Factors in RF coaxial connector power capacity

RF coaxial connector connector specifications: for the same signal frequency RF signals, the size of the connector power to withstand large. For example, the connector pinhole specifications relate to the current capacity of the connector, will be directly related to the power. In all types of common RF coaxial connector, 7/16 (DIN), 4.3-10, N-type connector specifications are also larger, the corresponding pinhole specifications are also larger, the general N-type connector power to withstand about 3-4 times the SMA. Plus N header is more commonly used. Operating frequency: RF coaxial connector power to withstand the signal frequency becomes higher and lower, the transmission signal signal frequency changes lead to consumption and voltage VSWR changes, thus affecting the transmission power capacity, and skin effect. For example, the general SMA connector, in the 2GHz power to withstand about 500W, in the 18GHz under the average power to withstand did not get to 100W. frequency higher than 18GHz attenuator, loads and other passive components, the average power to withstand most of the 100W or less. For millimeter wave frequency band, like 1.85mm67GHz fixed attenuator in the average power to withstand 10W or less, 1.85mm67GHz load average power to withstand 22W or less. 2.92mm attenuators and loads can be chosen more, the average power to withstand up to 100W.

Voltage standing wave ratio: RF connectors in the design of a certain electrical length, in the same length of the line, the impedance and load impedance is not equal, from the load side of a portion of the voltage and current, was reflected back to the power side of the wave, called the reflected wave; from the original voltage and current to the load is called the incident wave. The synthesized wave of the incident wave and the reflected wave is called standing wave. The ratio of the maximum and minimum voltage values of a standing wave is called the voltage standing wave ratio (also known as the standing wave coefficient). The reflected wave occupies the channel capacity space, which reduces the transmission power capacity. Access Loss: Insertion Loss (IL) is the power consumption on the line due to the introduction of RF connectors. Considered as the output power to input power ratio. Connector insertion loss increased by many factors, mainly: impedance inconsistency, assembly accuracy deviation, with the end face gap, axis skew, lateral offset, eccentricity, machining accuracy and plating process and so on. Because of the existence of consumption so that the difference between input and output power, will also affect the bearing power. Altitude air pressure: changes in air pressure lead to changes in the dielectric constant of the gas segment, and low-pressure gas is easily ionized to form corona. The higher the altitude, the lower the air pressure, the lower the power capacity. Contact resistance: RF connector contact resistance refers to the connector insertion and closure of the inner and outer conductor contact resistance, generally in the milliohm level, the value should be as small as possible. It is mainly to assess the mechanical properties of the contact parts, the measurement should remove the body resistance.

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