... 56.37W, slotline feeds line width WS0=0.1 mm, characteristic impedance of the slotline ring ZS= 70 .7W, slotline ring UNIPLANAR RING RESONATORS AND COUPLING METHODS 87 Figure 3.34 Measured and ... and K. Chang, “Bandpass characteristics of split-modes inasymmetric ring resonators,” Electron. Lett., Vol. 26, No. 12, pp. 77 4 77 5, June 7, 1990. [7] I. Wolff, “Microstrip bandpass filter using ... 153–168, 1 971 (In English).[9] I.Wolff and N. Knoppik, “Microstrip ring resonator and dispersion measurementson microstrip lines,” Electron. Lett., Vol. 7, No. 26, pp. 77 9 78 1, December 30,1 971 .[10]...