Inverted Strip Dielectric Waveguide Research Articles

Optimization of the method for exciting an inverted strip dielectric waveguide with metal plane

Background. Currently, the application of various types of dielectric waveguides in the millimeter wavelength range is very promising, including metal-dielectric structures and functional units based on them. This is due to the simplicity and low cost of manufacturing dielectric waveguides and functional units based on them, the possibility of their integration with active elements, the use of various dielectrics and polymers having both a wide range of dielectric constants and a variety of mechanical properties (in particular, some dielectric materials have significant flexibility).Objectives. To optimize the method of excitation of one of its eigenwaves in a inverted strip dielectric waveguide with a metal plane through a series of physical experiments.Materials and methods. The studied electrodynamic structure belongs to the class of hybrid metal-dielectric structures. Its basis is a inverted strip dielectric waveguide with a metal plane. A feature of the used inverted strip dielectric waveguide is its composition: the main part of the waveguide rod adjacent to the metal plane is made of polystyrene, the second part is made of fluoroplastic. The evaluation of the excitation efficiency was carried out by the magnitude of the introduced attenuation into the tract. Using the method of a moving probe, the degree of concentration of the electromagnetic field near a complex compositional waveguiding rod was estimated. The fields were visualized using the contour method.Results. Based on a series of experimental studies, the method for exciting an inverted strip dielectric waveguide with a metal plane is optimized. The effect of optimal excitation was achieved through the use of the composite design of the dielectric waveguiding rod. With the optimal ratio of the material constants of the layers forming the waveguiding rod and the geometric parameters of these layers, it was possible to significantly expand the working frequency band, within which the level of insertion loss did not exceed the specified values. It was found that the electromagnetic field is concentrated mainly near the dielectric rod, providing a stable wave mode. It has been established that with a certain ratio of structure parameters, the frequency selection mode can be implemented in it. Conclusions. In the course of physical measurements, it was found that a inverted strip dielectric waveguide with a metal plane with the optimal choice of parameters is able to effectively maintain the wave mode with a low level of insertion loss. In general, a structure with a certain choice of parameters can operate in two regimes: waveguiding mode and frequency selection mode.

Design and analysis of transitions from rectangular waveguide to layered ridge dielectric waveguide

Transitions from rectangular waveguide to layered ridge dielectric waveguide are studied both experimentally and theoretically. In addition, a design procedure is given for each transition. The analysis and design procedures are valid for transitions between rectangular waveguide and other open dielectric waveguides such as image guide, insulated image guide, dielectric ridge guide, and inverted strip dielectric waveguide. It is shown that for small dielectric waveguides such as layered ridge dielectric waveguide, a transition which is comprised of a tapered ridge waveguide reduces the radiation loss by at least 1 dB.

Computer aided design of inverted strip dielectric waveguide millimeter wave ring-resonator and coupler

A computer aided design technique has been developed for the design of millimeter-wave ring resonator and hybrid-ring coupler using inverted strip dielectric waveguides. The scattering matrix analysis for hybrid-ring coupler has also been developed. Numerical results for these components at f0=80 GHZ with 3-dB coupling have been presented along with the variation of width, spacing, and radii with frequency.

Computer aided design of inverted strip dielectric waveguide millimeter-wave couplers

A computer aided design technique has been developed for the design of a beam splitter coupler and a distributed type coupler using inverted strip dielectric waveguides. The optical beam principle has been used for the beam splitter coupler. Numerical results for these couplers at 80 GHZ with minimum directivity of 30 dB and VSWR of 1.15 have been presented.

Design of millimetre wave components using inverted strip dielectric waveguides

Abstract Design techniques of millimetre wave components using inverted strip dielectric waveguides are described in this paper. The design procedures are centred around 80 GHz but are equally valid For other frequencies of millimetre waves.

Analysis of Open Dielectric Waveguides Using Mode-Matching Technique and Variational Methods

The mode-matching technique is employed for computing the propagation constants and field distributions of an inverted strip dielectric waveguide. The results derived in this manner are further improved by using variational formulas expressly designed for open dielectric waveguides. Illustrative numerical results are presented and compared with an experimental measurement as well as those based on approximate methods found in the literature.

Application of Gratings in a Dielectric Waveguide for Leaky-Wave Antennas and Band-Reject Filters (Short Papers)

Grating structures fabricated in inverted-strip dielectric waveguides have been used for the first time as leaky-wave antennas and band-reject filters. They are potentially useful for millimeter-wave integrated circuits. Experimental results agree reasonably well with theoretical predictions.