In this paper, closed-form expressions are presented which model the frequency-dependent even- and odd-mode characteristics of parallel coupled microstrip lines with hitherto unattained accuracy and range of validity. They include the effective dielectric constants, the characteristic impedances using the power-current formulation, as well as the open-end equivalent lengths for the two fundamental modes on coupled microstrip. The formulas are accurate into the millimeter-wave region. They are based on an extensive set of accurate numerical data which were generated by a rigorous spectral-domain hybrid-mode approach and are believed to represent a substantial improvement compared to the state-of-the-art and with respect to the computer-aided design of coupled microstrip filters, directional couplers, and related components.
"The effe,o and Z Ce,o are respectively, the effective permittivities and the characteristic impedances at the end of circuits while C fe,o expresses the fringing capacitances. Their expressions could be defined from . The substrate network resistance, which is defined by the two components (lateral and vertical) of the bulk and the active regions, can be determined from the above analytical expressions. "
[Show abstract][Hide abstract] ABSTRACT: Current innovations in electronics combine performance , size and cost criteria. Nevertheless, in the all-digital era, the 2D technology and the fabrication of CMOS Integrated Circuit are approaching their ultimate limits. As a result, the use of 3D technology in the fabrication of different Integrated Circuits becomes very appealing. Among the aspects of the 3D Integration we find the Through Silicon Vias (TSVs), short vertical interconnects that convey the different layers all kind of signals. 3D integration, first introduced for memory chips, has later found increasing application to other domains in microelectronics. The aim of this research is to investigate the electrical performances of MOS devices which have nearby such a type of interconnects (TSVs) in view of optimizing their behavior with the implementation of an analytical model able to describe the TSVs behavior at the circuit level in order to predict and optimize the performance of MOS devices with 3D-TSV interconnect. The accuracy of this model is eventually validated using numerical TCAD simulations.
Design & Test Symposium (IDT), 2014 9th International; 12/2014
[Show abstract][Hide abstract] ABSTRACT: We analyze the microstrip directional couplers with
a special focus on the phase difference between the coupled and
isolated ports. The analysis uses the even-odd mode decomposition
technique and network theory. The results show that the phase difference
between the signals at the coupled port and the isolated
port is close to pi in a very wide band. This property can be used
to achieve a broadband directivity by inducing a voltage cancellation
at the isolated port of the couplers. Two different cancellation
methods are investigated. Analytical formulas for the required
component values of both methods are given. Higher directivity
can be obtained at the expense of reduced bandwidth.
IEEE Transactions on Microwave Theory and Techniques 12/2013; 61(12):4063. DOI:10.1109/TMTT.2013.2288601 · 2.24 Impact Factor
"J j, j+1 is the characteristic admittance of J inverter and Yo is the characteristic admittance of the connecting transmission line. With the data of characteristic admittance of the inverter, the characteristic impedances of even-mode and odd-mode of the parallel-coupled microstrip transmission line can be calculated  - as: "
[Show abstract][Hide abstract] ABSTRACT: In this paper, a compact narrow band bandpass filter is proposed with hexagonal dumbbell shaped defected ground structure in ground plane of a 50� microstrip line and a closed loop resonator in the conducting strip. This arrangement provides better coupling in pass band. Using DGS structure, forward transmission loss (S 21) is -0.5 dB and return loss (S 11) is -26.7 dB at the centre frequency 5.4 GHz with narrow bandwidth of 500 MHz. A conventional parallel coupled line bandpass filter has also been implemented with exactly same design goals for the sake of comparison. The proposed bandpass filter with DGS is quite promising with 60% size reduction.
National Conference on Communications (NCC) 2012; 01/2012
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