Some new types of coplanar transmission lines，rectangular microshield coplanar coupled lines [RMCCL]，coplanar coupled rectangular microshield lines [CCRML]，are proposed for MMIC applications，which are developed from the coplanar coupled lines [CCL]，coplanar coupled striphnes [CCS]. The analytic formulas are presented for calculating the quasi-static TEM parameters of these coupled lines by means of exact conformal mappling techniques. Numerical results are also presented to illustrate the properties of these coplanar transmission lines.