Abstract:
A radiofrequency (RF) system may comprise a duplexer or multiplexer, e.g., when the transmitted signal frequency is different from the receiving frequency in a RF communication system, a duplexer may combine the transmitter and the receiver into the same antenna. In other possible RF communication systems, where the transmit (Tx) and receive (Rx) paths utilize the same frequencies (which are duplexed in time domain), a multiplexer may be used to connect different transmitters, receivers and/or transceivers that are using different frequencies, into one common/antenna port. A multiplexer may be used to share an antenna between multiple transceivers at different frequencies. In some embodiments, the multiplexer may be tunable to different frequencies during operation.
Abstract:
A cavity device is disclosed comprising a plurality of flat boards stacked one on lop of the other to form a multilayered structure. At least some of the flat boards comprise at least one opening or perforations having one or more layers of electrically conducting materials configured to establish electrical conduction with one or more layers of electrically conducting materials of another one of the flat boards, to thereby form electrically conducting patterns in the multilayered structure for interacting with electromagnetic radiation introduced into the cavity device.
Abstract:
Optical distributed antenna systems comprising a head-end unit adapted to transmit downlink a modulated optical signal with wavelength λ0 and N un-modulated optical signals with wavelength λN and N remote units (RU) and including at least one circulator. In some embodiments, an HE unit includes an arrangement of a single circulator coupled to a single detector, the arrangement preventing beating. In some embodiments, a RU includes a reflective electro-absorption transceiver (REAT) which includes a single optical interface and a single RF port. The REAT detects the optical signal with λ0 and converts it into a RF signal, and reflects an un-modulated optical signal with wavelength λN to provide a modulated uplink optical signal. In some embodiments, a RU is configured as an optical antenna unit. In some embodiments, a plurality of RUs is combined with passive optical distribution units to provide hierarchical DAS architectures.
Abstract:
Optical distributed antenna systems comprising a head-end unit adapted to transmit downlink a modulated optical signal with wavelength λ0 and N un-modulated optical signals with wavelength λN and N remote units (RU) and including at least one circulator. In some embodiments, an HE unit includes an arrangement of a single circulator coupled to a single detector, the arrangement preventing beating. In some embodiments, a RU includes a reflective electro-absorption transceiver (REAT) which includes a single optical interface and a single RF port. The REAT detects the optical signal with λ0 and converts it into a RF signal, and reflects an un-modulated optical signal with wavelength λN to provide a modulated uplink optical signal. In some embodiments, a RU is configured as an optical antenna unit. In some embodiments, a plurality of RUs is combined with passive optical distribution units to provide hierarchical DAS architectures.
Abstract:
A cavity device is disclosed comprising a plurality of flat boards stacked one on lop of the other to form a multilayered structure. At least some of the flat boards comprise at least one opening or perforations having one or more layers of electrically conducting materials configured to establish electrical conduction with one or more layers of electrically conducting materials of another one of the flat boards, to thereby form electrically conducting patterns in the multilayered structure for interacting with electromagnetic radiation introduced into the cavity device.
Abstract:
A micro handheld alarm network system for alerting to any lose of a network entity is presented herein. The micro handheld alarm network system contains several system elements first type which communicate between them by means of wireless communication first type protocols such as a Zigbee (IEEE 802.15.4 standard). The Zigbee standard includes a method of determining the distance between every two system elements within the micro handheld network. The micro handheld alarm network system can also include at least one system elements second type, which can, in addition, communicate by means of wireless communication second type protocols, such as Bluetooth and Wifi. By monitoring such distances, the system elements may decide if one or more of the system elements are drawn away from the other system elements, thereby alerting the user of such occurrence.