Which antenna is compact and low profile?

Correct Answer: B – Patch antenna
Explanation:
A patch antenna is widely used in modern wireless communication because it is compact, lightweight, and has a low-profile design. Typically fabricated on a flat substrate, it can easily be mounted on surfaces like walls, vehicles, or devices without occupying much space. In contrast, parabolic antennas (A) and horn antennas (D) are bulky and require significant mounting space, while long wire antennas (C) are physically long and less practical for compact applications. Patch antennas are ideal for mobile devices, satellite communications, GPS, and IoT applications where size and form factor are critical.