MICROWAVE MEASUREMENT ο·
represent the loss of the dielectric
Combination of the series and parallel parameters present an opposition to the current flowing through the line and is called an Impedance Z, where π = (π β ππ) πβπ A measure of how easily a circuit or device will allow a current to flow is called an admittance Y, where, π=
1 = (πΊ β ππ΅) π π
Therefore, admittance can be calculated from given impedance Z and vice versa.
EXAMPLE 1: (a) Determine the admittance Y1 for the given Z1= (100 + j50) β¦ and
(b) Z2 for given Y2= (0.015 β j0.023) S
(a) Y1 (S) =
1 1 = = β―β¦ Z1 100 + j50
(π) π2 ( ) =
1 1 = = β―β¦ π2 0.015 β π0.023
3.2.2 Impedances In high frequency transmision line, signal propagates inside the line using electromagnetic wave. The input signal will be referred as incident wave that will travel along the transmission line of length l. When the wave reaches the load at the end of the line, part of the wave will be reflected back as shown by Figure 3.1.3. The magnitude or the strength of the reflected wave will be determined by the characteristic of the load.
ππ’π§ Figure 3.1.3: Propagation of signal or wave inside the transmission line where the incident wave is reflected back by the load at the end of the line. Page 7
