Double tuned, coupled microstrip antenna
First Claim
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1. An antenna for radiating a signal in a range of frequencies having a predetermined center frequency comprising:
- a ground plane conductor;
a first microstrip resonator for electromagnetically coupling energy to a metal radiator, said first resonator including shunt means for connecting a first end thereof to said ground plane conductor and a second end adapted to receive said signal, said first resonator being resonate at a quarter wavelength of said predetermined center frequency,said metal radiator having a radiating surface positioned above said first resonator by a predetermined distance,said radiating surface of said radiator having a first dimension of electrical length of a half wavelength of said predetermined center frequency and having a first edge substantially parallel to said first dimension,said first microstrip resonator having an electrical length between said first and second ends substantially parallel to said first dimension of said radiator and having a width with an edge between said first and second ends of said first resonator extending outward beyond said first edge of said radiator,said metal radiator being resonate at substantially a half wavelength of said predetermined center frequency whereby the reactance at said second end of said first resonator is of opposite sign to that of the reactance coupled in from said metal radiator at a plurality of frequencies in said range of frequencies.
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Abstract
An first antenna for radiating a signal at a predetermined frequency employing at least one 1/4 wave-length microstrip resonator positioned below a metal 1/4 wavelength radiator. A circularly polarized antenna including a 1/2 wavelength radiator electromagnetically coupled to a 1/4 wavelength resonator is further disclosed.
60 Citations
9 Claims
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1. An antenna for radiating a signal in a range of frequencies having a predetermined center frequency comprising:
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a ground plane conductor; a first microstrip resonator for electromagnetically coupling energy to a metal radiator, said first resonator including shunt means for connecting a first end thereof to said ground plane conductor and a second end adapted to receive said signal, said first resonator being resonate at a quarter wavelength of said predetermined center frequency, said metal radiator having a radiating surface positioned above said first resonator by a predetermined distance, said radiating surface of said radiator having a first dimension of electrical length of a half wavelength of said predetermined center frequency and having a first edge substantially parallel to said first dimension, said first microstrip resonator having an electrical length between said first and second ends substantially parallel to said first dimension of said radiator and having a width with an edge between said first and second ends of said first resonator extending outward beyond said first edge of said radiator, said metal radiator being resonate at substantially a half wavelength of said predetermined center frequency whereby the reactance at said second end of said first resonator is of opposite sign to that of the reactance coupled in from said metal radiator at a plurality of frequencies in said range of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification