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A conformal ultra wide band(UWB) antenna with a back reflector has been used as a main sensor of a short distance link for breast tumor detection. A two sets of conformal antenna act as a UWB link by emitting a Rayleigh pulse through the breast tissue model and after receiving the pulse by other conformal antenna we observe that the received pulse for tumor diameter size more than 6mm has been changed...
Reconfigurable surface acoustic wave (SAW) filters are presented for the 700 MHz frequency band currently allocated to Long Term Evolution (LTE). Unlike traditional SAW filters with a fixed center frequency, the proposed filters have a reconfigurable center frequency. First, a novel modular ladder type topology is proposed incorporating SAW resonators and GaAs Single Pole Single Throw (SPST) switches...
This work presents a physical compact model for AlGaN/GaN HEMT devices. An analytical model of the drain current has been developed based on models of the charge density in the 2DEG channel but considering only a single energy level. The approach resulted in an accurate and simple current model. The model covers all the different operation regions of a device. Excellent agreements with measured I–V...
This paper, for the first time, presents a new technique to overcome the problems of realizing multiple band rejection notches in high-order miniaturized UWB filters employing the E-shape microstrip structure. The new technique employs double layer substrate where on the bottom layer the main filter is developed and on the top the circuit for band rejection notches is etched. These two filter circuits...
This paper presents the design of an electrically small, 3-D cube antenna that is fabricated using laser-based layer-by-layer stereolithography processing (SLA). The antenna consists of a balun and a half-wave dipole with meandered-line portions, all of which are patterned on the surface of a cube. The antenna operational frequency is 2.45 GHz and its measured 10 dB return loss bandwidth is 3.75%...
Microwave imaging (MI) has been widely studied for cancer detection recently. In this technique, either an array or a scanning antenna is used. Employing an array has the advantage of avoiding the mechanical issues of a scanning antenna. Moreover, a scanning antenna is not a practical arrangement for self-examination purposes. However, designing the array still remains an important topic in MI. In...
A 90GHz power amplifier implemented with three series-connected (stacked) FETs in 45-nm SOI CMOS is reported. Stacking FETs allows increasing voltage handling capability of circuits with highly scaled CMOS transistors. This work shows for the first time that the stacking strategy is effective up to W band. The amplifier achieves power gain of 8 dB at 91 GHz with 3 dB bandwidth of 18 GHz using a supply...
A Class-E power amplifier has been designed to operate at 2.5 GHz using a commercial, packaged GaAs pHEMT. The design approach used a novel analysis of the package impedances. The objective was to present optimal harmonic loads to the transistor, using lumped-component matching on commercial PCB material. Using an MRFG35010 plastic packaged transistor, a drain efficiency of 72% with about 3 W output...
In order to overcome the current limitations of metallic systems for microwave applications, columnar arrays of Co nanowires with variable wire lengths were electrochemically grown using anodic alumina membranes with thickness of ∼100 µm and pore diameters around 70 nm. The Co nanowires tend to present a strong hcp-magnetocrystalline anisotropy directed in the plane perpendicular to the wires axis...
We have proposed an 3 GHz band High-Tc superconducting (HTS) multichannel receiving unit with 8 receiving modules. Each module consists of a small HTS filter and a cooled low noise amplifier (LNA). The HTS filter consists of a number of inter-digital hairpin microstrip line resonators. The module size realize 22×29.5 mm and vacuum chamber size of the HTS multichannel receiving unit realize 152×180×119...
Continuous-wave (CW) radar sensor has been used for monitoring physiological signals of respiration and heartbeat. Complete respiration pattern monitoring is of vital importance in motion-adaptive cancer radiotherapy which strictly relies on the respiration pattern to generate gating signals and track the tumor motion. However, the conventional AC-coupled radar sensor is subject to signal distortion...
Effective training and accurate interpretation of canine behaviors are essential for dog welfare and to obtain the maximum benefits provided by working dogs. We are developing a canine body area network based interface to incorporate electronic sensing and computational behavior modeling into canine training, where computers will be able to provide real time feedback to trainers about canine behavior...
A dual band electrically small folded ellipsoidal helix antenna (EHA) is designed for the wireless data communication and wireless power transferring functions of an artificial cardiac pacemaker. In this design, a spatially non-uniform pitch ellipsoidal helix structure is used to tune the dual resonant frequencies to the desired bands at 900 MHz and 2.4 GHz. Measurement on an wire antenna fabricated...
Most traditional underwater communication systems rely upon low data-rate acoustic communications, which cannot propagate behind objects and is confined to very narrow-band channels. We propose an alternative method supporting robust broadband radio frequency (RF) communications in low signal-to-noise ratio (SNR) undersea environments. This paper presents an integrated treatment involving broadband...
Experimental results of contactless and label-free characterization techniques of cell cultivation are presented. The two demonstrated approaches are compared at two frequencies, 7 GHz and 240 GHz in terms of sensitivity and applicability. At 7 GHz, measurements have been performed using a rat-race based characterizing system. Furthermore, the sensitivity of spectroscopy measurements at 240 GHz has...
Progress in pharmaceutical and biotechnological research relies on the availability of a variety of analytical measurement tools. In this paper we discuss the progress on our research in the field of a novel real-time label-free, and immobilization-free integrated sensor in silicon for monitoring biological substances in nano-liter liquids flowing through a capillary tube. The performance of various...
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