A.S. Kukharenko − Ph.D. (Eng.), Leading Engineer, 
JSC «National technical physics and automation research institute» (NIITFA) E-mail: alexk.05@mail.ru

Microstrip meander-line and gap-line are already well-known and well-investigated constructions and already for a long time they are basic elements of HF and UHF modules and devices design. But to get new microwave constructions with better and sometimes new properties the structures are more and more often used not independently alone, but in combination with each other and other structures, forming a system of coupled slow-wave circuits.  In the case standard methods of analytical calculation of characteristics of microstrip and gap transmission lines can’t be implemented any more. It makes UHF devises preliminary design procedure much more complicated. The work presents a method of analytical calculation of complex resistance of microstrip meander-line formed above impedance surface, suggested by author.  The method allows making a fast analysis of such constructions and gives to developers a tool for fast evaluation of UHF devices characteristics and parameters, what is required on preliminarily design stage. The method description is based on analysis and calculation of complex resistance of a frequency-selective device construction, formed by superposition of a gap line and microstrip meander-line, which form a multy-layer structure. The structure forms a band-gap filter with operation band of more than octave which also has metamaterial properties. Results of described structure complex resistance calculation are presented in the paper and their comprising with results of measurement of the frequency-selective devise sample is provided. Calculated and measured results are in a good correspondence. It shows that the method of analytical calculation, presented in the paper, can be used for preliminarily evaluation of parameters of devices, based on microstrip meander line formed over an impedance surface.

Kukharenko A.S. Analytical calculation of complex resistance of a microstrip meander-line placed over an impedance surface. Electromagnetic waves and electronic systems. 2020. V. 25. № 1–2. P. 90−95. DOI: 10.18127/j15604128-202001-2-10 (in Russian).

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