis transverse to said resonant dimension such that the longitudinal size of said antenna is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 32, 33, 34)
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11. In an antenna assembly for operation at a predetermined frequency of the type including first and second conductive sheets, said conductive sheets being disposed substantially in parallel and being separated by a dielectric material, said conductive sheets defining a resonant cavity therebetween having radiating slot apertures longitudinally spaced apart at a predetermined distance approximately equal to one-half wavelength of said predetermined frequency, the improvement wherein:
said conductive sheets and said dielectric material are folded along at least one axis parallel to at least one of said radiating apertures, folding thereby said resonant cavity such that the longitudinal dimension of said antenna assembly is reduced. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An antenna assembly for operation at a predetermined frequency comprising, in combination:
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a first conductive element having a plurality of projecting sections; a second conductive element having a plurality of projecting sections; the projecting sections of said first and second conducting elements being disposed in an interdigitated manner, and being interspaced with a dielectric material, said first and second conductive elements defining a resonant cavity between the projecting sections thereof such that said resonant cavity is of a length no longer than approximately one wavelength of a signal at said predetermined frequency in said dielectric material and equal to approximately a predetermined multiple of one-quarter of a wavelength of said signal of said predetermined frequency in said dielectric material. - View Dependent Claims (18, 19, 20, 21, 22, 23, 35, 36, 37)
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24. An antenna assembly of the type including a first conductive element separated from a second conductive element by a dielectric material, said first and second conductive elements defining a half-wave resonant cavity therebetween and at least one radiating aperture, the improvement wherein:
said first and second conductive elements each comprise a plurality of conductive sheets interconnected by at least one further conductive sheet, the plurality of conductive sheets of said first and second conductive elements being disposed alternately in an overlaying manner, separated by said dielectric material. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
Specification