Anechoic chamber.
M. Samsuzzaman, M. T. Islam, Haslina Arshad, J. S. Mandeep, N. Misran
CC BY 4.0
M. Samsuzzaman et. al. "Circularly Polarized S Band Dual Frequency Square Patch Antenna Using Glass Microfiber Reinforced PTFE Composite", The Scientific World Journal <a rel="nofollow" class="external text" href="https://doi.org/10.1155/2014/345190">doi:10.1155/2014/345190</a>