Mobile Computing (Lecture 2)

an electrical conductor or system of conductors; converts the required information signal into electromagnetic waves

• Antenna
• Reception
• Transmission
• Beam width

radiates electromagnetic energy into space

• Antenna
• Reception
• Transmission
• Beam width

collects electromagnetic energy from space

• Antenna
• Reception
• Transmission
• Beam width

measure of directivity of antennae

• Antenna
• Reception
• Transmission
• Beam width

a graphical representation of the radiation properties of an antenna as a function of space

• Radiation pattern
• isotropic antenna
• Dipoles
• Parabolic Reflective Antenna

coordinates.

• Radiation pattern
• isotropic antenna
• Dipoles
• Parabolic Reflective Antenna

a point in space that radiates power in all directions equally

• Radiation pattern
• isotropic antenna
• Dipoles
• Parabolic Reflective Antenna

consists of two straight collinear conductors of equal length, separated by a small gap; has a uniform or omnidirectional radiation pattern in one dimension and a figure eight pattern in the other two dimensions

• half-wave dipole
• isotropic antenna
• Dipoles
• Parabolic Reflective Antenna

the type commonly used for automobile radios and portable radios

• half-wave dipole
• isotropic antenna
• quarter-wave vertical antenna
• Parabolic Reflective Antenna

is used in terrestrial microwave and satellite applications

• half-wave dipole
• isotropic antenna
• quarter-wave vertical antenna
• Parabolic Reflective Antenna