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Considering simulations of electromagnetic transients and searching for better results, it is investigated the limits of the change of the representation of the longitudinal parameters in the model of infinitesimal unit of transmission lines' model. It is introduced a damping resistance in parallel to the impedance that represents the longitudinal parameters of transmission lines. Several simulations...
In the late 1990s and early 2000s, Carl Baum proposed the idea of generating moderate bandwidth electromagnetic waveforms using quarter-wave switched oscillators. After his initial conceptual proposition, it took several years to realize these systems, and many lessons were learned along the way. This article captures the details of the modeling and design methodologies that we have developed over...
We present self-consistent time-domain simulation of trains of short oscillation pulses in a time-delay transmission-line circuit of active devices with a remote resonator for emerging radar applications. Inherent instability and essential nonlinearity of active devices makes many simulation tools inadequate for rigorous modeling of active systems with complicated dynamics of generated fields. Conventional...
Nowadays, absolute majority of circuit simulation programs contains classic Branin model of lossless transmission lines. However, characterizing the four delays (t - TD) incorporated in the model still causes difficulties due to incompatibility with most algorithms for solving algebraic-differential equations. In the paper, a mathematical substitution of the delay is suggested which smoothly cooperates...
Oscillator schematics which used single transistor circuit is proposed and design based on negative resistance concept. Symbolic input and output impedance of the proposed schematic are derived. Even though, its input and output resistance is not negative, the adaptive impedance matching network will be proposed to make input and output impedance of any circuits to have negative resistance.
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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