ELVA-1 reports increasing demand for solid-state noise sources designed to support measurement and calibration at millimeter-wave and sub-terahertz frequencies, reflecting broader growth in high frequency research across academia and industry. As development efforts accelerate in areas such as 6G wireless communications, high-resolution imaging, spectroscopy, radio astronomy and advanced detector technologies, engineers are placing greater emphasis on stable, well-characterized noise references operating well beyond 100 GHz.
According to ELVA-1, noise sources in university and research laboratories are now used for a wider range of tasks than traditional receiver noise-figure measurements. In addition to classical Y-factor testing, they are increasingly applied to front-end validation, comparative benchmarking of emerging device technologies, and ensuring long-term repeatability in experimental setups operating in the 140 to 330 GHz range. At these frequencies, predictable and repeatable noise references are critical to achieving reliable results.
ELVA-1 has observed that in the WR-05 (140 to 220 GHz) and WR-03 (220 to 330 GHz) waveguide bands, the dominant constraint in many practical measurement setups is not the test methodology itself, but the available noise power at the receiver input after accounting for real-world losses. Compact sub-THz front ends typically incorporate multiple waveguide components, transitions and interconnects, each contributing insertion loss. Filters, adapters, and extended waveguide runs can reduce the effective excess noise ratio (ENR) at the measurement plane by several decibels.
At the same time, receiver noise figures at sub-terahertz frequencies remain significantly higher than those at lower microwave bands. This elevated system noise floor increases sensitivity to drift and uncertainty, particularly when the injected noise does not provide sufficient contrast. When effective ENR at the receiver input is too low, Y-factor measurements and related calibration techniques lose margin, repeatability degrades, and results can become dominated by setup-dependent effects rather than the intrinsic performance of the device under test.
High-ENR solid-state noise sources are increasingly viewed as a requirement rather than a convenience for WR-05 and WR-03 measurements. Adequate ENR headroom allows engineers and researchers to tolerate unavoidable path losses while maintaining stable calibration conditions. This margin is particularly important when comparing results across different test setups, laboratories or development phases.
To address these challenges, ELVA-1 has expanded its ISSN family of solid-state noise sources targeting mmWave and sub-THz research applications. The company’s ISSN-05 and ISSN-03 models cover the WR-05 and WR-03 waveguide bands, spanning 140 to 220 GHz and 220 to 330 GHz, respectively. According to the company, these sources offer full-band waveguide coverage with high ENR levels of up to approximately 35 to 40 dB, along with stable spectral noise density across the operating band.
The company says these performance characteristics are intended to support receiver characterization and front-end calibration in practical laboratory environments where losses from waveguide components and interconnects cannot be avoided. Interest has been particularly strong from academic and research users working with compact sub-THz front ends, where maintaining sufficient ENR at the receiver input can be a key factor in achieving stable and repeatable measurements.
In addition to its WR-05 and WR-03 offerings, ELVA-1 also supplies precision-calibrated solid-state noise sources covering the 26.5 to 170 GHz frequency range. The company positions these products as part of a broader portfolio aimed at enabling consistent measurement workflows as research and development activity moves toward higher frequencies.
The growing adoption of solid-state noise sources is viewed as part of a broader shift in high-frequency measurement practice. As research pushes further into the sub-terahertz regime and performance margins tighten, the company expects dependable high-ENR noise references to play an increasingly central role in enabling credible, repeatable and comparable results in advanced mmWave and sub-THz systems.