Ajustable antenna
First Claim
Patent Images
1. An antenna comprising:
- a set of at least two antenna coils;
a bank of at least two capacitors; and
a switching arrangement,wherein the switching arrangement is selectably configurable to define at least two operating modes, in which different combinations of antenna coils and capacitors are selectably connected into circuit, wherein the different combinations of antenna coils and capacitors, define the same operating frequency in the two operating modes but with a different number of antenna coils for the respective operating modes, and wherein the operating modes comprise different power consumption modes of operation, corresponding to respective different amounts of power from the use of the set of antenna coils to generate a magnetic field, wherein in a first of the operating modes, a first current is provided to a first set of a first number of antenna coils for consumption by the first set, and wherein in a second of the operating modes, a second current, higher than the first current, is provided to a second set of a second number of antenna coils, wherein the second number of antenna coils is lower than the first number of antenna coils.
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Abstract
The invention provides an antenna which can be configured to use s selected number of coils but for the same operating frequency. This enables a desired (and adjustable) compromise to be found between power consumption and signal strength.
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Citations
17 Claims
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1. An antenna comprising:
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a set of at least two antenna coils; a bank of at least two capacitors; and a switching arrangement, wherein the switching arrangement is selectably configurable to define at least two operating modes, in which different combinations of antenna coils and capacitors are selectably connected into circuit, wherein the different combinations of antenna coils and capacitors, define the same operating frequency in the two operating modes but with a different number of antenna coils for the respective operating modes, and wherein the operating modes comprise different power consumption modes of operation, corresponding to respective different amounts of power from the use of the set of antenna coils to generate a magnetic field, wherein in a first of the operating modes, a first current is provided to a first set of a first number of antenna coils for consumption by the first set, and wherein in a second of the operating modes, a second current, higher than the first current, is provided to a second set of a second number of antenna coils, wherein the second number of antenna coils is lower than the first number of antenna coils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communications apparatus comprising:
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an antenna that includes; a set of at least two antenna coils; a bank of at least two capacitors; and a switching arrangement that is configurable to define at least two operating modes, in which different combinations of the antenna coils and the capacitors are connected in respective operating modes, wherein the different combinations of antenna coils and capacitors have the same operating frequency; and a controller circuit configured to; select between the at least two operating modes of the antenna, provide, in a first of the operating modes, a first current to a first number of antenna coils; and provide, in a second of the operating modes, a second current, higher than the first current, to a second number of antenna coils, lower than the first number of antenna coils. - View Dependent Claims (11)
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12. A method of setting an operating mode of an antenna, which comprises a set of at least two antenna coils, a bank of at least two capacitors and a switching arrangement, the method comprising:
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configuring the switching arrangement to define a selected one of at least two selectably operating modes, in which different operating modes, a different combination of antenna coils and capacitors is connected into circuit, wherein the different combinations of antenna coils and capacitors define the same operating frequency in two operating modes but with a different number of antenna coils, and wherein the operating modes comprise different power consumption modes of operation, the power consumption modes each consuming a different amount of power from the use of the set of antenna coils to generate a magnetic field; and changing an amount of current through the antenna for a first one of the power consumption modes relative to an amount of current through the antenna for a second one of the power consumption modes, wherein fewer antenna coils are connected in the first one of the power consumption modes than in the second one of the power consumption modes. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification