Just as the electric field obeys certain rules, the magnetic field (H-field) also obeys certain rules along the boundary of two different materials. And again, the rules depend on whether we are discu ...
Electric Fields obey certain rules. On this page, we'll give these rules. It is important to have a good understanding of these. The electric field distribution around a complex antenna or structure c ...
So if Inductance is associated with stored energy in the magnetic field, what represents stored energy in the Electric Field? This is the topic of Capacitance. Consider a sinusoidal voltage applied ac ...
As seen on the previous page, the Electric Field arises due to electric charges. It doesn't matter how the electric charges got there, be it a voltage source across a capcitor or someone rubbing a gla ...
Electromagnetics is the study of Electric Fields and Magnetic Fields. The subject of electromagnetics seems like a very complicated subject. In college (University), the subject is taught in the 3rd y ...
Introduction to Mobile Phones and Radiation
When you talk on your cell phone, the phone must be communicated wirelessly with some base station that is hundreds of meters away. The phone communicates ...
On this page, we'll look at more special cases of the transmission line.
Short-Circuited Lines
Consider a transmission line of length L, but suppose the end of the line is short-circuited together ...
We are now aware of the fundamental properties of transmission lines, which are very important in electronics and antenna theory for microwave frequencies (anything above 600 MHz). On this page, we'll ...
We are now ready to determine the input impedance of a transmission line of length L attached to a load (antenna) with impedance ZA. Consider the following circuit:
In low frequency circuit theor ...
We are now aware of the characteristic impedance of a transmission line, and that the tx line gives rise to forward and backward travelling voltage and current waves. We will use this information to d ...
In this section, we'll form a model for transmission lines and then analyze the equations that govern their behaviour. We'll then introduce the key property of characteristic impedance.
To understand ...
Introduction to Transmission Lines
Transmission Lines - Models and Characteristic Impedance
Reflection Coefficient and VSWR
Input Impedance of Tx Lines
Quarter-Wave Transformers
More Uses ...
Dual-band impedance matching is introduced on this page via an example. Analyzing an actual antenna response on the Smith Chart (froma network analyzer) is also performed. Basically, if this page make ...
On the previous page, the immittance Smith Chart was introduced. On this page, we'll look at more impedance matching examples to illustrate the usefulness of the immittance Smith Chart.
We've introduced matching with transmission line sections and either series components or parallel components (inductors and capacitors). We should have noticed that the normal "impedance" Smith C ...
