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Reflectance
A measure of the reflected signal relative to the signal incident upon the component. Reflectance is expressed as a negative value. A value of -55 dB means the reflected signal is 55 dB LESS than the transmitted signal. The smaller (more negative) the reflectance value, the better the performance. For example, a reflectance of -65 dB is better than a value of -55 dB.