RM-SGHA10-25 Standard Gain Horn Antenna for 75–110 GHz W-Band Applications

Precision Performance for W-Band RF Measurement

At millimeter-wave frequencies, every component in the measurement chain matters. Small impedance mismatches, unstable radiation patterns, or unwanted polarization components can quickly affect test accuracy. The RF MISO RM-SGHA10-25 Standard Gain Horn Antenna is engineered for applications across 75 to 110 GHz, providing a stable and highly directional antenna solution for engineers working in the W-band.

Built around a WR10 waveguide interface, the RM-SGHA10-25 combines wide frequency coverage with 25 dBi typical gain and 1.1:1 typical VSWR. This combination helps deliver efficient RF energy transfer while maintaining strong directivity across the operating range. The antenna uses linear polarization and specifies 50 dB cross-polarization isolation, supporting measurements where polarization discrimination is an important part of system performance.

High Directivity Across 75–110 GHz

A standard gain horn is most valuable when its radiation behavior remains predictable as frequency changes. The simulation data supplied for the RM-SGHA10-25 shows gain increasing progressively across the band, from approximately the mid-25 dBi range at the lower end toward more than 27 dBi near 110 GHz.

This directional behavior is also reflected in the radiation patterns. At 75 GHz, 92.5 GHz, and 110 GHz, the simulated patterns maintain a clearly defined main beam, while the beam becomes narrower as frequency increases. The reported 3 dB beamwidth values illustrate this progression, providing engineers with useful reference data when evaluating angular resolution, alignment requirements, and measurement geometry.

Low Reflection for Cleaner Measurement Chains

At W-band frequencies, good impedance matching becomes especially important because losses and reflections can easily influence the overall measurement uncertainty.

The RM-SGHA10-25 is specified with a typical VSWR of 1.1:1, and the simulation curve in the datasheet remains close to unity throughout the 75–110 GHz operating range. This low-reflection behavior helps reduce unwanted standing-wave effects and allows more of the available RF power to reach the antenna aperture.

For laboratory setups and millimeter-wave test systems, this means the antenna can serve as a stable radiating or receiving element where repeatability and controlled RF behavior are important.

Strong Polarization Purity

The antenna's linear-polarization design is complemented by high cross-polarization isolation. The specification lists 50 dB cross-polarization isolation, while the accompanying simulation data provides additional insight into polarization discrimination across the operating band.

High polarization isolation is particularly valuable when engineers need to distinguish the desired polarization component from unwanted orthogonal energy. Rather than focusing only on gain, this additional characteristic gives a more complete picture of antenna performance in precision RF measurements.

Compact, Lightweight and Built for Millimeter-Wave Integration

Despite its high-frequency capability, the RM-SGHA10-25 remains compact. The C-type configuration measures approximately 82.5 × 26.09 × 33.68 mm and weighs only 0.03 kg. Its copper construction with a gold-plated finish combines electrical conductivity with a professional millimeter-wave component design.

The datasheet also indicates both waveguide/flange and connector-interface configurations, giving engineers additional flexibility when integrating the antenna into different RF setups.

With its 75–110 GHz coverage, 25 dBi typical gain, low VSWR, strong polarization isolation, and compact WR10 architecture, the RM-SGHA10-25 provides a precise and practical standard gain horn solution for demanding W-band RF and antenna measurement environments.