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Helical Antennas

Helical antennas use a spiral conductor geometry to produce directional or circularly polarized RF radiation. They are used in satellite communication, GNSS, telemetry, tracking links and compact microwave terminals.

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Helical RF antenna for circularly polarized microwave links

FAQ

How should linear, circular, axial-ratio and cross-polarization requirements be specified?

Define linear orientation or circular sense, the viewing and coordinate convention, axial ratio, cross-polar limits and the frequency and angular region where they apply.

How are antenna VSWR, return loss, reflection coefficient and mismatch loss related?

VSWR, return loss and reflection coefficient express port mismatch; mismatch loss quantifies the accepted-power penalty, but none proves radiation efficiency or pattern.

What is the difference between antenna gain, directivity, beamwidth and sidelobes?

Directivity describes angular concentration, gain includes dissipative efficiency, beamwidth describes main-beam extent and sidelobes describe radiation outside that beam.

Why can an installed antenna pattern differ from the free-space data sheet?

Ground planes, structures, cables, radomes and mounting tolerances change current distribution and scattering, which can alter match, gain, pattern, polarization and phase center.

Engineering inquiry

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Helical antennas

Helical antennas use a spiral conductor structure that can produce circular polarization and controlled beam behavior in a compact mechanical form. They are often used where antenna orientation, signal rotation or moving terminals make linear polarization less practical.

Circular-polarized RF links

Important data includes frequency band, polarization handedness, axial ratio, gain, beamwidth, VSWR, impedance, power handling, connector interface, radome option and mounting method. These details matter in satellite communication, GNSS receivers, telemetry links, tracking systems and compact microwave terminals.