Circular is not a type of satellite orbit. The three main types of satellite orbits are Geostationary, Polar, and Elliptical.

Geostationary satellites are placed in an orbit that keeps them fixed above a particular point on the Earth's surface, making them ideal for providing global coverage for communications and other applications.

Medical imaging is not an application of satellite technology. The other options are all common applications of satellite technology.

Downlink is the term for the process of sending signals from a satellite to a ground station.

Uplink is the term for the process of sending signals from a ground station to a satellite.

Packet Satellite Service (PSS) is not a type of satellite communication system. The other options are all common types of satellite communication systems.

Footprint is the term for the area on the Earth's surface that is covered by a satellite's signal.

Handoff is the term for the process of transferring a call from one satellite to another.

L-band transponder is not a type of satellite transponder. The other options are all common types of satellite transponders.

Satellite communications use a variety of frequency ranges, including C-band, Ku-band, and Ka-band.

Yagi antenna is not a type of satellite antenna. The other options are all common types of satellite antennas.

Transponder is the device used to amplify and transmit satellite signals.

Internet access is not a type of satellite communication service. The other options are all common types of satellite communication services.

Digitization is the process of converting analog signals into digital signals for transmission over a satellite link.

Ring network is not a type of satellite communication network. The other options are all common types of satellite communication networks.