Antenna Performance Characteristics

Frequency

The frequency band within which the antenna performs at the stated specifications

Gain (dBi)

The relative amplification of the antenna with respect to an equivalent isotropic antenna, expressed on the decibel logarithmic scale.

Cable loss (dB)

The signal strength loss introduced by the cable connected to the antenna expressed on the decibel logarithmic scale.

Net gain (dBi)

The resulting amplification of the antenna paired with its cable.

Polarization

The orientation of the electrical field which the antenna is optimized to receive. If the transmitting and receiving antennas are both linear polarized, then turning one 90° so that they are cross polarized will reduce the range significantly.

VSWR

Voltage Standing Wave Ratio (VSWR) is the ratio of maximum voltage to minimum voltage along the line. Expresses the degree of match between the transmission line and the terminating element (antenna). When VSWR is 1:1 the match is perfect, a VSWR of 1.5:1 corresponds to 96% power efficiency.

Azimuth 3dB Beamwidth

Width of the antenna beam on the horizontal plane expressed in degrees.

Elevation 3dB Beamwidth

Height of the antenna beam on the vertical plane expressed in degrees.