Rectangular microstrip structures are widely used in various microwave devices. Using the method of moments and principle of partial images, various techniques are developed to determine charge distribution in 2D models of microstrip structures (their cross-section). In this paper, a technique for calculating surface charge distribution and total capacitance of complex 3D rectangular microstrip structures is proposed using the mentioned method and principle. To demonstrate feasibility of the proposed technique, five rectangular microstrip structures were investigated. Obtained results are compared with the data published by other researchers. Total error is typically in 6-12% range.

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A method for determination of input impedance of meander slow-wave system with additional shields is presented. It is based on a technique used for a calculation of frequency characteristics of helical slow-wave systems. The input impedance was determined at two ports: on the edge and in the centre of a system. S11 parameter is known as the input reflection coefficient, so system's input impedance in the lower frequencies can be determined by changing the signal source and load resistances until minimum value of S11 parameter is obtained. Using proposed method frequency characteristics of input impedance and S11 parameter of a meander slow-wave system with additional shields is analysed in Sonnet software.

The algorithm of parametric synthesis of meander slow-wave system with additional shields is presented in this paper. The influence of main constructive parameters of meander slow-wave system with additional shields on its electrical characteristics was evaluated in order to achieve the optimal results of the synthesis. Verification of the algorithm of parametric synthesis of meander slow-wave system with additional shields was carried out using four different models of meander slow-wave system with additional shields grounded in different positions. Sonnet ® software package which is based on the method of moments has been used during the investigation.

Elektronika ir elektrotechnika Electronics and Electrical EngineeringPLANARiyjy PLACIAJUOSCiy LÉTINIMO SISTEMy TAIKYMO SRITYS Edvardas Metlevskis Vilniaus Gedimino technikos universitetas El pastas edvardas.metlevskis@vgtu.lt Santrauka. Mikrobangn itaisams projektuoti placiai taikomos ivairiq konstrukcijq planariosios placiajuostès lédnimo sistemos. Lietuvos mokslininkq darbuose nagrinéjami spiraliniq ir meanddniq lètinimo sistemq modeliai, tiriamos jq savybès. Darbe aptariamos meandriniq lètinimo sistemq taikymo sritys. Apzvelgiamos mobiliiyn irenginiq, radijo daznio identifikavimo, belaidzio ryäio technologijn sritys, kuriose tokios sistemos yra dazniausiai taikomos. Pateikiami darbij, kuriuose taikant meandrines lètinimo sistemas projektuojamos bei gaminamos antenos, filtrai ir Sakotuvai, pavyzdziai.ReikSminiai iodziai: planarioji placiajuostè lètinimo sistema, meandrinè lètinimo sistema, taikymo sritys, antenos, filtrai.