Horn antennas are high-gain, broadband directional antennas that are fairly easy to manufacture. They work by concentrating RF energy down to a focal point.
Horn Antennas
Tag: Antenna Theory
Antenna Parameters: Length
In this post we discuss antenna length, how it is important relative to antenna efficiency and how the optimal antenna length is dependent on the wavelength.
Antennas and Efficiency
Antenna efficiency, not to be confused with VSWR, is a measure of how effectively an antenna is actually radiating power, as opposed to merely absorbing or reflecting it.
The Difference Between Absorption and Reflection
In this article we investigate how absorption and reflection of RF energy behaves. We also discuss how absorption and reflection can affect antenna performance.
How Sensitive is This Antenna?
Though there is no basic antenna property of sensitivity, in this post we investigate what is often meant by sensitivity and how it relates to actual antenna parameters.
Antenna Feeds: Cables & Lines
In this post, we discuss the several types of wire antenna feeds, and how they should be used and handled to ensure proper operation.
Designing an Antenna: The Requirements
In this post we discuss how optimizing one characteristic of an antenna can negatively affect other aspects of an antenna's performance, and how this relates to new designs.
How Parabolic Dishes Work
The parabolic dish is a means by which the gain of an antenna can be significantly increased by intercepting and concentrating RF at a focal point.
Antennas and Efficiency
If an antenna is inefficient, more transmitting power must be supplied to compensate. Making an antenna efficient therefore enhances range and saves power.
Designing Multiband Antennas
Occasionally, we want a device to have only one antenna that can operate in several specific bands, as distinct from an antenna which covers a broad range of frequencies.
Why 50 Ohms?
Why 50 ohms represents the best compromise between low attenuation and maximum power transfer, leading to its becoming a standard impedance for RF work.
What is the Significance of Lambda/4
Lambda/4 is the ideal length for the arms or the height of many antennas. In this post we explain why this size is so important electrically for most antennas.
How Do You Determine What Type of Antenna You Need?
How do you determine what type of antenna you need for an application? Each antenna type has different characteristics suitable for some applications and not for others.
The Chu Limit
The Chu-Herrington theorem states that for an antenna of a given size there is a minimum limit to the Quality Factor (Q). This limit is called the Chu Limit.
Why Antennas Need a Ground Plane
In this post we discuss what the purpose of a ground plane is, how it works with an antenna, and why some antennas require a ground plane while others do not.
ARSI 
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