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: Efficiency
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.
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.
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.
Antennas As Part of a Receiver: Part 2
Historic progress of in the use of an antenna as part of a radio's tuning, how they were overcome, and a clever solution featuring a loop antenna which is still used today.
Antennas as Part of a Receiver
The very narrow bandwidth of small, highly resonant antennas can be used to create a tuning circuit for a radio receiver. Here's how it was done in the early days of radio.
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.
VSWR in Antenna Design
VSWR is an important antenna parameter in antenna design that is related to how much of the power sent to the antenna is reflected back to the source.
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.
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.
Principles of Antenna Gain
Since antennas are passive devices, do they really have gain? In this post we explore what antenna "gain" actually is and how it is achieved.
ARSI 
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