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A rectangular waveguide measures 3 x 4.5 cm internally and has a 9 GHz signal propagated in it.

Calculate the cut off wavelength, the guide wavelength, phase velocity and the characterestic wave impedance for TE110 mode.

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emphasized textCalculating the free space wavelenth gives

λ=vcf=3×10109×1010=3.33cm

a. The cutoff wavelenth will be

λ0=2am=2×4.51=9cmCalculatingp,forconvenience,gives p = \sqrt {1-(\frac{\lambda}{\lambda _0})^2} = \sqrt {1-(\frac{3.33}{9})^2} = \sqrt {1-0.137}= 0.93Thenthequidewavelengthis \lambda _p = \frac{\lambda}{p} = \frac{3.33}{0.93} = 3.58 cmThegroupandphasevelocitiesaresimplyfoundfromv_g = v_cp = 3 \times10^{8}\times0.93 = 2.79 \times10^8 m/sv_p = \frac{v_c}{p} = \frac{3\times10^8}{0.93} = 3.23 \times 10^8 m/sThecharacteristicwaveimpedanceisZ_o = \frac{x}{p} = \frac{120 \pi}{0.93} = 405 \ \Omega $

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