🔍 Key Concepts

• X-band frequency range and corresponding wavelength in a standard marine radar set • Relationship between waveguide dimensions and operating wavelength • Why bend radius must be large compared to waveguide size to minimize reflections and power loss

💭 Think About

• First, estimate the approximate wavelength of an X-band radar signal and compare it with each bend-radius option given. • Consider how a very tight bend (small radius) would affect the signal inside a rectangular waveguide—what happens to reflections and standing waves? • Think about typical physical sizes of standard X-band marine radar waveguides and what would be considered a ‘gentle’ vs ‘sharp’ bend for them.

✅ Before You Answer

• Verify the frequency range of X-band radar and convert that to wavelength in centimeters or inches. • Check typical inside dimensions of an X-band rectangular waveguide used on ships and compare those dimensions with each radius option. • Ensure the chosen radius is significantly larger than the broad wall dimension of the waveguide to reduce loss and distortion.