Transmission Lines

Transmission Lines:

Choke Balun : A Choke Balun, or balance-to-unbalance transformer, is a circuit element used to connect a balanced line to an unbalanced line or antenna. Or, as is perhaps a little more common, it is used to connect an unbalanced (coaxial) line to a balanced antenna such …


Double Stub Matching : If a transmission-line matching device is to be useful in a range of different matching situations, it must have as many variable parameters, or degrees of freedom, as the standing-wave pattern. Since the pattern has two degrees of freedom (the SWR and the …


Fundamentals of Transmission Lines : Fundamentals of Transmission Lines (in the context of this book) are considered to be impedance-matching circuits designed to deliver power (RF) from the transmitter to theĀ antenna, and maximum signal from the antenna to the receiver. From such a broad definition, any system …


Losses in Transmission Lines : Types of Losses in Transmission Lines are three ways in which energy, applied to a transmission line, may become dissipated before reaching the load: radiation, conductor heating and dielectric heating. Radiation losses occur because a transmission line may act as an antenna if …


Quarter Wavelength Transmission Line : Sections of transmission lines that are exactly a Quarter Wavelength Transmission Line or Half Wavelength Transmission Line long have important impedance-transforming properties, and are often used for this purpose at radio frequencies. Impedance inversion by Quarter Wavelength lines: Consider Figure 7-8, which shows a …


Reactance Properties of Transmission Lines : Reactance Properties of Transmission Lines : Just as a suitable piece of transmission line may be used as a transformer, so other chosen transmission-line configurations may be used as series or shunt inductive or capacitive reactances. This is very advantageous indeed. …


Smith Chart for Transmission Line : The various properties of transmission lines may be represented graphically on any of a large number of charts. The most useful representations are those that give the impedance relations along a lossless line for different load conditions. The most widely used …


Standing Waves in Transmission Lines : When power is applied to a transmission line by a generator, a voltage and a current appear whose values depend on the characteristic impedance and the applied power. The voltage and current waves travel to …


Two Hole Directional Coupler : It is often necessary to measure the power being delivered to load or an antenna through a transmission line. This is often done by a sampling technique, in which a known fraction of the power is measured, so that the total maybe …


Updated: May 1, 2020 — 11:55 pm