ANALYTICAL ANALYSIS OF CIRCULAR-SHAPED MICROSHIELD AND CONDUCTOR-BACKED COPLANAR WAVE-GUIDE

In this paper, a new type of circular-shaped microshield and conductor -backed coplanar waveguide is proposed. Analytic closed-form expressio ns for characteristic impedance and effective dielectric constant for the new line are obtained using conformal mapping method under the ass umption of pure-TEM propagation and zero dispersion. The new waveguide proposed by this paper can reduce radiation to much less than the con ventional coplanar waveguide and microstrip, and can reduce the curren t concentration at both the edges of the strip conductor.