helical resonator filter

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Distributed element filter — Figure 1. A circuit featuring many of the f … Wikipedia
Metamaterial antenna — This Z antenna tested at the National Institute of Standards and Technology is smaller than a standard antenna with comparable properties. Its high efficiency is derived from the Z element inside the square that acts as a metamaterial, greatly… … Wikipedia
Resistor — A typical axial lead resistor Type Passive Working principle Electrical resistance Invented Ge … Wikipedia
Potentiometer — This article is about the electrical component. For the measuring instrument, see Potentiometer (measuring instrument). Potentiometer A typical single turn potentiometer Type Passive Electronic s … Wikipedia

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