The previous page introducing slot antennas was primarily theoretical (giving you an intuitive idea of how slot antennas work); however, since it was about an infinite conducting plane it is not entir ...
Slot antennas are used typically at frequencies between 300 MHz and 24 GHz. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation pa ...
We discuss the properties of Log Periodic Antennas on the previous Log Periodic Tooth Antenna page. Now we expand on that design further and introduce the Log-Periodic Dipole Antenna Array (sometimes ...
Log-Periodic antennas antennas are designed for the specific purpose of having a very wide bandwidth. The achievable bandwidth is theoretically infinite; the actual bandwidth achieved is dependent on ...
Bow-Tie antennas aren't really Log Periodic antennas; however, the bow tie (or butterfly) antenna makes a good starting point to begin talking about Log-Periodic antennas. So we will first discuss pro ...
Spiral antennas belong to the class of "frequency independent" antennas; those with a very large bandwidth. The fractional Bandwidth can be as high as 30:1. This means that if the lower frequency ...
The design of a Yagi-Uda antenna is actually quite simple. Because Yagi antennas have been extensively analyzed and experimentally tested, the process basically follows this outline:
Look up a table ...
The Yagi-Uda antenna or Yagi Antenna is one of the most brilliant antenna designs. It is simple to construct and has a high gain, typically greater than 10 dB. The Yagi-Uda antennas typically operate ...
Helix antennas (also commonly called helical antennas) have a very distinctive shape, as can be seen in the following picture.
Photo of the Helix Antenna courtesy of Dr. Lee Boyce.
The most popula ...
In this section, the 3d radiation patterns are presented to give an idea of what they look like. This example will be for a parabolic dish reflector with the diameter of the dish D equal to 11 wavelen ...
The fields across the aperture of the parabolic reflector is responsible for this antenna's radiation. The maximum possible gain of the antenna can be expressed in terms of the physical area of the ap ...
The most well-known reflector antenna is the parabolic reflector antenna, commonly known as a satellite dish antenna. Examples of this dish antenna are shown in the following Figures.
Figure 1. The ...
To increase the directivity of an antenna, a fairly intuitive solution is to use a reflector. For example, if we start with a wire antenna (lets say a half-wave dipole antenna), we could place a condu ...
Antenna designers are always looking for creative ways to improve performance. One method used in patch antenna design is to introduce shorting pins (from the patch to the ground plane) at various loc ...
On this page, I will present a movie showing the fields under a microstrip antenna. In this numerical experiment, a short pulse will be launched from the end of a microstrip, which will travel towards ...
