Antennas do not radiate equally in all directions. Grow a dipole and watch its beam narrow and side lobes appear in the polar pattern.
Antenna Radiation PatternLive
dipole directivity
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A dipole radiates most strongly broadside and nulls off its ends. As it grows past one wavelength the main lobe narrows and side lobes appear — trading a wider beam for more directivity. Educational tool.
Reading this result: The half-wave dipole is the sweet spot: a single clean broadside lobe with the classic ~2.15 dBi gain and no side lobes to waste power.
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How it works
A dipole radiates most strongly broadside to its axis and nulls off its ends. The E-plane pattern follows [cos(πL·cosθ) − cos(πL)]/sinθ. As length grows past a wavelength the main lobe narrows (higher directivity) but side lobes emerge. Educational tool.
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Is this dipole antenna pattern simulator tool really free?▾
Yes. Antenna Radiation Pattern runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
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The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.