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FR4Flame Retardant 4 (printed circuit boards)
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On the other hand, for the FR4 based circuit, the interface between materials can be clearly seen, where the latticed structure of the latest layers of the fiber matrix that form the composite FR4 can be distinguished.
When the gap is filled with FR4 then it operates at dual frequencies 3.1 and 4.17GHz with return loss -17.6386 and -17.3635dB respectively.
In the case of specimen FR4 where boundary condition BC3 was applied, the stiffness degradation was more intensive ([n.sub.average] = 0.73) than in cases of FR6 (BC1; [n.sub.average] = 0.54) and FR8 (BC2; [n.sub.average] = 0.44).
Shelley, "The microwave and RF characteristics of FR4 substrates," in Proceedings of the IEE Colloquium on Low Cost Antenna Technology, pp.
All FR4 substrates with TSRR and WS are centered in the waveguide.
The FR4 board, whose influence on antenna performance is illustrated in the succeeding chapters, was omitted in the early simulation process.
The DUT (micro-strip line, width is 0.2 mm, and length is 20 mm) is at layer three, 0.7mm from the probe, and the medium is FR4. The fourth layer of the structure is the ground of the DUT, and it is connected to the third layer by the via.
It is supposed that substrate is FR4 with a thickness of 1.57 mm with approximate dielectric constant equal to 4.4.
The effects of SAR values were also analyzed using three different substrates of the antenna which were FR4, Rogers RO3006 (loss free) and Rogers RO4003 (loss free).
A square patch with length of [L.sub.3] and L-shaped strip are printed on two square FR4 substrates with length of [L.sub.2] (thickness of 0.8 mm and relative permittivity of 4.4).