RF & Microwave Terms Glossary

Amplitude Tracking is the relative difference in the amplitude response between between any 2 ports of the device.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, Beamforming Networks, Power Dividers, RF Active Components

Azimuth is an angular measurement in a spherical coordinate system.  Azimuth is usually measured in degrees (°).  It can be defined as a horizontal angle measured clockwise from a north base line or meridian.  Azimuth has also been more generally defined as a horizontal angle measured clockwise from any fixed reference plane or easily established base direction line.
Related to: Monopulse Comparators

Directivity, in the case of directional couplers, is a measure of the difference in dB of the power output at a coupled port, when power is transmitted in the desired direction, to the power output at the same coupled port when the same amount of power is transmitted in the opposite direction.  As for antennas, directivity is defined as the power density of the antenna in its direction of maximum radiation in three-dimensional space divided by its average power density. The directivity of the hypothetical isotropic radiator is 1 or 0 dB.
Related to: Directional Couplers, Antennas

Elevation is an angular measurement in a spherical coordinate system.  Elevation is the angle between the horizontal plane and the line of sight, measured in the vertical plane. The reference direction (i.e. an elevation angle of zero degrees) is a horizontal line in the direction to the horizon, starting from the antenna.  Sometimes referred to as the vertical angle or altitude angle.
Related to: Monopulse Comparators

Frequency Min/Max is the minimum and maximum frequency a device operates on.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, 5G Antenna Systems, Beamforming Networks, Directional Couplers, Direction Finding Antennas, Monopulse Comparators, Omni DAS Antennas, Power Dividers, RF Active Components

Insertion Loss is the loss of signal power resulting from the insertion of a device in a transmission line typically expressed in decibels.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, Directional Couplers, Power Dividers

Isolation is a measure of the amount of power that leaks from one port of the device to another. The higher the isolation between the ports, the lower is the leakage between them.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, Power Dividers

Phase Tracking is the relative difference in the phase response between between any 2 ports of the device.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, Beamforming Networks, Power Dividers, RF Active Components

VSWR (Voltage Standing Wave Ratio) is a measure of how efficiently radio-frequency power is transmitted from a power source, through a transmission line, into a load.  In radio engineering and telecommunications, it is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide.  Mismatched impedances cause some of the power to be reflected back toward the source (like an echo). Reflections cause destructive interference, leading to peaks and valleys in the voltage at various times and distances along the line.
Related to: 180 Degree Hybrid Couplers, 90 Degree Hybrid Couplers, 5G Antenna Systems, Directional Couplers, Direction Finding Antennas, Monopulse Comparators, Omni DAS Antennas, Power Dividers, RF Active Components