Asymmetric Stripline Research Articles

Low-drive-power asymmetric Mach-Zehnder modulator with band-limited operation

A novel 2*2 asymmetric Mach-Zehnder interferometric modulator is fabricated on Ti:LiNbO/sub 3/ waveguide and tested at microwave frequency. Band-limited operation was realized by using a traveling-wave periodic polarity reversed structure with the asymmetric strip line as the modulator electrode instead of the conventional coplanar waveguide. For a modulator with a three-section polarity reversed electrode, a 3-dB bandwidth of 7 GHz was obtained experimentally from 9 to 16 GHz centered at 12 GHz.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Novel filter design incorporating asymmetrical stripline Y-junction circulators

Theoretical treatments of an asymmetrical stripline Y-junction circulator have been carried out. These include a formulation of the circulation conditions of an asymmetrical circulator as well as its transmission characteristics under wide-frequency-band consideration. It is found that filter designs incorporating circulators are very plausible and give rise to a narrow transmission band around the desired transmission frequency and a wide stopband extending many times the fundamental transmission frequency. In this design, high order mode excitations inherent in other filter designs are attenuated. In addition, owing to the off-resonance operation of the ferrites, present design could be applied under higher power conditions than traditional resonant ferrite filters.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

High-speed low-voltage modulation with a nonsymmetric Mach-Zehnder interferometer

The authors demonstrate broadband optical modulation with a Ti:LiNbO/sub 3/ nonsymmetric interferometer at microwave frequencies up to 16 GHz. The 3-dB bandwidth of 8.7 GHz is only slightly less than the theoretical limit of 9.6 GHz for a 1-cm-long device. The device uses a 2- mu m-thick gold-plated asymmetric stripline electrode, with a characteristic impedance of 40 Omega and ohmic loss of 3 dB/cm at 10 GHz. The DC switching voltage is 6.5 V, and the on/off ratio is -16 dB. Fabrication tolerances in the nonsymmetric interferometer are much less strict than for directional coupler modulators with comparable performance, making this device a better candidate for use in communications systems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Analysis of Asymmetric Coupled Striplines (Short Papers)

A unified method for the quasi-static and the hybrid-mode formulation of asymmetric coupled striplines is presented. Variational expressions are derived for the matrix elements, which describe the quasistatic characteristics, for the first time. A very accurate numerical method is shown and some numerical examples are presented for the different types of asymmetric coupled striplines with anisotropic substrates.

The Application of New Du Pont/USA/Copper Composition for Manufacturing of Thick-Film Microwave Low Loss Resonators on L and X Band

The applicability of the various copper compositions to the production of thick-film microwave devices has been examined. The results of this work are presented in this paper. The paper presents criteria and computer programs for thick-film microwave integrated circuits. The investigations of asymmetrical striplines, stripline and circular resonators, microwave filters etc., have been used as a basis. The circuits were examined within the frequency band of 1–12 GHz. Based on the measurement results and the statistical analysis of the parameters of microwave integrated circuits, interesting conclusions concerned with the applications of thick-film techniques to microwaves have been drawn. The results obtained have been compared with other work and new mathematical models have been prepared. Finally the future development of microwave integrated circuits has been commented on.

Analysis of inhomogeneously filled stripline and microstripline

The conformal mapping technique developed for the anlaysis of homogeneously filled asymmetric stripline is used for the determination of the characteristic impedance of an asymmetric stripline filled with different dielectrics on either side of the strip. The analysis is also applied to the microstrip line, by considering it as the limiting case of an asymmetric stripline. Comparison of the results with those obtained by other methods is presented

Analysis of Asymmetric Stripline by Conformal Mapping

This paper presents analysis of asymmetric stripline using a conformal mapping technique. The expression obtained for the characteristic impedance shows its functional dependence on the dimensions of the stripline. Equations for equipotential and flux lines and an expression for field distribution in the stripline are derived. Plots of impedance variation with strip width and strip displacement are presented.

Calculation of the asymmetrical stripline characteristic impedance by self-consistent field method

The application of the self-consistent field methods to the calculation of the asymmetrical stripline characteristic impedance has been investigated. A criterion for iteration procedure is proposed and numerical data for large variety of the strip thickness and width are presented. For some particular cases, where is possible comparison with the results of other authors, the data obtained for the impedance-are in good agreement.

ICs on film strip lend themselves to automatic handling by manufacturer and user too : S. E. Scrupski, Electronics, 1 February (1971), p. 44

Modeling and simulation of interconnect materials has become critical to the success of high performance ULSI, packaging, and multilayer schemes for multichip modules. Computer simulation of the characteristic impedance Z (Ohms), capacitance C (pF), working frequency f (MHz) of Al asymmetric stripline filled with anodic Al oxide with dielectric constants 4 and 6.6 for multilayer schemes in a hybrid multichip module were conducted. A RLC-model of the frequency of Al transmission lines was successfully used. Using conformal mapping, the functional dependence of the characteristic impedance and working frequency on the capacitance of the Al stripline filled by anodic Al oxide can be determined. The results are valid for high frequencies. To evaluate this model and characterize its performance with high speed electrical multichip module design, a test cell using a multilayer interconnect structure Al/anodic al oxide on an Al substrate was developed.