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For Students · Antenna Pattern

Antenna Pattern for a DC motor

Built for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition. Simulate a DC motor live below — adjust the inputs and watch it respond, right in your browser.

Antenna Radiation PatternLive

dipole directivity

Controls

Presets

Dipole length (wavelengths)

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.

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Data Inspector

Length0.50 λ

Relative directivity3.0 dB

Patternsingle broadside lobe

Governing equation

E (θ) = \frac{cos ( π L cos θ ) - cos ( π L )}{sin θ}, L = 0.50 λ

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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Frequently asked questions

Is this good for students?: Yes — this version of "Antenna Pattern for a DC motor" is framed for students learning it for a class or exam. See the concept move instead of memorizing formulas — and check your homework intuition.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.