A stable and low-cost site source for conducted- and radiated-emission consistency confirming and daily checking of test sites

In this paper, a new and low-cost design of site source with long-term stability is proposed. The site source is especially suitable for the daily site checking and the consistency confirming at different test sites. For these applications, the site source is highly required to be stable due to various test sites and long-term usage. Two crystal driven oscillators together with well-designed circuits, powered by AC, can generate fast and stable periodic trapezoidal waveforms, resulting in harmonic signals ranging from 150 kHz to 1 GHz. This indicates that the site source can be applied not only for the radiated-emission (RE) test from 30 MHz to 1 GHz but also for the conducted-emission (CE) test from 150 kHz to 30 MHz. For demonstration, the site-source prototype was created and measured. The measurement was performed inside a standard 10-m semi-anechoic chamber to show the attractive performance of frequency accuracy, output-power stability and radiation symmetry of the newly developed site source.