A bar code reading terminal can, in one embodiment, include a two-dimensional image sensor and an imaging assembly. The terminal can be configured, in response to receipt of a trigger signal, to buffer a set of frames and subject each frame of the set of frames to a decode attempt. The terminal can also be configured to convert the convert the captured set of video frames into a compressed video format, and transfer the resulting video file to a file server or to one or more playback devices, in response to a user interface action, or in response to difficult read condition having been detected. The terminal can also be configured to establish two-way video- and audio-communication with a remote video- and audio-streaming device. The video capturing and streaming operation of the terminal can be controlled remotely from a playback device via web interface.

Bar code reading terminal with video capturing mode

An encoded information reading (EIR) terminal can comprise a microprocessor electrically coupled to a system/data bus, a memory communicatively coupled to the microprocessor, an EIR device, a multi-band antenna, and a wireless communication interface. The EIR device can be provided by a bar code reading device, an RFID reading device, or a card reading device. The EIR device can be configured to output raw message data containing an encoded message and/or output decoded message data corresponding to an encoded message. The wireless communication interface can comprise a radio frequency (RF) front end electrically coupled to the multi-band antenna. The RF front end can comprise a micro-electromechanical (MEMS) filter array including one or more band-pass filter. Each band-pass filter of the MEMS filter array can be electrically coupled to a bias voltage source or an oscillating signal source. The RF front end can be electrically coupled to an analog-to-digital (A/D) converter and/or to a digital-to-analog (D/A) converter. The wireless communication interface can be configured to transmit radio signals in two or more frequency regulatory domains and/or receive radio signals in two or more frequency regulatory domains. The multi-band antenna can in one embodiment be provided by a meta-material antenna.

Encoded information reading terminal with micro-electromechanical radio frequency front end

Understand the fundamentals of wireless and MIMO communication with this accessible and comprehensive text. Viewing the subject through an information theory lens, but also drawing on other perspectives, it provides a sound treatment of the key concepts underpinning contemporary wireless communication and MIMO, all the way to massive MIMO. Authoritative and insightful, it includes over 330 worked examples and 450 homework problems, with solutions and MATLAB code and data available online. Altogether, this is an excellent resource for instructors and graduate students, as well as an outstanding reference for researchers and practicing engineers.

Foundations of MIMO Communication

A near object detection (NOD) system includes a plurality of sensors, each of the sensors for providing detection coverage in a predetermined coverage zone and each of the sensors including a transmit antenna for transmitting a first RF signal, a receive antenna for receiving a second RF signal and means for sharing information between each of the plurality of sensors in the NOD system.

Near object detection system

In this letter, a modified antipodal Vivaldi antenna is presented. A novel tapered slot edge (TSE) structure is employed in this design. The proposed TSE has the capacity to extend the low-end bandwidth limitation and improve the radiation characteristics in the lower frequencies. A prototype of the modified antenna is fabricated and experimentally studied as well. The measured results show reasonable agreement with the simulated ones that validate the design procedure and confirm the benefits of the modification.

A Miniaturized Antipodal Vivaldi Antenna With Improved Radiation Characteristics

A method and a system for calibrating at least one antenna (1,1-1,3. 1,j). At least a first antenna (1,4) within a first antenna array (102) can be selected as a primary reference antenna. At least one antenna (4,3) that is not within the first antenna array can be selected as a secondary reference antenna. At least a first signal propagation characteristic (122) can be measured based on at least one signal wirelessly communicated between the primary reference antenna and the secondary reference antenna. At least a second signal propagation characteristic (118) can be measured based on at least one signal wirelessly communicated between the secondary reference antenna and at least a second antenna (1,2) within the first antenna array. At least a first calibration coefficient can be determined for the second antenna.

Antenna reciprocity calibration

A full-wave method of moments solution for infinite arrays of stripline-fed tapered slot antennas is described The formulation of the problem is sufficiently general to permit performance evaluation of most of the geometries that have been proposed for stripline-fed antennas as well as of several other types of array antennas Computed results for some well-known antenna arrays are presented to demonstrate the validity and accuracy of the method Excellent agreement with published results has been obtained for scattering from corrugated surfaces and grounded dielectric slabs and for the input impedance of dipole and monopole arrays Catastrophic effects such as scan blindness are accurately predicted A sample result showing the measured and computed input impedance of a stripline-fed tapered slot antenna array is also presented >

Moment method analysis of infinite stripline-fed tapered slot antenna arrays with a ground plane

The authors report on the radiation from infinite dipole arrays printed on ferrite substrates. Ferrite materials offer unique design capabilities at microwave frequencies because some of their properties depend on the DC magnetic field applied to them. The performance of an array of printed elements depends strongly on, among other things, the modes supported by the substrate. The nature of grounded ferrite substrate modes and their relation to the scan performance of dipole arrays printed on such ferrite substrates are described. Both in-plane and perpendicular bias are considered, and a scheme of dynamic ferrite biasing is outlined resulting in unique scan performance and a 16% frequency agility of ferrite substrate dipole arrays. >

Dipole arrays printed on ferrite substrates

A passive repeater includes: a connecting transmission circuit having first and second opposing ends and made of a flexible material for substantially conforming to a portion of a structure, the structure having first and second opposing sides; first and second antenna elements respectively coupled to the first and second opposing ends of the connecting transmission element; and first and second affixing elements respectively coupled to the first and second antenna elements for attaching the first and second antenna elements to the first and second opposing sides of the structure, wherein the first and second antenna elements are operable to transfer a signal from the first opposing side of the structure to the second opposing side of the structure via the connecting transmission circuit.

Passive repeater for radio frequency communications

Using a Green's function approach, similar to that used to treat scattering from underground tunnels, the problem is considered of electromagnetic scattering from conducting wires buried in the earth. The method leads to an integral equation for the unknown surface current J(ř) of the conducting cylinder. The expansion of J(ř) in terms of surface cylindrical wavefunctions and substitution in the integral equation results in an infinite set of linear equations for the unknown expansion coefficients. An effective truncation algorithm has been employed to evaluate these coefficients and, afterwards, the scattered field. Numerical results for the far-field region of the buried scatterer are plotted and some useful conclusions based on them are discussed.

Scattering from conducting cylinders embedded in a lossy medium

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