Antennas are structures or devices used to collect or radiate electromagnetic waves

Telescopes are lens assemblies designed to magnify and view distant objects.

Towers, poles and support structures elevate, support and/or position personnel and equipment such as antennas, lighting, surveillance cameras or sensors, wind turbines, weather instruments, and power lines

Parabolic mirrors offer excellent correction of spherical aberration

Parabolic reflectors and ellipsoidal reflectors are used to maximize illumination or projection system output by increasing light source efficiency

Horn antennas are used for the transmission and reception of microwave signals.

Chip antennas are semiconductor ICs used to collect or radiate electromagnetic waves