By Christopher Coleman
As an undergraduate pupil taking an top point instant circuits direction, this booklet was once crucial and critically upset either the category and the trainer. whereas the ebook introduces numerous subject matters proper to RF engineering, it is going nowhere in constructing valuable rules and delivering enough motives for equations. The logical move is damaged in the course of the textual content, and it's going to in simple terms make experience to somebody already universal to RF engineering. To any engineering scholars acquainted with skinny texts masking expansive material, and delivering no concrete perception, this ebook matches completely into that type. the single part that built a bit greater than the others involved a evaluate of resonant circuits, in spite of the fact that, different texts can be found that supply far better insurance.
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Extra resources for An Introduction to Radio Frequency Engineering
8 Matching examples L-network example A 100 MHz source with internal resistance Z S = 25 + j5 is to be matched to a 50 load by means of an L-network. Away from this frequency, however, the network is required to operate as a high-pass filter. 19). We will need jX L 50 to have resistive component 25 and a reactive component that cancels 5 + X S . Consequently, 25 = X 2L R L ⇒ X L = 50 R L2 + X 2L and 5 + XS = − X L R L2 ⇒ X S = −30 , R L2 + X 2L where X L has been chosen to be positive in order to generate a shunt inductance.
The combination will behave as a short circuit at this frequency). Below the resonant frequency, the combination will have a capacitive reactance whose magnitude increases with decreasing frequency. Above the resonant frequency, the combination will have an inductive reactance that increases with frequency. c. 1). 1) 0 from which, in terms of Laplace transforms (indicated by the argument s), i(s) = 28 vi (s) . 1 R vi vo Series resonant circuit. The voltage vo across the load will be given by s(R/L) vi (s) + Rs/L + 1/LC = A(s)vi (s).
15 shows a network that is intended to match the load RL to the source RS . The configuration uses two L-networks to transform both source and load into a common impedance R. Because of this common impedance, the L-networks can be joined directly to form a π network. 15 jX3 RL π-network. 16 j X 2b R jX1 R jX3 RL Analysis of π-network. 17 RL T-network. 16. ) For the calculation of bandwidth we take an overall quality factor Q = √ [max(RS , RL )/R] − 1, which is the highest Q of the two L-networks.