This paper presents the design and performance of an unequal divider with physical separation and electrical isolation. This divider has a complex isolation component between two quarter-wave transmission lines at an arbitrary phase angle from input terminal. Also, to design unequal divider with a high dividing ratio, we select a high impedance line of limited value to fabricate microstrip line and a low impedance line of below 10 Ω can be designed to use periodic open shunt stub connection transmission line. As a design example, a 1:10 ratio divider was designed and measured at center frequency of 1 GHz to show the validity of the unequal divider using periodic open shunt stub connection transmission line. Its performance is in good agreements with the simulated results.