Abstract
This work reports on a wideband near-zone radiative signal collector system operating from 1 to 50 GHz for capturing electromagnetic emission from a community of bacteria in a petri dish or any other distributed sources confined in a small focusing area. The system includes a dual-polarized signal collector, broadband Low Noise Amplifiers (LNAs) and a precision spectrum analyzer. The signal collector is composed of a quad-ridged horn-type structure of dimensions λ L × λ L × 1.6 λ L (where λ L is the wavelength at the lowest frequency) having two orthogonal probes. The provision of a dielectric cone along the horn central axis allows for collimating the waves in the focusing area over the entire bandwidth. The signal collector acts as a field concentrator to provide a uniform field distribution across the focusing area (source location) over the entire band. The structure is EM-shielded to exclude outside radiation. The collector is also designed to be resonance-free for uniform collection of the electromagnetic spectrum.
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