Why are waveguides preferred at RADAR microwave frequencies?

Waveguides are preferred at RADAR microwave frequencies primarily due to their lower transmission losses compared to other types of feedlines. At microwave frequencies, traditional coaxial cables and other types of transmission lines tend to experience higher losses due to factors such as dielectric losses, resistance, and signal attenuation over distance.

Waveguides, on the other hand, utilize a hollow metal structure that confines and guides the electromagnetic waves. This design allows for efficient transmission with minimal loss, as the energy propagates through the waveguide with reduced interaction with the conductors. Additionally, waveguides can support higher power levels without the risk of breakdown or increased losses, making them particularly suitable for RADAR applications where performance and reliability are critical.

By minimizing losses, waveguides ensure that more of the transmitted energy reaches the target, which enhances the effectiveness of RADAR systems. This is especially important in applications where signal clarity and strength are required for accurate detection and ranging.

In contrast, while other options touch on aspects of durability, cost, and installation ease, they do not directly address the primary concern of transmission efficiency, which is the key reason for choosing waveguides at microwave frequencies.