In the world of FPV flying, every detail matters, especially when it comes to communication and controlling your drone. One interesting solution that has gained popularity among enthusiasts is the Moxon antenna. Although it was proposed back in 1993, its advantages remain relevant to this day. Let’s break down what this antenna is, how it works, and why it’s still important in modern times.
A Bit of History
The Moxon antenna was introduced by engineer and radio enthusiast Les Moxon from England. Its uniqueness lies in its simple design and high performance. Moxon proposed an antenna with two elements, which was reduced by 25% in size due to bending. One of its key advantages is its impedance of 50 ohms, allowing it to be directly connected to a cable without additional components.
How Does the Antenna Work?
The Moxon antenna consists of two parts: the director (the radiating part that directs the signal) and the reflector (the reflecting part that boosts the signal in the desired direction). It’s important to note that the antenna’s polarization is linear. If the antenna is positioned horizontally, the polarization will also be horizontal. This is critical in FPV systems, where matching the polarizations can significantly improve signal quality.
Advantages of the Moxon Antenna
- Wide frequency range. The antenna can operate over a broad range of frequencies, making it a versatile solution for various radio systems.
- Direct cable connection. Thanks to its 50-ohm impedance, the antenna can be easily connected to a transmitter or receiver, simplifying its installation.
- Signal boost. Although the Moxon antenna doesn’t offer a high gain (around 5-7 dBi), it still doubles the signal strength, which is crucial in areas with weak radio coverage.
- Easy to build. The antenna can be easily made, even at home. For high-frequency applications, it can be etched onto a PCB, making it ideal for DIY projects.
- Simple calculations. The Moxon antenna design is easy to calculate using basic antenna calculators, making it accessible to both hobbyists and professionals.
Application in FPV
The Moxon antenna has found its place in FPV systems due to its compact size and directional capabilities. It helps improve the quality of communication and control over a drone’s range. This antenna is particularly useful for long-distance flying, where signal amplification in a specific direction is necessary.
Why is the Moxon Antenna Relevant Again?
In recent years, the Moxon antenna has regained attention from radio enthusiasts and experts because it can easily be adapted for new frequency bands. For example, many are now modifying it to work in ELRS (ExpressLRS) frequency ranges, which is especially important for FPV systems where every second of signal delay can affect the drone’s control. Our adversaries have also started mass-modifying this antenna for lower frequency ranges, making it a relevant tool in modern conflicts.
Conclusion
The Moxon antenna is a prime example of simplicity and effectiveness working hand in hand. Its advantages make it an ideal choice for those who want to improve their drone’s communication without delving into complex engineering solutions. Its ease of construction, reliability, and adaptability to new frequencies make this antenna an excellent choice for modern FPV systems.
