Bharathi Bhat

Accurate characterization of an inductive strip in finline

The modeling of inductive strip discontinuity in finline has been carried out using the hybrid-mode analysis in conjunction with the transverse resonance technique. It is shown that an appropriate modification in the commonly assumed sinusoidal distribution for the z-dependent slot-field basis function allows an accurate characterization of the strip discontinuity. The computed results are shown to match well with experiments and also with the experimental data available in the literature. >

Passive Components in Inverted Microstrip and Suspended Microstrip Configurations

This paper reports the development and performance characteristics of a number of passive components in the inverted microstrip and the suspended microstrip configurations. These devices are fabricated at frequencies up to X-band. However, using proper scaling, devices at millimeter wave frequencies should be possible in these two configurations.

Evaluation of End Effects and Lumped Capacitance of Microstrip with Anisotropic Substrates - Transverse Transmission Line Technique

In this paper transverse transmission line technique is used to analyse the lumped capacitance and end effects of microstrip line with anisotropic substrate. In the resulting capacitance expression, the only parameter dependent on the transmission media is the admittance at the charge plane Which Can be easily determined using a two wire transmission line equivalent. Extensive design data on the lumped capacitance and end effects of micros trip with anisotropic substrates, sapphire and pyrolytic boron nitride, are generated. This data should be very useful for the design of filters and directional couplers in microstrip configuration with anisotropic dielectrics.

Simplified Analysis of Stripline, Microstripline and Coplanar Strips, with Anisotropic Substrates for MIC and SAW Applications

A unified variational expression is derived for the line capacitance of a general, multilayer anisotropic structure. The propagation parameters of a variety of striplines, microstriplines and coplanar strips with anisotropic substrates, in isolated and coupled configurations, can be obtained by simply determining the admittance parameter.

Microwaves in the asia-pacific region

Infrastructure elements to produce microwave engineers and to promote microwave research and development in the Asia?Pacific region are described by active professors and researchers in this area as a multiauthor forum. The content of each description focuses mainly on the role of present-day universities, government, and industry.

Theoretical Investigation of Periodic Structures in Unilateral and Bilateral Finlines

This paper reports a detailed hybrid mode analysis of periodic structures in unilateral and bilateral finlines. The analysis makes use of Floquets theorem in conjunction with Galerkins method to find the propagation characteristics of periodic structures. Two types of periodic structures are considered; one consisting of transverse stubs periodically coupled to the main slot of an asymmetric finline in unilateral and bilateral configurations, and the other is formed by placing inductive stubs at periodic intervals along the main slot of unilateral and bilateral finlines.

Double-Dielectric Fin-Line with Variable Characteristics for Millimeter Wave Integrated Circuit Applications

A brief outline of the spectral domain method for computing the frequency dependent guide wavelength and characteristic impedance of double—dielectric fin-line (fins facing side walls), is reported in this paper. The computed results illustrate (1) the dispersion and impedance characteristics of the double-dielectric fin-line, (2) the variations of the even-and odd-mode guide wavelengths and characteristic impedances as a function of slot width, and (3) the effect of varying the spacing between the substrates on the even-and odd-mode propagation parameters. This structure should find application in millimeter-wave integrated circuits, especially in the design of filters.

Design Data on Inverted and Suspended Microstrip Lines for Mic Applications

A brief outline of the theoretical method for computing the characteristic impedance of the inverted microstrip and suspended microstrip lines, for Microwave integrated Circuit application, at frequencies above X-band, is reported in this paper. Design data on the impedance characteristics of single and coupled lines for both these configurations are presented.

Materials and Technology for Microwave Integrated Circuits

Advances over the past two decades in the planar techniques and technology and also in the miniature microwave solid state devices compatible with this technology have led to the realization of compact microwave integrated circuits (MICs). These circuits are built on planar transmission lines such as the stripline, microstrip line, suspended stripline, suspended microstrip, inverted microstrip, slot line, coplanar waveguide and coplanar strips. The basic geometries of these lines are shown in Fig. 1. For MICs, these planar transmission lines are formed on substrates made of low loss dielectrics, ferrimagnetics and semiconductors. A typical MIC consists of one or more of the following parts: (a) distributed elements (b) lumped elements in planar/discrete form, (c) semiconductor devices and (d) special elements such as dielectric resonators and ferrite discs. Two different technologies; viz. hybrid and monolithic are well accepted for the fabrication of MICs.

Broadside-Coupled and Broadside Edge-Coupled Stripline-Like Transmission Lines with Anisotropic Substrates

An example of a broadside-coupled symmetric strip transmission line embedded in a homogeneous anisotropic dielectric, with principal axes (in the transverse plane) rotated with respect to the xy co-ordinate axes, is analysed using the spectral-domain technique under the quasi-static approximation. Comparison of the final capacitance formula with that of a corresponding isotropic structure derived using the two-wire transmission line analogy and identification of an admittance parameter leads to generalization of the capacitance expression for a class of symmetric broadside-coupled lines. Similar approach is used for evolving a general variational capacitance expression applicable to a class of broadside, edge-coupled lines. Numerical results are presented on the characteristic impedances and effective dielectric constants for some of the typical transmission structures with anisotropic substrates having principal axes in the transverse plane either aligned or rotated with respect to the xy coordinate axes.