| 摘要 |
A protective device for transmitting electromagnetic signals of a desired freqency band from a source to a load comprises an outer conductor, an inner conductor extending coaxially within the outer conductor (213) and a quarter wavelength stub. A radio frequency impedance control (RFIC) tube is used to maintain the proper transmission line impedance for the device. The stub is connected, at one end, to the inner conductor, extends radially through an opening in the RFIC tube and wraps around the RFIC tube in at least one plane. The other end of the stub is connected to the outer conductor (213) either directly or indirectly by means of distributed capacitance through a dielectric insulator. In use, the inner conductor serves as the transmission line, the outer conductor (213) serves as the return path and the quarter wavelength stub serves as an inductor for filtering out electromagnetic energy which falls outside the desired frequency band.
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