Low power switched diversity antenna system
First Claim
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1. A low power switched diversity antenna system for intercepting electromagnetic radiation at a desired frequency, comprising:
- a first varactor tuned antenna comprisinga first antenna element that intercepts a first polarized component of the electromagnetic radiation, anda first varactor coupled to the first antenna element, wherein the first varactor tunes the first varactor tuned antenna to the desired frequency in response to a first value of a first bias and tunes the first varactor tuned antenna to a rejection frequency in response to a second value of the first bias; and
a second varactor tuned antenna coupled to the first varactor tuned antenna, comprisinga second antenna element oriented such that the second varactor tuned antenna responds to a second polarized component of the electromagnetic radiation that is essentially orthogonally polarized with respect to the first polarized component, anda second varactor coupled to the second antenna element, wherein the second varactor tunes the second varactor tuned antenna to the desired frequency in response to a first value of a second bias and tunes the second varactor tuned antenna to a rejection frequency in response to a second value of the second bias.
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Abstract
A low power switched diversity antenna system (200) includes two varactor tuned antennas (205, 207), each including an antenna element (505) and a varactor (515). The varactor tuned antennas intercept components of electromagnetic radiation that are substantially orthogonally polarized. One of the varactor tuned antennas is tuned to a desired frequency and the other is detuned, achieving a relative gain of the tuned varactor tuned antenna to the detuned varactor tuned antenna of at least 3 dB at the desired frequency.
51 Citations
18 Claims
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1. A low power switched diversity antenna system for intercepting electromagnetic radiation at a desired frequency, comprising:
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a first varactor tuned antenna comprising a first antenna element that intercepts a first polarized component of the electromagnetic radiation, and a first varactor coupled to the first antenna element, wherein the first varactor tunes the first varactor tuned antenna to the desired frequency in response to a first value of a first bias and tunes the first varactor tuned antenna to a rejection frequency in response to a second value of the first bias; and a second varactor tuned antenna coupled to the first varactor tuned antenna, comprising a second antenna element oriented such that the second varactor tuned antenna responds to a second polarized component of the electromagnetic radiation that is essentially orthogonally polarized with respect to the first polarized component, and a second varactor coupled to the second antenna element, wherein the second varactor tunes the second varactor tuned antenna to the desired frequency in response to a first value of a second bias and tunes the second varactor tuned antenna to a rejection frequency in response to a second value of the second bias. - View Dependent Claims (2, 3, 4, 5, 6, 15)
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7. A portable electronic device comprising a low power switched diversity antenna system for intercepting electromagnetic radiation at a desired frequency, comprising:
a first varactor tuned antenna comprising a first antenna element that intercepts a first polarized component of the electromagnetic radiation, and a first varactor couDled to the first antenna element, wherein the first varactor tunes the first varactor tuned antenna to the desired frequency in response to a first value of a first bias and tunes the first varactor tuned antenna to a reiection frequency in response to a second value of the first bias; and a second varactor tuned antenna coupled to the first varactor tuned antenna, comprising a second antenna element oriented such that the second varactor tuned antenna responds to a second polarized component of the electromagnetic radiation that is essentially orthogonally polarized with respect to the first polarized component, and a second varactor coupled to the second antenna element, wherein the second varactor tunes the second varactor tuned antenna to the desired frequency in response to a first value of a second bias and tunes the second varactor tuned antenna to a reception frequency in response to a second value of the second bias. - View Dependent Claims (8, 16)
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9. A low power switched diversity antenna system for intercepting electromagnetic radiation at a desired frequency, comprising:
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a first varactor tuned antenna comprising a first antenna element that intercepts a first polarized component of the electromagnetic radiation, and a first varactor coupled to the first antenna element that is tuned by a first bias; and a second varactor tuned antenna coupled to the first varactor tuned antenna, comprising a second antenna element oriented such that the second varactor tuned antenna responds to a second polarized component of the electromagnetic radiation that is essentially orthogonally polarized with respect to the first polarized component, and a second varactor coupled to the second antenna element that is tuned by a second bias, wherein when the first bias is in a first state and the second bias is in a second state, a ratio of a gain of the first varactor tuned antenna to the second varactor tuned antenna is at least 3 dB, and wherein when the second bias is in a first state and the first bias is in a second state, the ratio of the gain of the first varactor tuned antenna to the second varactor tuned antenna is less than -3 dB. - View Dependent Claims (10, 11, 12, 13, 17)
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14. A portable electronic device comprising a low power switched diversity antenna system for intercepting electromagnetic radiation at a desired frequency, comprising:
a first varactor tuned antenna comprising a first antenna element that intercepts a first polarized component of the electromagnetic radiation, and a first varactor coupled to the first antenna element that is tuned by a first bias; and a second varactor tuned antenna coupled to the first varactor tuned antenna, comprising a second antenna element oriented such that the second varactor tuned antenna responds to a second polarized component of the electromagnetic radiation that is essentially orthogonally polarized with respect to the first polarized component, and a second varactor coupled to the second antenna element that is tuned by a second bias, wherein when the first bias is in a first state and the second bias is in a second slate, a ratio of a gain of the first varactor tuned antenna to the second varactor tuned antenna is at least 3 dB, and wherein when the second bias is in a first state and the first bias is in a second state, the ratio of the gain of the first varactor tuned antenna to the second varactor tuned antenna is less than -3 dB. - View Dependent Claims (18)
Specification