Compact microstrip transponder antenna
First Claim
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1. A transponder for use in an electronic toll collection (ETC) system, the transponder operating using radio frequency (RF) signals, the transponder comprising:
- a circuit substrate having a longitudinal axis and having a transverse axis perpendicular to the longitudinal axis;
a ground plane formed on the circuit substrate;
a planar antenna formed on the circuit substrate;
an RF transceiver connected to the antenna for receiving RF signals from the ETC system and for sending RF signals to the ETC system;
a controller for controlling the RF transceiver in accordance with an ETC communication protocol; and
a battery for supplying DC power to the controller and the RF transceiver, wherein the antenna is disposed on one side of the transverse axis and the controller, the battery, and the RF transceiver are disposed on the other side of the transverse axis, wherein the antenna is arranged in an antenna pattern, and wherein the ground plane includes at least three connected segments and is disposed on at least three sides of the antenna pattern.
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Abstract
A transponder formed on a circuit substrate having a longitudinal axis and a transverse axis. An antenna is disposed on one side of a transverse axis, extending in a longitudinal direction, and the remaining circuit components are disposed on the other side of the transverse axis. The remaining circuit components may include a controller, an RF transceiver, and a battery. A ground plane defines an antenna space within which the antenna is disposed.
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Citations
20 Claims
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1. A transponder for use in an electronic toll collection (ETC) system, the transponder operating using radio frequency (RF) signals, the transponder comprising:
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a circuit substrate having a longitudinal axis and having a transverse axis perpendicular to the longitudinal axis;
a ground plane formed on the circuit substrate;
a planar antenna formed on the circuit substrate;
an RF transceiver connected to the antenna for receiving RF signals from the ETC system and for sending RF signals to the ETC system;
a controller for controlling the RF transceiver in accordance with an ETC communication protocol; and
a battery for supplying DC power to the controller and the RF transceiver, wherein the antenna is disposed on one side of the transverse axis and the controller, the battery, and the RF transceiver are disposed on the other side of the transverse axis, wherein the antenna is arranged in an antenna pattern, and wherein the ground plane includes at least three connected segments and is disposed on at least three sides of the antenna pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transponder for use in an electronic toll collection (ETC) system, the transponder operating using radio frequency (RF) signals, the transponder comprising:
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a circuit substrate having a longitudinal axis and having a transverse axis perpendicular to the longitudinal axis;
a ground plane formed on the circuit substrate;
a planar antenna formed on the circuit substrate, wherein said antenna is disposed along an antenna axis, and wherein said antenna axis extends parallel to said longitudinal axis;
an RF transceiver connected to the antenna for receiving RF signals from the ETC system and for sending RF signals to the ETC system;
a controller for controlling the RF transceiver in accordance with an ETC communications protocol; and
a battery for supplying DC power to the controller and the RF transceiver, wherein the antenna is disposed on one side of the transverse axis and the controller, the battery, and the RF transceiver are disposed on the other side of the transverse axis, wherein the antenna is arranged in an antenna pattern, and wherein the ground plane includes at least three connected segments and is disposed on at least three sides of the antenna pattern.
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17. A transponder for use in an electronic toll collection (ETC) system, the transponder operating using radio frequency (RF) signals, the transponder comprising:
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a circuit substrate having a longitudinal axis and having a transverse axis perpendicular to the longitudinal axis;
a ground plane formed on the circuit substrate and defining an antenna space having ground segments on at least three sides;
a meander-line antenna formed on the circuit substrate within the antenna space and having a longitudinal antenna axis; and
a plurality of circuit components mounted on the circuit substrate for implementing an ETC communications protocol, the circuit components being connected to the antenna for receiving the RF signals, demodulating the RF signals, and exciting the antenna to propagate a response signal, wherein the antenna is disposed on one side of the transverse axis and the plurality of circuit components are disposed on the other side of the transverse axis. - View Dependent Claims (18, 19, 20)
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Specification