Comparison between theoretical and measured shielded microstrip dispersion properties in a wide-frequency range

摘要

Purpose - The purpose of this paper is to present the research on the effect of the shielding box to the dispersion properties of the microstrip lines, obtained by both theory analysis and the experimental test. Additionally, some principles about the effect of the shielding box are given, which could provide some useful information for the design of monolithic microwave integrated circuits. Design/methodology/approach - The dispersion of the shielded microstrip line is analysis by the MOL. The measured data are obtained by using vector network analyzer and the calibration method is through, reflect, line. The structure of the test fixtures will also be illustrated in this paper. Findings - The size of the shielding box has a great impact on the dispersion properties of the microstrip lines. The shielding box will lead to the decrease of the effective dielectric constant of the shielded microstrip lines. The effects of shielding box have a big relation to the ratio of the size of the shielding box to the size of the microstrip lines. When this ratio becomes bigger, the effects will decrease and can even be ignored completely.rnOriginality/value - This paper presents the effects of the shielding box on the dispersion properties of the microstrip lines. Both the measured results and the theory analysis are given in a wide-frequency range and the structures of the test fixture are also illustrated in detail.