Velocity factor must be between 0.9 and 1.0.
'; return; } // Constants const speedOfLight = 299792458; // m/s const wavelength = speedOfLight / (frequency * 1e6); // wavelength in meters const quarterWave = (wavelength / 4) * velocityFactor; // quarter wavelength in meters const radialLength = quarterWave * 1.1; // radials 10% longer for ~50Ω match let radiatorOutput, radialOutput; if (units === 'metric') { // Metric calculations const radiatorMeters = quarterWave.toFixed(3); const radiatorCm = (quarterWave * 100).toFixed(1); const radialMeters = radialLength.toFixed(3); const radialCm = (radialLength * 100).toFixed(1); radiatorOutput = `${radiatorMeters} meters (${radiatorCm} cm)`; radialOutput = `${radialMeters} meters (${radialCm} cm)`; } else { // Imperial calculations const metersToFeet = 3.28084; const metersToInches = 39.3701; const radiatorFeet = (quarterWave * metersToFeet).toFixed(2); const radiatorInches = (quarterWave * metersToInches).toFixed(1); const radialFeet = (radialLength * metersToFeet).toFixed(2); const radialInches = (radialLength * metersToInches).toFixed(1); radiatorOutput = `${radiatorFeet} feet (${radiatorInches} inches)`; radialOutput = `${radialFeet} feet (${radialInches} inches)`; } // Display results resultsDiv.innerHTML = `Results:
Vertical Radiator Length: ${radiatorOutput}
Radial Length (each): ${radialOutput}
Note: Cut elements slightly longer (5-10%) for tuning. Radials are angled at ~45° for 50Ω impedance match.
`; }Ground plane antennas are super cool because they have a flat base with rods sticking out, like a mini umbrella. They’re great for radios and scanners. Our Ground Plane Antenna Calculator is coming soon to help you build one. It’s like a helper that makes it easy and fun!
This calculator tells you how to make a ground plane antenna. You tell it the frequency, like for a ham radio or scanner. Then, it figures out how long the main rod and the base rods (called radials) should be. It’s like getting a recipe for a perfect antenna!
Ground plane antennas are used in things like CB radios or home radio setups. They’re great because they’re simple and send signals in all directions. The calculator makes sure your antenna works great by giving you the right sizes. You just enter a few numbers, and it does the math.
For example, you might type in a frequency like 144 MHz for a ham radio. The calculator will say, “Make the main rod 20 inches long and the radials 22 inches.” It might also tell you how to angle the radials for the best signal. The instructions are super easy to follow.
This tool is great for kids, students, or anyone who loves radios. Maybe you’re building an antenna for a school project or setting up a radio at home. The calculator helps you get it right without needing to be a math expert. It’s like having a guide who knows all about antennas!
Our Ground Plane Antenna Calculator will work on your phone, tablet, or computer. It’s made to be really simple, so even beginners can use it. You just type in a number, and it gives you the answer in inches or centimeters. You can also try different frequencies to see how the sizes change, which is fun to explore.