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Quarter wave stub protectors are also dc coupled devices. There is dc continuity between either ends of the center pin used by quarter wave stubs. However, instead of a broad band voltage sensitive device (gas tube), quarter wave stub protectors are a tuned band pass filter. A grounded quarter wave matching section in the device presents high impedance to the center conductor at the designed operating band and a low impedance to ground for all other frequencies. Since most of lightning’s energy is at dc or frequencies up to 1MHz, these types of protectors would appear to be ideal. However, this is not the case.+ w% b9 l9 H7 F; Z
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