Millimeter-Wave Spectrum Analysis

Millimeter-wave spectrum analysis using frequency extension harmonic mixers

Millimeter-wave (mm-wave) measurements require the same fundamental tools that engineers use for the RF & microwave spectrum. Frequency extension of a microwave spectrum analyzer or signal analyzer is possible up to 0.325 Terahertz (THz). The key enabler for millimeter-wave measurements is harmonic mixer technology. With a harmonic mixer connected to your spectrum analyzer you can overcome the inherent microwave limitations of your instrument allowing you to perform accurate millime­ter-wave measurements.

Millimeter-wave measurements are essential for research into next generation tech­nology in areas such as radio astronomy, imaging, communication, semiconductors, space research, biomedical and homeland security. With a spectrum from 30 GHz to 325 GHz, and greater, the complexity of measurements requires specialized solutions, especially as the wavelengths approach sub-millimeter in length.

OML provides harmonic mixers that connect externally to the Keysight PSA spec­trum analyzers or PXA and 32 or 44 GHz EXA signal analyzers for mm-wave band measurements. The external mixer extends the frequency range of the analyzers into the mm-wave bands. By using an external module the connections to the device-un­der-test (DUT) are closer giving improved dynamic range. It can be interfaced to the DUT via over-the-air, on-wafer, or via waveguide connections. The waveguide inter­face is compatible with MIL-DTL-3922/54 and MIL-DTL-3922/67D.

Once connected, the OML harmonic mixers utilize the predetermined RF, LO and IF to effectively multi­ply the PSA, PXA, or EXA micro­wave capabilities to the mm-wave spectrum. The familiar front panel operation for setup, calibration, measurement, and output are the same, except the readouts are in the mm-wave instead of microwave spectrum.

Millimeter-Wave Spectrum Analysis

The Keysight PXA or EXA (32 or 44 GHz) is plug-and-play compatible with the MxxHWDX series of harmonic mixers from OML. With electronic CSV data, this part number simplifies import of correction factors to the PXA or EXA. Similarly, the Keysight PSA is compatible when configured with an external diplexer (DPL-26). One popular application is FCC Part 15 emissions compliance testing from 40 GHz to 200 GHz, which is conducted when using additional standard gain horn antennas with harmonic mixers.

OML’s external harmonic mixers when combined with an Keysight PSA spectrum analyzer, PXA or EXA signal analyzer allow you to extend the frequency range of your instruments to perform accurate measurements on your millimeter wave band circuits and devices.