High-gain digitally tuned antenna system with modified swept-back fractal (MSBF) blade
First Claim
1. A high-gain digitally tuned antenna system suitable for use on aircraft, comprising:
- a radiator, said radiator comprising a modified swept-back fractal (MSBF) element, wherein said fractal element has a Sierpinski carpet fractal based on a parallelogram having a vertex angle of between 55° and
65°
;
a digital tuning circuit coupled to said radiator, said digital tuning circuit comprising an array of inductors which can be selectively connected to form a network which tunes said antenna system to a selected tuning frequency.
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Abstract
A high-gain digitally tuned antenna system comprises a modified swept-back fractal (MSBF) radiator element, with the fractal preferably being a Sierpinski carpet fractal based on a parallelogram. A digital tuning circuit coupled to the radiator comprises an array of inductors which can be selectively connected to form a network which tunes the antenna system to a selected tuning frequency. The system is preferably arranged to selectively connect the inductors in series such that the combined inductances substantially cancel the capacitance of the radiator at a selected tuning frequency. The antenna system is preferably arranged to operate over the 30-88 MHz, 108-174 MHz, and 225-600 MHz bands, with a radiator height of 15″ or less.
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Citations
22 Claims
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1. A high-gain digitally tuned antenna system suitable for use on aircraft, comprising:
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a radiator, said radiator comprising a modified swept-back fractal (MSBF) element, wherein said fractal element has a Sierpinski carpet fractal based on a parallelogram having a vertex angle of between 55° and
65°
;a digital tuning circuit coupled to said radiator, said digital tuning circuit comprising an array of inductors which can be selectively connected to form a network which tunes said antenna system to a selected tuning frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A high-gain digitally tuned antenna system suitable for use on aircraft, comprising:
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a radiator, said radiator comprising a modified Sierpinski swept-back fractal (MSBF) element based on a parallelogram with a vertex angle of 55°
-65°
; anda digital tuning circuit coupled to said radiator, said digital tuning circuit comprising an array of inductors which can be selectively connected in series to tune said antenna system to a selected tuning frequency in the 30-88 MHz band; said radiator having a height of 15″
or less. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification