The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the following paper, we will examine the implications of sensor fusion (or lack of it) for geophysical, military and medical applications. In many areas, the medical field is surpassing even the military in sophisticated integration of multiple sensors. However its implementation — must be done carefully and correctly in both realms.
A Coordinated Multipoint (CoMP) refers to a system where several geographically distributed antenna nodes coordinate to improve performance of the served users in the coordination area, and are connected to each other through dedicated links. One of the main issues that was identified is the backhaul requirements — the type and amount of data to be exchanged among coordinating nodes. We propose and...
Demonstration of Millimeter Wave (MMW) imaging system using chirp radar method and Glow Discharge Detector (GDD) Focal Plane Array (FPA) is presented. A unique quasi optical set up and advanced detection methods using the GDD are intended to build the 3D MMW imaging system. This quasi optical setup enables to detect the distance and reflection of each point in object in order to reconstruct a 3D MMW...
In this paper, we present a multilayer flat lens antenna with effective zero index. It is made of a multilayer and periodic structure of printed elements to enhance a single patch element gain from 6 dBi to 19 dBi with radiation efficiency close to 85%. This high radiation efficiency enables to reduce the antenna aperture size. In the literature, the concept of a flat lens with zero index fed symmetrically...
Communication and Biomedical industry is in continuous growth in the last decade. Compact tunable antennas are crucial in the development of Communication and wearable biomedical systems. The antenna resonant frequency may be tuned by using a varactor to compensate variations in antenna resonant frequency at different locations on the body. Design considerations, computed and measured results on the...
A cheap matching component for correcting ill-matched antennas is proposed. The component is based on a parasitic longitudinal matching component. It is shown that this component can greatly correct input impedances which deviate from the designed value by −27j to +23j ohms.
The space-based Automatic Identification System (SAT-AIS) is devised to provide identification and position information to vessels for maritime safety and security purposes. The system is intended to operate at VHF through mini-satellite platforms in Low Earth Orbit (LEO). Due to the in-orbit deployment of the antenna array and overall mass requirements for the satellite, the array element minimization...
This paper presents enhanced versions of the two most common drivers used in radio frequency integrated circuits: the common-collector stage and the differential pair. The common-collector stage is extended to a totem pole stage and the differential pair to a multi-tanh structure. A key point is the direct comparison of small-signal and large signal measurement results between the standard architectures...
For the next generation of sensors and communication systems operating at frequencies up to 600 GHz and above, the Fraunhofer IAF is developing a broad variety of millimeter- and submillimeter-wave monolithic integrated circuits (MMICs and S-MMICs) and modules. The monolithic integrated circuits are realized using the advanced metamorphic high electron mobility transistor (mHEMT) technology in the...
We present the results of development of a 3-mm wavelength video imaging system. The external EM radiation is detected with an 8 × 8 detector array illuminated by an aspheric lens, which forms an image, and a digital control unit. Some measured characteristics of the array elements (antenna element patterns, sensitivity, etc.), optical characteristics of the imaging system (point spread function,...
Power Management Integrated Circuits is one of the fastest growing markets in the semiconductor industry, with increasing demand for efficient electronic devices and dense integration schemes. Power over Ethernet designs are some of the most challenging, incorporating multiple channels of large High Voltage FET drivers, along with dense logic cores and high precision analog. The extreme amount of...
A microstrip parasitic patch antenna consisting of four parasitic patches, fed by one active patch, with a stripline input, is presented in this paper. The antenna was designed for the Low Temperature Co-fired Ceramics (LTCC) technology and shows very good matching and radiation behavior in the 77 GHz band, with measured reflection losses lower than − 10 dB between 75.175–80.6 GHz and below − 40 dB...
An IF to RF up-conversion mixer for the entire E-BAND 71–76GHz and 81–86GHz frequency range was designed and fabricated in IBM 0.12μm SiGe technology. The Mixer comprises of a double balanced Gilbert-cell with a degeneration inductor in the amplifying stage for increased linearity. The mixer exhibits conversion gain higher than −2dB, output compression point above −7dBm, and LO leakage less than −30dB...
A novel planar differential ultra-wideband (UWB) antenna was designed and implemented on low-cost FR4 substrate and characterized experimentally. The antenna was used in the implementation of a complete UWB pulse radar sensor obtained by co-integrating a system-on-a-chip UWB pulse radar packaged in QFN32 package with two antennas, one for the transmitter and one for the receiver. The experimental...
Power amplifier is an essential component in communication systems. Digital baseband predistortion is a cost effective approach to linearize a power amplifier. Models derived from Volterra series are often used. For a given type of model, two questions have to be solved: estimation of the model coefficients, and determination of the model structure, e.g. orders of non-linearity, memory lengths, etc...
The high-power operation of a modular and compact power amplifier (PA) is demonstrated using gallium nitride (GaN) transistors and power-combining networks implemented on an aluminum nitride (AlN) substrate. The power-combining network, tuned for X-Band operation, includes matching circuits and Wilkinson power dividers (WPDs) with tantalum nitride (TaN) thin-film resistors. PA efficiency is increased...
This paper presents new 2D and 3D numerical models for surface acoustic wave resonators (SAW) on GaN/Si substrate, working on frequencies above 5 GHz. The interdigital transducers (IDT) have fingers and interdigit spacings of 200nm wide. The simulations are compared with experimental results obtained for one port SAW resonators.
Guided TEM waves have been usually investigated between 2 conductors, but there are many cases which require the analysis of TEM waves guided by many conductors, like flat cables, high frequency polyphase transmission lines, etc. In a previous work I developed a methodology for multiconductor TEM waves, which is in many senses a generalization of the 2 conductors case, but also emphasizes new properties...
Nanosecond pulsed-power generators featuring high peak and average power are attractive for ultra-wideband radars in applications such as through-wall detection and ground penetration. The efficiency of the pulse production scheme has a major importance in battery operated devices. This paper presents an efficiency study of a 2.2-kV, 1 ns pulsed power circuit. The circuit consists of a power MOSFET...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.