Parasitic Arrays in HAM Radio: All You Need to Know

Today in this article, we will briefly discuss the parasitic arrays. If you don’t know about the parasitic arrays, you don’t need to worry. I hope this article will help you gain some knowledge about the parasitic arrays in HAM Radios.

The parasitic array comprises more than one element, and these elements are known as parasitic elements, those elements that depend on other’s feed. These parasitic elements do not have their feed, so they depend on others. So, to increase the radiations indirectly, these parasitic elements are used to make them parasitic arrays.

Construction And Working

Parasitic arrays are one of the most important parts of the HAM radios, and they help increase the radiations and help make better connections. The magnitude and phase are adjusted in each element to get the desired pattern of radiations. But it is not possible to adjust the magnitude and phase-in each element working independently. As a result, you will not be able to find the perfect match to the lines of transmission that work to carry the power to the elements.

There are many important parts of parasitic arrays, and each part performs its functions. Let’s discuss these different parts and workings of the parasitic arrays in HAM radios.

1. Driven Element

All the antennas radiate individually and are also combined in an array. When we sum up all the radiations of these antennas, then we will obtain a radiation beam. It is only possible when all the elements are connected in a feed. And a small dipole is also used to connect the feed, which is known as a driven element.

2. Parasitic Elements

Other than the driven elements, one of the most important elements known as parasitic elements is also used in the parasitic array, and they have their functions. Then they are positioned in such a way that they lie between the driven elements. But they are not connected to the driven elements, and they don’t have any electrical connection with the driven element and the feed. So there are two main parts of the parasitic elements, which are:

  • Reflector

It is a part of a parasitic element, and it is a bit longer than the driven element. The main function of the reflector is to reflect energy towards the radiations, and it does it while acting as a concave mirror.

The information mentioned above wall all you need to know about the parasitic arrays in HAM radios. They are also used in Quad antennas and other radios.

  • Director

This parasitic element is a bit shorter than the driven element. It receives the energy, and it tries to increase the radiation towards itself. A lot of o directors are used in the parasitic array to increase the directivity.

3. Boom

All the parts mentioned above are placed on an element which is called a boom. It acts as an insulator as it is made of a nonmetallic material, and it is safe from any kind of short-circuiting. All the parts of parasitic arrays such as reflector, directors, and driven elements are placed on the boom, which is an insulator. The frequency of arrays is from 2MHz and above, and they are used to get high directivity.