For better manufacturability, printed circuit boards (PCB) typically have periodic planar metallic structures, known as copper balance structures. Copper balance structures are non-functional such that they play no signal processing or computational role. However, with advancing operating frequencies, copper balance structures can start behaving as frequency-selective surfaces (FSS) in bands that overlap with operating frequencies, causing parasitic effects, e.g., attenuation of desired signals, pickup of undesired signals, undesired radiation, etc. Per techniques of this disclosure, copper added to PCBs for the purpose of copper balance is made of aperiodic structures. The aperiodicity of copper balance structures militates against the formation of resonant frequencies, reducing or eliminating parasitic effects.
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N/A, "Frequency Non-selective Structures for Copper Balance in PCBs", Technical Disclosure Commons, (June 24, 2020)