![]() ![]() implemented on originally developed GUI software based on the Qt4 platform under the MSWindows operating system. The data acquisition, control and processing are. Communication between the ADC, ♜ and the PC computer is realized over SPI and USB interface, respectively. The device consists of I-V converter, 24 bit Σ-Δ ADC, microcontroller (♜), personal computer (PC), feedback loop control and galvanic insulation units. Wide Range Current Amplifier (WRCA) width DAQ system is constructed and tested. Finally, experimental verification of the balun theory is presented, along with an application to an S-band impedance-transforming compensated balun. An example of the compensation of a dipole antenna over a 17-percent bandwidth is discussed. The reactance slope of the compensated balun is controllable, which allows the balun to directly compensate for the reactance slope of some loads. ![]() ![]() Because impedance transformation is generally required with balanced-to-unbalanced line transformation, two techniques including impedance transformation are discused. Since the balun is one-quarter wavelength long at center frequency, the balun can be less than one-twentieth wavelength at its lowest operating frequency. The practical considerations which preclude realization of infinite. Curves are presented which allow the design of a balun having any bandwidth. This balun is analyzed here and the parameters which determine its bandwidths are discussed. ![]() The compensated balun, first described by Marchand and later reinvented by Roberts, is found to have much broader band-widths than realized by either author. | < -20 dB) of 30% with the minimum insertion loss of 0.1 dB. For demonstration, a prototype of size 15 mm x 95 mm (0.15 λ Analytical and practical bandwidth limitation has been analyzed, and it is shown that the bandwidths can be controlled by the oddand even-mode impedance of the coupled lines. Analytical solution of the parameters for specified bandwidth can be achieved using oddand even-mode analysis. suppression using additional quarter-wavelength open stubs is discussed. Furthermore, enhancing the bandwidth for common-mode. Configured by three quarter-wavelength coupled lines, the proposed power divider is compact and able to enhance the bandwidth of differential-mode power dividing, isolation, common-mode suppression, and phase difference between the output ports. In this paper, a coupled-line balanced-to-single-ended out-of-phase power divider is proposed. ![]()
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