Frequency-selective antenna with different signal polarizations
First Claim
Patent Images
1. A dual-frequency antenna for operation with first and second rf signals which respectively have λ
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1 and λ
2 wavelengths, comprising;
a slot radiator configured to radiate said first rf signal with linear polarization;
a patch radiator configured to radiate said second rf signal with elliptical radiation; and
a transmission line configured to carry said first and second rf signals and arranged to couple said first rf signal to said slot radiator and to couple said second rf signal to said patch radiator;
wherein;
said slot radiator includes a ground plane configured to define a slot radiative element;
said transmission line is spaced from a first side of said ground plane; and
said slot radiative element is positioned to couple said first rf signal between said transmission line and free space.
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Abstract
A slot radiator and a patch radiator are formed in a single antenna which is connected to a handheld, wireless telephone. The antenna can be pivoted to operational positions and excited to radiate linearly-polarized signals or circularly-polarized signals whose radiation patterns are respectively directed azimuthally and elevationally.
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Citations
28 Claims
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1. A dual-frequency antenna for operation with first and second rf signals which respectively have λ
-
1 and λ
2 wavelengths, comprising;a slot radiator configured to radiate said first rf signal with linear polarization; a patch radiator configured to radiate said second rf signal with elliptical radiation; and a transmission line configured to carry said first and second rf signals and arranged to couple said first rf signal to said slot radiator and to couple said second rf signal to said patch radiator; wherein; said slot radiator includes a ground plane configured to define a slot radiative element; said transmission line is spaced from a first side of said ground plane; and said slot radiative element is positioned to couple said first rf signal between said transmission line and free space. - View Dependent Claims (2, 3, 4, 5, 6)
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1 and λ
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7. A dual-frequency atenna for operation with first and second rf signals which respectively have λ
-
1 and λ
2 wavelengths, comprising;a slot radiator configured to radiate said first rf signal with linear polarization; a patch radiator configured to radiate said second rf signal with elliptical radiation; and a transmission line configured to carry said first and second rf signals and arranged to coupled said first rf signal to said slot radiator and to couple said second rf signal to said patch radiator; wherein said patch radiator includes; a ground plane configured to define first and second aperatures; and a patch radiative element spaced from a first side of said ground plane; and wherein said transmission line is spaced from a second side of said ground plane; and said first and second aperatures are positioned to coupled said second rf signal between said transmission line and said patch radiative element. - View Dependent Claims (8, 9, 10, 11, 12)
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1 and λ
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13. A dual-frequency antenna for operation with first and second rf signals which respectively have λ
-
1 and λ
2 wavelengths, comprising;a first ground plane; a second ground plane spaced from said first ground plane; a patch radiative element spaced from said first ground plane and configured to radiate said second rf signal; and a transmission line positioned between said first and second ground planes to carry said first and second rf signals; wherein; said first ground plane is configured to define first and second apertures; one of said first and second ground planes is configured to define a first slot radiative element; said first slot radiative element is configured to radiate said first rf signal with linear polarization and is positioned to couple said first rf signal between said transmission line and free space; and said first and second apertures are each configured and positioned to couple said second rf signal between said transmission line and said patch radiative element for elliptically-polarized radiation. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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1 and λ
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28. A dual-frequency antenna for operation with first and second rf signals which respectively have λ
-
1 and λ
2 wavelengths, comprising;slot radiator configured to radiate said first rf signal with linear polarization; a patch radiator spaced from said slot radiator and configured to radiate said second rf signal with elliptical radiation; and a transmission line configured to carry said first and second rf signals and arranged to coupled said first rf signal to said slot radiator and to couple said second rf signal to said patch radiator; and further including a ground plane and wherein; said slot radiator includes a slot radiative element formed by said ground plane to have a length of substantially λ
1 /2;said transmission line is spaced from a first side of said ground plane; said slot radiative element is positioned to couple said first rf signal between said transmission line and free space; said patch radiator includes; a) first end second apertures formed by said ground plane; and b) a patch radiative element spaced from a second side of said ground plane and having length of substantially λ
2 /2; andsaid first and second apertures are positioned to couple said second rf signal between said transmission line and said patch radiative element.
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1 and λ
Specification