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• Theoretical Information
• Design and Analysis

In the information part, the rectangular waveguides are explained in detail. TM and TE modes are investigated separately (but in parallel) and the formulas for cut-off wave-number (k_c), propagation constant (b ), cut-off wavelength (l _c), guide wavelength (l _g), phase velocity (u_p), attenuation constant due to dielectric loss (a _d) and wave impedance (Z) are derived for both modes. So, given the dimensions of the rectangular waveguide (a,b), the properties of the filling material (m ,e ), the operating frequency (f) and the mode of the rectangular waveguide (TM_mn or TE_mn), we can calculate any of the outputs mentioned above.

In the design and analysis part, the program calculates all the outputs given the inputs. The user enters the dimensions of the rectangular waveguide (a,b), the properties of the filling material (m ,e ), the operating frequency (f) and the mode of the rectangular waveguide (TM_mn or TE_mn) and the program calculates the cut-off wave-number (k_c), the propagation constant (b ), the cut-off wavelength (l _c), the guide wavelength (l _g), the phase velocity (u_p), the attenuation constant due to dielectric loss (a _d) and the wave impedance (Z). one can also see the graph of cut-off frequency versus the dimensions of the waveguide.

Furthermore, the user can design a rectangular waveguide using the program. If the user enters the properties of the medium and the frequency, with which he/she wants his/her rectangular waveguide to travel, the program designs a rectangular waveguide with the dimensions so that the given frequency is inserted in the middle of TE₁₀ and TE₂₀ modes. For the design, we always take a as being equal to 2b. in this case, the lowest two cut-off frequencies are for TE₁₀ and TE₂₀ modes. From the formulas of the information part, we get

and

Using a=2b and f={(f_C-TE)₁₀+(f_C-TE)₂₀} / 2; the program calculates a and b. In other words, it designs a rectangular waveguide for the given material properties and operating with the given frequency.

If you encounter any problems, you can send us e-mail:
Mustafa Demirhan
Sinan Gezici