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.
Up till now, the best linear approximation (BLA) has always been determined in the frequency band where a device-under-test (DUT) operates. For the development of complete high-level design models, however, it is mandatory to know the BLA outside this frequency band. In this paper a measurement technique is proposed to extract the in-band as well as the out-of-band BLA of a nonlinear microwave amplifier...
The application of magnetic powders are becoming attractive in electromagnetic shielding interferences in wireless systems. Magnetic powders such as Fe3O4 are also very important in magnetic resonance imaging as well as drug delivery applications in biomedical researches. Also, some of the special catalyst nano magnetic particles are increasingly useful in the fuel cell applications. Hence, a good...
The complex permittivity of a biological medium used for stem cell culture has been measured from 1 GHz to 20 GHz for the first time. Results for the medium are presented here in comparison with those of distilled water. The determination of spectra for the real and imaginary parts of complex dielectric permittivity of the biological medium will help us further to understand the mechanism of absorption...
This paper presents a new method for the extraction of material parameters, in this case the permittivity, by formulating the Maxwell equations as an eigen-susceptibility problem of the considered sample. This offers a direct solution of the desired material parameters by utilizing adequate and well proven numerical techniques. Hence, it is very useful if analytical approaches do not provide the aimed...
A particulates mass flow meter has been developed using a composite right/left-handed transmission line resonator. The presented sensor principle promises the possibility to design precise particulate solids mass flow meter with moderate costs. The Spatial Filter Velocimetry is applied to the sensor in order to detect the velocity information. The simultaneous detection of the velocity and the solids/air...
In this paper we present a hybrid approach for the measurement of the complex dielectric permittivities of arbitrarily shaped homogeneous dielectric scatterers by using microwaves. The proposed method is organized in two stages: in the first one, the supports of the scatterers are retrieved by means of a new formulation of the linear sampling method, which is based on the no sampling approach; in...
A measurement system based on microwave transition analyzer (MTA) as a receiver is proposed for time domain and frequency domain characterization of linear and non-linear N-port microwave devices. The proposed measurement system is able to perform full S-parameters characterization for N-port devices with only one measurement connection step. The system is also sensitive to the input power variation...
Traditional wireless sensors rely on monolithic transceivers optimizing cost but offering a very low flexibility. On the other hand, microwaves in the GHz range are used for displacement and position sensing. In this work a new architecture for wireless sensors, called wireless ultra smart sensor, is introduced. The new sensor architecture is built using software defined radio concepts and it has...
In this work the identification and validation of a block-structured nonlinear Wiener system, that is captured in the feedback path of a closed-loop system, is studied. The technique is applied to the identification of a crystal detector. First, nonparametric initial estimates are generated for the linear dynamic blocks and the static nonlinear system. Next, a parametric model is identified. The extracted...
A broadband microwave attenuation measurement standard using audio frequency substitution method is described in this paper. The broadband standard includes a single channel and a dual channel system. The single channel system is used to perform accurate attenuation measurement from 10 MHz to 2 GHz. From 2 GHz to 26.5 GHz, the dual channel system is used to reduce the receiver noise and improve the...
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.