Broadband Circular Polarized Horn Antenna-Dual Linear Polarization Synthesized

This broadband circularly polarized horn antenna adopts the configuration of wideband dual orthogonal linear polarized horn plus external broadband 90° hybrid coupler.

It utilizes external amplitude and phase control instead of narrowband built-in waveguide polarizers,

to achieve high-performance circular polarization with ultra-wide bandwidth, high isolation and switchable polarization rotation.

It is currently the optimal engineering solution for broadband microwave and millimeter-wave circularly polarized antennas.

Core Working Principle

Dual-Linear Polarization Orthogonal Synthesis

Two sets of orthogonally arranged linearly polarized antennas (horizontal and vertical) transmit or receive electromagnetic waves simultaneously. A fixed 90° phase difference is introduced between the two orthogonal signals to synthesize circularly polarized waves. This design eliminates the need for complex built-in polarizers adopted in traditional circularly polarized antennas, simplifying mechanical structure and reducing overall cost.
Broadband Performance Implementation

The horn inherently provides a wide bandwidth ratio of 10:1 to 20:1, realized by the following methods:

Non-resonant structure: No resonant components are contained inside the antenna, effectively reducing frequency sensitivity;
Tapered transition design: Continuous gradient geometry from waveguide to horn aperture optimizes broadband impedance matching and minimizes reflection loss;
Multi-mode excitation: Higher-order modes such as TE₁₁ and TM₁₁ are excited within the horn. Effective mode superposition further broadens the operating frequency range.

Specifications