| OCR Text |
Show stage transformer is positioned the load serves no impedance is infnite. function at all that shown in Fig. 24a. to short in a a for optimum As matter of fact, the transformer since the fild pattern is identical with The infinite load impedance is transformed quarter wavelength regardless of the nature of the characteristic impedance. his is also easily the transmission line equation for z The cotangent goes to z a conditions, i.e. wpere zero in an visualized by examining open circuit. j Z a quarter wavelength independently of o cot kL • o If the tranformer is not positioned at the point of maximum impedance, the transformed impedance will definitely depend is chosen If Z o reduced to seen an small enough, produces lengths. an conditions for The five on on the however, that a the low It impdance signal resonance as will be . o secondary rimary. Z be can can be trans extremely large lumped capacitance at longer This destroys the following section. seen wave- in the A compromise must be made to maintain optimum both circuits. which provided unity stage impedance transformer flection coefficient for the idler frequency at the the various sections are can be analyzed as re- a low Since the dimensions between signal frequncy. pass filter a imedance app+oximte short circuit without much difficulty, former any on the signal wavelength, small when compared with the actual transmission lumped element equivalent of - 57 - line will serve |
