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Almost all devices claiming FE related to electricity have common elements like: high voltage, high frequency, negative resistance which will drive a great disturbance in one field with more positive bias against second field with less positive bias (negative if you prefer) which we don’t disturb. Harvesting point is the place where less positive field will meet the effects of the disturbed positive field.
So, proper design of device MUST include all elements in the right order and needs to be calculated according to desired load parameters and characteristics. So, bear in mind that what you create will be matched by nature/environment/aether whatever name, by its property to keep everything perfectly balanced.
So, amplification needs to have an element of negative resistance on top of high frequency and high voltage for efficiency reason.
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