Communication circuit with single element antenna for multi-frequency applications
AssigneeSchlage Lock Company LLC
InventorsRobert Prostko, Ryan C. Kincaid, Brian A. Telljohann
Life of this patent
Estimating the term…
Abstract
A communication circuit according to one embodiment includes a single element antenna, a plurality of signal-limiting circuits, a high-frequency transceiver circuit, and a low-frequency transceiver circuit. The high-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a high frequency carrier frequency, and the low-frequency transceiver circuit is adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a low frequency carrier frequency.
Claims22
A communication circuit, comprising:
- a single element antenna including a first node, a second node, and a third node, wherein a first portion of the single element antenna is defined between the first node and the second node and a second portion of the single element antenna is defined between the second node and the third node;
- a high-frequency transceiver circuit having a first terminal and a second terminal, and wherein the high-frequency transceiver circuit enables wireless communication with a first transponder over a high frequency carrier frequency;
- a low-frequency transceiver circuit having a third terminal and a fourth terminal, and wherein the low-frequency transceiver circuit enables wireless communication with a second transponder over a low frequency carrier frequency;
- a first switch electrically coupled to the first node and configured to be switched between a first state in which the first node is electrically coupled to the first terminal and a second state in which the first node is electrically coupled to the third terminal;
- a second switch electrically coupled to the second node and configured to be switched between an open state and a short state in which the second node is electrically coupled to the second terminal;
- and
- a third switch electrically coupled to the third node and configured to be switched between an open state and a short state in which the third node is electrically coupled to the fourth terminal.
A communication circuit, comprising:
- a single element antenna;
- a plurality of signal-limiting circuits;
- a high-frequency transceiver circuit adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a high frequency carrier frequency;
- and
- a low-frequency transceiver circuit adapted to be selectively coupled to the single element antenna via the plurality of signal-limiting circuits and tuned to operate at a low frequency carrier frequency;
- and
- wherein the single element antenna includes a resonant stub when the high-frequency transceiver circuit is coupled to the single element antenna and the low-frequency transceiver circuit is decoupled from the single element antenna.
(canceled)
(canceled)
A communication circuit for multi-frequency communication, the communication circuit comprising:
- a single element antenna including a plurality of coils, wherein the plurality of coils consists of a first portion of coils and a second portion of coils;
- a plurality of signal-limiting circuits;
- a high-frequency transceiver circuit adapted to be selectively coupled to the single element antenna, via the plurality of signal-limiting circuits, in a first mode of operation of the communication circuit in which wireless communication with a first RF communication device at a high frequency carrier frequency via the single element antenna is enabled;
- and
- a low-frequency transceiver circuit adapted to be selectively coupled to the single element antenna, via the plurality of signal-limiting circuits, in a second mode of operation of the communication circuit in which wireless communication with a second RF communication device at a low frequency carrier frequency via the single element antenna is enabled;
- wherein, in the first mode of operation, the first portion of coils is used for transmitting and receiving the wireless communication with the first RF communication device and the second portion of coils has one or more electromagnetic characteristics of a resonant stub;
- and
- wherein, in the second mode of operation, the first portion of coils and the second portion of coils are used for transmitting and receiving the wireless communication with the second RF communication device.
Dependencies are inferred from the claim text.