Wideband RF technologies and antennas in microwave by Dr. Albert Sabban

By Dr. Albert Sabban

"This publication provides purposes of vast Band RF applied sciences and Antennas. the writer starts off through discussing electromagnetic thought for RF designers. The ebook covers electromagnetic thought and microwave and mm wave RF applied sciences. the writer examines MIC, MMIC, MEMS, and LTCC applied sciences. The textual content also will current details on meta-materials, layout of microwave and mm wave platforms, in addition to a glance at Read more...

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provides wideband RF applied sciences and antennas within the microwave band and millimeter-wave band This ebook offers an updated creation to the applied sciences, layout, and try out systems of RF Read more...

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However, standard transmission lines have real impedance values. 6 Quarter-wave transformer. Z=0 33 MATCHING TECHNIQUES ZL = R + jX, we transform ZL to a real impedance ZL1–jX to ZL. Connecting a capacitor –jX to ZL is not practical at high frequencies. A capacitor at high frequencies has parasitic inductance and resistance. A practical method to transform ZL to a real impedance ZL1 is to add a transmission line with impedance Z0 and length l to get a real value ZL1. 3 Wideband Matching: Multisection Transformers Multisection quarter-wave transformers are employed for wideband applications.

The derivative as function of time is jωejωt. By using these relations we may write phasor transmission line equations: dV = − ZI dZ dI = − YV dZ d2 V = γ2V dz2 d2 I = γ2I dz2 2 34 27 TRANSMISSION LINES where Z = R + jωL Ω m Y = G + jωC m Ω 2 35 γ = α + jβ = ZY The solution of the transmission line equations in harmonic steady state is v z, t = Re V z e jωt i z, t = Re I z e jωt V z = V + e − γz + V − e γz I z = I + e − γz + I − e γz 2 36 2 37 For a lossless transmission line, we may write dV dZ dI dZ d2 V dz2 d2 I dz2 = −jωLI = − jωCV 2 38 = −ω2 LCV = − ω2 LCI The solution of the lossless transmission line equations is V z = e jωt V + e − jβz + V − e jβz I z = Y0 e jωt V + e − jβz − V − e jβz vp = ω = β 2 39 1 1 = με LC where vp is the phase velocity.

Dynamic range—Dynamic range of a receiver is a measurement of the minimum detectable signal to the maximum signal that will start to compress the receiver. Signal-to-noise ratio (S/N or SNR)—SNR is a measure of how far a signal is above the noise floor. 16 ELECTROMAGNETIC WAVE PROPAGATION AND APPLICATIONS Noise factor, noise figure, and noise temperature • Noise factor is a measure of how the signal to noise ratio is degraded by a device: F = noise factor = (Sin/Nin)/(Sout/Nout) where Sin is the signal level at the input Nin is the noise level at the input Sout is the signal level at the output Nout is the noise level at the output • The noise factor of a device is specified with noise from a noise source at room temperature (Nin = KT), where K is Boltzmann’s constant and T is approximately room temperature in Kelvin.

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