In a method for establishing communication between a transaction terminal (1) and a mobile device (2; 6) located within communication range (5), wherein the transaction terminal (1) is able to communicate in an active and in a passive communication mode and wherein the following process steps are performed: activating the passive communication mode in the transaction terminal (1) for a first time range (t3-t4; t7-t8) in order to establish a passive communication of the transaction terminal (1) with a mobile active device (6) possibly located within communication range (5); activating the active communication mode in the transaction terminal (1) for a second time range (t5-t6) in order to establish an active communication of the transaction terminal (1) with a passive mobile device (2) possibly located within communication range (5), if communication with a mobile active device (6) was not established in the first time range (t3-t4; t7-t8); detecting a carrier signal (7) of a mobile active device (6) possibly located outside the communication range (5) during the first time range (t3-t4; t7-t8) as well as during a third time range (t10-t12); remaining in the passive communication mode of the transaction terminal (1) for the third time range (t10-t12), if the carrier signal (7) of the mobile active device (6) has been detected in order to establish a passive communication of the transaction terminal (1) with the mobile active device (6), if the mobile active device (6) gets within communication range (5) during the third time range (t10-t12).

This application discloses a tag quantity estimation system and method of RFID. A processor-readable medium was disclosed at the same time. This estimation method applies a spatial diversity gain existing in a multi-antenna system. Separated and sequentially stacked the real parts and the imaginary parts of the multiple signals received by multiple antennas. Then, a tag quantity estimation problem is converted into a data clustering problem in high-dimensional space. In this way, the overlapped cluster data in low-dimensional space can be separated in the high-dimensional space, thereby improving the accuracy of tag quantity estimation.

An indicia reader can include an indicia-capturing system, an indicia-decoding module, and an audio indicator system having a sound source. An indicia-reader housing can support these components, and the housing includes two adjacent mounting surfaces and a sound port opening formed within a portion of the common edge of the two adjacent surfaces. The indicia reader can be operatively mounted in at least two different positions by attaching one of the two adjacent surfaces to a support structure. The reader's sound port opening is in acoustic communication with the sound source of the audio indicator for transmitting audible indications emitted via the audio indicator system when the indicia reader is mounted in either of the at least two different mounting positions.

In a method for establishing communication between a transaction terminal (1) and a mobile device (2; 6) located within communication range (5), wherein the transaction terminal (1) is able to communicate in an active and in a passive communication mode and wherein the following process steps are performed: activating the passive communication mode in the transaction terminal (1) for a first time range (t3-t4; t7-t8) in order to establish a passive communication of the transaction terminal (1) with a mobile active device (6) possibly located within communication range (5); activating the active communication mode in the transaction terminal (1) for a second time range (t5-t6) in order to establish an active communication of the transaction terminal (1) with a passive mobile device (2) possibly located within communication range (5), if communication with a mobile active device (6) was not established in the first time range (t3-t4; t7-t8); detecting a carrier signal (7) of a mobile active device (6) possibly located outside the communication range (5) during the first time range (t3-t4; t7-t8) as well as during a third time range (t10-t12); remaining in the passive communication mode of the transaction terminal (1) for the third time range (t10-t12), if the carrier signal (7) of the mobile active device (6) has been detected in order to establish a passive communication of the transaction terminal (1) with the mobile active device (6), if the mobile active device (6) gets within communication range (5) during the third time range (t10-t12).

A gaming table includes a network analyzer. The network analyzer detects antenna reflection coefficients faster than RFID tags can be read, enabling game state information to be monitored quickly.

In accordance with an embodiment, a wireless tag reading apparatus includes an antenna, first and second power feeding ports, and a controller. The first power feeding port feeds electric power into the antenna so as to emit the first linearly polarized wave from the antenna. The second power feeding port feeds electric power into the antenna so as to emit the second linearly polarized wave from the antenna. The controller sets a ratio of a time of power feeding from the first power feeding port to a time of power feeding from the second power feeding port to take a value according to a ratio of the number of wireless tags existing in the direction of the first linearly polarized wave to the number of wireless tags existing in the direction of the second linearly polarized wave.

Apparatus and methods are provided for automatically interrogating a tagged object using radio frequency identification (RFID) when the object is moved. In one embodiment, a worker is outfitted with a wearable RFID system including an RF antenna, an RFID reader, and a holder to hold the antenna and reader during operation. The system is worn by the worker while the worker moves objects from one place to another. When the worker moves an object with an attached RFID tag, the antenna automatically begins scanning for signals from the object's RFID tag. When a RF signal is received by the antenna, the RFID reader collects the signal and transmits it to a host system which processes the signal to obtain information related to the object to which the RFID tag is attached.

A card reader auxiliary device and a working method thereof, which relate to the field of card readers. The card reader auxiliary device detects whether a card exists based on contactless field of the card reader, when detecting that the card exists, the card reader auxiliary device opens its own contactless field and provides field strength enough for a fingerprint card to enable the fingerprint card to complete fingerprint comparison, the card reader auxiliary device obtains a current time of a timer, determines whether the current time is more than a first preset time, if yes, the card reader auxiliary device closes its own contactless field. According to the embodiments, the fingerprint comparison can be done by a card without updating the card reader, which can make the card communicate smoothly with the card reader.

Various embodiments are generally directed to techniques communicate in a cellular communication frequency range, detect a resonant signal in response to the communication in the cellular communication frequency range for cellular communication, the resonant signal to indicate presence of a contactless card. Embodiments also include enabling a near-field communication device to send a communication to the contactless card based on the detection of the resonant signal, the near-field communication device to communicate with the contactless card in a near-field communication frequency range.

A position tracking system for Tags to collect relative proximity to other Tags using received signal strength, with methods to reduce power consumption with controlled degradation in overall system performance such as location accuracy and frequency of location updates. Configurable parameters for control of tag functions facilitate performance tradeoffs against application requirements. System architecture using mobile phone and gateway for uploading data enables efficient upload of tag data without user intervention. Applications of the disclosure include self-quarantine, contact tracing, mother-infant pairing, location history tracking, and personnel-asset usage monitoring.