All of the parameters in a rectangular patch antenna design (L, W, h, permittivity) control the properties of the antenna. As such, this page gives a general idea of how the parameters affect performa ...
Inset Feed
Previously, the patch antenna was fed at the end as shown here. Since this typically yields a high input impedance, we would like to modify the feed. Since the current is low at the ends ...
In this section, we'll discuss the microstrip antenna, which is also commonly referred to as the patch antenna. The rectangular patch antenna is analyzed, and what is learned here will be applied to ...
The small loop antenna is a closed loop as shown in Figure 1. These antennas have low radiation resistance and high reactance, so that their impedance is difficult to match to a transmitter. As a resu ...
A folded dipole is a dipole antenna with the ends folded back around and connected to each other, forming a loop as shown in Figure 1.
Figure 1. A Folded Dipole Antenna of length L.
Typically, t ...
A monopole antenna is one half of a dipole antenna, almost always mounted above some sort of ground plane. The case of a monopole antenna of length L mounted above an infinite ground plane is shown in ...
A standard rule of thumb in antenna design is: an antenna can be made more broadband by increasing the volume it occupies. Hence, a dipole antenna can be made more broadband by increasing the radius A ...
The half-wave dipole antenna is just a special case of the dipole antenna, but its important enough that it will have its own section. Note that the "half-wave" term means that the length of this ...
In this section, the dipole antenna with a very thin radius is considered. The dipole antenna is similar to the short dipole except it is not required to be small compared to the wavelength (at the fr ...
The short dipole antenna is the simplest of all antennas. It is simply an open-circuited wire, fed at its center as shown in Figure 1.
Figure 1. Short dipole antenna of length L.
The words " ...
Obtaining an intuitive idea for why antennas radiate is helpful in understanding the fundamentals of antennas. On this page, I'll attempt to give a low-key explanation with no regard to mathematics on ...
Antenna Temperature () is a parameter that describes how much noise an antenna produces in a given environment. This temperature is not the physical temperature of the antenna. Moreover, an antenna do ...
On this page, we introduce one of the most fundamental equations in antenna theory, the Friis Transmission Equation. The Friis Transmission Equation is used to calculate the power received from one an ...
A useful parameter calculating the receive power of an antenna is the effective area or effective aperture. Assume that a plane wave with the same polarization as the receive antenna is incident upon ...
Polarization of Plane Waves
Polarization (or Polarisation for our British friends) is one of the fundamental characteristics of any antenna. First we'll need to understand polarization of plane wave ...
