By Ananjan Basu
"This publication begins with a short evaluate, after which provides a quick precis of the elemental thought and the construction blocks required to appreciate and use microwave size innovations. After a short description of older size innovations (slotted wave consultant etc.) the e-book supplies a reasonably specified description of the vector community analyzer and the spectrum analyzer, which shape the spine of recent microwave measurements. complex issues reminiscent of pulsed measurements and non-linear community research are just pointed out in passing"-- Read more...
summary: "This booklet starts off with a short assessment, after which supplies a quick precis of the elemental conception and the development blocks required to appreciate and use microwave dimension thoughts. After a quick description of older size suggestions (slotted wave advisor etc.) the publication provides a reasonably specific description of the vector community analyzer and the spectrum analyzer, which shape the spine of contemporary microwave measurements. complex themes reminiscent of pulsed measurements and non-linear community research are just pointed out in passing"
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Additional resources for An Introduction to Microwave Measurements
094. 5° If we try to interpret the mathematical steps in this example, we notice that to evaluate S11, we should ensure that a2 = 0. This is ensured by connecting a 10 Ω resistor at port 2. But a 50 Ω transmission line terminated with a 10 Ω resistor definitely gives reflected waves (reflection coefficient Γ = –2/3). At the end of the transmission line (around port 2), there are indeed voltage and current waves traveling in both directions. So, the physical picture of terminating the ports to set all aj but one to 0 looks dubious.
Notice, however, that all this rests on the assumption that voltages and currents are well defined. As mentioned earlier, there are indeed situations where the incoming and outgoing waves are well defined, and not voltages and currents. 3 Let us investigate the S-parameters of a microstrip step junction from a 50 Ω line to a 20 Ω line. Again, let us choose a low frequency, say, 1 GHz, where the physical geometry of the discontinuity has little effect, and let us choose line lengths of 5 mm each, with a hypothetical air dielectric used in the microstrip.
12. Examining 1 Tm Tm ∫ ν(t)ν(t – τ)dt 0 for these cases, we conclude: 1. Rν(τ) has a peak of A 2 TTm1 at τ = 0. 2. Rν(τ) decreases linearly with τ up to τ = T2; Rν (T2) = A2 T1 –T2 Tm . 12 Shifted versions of v(t): >50% duty cycle. 3. Rν(τ) stays constant for T2 < τ < T1. 4. 13. 14. 15. 13 Autocorrelation of v(t). T1 Tm T1 Tm at τ = Tm. 14 Shifted versions of v(t): <50% duty cycle. Before going on to the PSD, it will be desirable to expand these in Fourier series: M Rm (τ) = ∑C e i jifmτ −M where f m = 1/Tm.
An Introduction to Microwave Measurements by Ananjan Basu