What type antennas are used for the transmission and reception of microwave signals?

• A. Dipole
• B. Horn type
• C. Loop
• D. Yagi

Answer: (B)

Antennas used for transmitting and receiving microwave signals are designed to be highly directive, efficient, and easy to integrate with guided-wave systems. A horn antenna fits this need perfectly because it acts as a smooth transition from the waveguide that carries the signal to free space. By flaring the waveguide into an aperture, it converts the confined energy into a well-collimated beam with controllable gain and beamwidth. This results in low loss, broad bandwidth, and good impedance matching, which are all important for reliable microwave transmission and reception. Horns are simple to fabricate at microwave scales and can serve directly as feeds for larger high-gain setups, like parabolic dishes or antenna test ranges.

Dipoles, loops, and Yagi antennas don’t align as well with these microwave requirements. A dipole becomes physically impractical at short wavelengths and isn’t as efficient in a guided-wave system. Loop antennas tend to have lower gain and broader patterns not ideal for focused microwave links. Yagi antennas can offer directionality but require multiple elements and are less convenient as a clean, wide-band feed for waveguide systems. Horns provide the best combination of directivity, bandwidth, and ease of integration for transmitting and receiving microwave signals.