Closed Boundary vs Open Boundary Quad-Ridge Horn Antennas

Closed Boundary Quad-Ridge Horn Antennas are broadband, dual-polarized horn antennas that incorporate metallic sidewalls around the aperture to better confine the radiated fields. The four ridges extend the operating bandwidth significantly compared to standard horn antennas, while the closed boundary structure reduces edge diffraction and improves radiation pattern symmetry.

These antennas are widely used in EMC compliance testing, antenna measurement systems, immunity testing, and broadband RF characterization where stable gain, high cross-polarization isolation, and repeatable far-field performance are required.

Open Boundary Quad-Ridge Horn Antennas utilize the same four-ridge structure to achieve ultra-wideband performance and dual polarization but without extended sidewalls at the aperture. The open design simplifies construction and reduces weight while maintaining broad frequency coverage.

They are commonly used for broadband RF measurements, pre-compliance EMC testing, antenna characterization, and general-purpose wideband applications where mechanical simplicity and cost efficiency are important considerations.