Effective Combination of Transmission Lines in Waveguide-Planar Microwave Systems of the Millimeter Wavelength Range
DOI:
https://doi.org/10.20535/RADAP.2023.91.18-27Keywords:
transmission lines, millimeter range wavelength, hybrid-integrated circuit, waveguide-platar technology, microstrip line, rectangular waveguideAbstract
In the millimeter wave band hybrid-integrated circuits take the form of waveguide-planar, which combines the advantages of planar technology and waveguides as low-loss systems. This makes it possible to successfully meet the high performance requirements of such devices as bandpass filters, multiplexers, etc. At the same time, elements that provide transitions between various integrated transmission lines and a waveguide become an important part of a complex microwave system, and the requirements for their characteristics - frequency band, losses, dimensions - become a challenge for designers. The article provides both an overview of the most successful designs aimed at solving this problem and a description of the transition topology proposed by the authors. The main attention is paid to the transitions between a rectangular waveguide and a microstrip line - all possible configurations of the joints of these waveguide systems are considered. It is shown that a number of designs make it possible to achieve a return loss at least 15dB in a frequency band, exceeding the operating frequency range of the waveguide with characteristic transition sizes not exceeding (0.2-0.3)λ0. It is proposed to use the results obtained to create efficient connections of the rectangular waveguides themselves with their complex mutual orientation. This solves many problems in the design of hybrid-integrated waveguide-planar microwave circuits, but can be successfully used in the development of purely waveguide systems, when the requirements of dimensions and cost in production are priority. The calculated data obtained in the article are compared with the results of an experimental study.
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Copyright (c) 2023 Тарас Романенко, Михаил Юрьевич Омельяненко , Ольга Васильевна Туреева
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