RF Technical Terminology
Corona is defined as the minimum voltage requirement at which the breakdown of air gaps between conductors will not occur. Corona develops primarily in low air pressure situations, such as conditions which would be seen in high altitude aircraft. Corona is important since it will create noise and distort the transmitted signal if it occurs.
Abbreviation for Dielectric Withstanding Voltage. This minimum voltage requirement serves to insure that the connector’s insulating material can withstand momentary high voltages surges without causing dielectric failure.
An RF or microwave signal is an alternating current (AC) wave form, meaning it swings from a positive to negative value. Each positive to negative swing is called a cycle. Frequency is the term which defines the number of cycles occurring per second.
Impedance is expressed in ohms and is determined by the connector geometry and insulating material parameters.
Impedance will vary with frequency. For optimum performance connector impedance must be the same as the system impedance in which the connector will be used.
Insertion Loss is defined as the absorptive signal losses through the connector with respect to frequency. Like VSWR, it is directly related to changes in Impedance,but is also dependent on the properties of the connector’s insulation materials and conductors. Insertion Loss is the other major factor which contributes to the total transmitted signal efficiency of the connector.
RF High Potential
RF High Potential is a minimum voltage requirement for the connector at frequencies greater than 1 MHz.
This requirement insures that the connector will not exhibit excessive leakage current or dielectric failure due to high RF voltages.
RF Leakage is defined as the amount of signal which radiates from the connector with respect to frequency.
Sources for signal leakage can come from slots or holes in a connector body, from poorly mated connectors or through the braid in a coaxial cable.
Abbreviation for Voltage Standing Wave Ratio. VSWR is defined as a ratio of transmitted versus reflected signal through the connector with respect to frequency.VSWR is directly related to changes in Impedance with respect to frequency. It is one of two major factors contributing to the total transmitted signal efficiency of the connector.
Working Voltage is defined as the maximum safe operating voltage of the connector over its rated frequency range and atmospheric conditions. Although other voltage specifications may be at higher levels, they serve as safety factor requirements to insure that the connector will operate properly at or below its rated working voltage.