A programmable ultra-low noise X-band exciter

Area of Science:

• Electrical Engineering
• Microwave Engineering
• Signal Processing

Background:

• Achieving ultra-low noise signal generation in the X-band is critical for advanced radar, communication, and scientific applications.
• Existing microwave synthesizers often present limitations in phase noise performance, hindering the capabilities of sensitive systems.
• The development of cost-effective, high-performance exciters remains an ongoing challenge in microwave engineering.

Purpose of the Study:

• To develop and demonstrate a programmable ultra-low noise X-band exciter.
• To achieve phase noise performance significantly better than commercially available microwave synthesizers.
• To utilize commercial off-the-shelf (COTS) components for a cost-effective solution.

Main Methods:

• Integration of an X-band sapphire-loaded cavity oscillator (SLCO) as the primary low-noise source.
• Incorporation of a low-noise UHF frequency synthesizer for programmability and fine frequency control.
• Utilizing specialized frequency translation and up-conversion circuitry to achieve the desired X-band output.

Main Results:

• The developed exciter exhibits phase noise more than 10 dB below the best available microwave synthesizers.
• The device operates in the X-band, covering a 7% frequency range with a high resolution of 0.1 Hz.
• A stable X-band output power of +23 dBm was achieved.

Conclusions:

• A novel programmable ultra-low noise X-band exciter has been successfully realized using COTS components.
• The demonstrated phase noise performance represents a significant advancement over current state-of-the-art microwave synthesizers.
• This development offers a promising solution for applications demanding exceptionally low phase noise in the X-band.