Coplanar antenna
In a particular embodiment of the present disclosure, a coplanar antenna includes a conductive plane having a first dimension and a second dimension, wherein the length of the conductive plane along the first dimension is less than one-quarter of a wavelength of a resonant frequency; an insulating region disposed within the conductive plane, wherein the insulating region is of a shape that outlines a conductive peninsula, wherein: the conductive peninsula is coupled to the conductive plane; the conductive peninsula is substantially coplanar to a major portion of the conductive plane; the conductive peninsula is electrically coupled to an electric feed circuit such that an impedance associated with the conductive peninsula when electrically coupled substantially matches a signal impedance at the electrical feed circuit; and the conductive peninsula is operable to resonate at the resonant frequency after receiving a current from the electric feed circuit.
1. A personal sensor bracelet comprising:
a curved conductive band comprising:
a substantially planar portion having a first end and a second end;
a first curved portion extending from the first end of the substantially planar portion;
a second curved portion extending from the second end of the substantially planar portion;
a coplanar antenna incorporated with the conductive band, the coplanar antenna comprising:
a conductive plane having a first dimension and a second dimension, wherein the length of the conductive plane along the first dimension is less than or equal to one-quarter of a wavelength of a resonant frequency, wherein a major portion of the conductive plane is disposed within the substantially planar portion;
an insulating region disposed within the conductive plane, wherein the insulating region is of a shape that outlines a conductive peninsula, wherein:
the conductive peninsula is coupled to the conductive plane;
the conductive peninsula is substantially coplanar to the major portion of the conductive plane;
the conductive peninsula is electrically coupled to an electric feed circuit such that an impedance associated with the conductive peninsula when electrically coupled substantially matches a signal impedance at the electrical feed circuit; and
the conductive peninsula is operable to resonate at the resonant frequency after receiving a current from the electric feed circuit; and
a processor disposed within the substantially planar portion, the processor electrically coupled to the electric feed circuit; and
a plurality of sensors disposed within the substantially planar portion, the plurality of sensors electrically coupled to the processor;
a curved band coupled to the curved conductive band such that the curved band and the curved conductive band form a bracelet, wherein the curved band is removably coupled to the curved conductive band at an end of the first curved portion distal from the substantially planar portion, and the curved band is removably coupled to the curved conductive band at an end of the second curved portion distal from the substantially planar portion.
2. The personal sensor bracelet of claim 1 , wherein the conductive plane is not covered by an insulating radome in operation.
3. The personal sensor bracelet of claim 1 , wherein the conductive plane is at least partially covered by a conductive layer, the conductive layer comprising a different conductive material than the conductive plane.
4. The personal sensor bracelet of claim 1 , wherein the conductive plane and the conductive peninsula are formed from an integral piece of conductive material.
5. The personal sensor bracelet of claim 1 , wherein the insulating region is at least partially filled by a dielectric material.
6. The personal sensor bracelet of claim 1 , wherein the electric feed circuit comprises a tuning circuit operable to electrically compensate for a portion of the wavelength of the resonant frequency.