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Electromagnetic wireless resonant energy links (WREL) can also be realized by using resonant coils coupled via their evanescent fields. In this paper we propose a new structure for WREL and illustrate the similarities and the differences of CAD of WREL with resonant coils and RFID working at 13.56 MHz. An experimental set-up for WREL with resonant coils is realized and its equivalent network, working...
The use of Radio Frequency Identification (RFID) technology for the automatic transmission of physical parameters in wireless sensor networks paves the way to a large class of attractive applications. Nevertheless, although some RFID tags capable to transmit sensor- like information are already on the market, only a limited number of sensors, such as those for temperature or pressure measurement,...
This paper presents a new dual-band rat-race balun structure for microwave circuit designs and applications. The methodology of designing the dual-band rat-race calls for conventionally designing it at the higher frequency (f1) using distributed components and augmenting the resulting design by adding resonators connected to open stubs to achieve as well as good performance at the lower frequency...
In this paper we introduce a novel technique to overcome the drawbacks of passive tuners and active loops when characterizing very high power transistors and amplifiers. The methodology combines a passive tuner and an active loop, the former used to tune the fundamental output impedance of a device under test, the latter exploited to change its harmonic termination. Since the passive tuner changes...
This paper presents the design and measurement results of an intrinsically switchable interdigitated contour mode resonator based on barium titanate (BTO) thin films. The device exhibits quality factors of 178 and 152 at series and parallel resonance frequencies of 1.67 and 1.68 GHz, respectively, with the application of a 10 V dc bias. Resonances are turned off without the application of dc bias...
The RF performance of a new K-Band helix conduction cooled traveling-wave tube amplifier (TWTA), is presented in this paper. A total of three such units were manufactured, tested and delivered. The first unit is currently flying onboard NASA's Lunar Reconnaissance Orbiter (LRO) spacecraft and has flawlessly completed over 2000 orbits around the Moon. The second unit is a proto-flight model. The third...
A fully integrated 0.18-μm CMOS receiver front-end for UWB system is implemented. This receiver enables 11 bands of operation covering 3.1 to 10.6-GHz with embedding a tunable notch filter to eliminate interferer at 5-GHz wireless local area network (WLAN). The LNA employs a common-gate topology of 1st stage with dual-resonant loads, a cascode amplifier of 2nd stage for mid-band resonance and tunable...
In this paper, a novel Ka-band receiver front-end that integrates a substrate integrated waveguide based slot array antenna, a band-pass filter and a second-harmonic self-oscillating mixer, is presented as an effort to establish a compact, low-cost and low profile architecture for millimetre-wave wireless systems. Our proposed self-oscillating mixer makes use of the transmission characteristics of...
This paper deals with the synthesis and realization of a UWB filter in the [3.168, 4.752] GHz band using a thin film IPD technology and a 4th order Chebyshev cross-coupled architecture that allows us to introduce two finite transmission zeroes out of band. In order to realize this filter, three approaches of realization were considered. The first approach was a classical use of the available technology,...
Generalized composite right/left handed (CRLH) transmission lines are implemented in a fully planar configuration in coplanar waveguide (CPW) technology. These artificial lines exhibit two left handed and two right handed transmission bands alternating, and are therefore of interest for the synthesis of quad-band microwave components. The lines are implemented by loading a host CPW with open split...
A novel experimental approach is proposed to characterize the dispersion properties of radio frequency (RF) waves in metamaterial structures. The approach is based on wave analyses in the space domain and is provided by RF wave visualization through the live electro-optic imaging scheme. It was successfully demonstrated to visualize forward/backward RF waves in composite right/left-handed transmission...
A novel ultra wideband (UWB) power divider is proposed in this paper. A design of the power divider is based on coupled transmission lines and it has been implemented using low temperature cofired ceramic (LTCC) technology. The power divider provides a function over the whole UWB bandwidth (3.1 – 10.6GHz). In contrary to commonly used coupled line splitters, the design doesn't requires infinite increasing...
Geometric characteristics of quasi-TEM waveguides with dipole-FSS walls are presented and investigated. Simulation results show that their dispersion relationship is not sensitive to the geometry of patch and slot in the propagating direction, but very sensitive to the geometry along the transverse direction. This phenomenon can be explained with equivalent magnetic current distributions in the slots...
This paper presents recent advances is a new waveguiding technology referred to as ridge gap waveguides. The main advantages of the ridge gap waveguides compared to hollow waveguides are that they are planar and much cheaper to manufacture, in particular at high frequencies such as for millimeter waves. In these waveguides there are no mechanical joints. The gap waveguides have lower losses than microstrip...
A leaky wave antenna based on a composite right/left-handed waveguide structure is presented. The antenna features beam steering capabilities for a fixed operation frequency of 7.5GHz. The frequency independent tunability is obtained by inclusion of liquid crystal material whose dielectric properties can be tuned by external electric and magnetic fields. Simulations as well as measurements of a built...
A new and simple surrogate modeling technique for microwave devices is presented. Our method exploits a recently introduced shape-preserving response prediction procedure that allows us to estimate the response (e.g., S-parameters over certain frequency range) of the computationally expensive microwave structure by examining the response of the computationally cheap (e.g., circuit equivalent) model...
This paper presents a novel numerical scheme for the extraction of dielectric material parameters using the transmission line method. This method is performed by formulating the discretized Maxwell equations as an eigenpermittivity, permeability or an eigenconductivity problem of the considered sample within an arbitrary and generally inhomogeneous filled waveguide cross section. This allows the direct...
Filters based on Bulk Acoustic Wave (BAW) resonators present very good performance, small size and compatibility with the standard IC technology processes. However, the traditional configurations of such filters present only one frequency transmission band. In this work, a configuration based on electrically coupled BAW resonators has been developed in order to obtain a dual-band response, where each...
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