Abstract: A wearable device includes a nonconductive base, a metal loop, and a matching circuit. The nonconductive base substantially has a hollow structure. The metal loop is disposed on the nonconductive base, and has a feeding point and a grounding point. The metal loop has at least one notch. The grounding point of the metal loop is coupled through the matching circuit to a ground voltage. An antenna structure of the wearable device is formed by the metal loop and the matching circuit.

Abstract: A multiband switchable antenna structure includes a feeding element, a first radiation element, a second radiation element, circuit branches, and a switch circuit. A first end of the feeding element is a feeding point. A first end of the first radiation element is coupled to a second end of the feeding element. A second end of the first radiation element is open. A first end of the second radiation element is coupled to the second end of the feeding element. The circuit branches have different impedance values. The switch circuit selects one of the circuit branches as a matching branch according to a control signal. A second end of the second radiation element is coupled through the matching branch to a ground voltage.

Abstract: A wearable device includes a nonconductive base, a metal loop, and a matching circuit. The nonconductive base substantially has a hollow structure. The metal loop is disposed on the nonconductive base, and has a feeding point and a grounding point. The metal loop has at least one notch. The grounding point of the metal loop is coupled through the matching circuit to a ground voltage. An antenna structure of the wearable device is formed by the metal loop and the matching circuit.

Abstract: A communication device includes a radiation element, an RF (Radio Frequency) choke element, a DC (Direct Current) block element, an SAR (Specific Absorption Rate) sensor, a transceiver, and a platform. The radiation element has the functions of an antenna and a sensing pad. The radiation element is configured to receive a low-frequency signal and an RF signal. The RF choke element is configured to remove the RF signal. The DC block element is configured to remove the low-frequency signal. The radiation element is coupled through the RF choke element to the SAR sensor. The radiation element is further coupled through the DC block element to the transceiver. The platform is coupled to the SAR sensor and the transceiver.

Abstract: An electric energy meter for a poly-phase electricity network includes a power transformer having a primary side and a secondary side, a first analog front end (AFE) unit is coupled to the secondary side of the power transformer, and a microcontroller coupled to the primary side of the power transformer. The first AFE unit is to be coupled to a first phase of the poly-phase electricity network. The microcontroller is configured to transmit a digitized request signal to, and to receive a measurement signal from, the first AFE unit via the power transformer. More specifically, the first AFE unit, upon receiving the digitized request signal, is to extract information from the digitized request signal.

Abstract: A multiband switchable antenna structure includes a feeding element, a first radiation element, a second radiation element, circuit branches, and a switch circuit. A first end of the feeding element is a feeding point. A first end of the first radiation element is coupled to a second end of the feeding element. A second end of the first radiation element is open. A first end of the second radiation element is coupled to the second end of the feeding element. The circuit branches have different impedance values. The switch circuit selects one of the circuit branches as a matching branch according to a control signal. A second end of the second radiation element is coupled through the matching branch to a ground voltage.

Abstract: A wearable device includes a nonconductive base, a metal loop, a metal connection element, and a matching circuit. The nonconductive base substantially has a hollow structure. The metal loop is disposed on the nonconductive base. The metal loop has a feeding point. The metal loop is coupled through the metal connection element and the matching circuit to a ground voltage. The antenna structure of the wearable device is formed by the metal loop, the metal connection element, and the matching circuit.

Abstract: A method and system for simple and efficient recycling of entity IDs in a network may rely upon two tables storing records associated with a particular entity ID while avoiding the use of timestamps or a common time source. A first table may store X number of records associated with active entities, including active entity IDs. A second table, referred to herein as an entity ID table, may store Y number of records associated with deactivated entities, including available entity IDs for reuse and a delete index, which may record an ordinal value associated with deactivated entity IDs. The two tables may enable fast and computationally efficient recycling of entity IDs without having to perform costly sorting operations and without the use of timestamps or a common time source.

Abstract: A handheld electronic device comprises a housing, a receiver, a balance antenna and a body. The housing comprises a top end and a bottom end. The receiver is located in the housing and near the top end, and the balance antenna is located in the housing and near the bottom end. The body is located in the housing and electrically couples to the receiver and the balance antenna.

Abstract: A handheld electronic device comprises a housing, a receiver, a balance antenna and a body. The housing comprises a top end and a bottom end. The receiver is located in the housing and near the top end, and the balance antenna is located in the housing and near the bottom end. The body is located in the housing and electrically couples to the receiver and the balance antenna.