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Small broadband antenna (3 to 30 MHz)

July 21, 2023
Q13.560-JXS53-30-30/30-LF
Small broadband antenna (3 to 30 MHz)
A short dipole antenna and an impedance converter can be combined to rotate an interference signal. The converter provides a huge current gain so that the voltage at the dipole output ultimately drives a 75Ω load.
Frequency range: This antenna can cover the frequency range from 3MHz to 30MHz, which makes it very useful in a variety of applications, especially in situations where multiple frequency bands need to be covered or broadband communication is required.
Design principle:
Some small broadband antenna designs use two radiators connected to each other to obtain a bandwidth greater than the theoretical bandwidth boundary.
For example, a design may include a ground plane, a feed unit, a disk-loaded radiator, and a spiral radiator. The disk-loaded radiator consists of a disk and a short-circuit pin, while the spiral radiator is wrapped around the short-circuit pin.
The feed unit transfers radio frequency (RF) energy from an external device to the spiral radiator.
Application:
This antenna is particularly useful in ionospheric shortwave detection systems for transmitting ionospheric detection signals. Ionospheric shortwave detection systems are often used to study the effects of the ionosphere on shortwave propagation and for long-range detection.
Due to its broadband characteristics, this antenna is also suitable for military security communication systems that need to cover multiple communication bands.
Performance characteristics:
It has good broadband frequency response characteristics and can maintain stable performance over a wide frequency range.
By optimizing the design using methods such as genetic algorithm (GA) and method of moments (MOM), precise control of the current distribution on the loaded antenna can be achieved, thereby further improving its performance.
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