Abstract
A precision 30 MHz TE11 mode waveguide below cut-off piston attenuator has been designed for 0–100 dB attenuation range to serve as transfer standard of attenuation. The attenuator has been fabricated using a precision cylindrical copper waveguide and resonant inductive antennas with type-N connector at its input and output ports. The 30 MHz matched antennas have been incorporated in the cylindrical waveguide in such a manner that one serves as fixed transmitter and the other as moveable receiver for changing the attenuation. A Faraday screen type mode filter has also been fabricated to attenuate the amplitude of unwanted TM01 mode to an attenuation level of 60 dB. The piston attenuator has approximately 20 dB insertion loss and has been calibrated in steps of 10 dB over the 0–60 dB range. The results were found to lie within ±0.01 dB/10 dB.
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