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本文给出耦合微带传输线的偶模阻抗Z_(0(?)),奇模阻抗Z_(00),偶模(奇模)波长与自由空间波长比λ_(0(?))/λ(λ_(00)/λ的解析表达式。同时也给出微带传输线的特性阻抗Z_0及波长对自由空间波长比λ_0/λ的解析表达式。这些组公式适用于各种介质,W/h>0.1范围内的TEM型波的耦合微带线及微带线。文中附有由若干种介质作基片的带状传输线的Z_(0θ)、Z_(00)、Z_0、λ_(0θ)/λ、λ_(00)/λ、λ_0/λ的曲线族。它们可应用于微波固体化电路的设计。用聚四氟乙烯介质基片制作了带通滤波器,并进行了测量,结果表明理论和实验符合得很好。
In this paper, the coupled mode impedance of the coupled microstrip transmission line Z 0 (?), The odd mode impedance Z 00, the even mode (odd mode) wavelength and the free space wavelength ratio λ 0 (?) / Λ (00) / λ. The analytical expressions of the characteristic impedance Z_0 of the microstrip transmission line and the wavelength ratio λ_0 / λ of the free space wavelength are also given. These formulas are applicable to various media with W / h> 0.1 (0), Z_ (00), Z_0, λ_ (0θ) / λ of the strip-shaped transmission line with several kinds of media as the substrate, λ_ (00) / λ, λ_0 / λ. They can be used in the design of microwave solidification circuit. The bandpass filter was fabricated by using Teflon dielectric substrate and the measurement was carried out. The results show that the theory and experiment In good agreement.