Circular Polarization Horn Antenna
Circular Polarization Horn Antenna provides stable circularly polarized radiation for microwave communication and antenna testing applications. Ideal for satellite communication systems, radar experiments, RF measurement setups and advanced microwave research.
High-Precision Circular Polarization Horn Antennas for Low-Axial-Ratio Radiation
AO Microwave’s high-precision circular polarization horn antennas are designed to radiate and receive circularly polarized signals (Left-Hand Circular - LHCP or Right-Hand Circular - RHCP) across broad frequency bands. Precision-fabricated from high-grade aluminum alloys, these antennas integrate a circular waveguide polarizer (using dielectric plates, septums, or corrugated walls) connected to a pyramidal or conical horn flare. Operating up to 40 GHz with standard SMA and 2.92mm (K) connector options, our circular polarization horns achieve an outstandingly low Axial Ratio of typically < 1.5 dB, low input VSWR of < 1.30:1, and flat gain curves across the band.
By utilizing precisely designed internal polarizers, our antennas convert the linear TE10 mode into a circular TE11 mode, ensuring highly stable circular radiation. They are critical for satellite ground tracking, space-to-ground telemetry, and helical antenna testing.
| Part No | Frequency/GHz | VSWR (Max) | Gain/dB (Avg) | Axial Ratio/dB (Max) | Polarization | Interface Type |
|---|---|---|---|---|---|---|
| AO0.5G1G-CPHA10NK | 0.5-1 | 2.5 | 7 | 3 | LHCP or RHCP | N Female |
| AO1G2G-CPHA10NK | 1-2 | 2.5 | 10 | 3 | LHCP or RHCP | N Female |
| AO1G4G-CPHA7NK | 1-4 | 2.5 | 7 | 3 | LHCP or RHCP | N Female |
| AO2G4G-CPHA10NK | 2-4 | 2.5 | 10 | 3 | LHCP or RHCP | N Female |
| AO4G8G-CPHA10NK | 4-8 | 2.5 | 10 | 3 | LHCP or RHCP | N Female |
| AO8G18G-CPHA10SK | 8-18 | 2.5 | 10 | 5 | LHCP or RHCP | SMA Female |
| AO18G40G-CPHA102.92K | 18-40 | 2.5 | 10 | 5 | LHCP or RHCP | 2.92mm Female |
The Electromagnetics of Waveguide Polarization Rotation
Circular polarization horn antennas operate by shifting the phase of orthogonal wave components. In standard waveguide runs, the signal propagates as a linearly polarized TE10 mode. To generate circular polarization, this linear wave must be split into two orthogonal components with a 90-degree phase shift.
To achieve this phase shift, AO Microwave integrates a precision waveguide polarizer inside the horn feed section. By using a dielectric plate polarizer inserted at a 45-degree angle inside a circular waveguide run, we slow down the wave component parallel to the plate. This delay introduces the required 90-degree phase shift, transforming the linear wave into a circular TE11 mode before it flares out of the horn.
Target Applications & Operational Advantages
By providing low axial ratios and high gain, our circular polarization horn antennas secure critical communication and tracking setups:
Satellite Tracking Ground Stations
Function: Transmits and receives circularly polarized carrier signals (LHCP/RHCP) to track orbiting satellites.
Advantage: Stable, low axial ratio (<1.5 dB) prevents polarization mismatch losses caused by satellite attitude changes or atmospheric Faraday rotation.
Space-to-Ground Telemetry
Function: Receives telemetry and command signals from launch vehicles and research payloads.
Advantage: Exceptional polarizaton purity minimizes signal fading, ensuring continuous communication links during flight.
Helical Antenna Calibration Ranges
Function: Serves as a calibrated reference standard to verify the circular polarization of other antennas.
Advantage: Highly precise gain calibration and low input VSWR (<1.30) ensure accurate, repeatable measurements.
Circular Polarization Horn Antenna FAQs
Need high-performance Circular Polarization Horn Antennas?
Specify your frequency band, polarization (LHCP/RHCP), nominal gain, and connector interface — we'll quote in 24 hours.
