Method of constructing multiple-frequency dipole or monopole antenna elements using closely-coupled resonators
First Claim
1. A method of making a multiple-frequency antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint, comprising the steps of:
- providing a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint, said driven conductor comprising a one-half wavelength dipole;
providing a non-driven conductor which is one-half wavelength resonant at a second arbitrary predetermined frequency different from said first frequency; and
disposing said driven and non-driven conductors in a substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple said driven and non-driven conductors and produce a non-reactive impedance at said feedpoint at both said first and second frequencies, wherein said predetermined spacing of said driven and non-driven conductors is determined according to the equation;
##EQU4## where, d12 is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at said second frequency;
D is the diameter of the driven and non-driven conductors, expressed in wavelengths at said second frequency;
Z0 is the desired impedance at said second frequency;
F1 is the resonant frequency of said driven conductor; and
F2 is the resonant frequency of said non-driven conductor.
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Abstract
A multiple-frequency monopole or dipole antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint includes a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint. A number n of additional non-driven conductors, wherein n is at least one, resonant at respective n arbitrary predetermined frequencies different from the first frequency are disposed in substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple the driven and non-driven conductors and produce a non-reactive impedance at the feedpoint at the first and at each n additional frequency. Preferably, the predetermined spacing of the driven and non-driven conductors is determined according to the equation: ##EQU1## where d1n is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at the n frequency, D is the diameter of the driven and non-driven conductors, expressed in wavelengths at the n frequency, Z0 is the desired impedance at the n frequency when the antenna element is a dipole, or twice the desired impedance when the antenna element is a monopole, F1 is the resonant frequency of the driven conductor, and Fn is the resonant frequency of the n non-driven conductor.
57 Citations
3 Claims
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1. A method of making a multiple-frequency antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint, comprising the steps of:
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providing a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint, said driven conductor comprising a one-half wavelength dipole; providing a non-driven conductor which is one-half wavelength resonant at a second arbitrary predetermined frequency different from said first frequency; and disposing said driven and non-driven conductors in a substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple said driven and non-driven conductors and produce a non-reactive impedance at said feedpoint at both said first and second frequencies, wherein said predetermined spacing of said driven and non-driven conductors is determined according to the equation;
##EQU4## where, d12 is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at said second frequency;D is the diameter of the driven and non-driven conductors, expressed in wavelengths at said second frequency; Z0 is the desired impedance at said second frequency; F1 is the resonant frequency of said driven conductor; and F2 is the resonant frequency of said non-driven conductor.
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2. A method of making a multiple-frequency antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint, comprising the steps of:
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providing a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint, said driven conductor comprising a one-quarter wavelength monopole; providing a non-driven conductor which is one-quarter wavelength resonant at a second arbitrary predetermined frequency different from said first frequency; and disposing said driven and non-driven conductors in a substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple said driven and non-driven conductors and produce a non-reactive impedance at said feedpoint at both said first and second frequencies, wherein said predetermined spacing of said driven and non-driven conductors is determined according to the equation;
##EQU5## where, d12 is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at said second frequency;D is the diameter of the driven and non-driven conductors, expressed in wavelengths at said second frequency; Z0 is twice the desired impedance at said second frequency; F1 is the resonant frequency of said driven conductor; and F2 is the resonant frequency of said non-driven conductor.
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3. A multiple-frequency antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint, comprising:
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a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint; a number n of non-driven conductors resonant at a number n of respective additional arbitrary predetermined frequencies different from said first frequency, wherein n is at least one; said driven and non-driven conductors disposed in substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple said driven and non-driven conductors and produce a non-reactive impedance at said feedpoint at said first arbitrary predetermined frequency and at each of said n additional frequencies; and said predetermined spacing of said driven and non-driven conductors determined according to the equation;
##EQU6## where, d1n is the spacing on centers between the driven and non-driven conductors, expressed in wavelengths at said n additional frequency;D is the diameter of the driven and non-driven conductors, expressed in wavelengths at said n additional frequency; Z0 is the desired feedpoint impedance at said n additional frequency when the antenna element is a dipole, or twice the desired impedance when the antenna element is a monopole; F1 is the resonant frequency of the driven conductor; and Fn is the resonant frequency of said n non-driven conductor.
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Specification