Consider a network composed of 3 cascaded elements. the frequency of operation is 1GHz. The load impedance is unknown. Note that an impedance is of the form: Z = a + jb. Use ABCD matrices to solve this problem. 1 = 1/4 12. V1 1v B, Zo 000 V 2 L =-nH Zo = 500 E. This cascaded network is designed to be a -90 degrees phase shifter. In other words. V2 = Viz -90 = -jVi. Hence. Zz is equal to Ohms. In this case, the lumped element is a : (your answer should be: R for resistor, C for capacitor, or L for inductor) F. This cascaded network is designed to be a 180 degrees phase shifter. Hence. Zz is equal to Ohms. In this case, the lumped element is a : (your answer should be: R for resistor. C for capacitor, or L for inductor)