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|Title||Nonlinear Composite Left/Right handed Transmission Line Media with RTD|
The composite right/left-handed (CRLH) transmission line (TL) is presented as a general TL possessing both left-handed (LH) and right-handed (RH) natures. RH materials have both positive permittivity and positive permeability, and LH materials have both negative permittivity and negative permeability. In this work, we designed and analyzed a nonlinear CRLH-TL media with Resonant Tunneling Diode (RTD). There are two goals of this work. The first goal is to design transmission line capable of filtering and amplifying high frequency signals at very widebands. In this case, we designed a compact ultra-wideband (UWB) filter capable of amplifying input signal with an additional power added to the output signal that equals 50% of the input signal. The bandwidth pass band of the filter goes from 5-10.5 GHz. This is satisfied by added RTD to CRLH-TL. The second goal is to design voltage controlled oscillator (VCO). The VCO model is constructed by combining the RTD with one cell of CRLH-TL. In this case, we designed three prototype device examples. The first one is a one cell with short circuit at the beginning of the cell between ground and patch, and 50 Ω load resistance at the end of the cell between ground and patch. The second one is similar to the first prototype but with open circuit at the beginning of the cell instated of short circuit. The third prototype consists of one cell with two 50 Ω load resistances between ground and patch at both the beginning and at the end of the cell. The RTD was biased using a variable DC voltage supply producing voltage oscillator at resistance load when the RTD biased in the negative differential resistance (NDR) region. The VCO capable of generating oscillation at frequencies in the range between 4.87- 14.9 GHz depending on the biasing DC voltage. We used OrCAD, ADS and MATLAB softwares to analyse the proposed circuits. CRLH-TL based on modified hybrid approach, which consists of a microstrip line loaded with complementary split-rings resonators (CSRRs), series gaps, and shunt inductor, with RTD parallel to the shunt inductor is used to satisfy the goals of this work.
|Publisher||الجامعة الإسلامية - غزة|
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