Radiator bandwidth enhancement using dielectrics with inverse frequency dependence
First Claim
1. A frequency independent radiating element having a signal operating frequency band, said radiating element comprising a radiator which launches a forward-directed wave and a back-directed wave, a reflecting groundplane separated from said radiator by nominal constant spacing distance equivalent to one quarter wave-length at a nominal frequency within said frequency band, and a dielectric material structures disposed between said radiator and said groundplane, said dielectric material structure having an intrinsic, frequency-dependent relative dielectric constant that varies in monotonically decreasing function with inverse frequency dependence for signals within said frequency band, said variation of said dielectric constant occurring intrinsically without application of control signals such that said dielectric material structure simultaneously present different dielectric constants to multi-frequency RF signals propagating through said structure, wherein said back-directed wave passes through said dielectric material structure, is reflected from said group plane, and passes again through said dielectric material structure so that said forward-directed wave and said reflected back-directed wave reinforce one another to improve a radiation efficiency of said radiating element over said frequency band for simultaneous multi-frequency operation, wherein said radiating efficiency is substantially independent of frequency for operation over said frequency band.
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Abstract
A dielectric material having a dielectric constant which varies inversely with frequency, and preferably with the second power of frequency, fills the space between a radiator and a reflecting groundplane. The back-directed wave is reflected back to the radiator in phase with the directly radiated wave over a wide frequency band, increasing the radiator efficiency.
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Citations
17 Claims
- 1. A frequency independent radiating element having a signal operating frequency band, said radiating element comprising a radiator which launches a forward-directed wave and a back-directed wave, a reflecting groundplane separated from said radiator by nominal constant spacing distance equivalent to one quarter wave-length at a nominal frequency within said frequency band, and a dielectric material structures disposed between said radiator and said groundplane, said dielectric material structure having an intrinsic, frequency-dependent relative dielectric constant that varies in monotonically decreasing function with inverse frequency dependence for signals within said frequency band, said variation of said dielectric constant occurring intrinsically without application of control signals such that said dielectric material structure simultaneously present different dielectric constants to multi-frequency RF signals propagating through said structure, wherein said back-directed wave passes through said dielectric material structure, is reflected from said group plane, and passes again through said dielectric material structure so that said forward-directed wave and said reflected back-directed wave reinforce one another to improve a radiation efficiency of said radiating element over said frequency band for simultaneous multi-frequency operation, wherein said radiating efficiency is substantially independent of frequency for operation over said frequency band.
Specification