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Standard air-filled rectangular waveguides of dimensions =2.29 cm and b=1.02 cm are designed for radar applications. It is desired that these waveguides operate only in the dominant TE$_{10}$ mode with the operating frequency at least 25% above the cutoff frequency of the TE$_{10}$ mode but not higher than 95% of the next higher cutoff frequency. The range of the allowable operating frequency f is

  1. 8.19 GHz ≤≤ 13.1 GHz
  2. 8.19 GHz ≤ f ≤ 12.45 GHz 
  3. 6.55 GHz ≤ f ≤ 13.1 GHz
  4. 1.64 GHz ≤ f ≤ 10.24 GHz
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