RF coaxial connectors for RF coaxial feeder system connections

RF coaxial connectors for RF coaxial feeder system connectors commonly known as RF coaxial connectors. RF coaxial connectors according to the connection method is categorized as: threaded connectors, bayonet connectors, push-in connectors, push-locking connectors. Commonly used RF coaxial connectors are SMA-type, SMB-type, SSMB-type, N-type, BNC-type, TNC-type and so on. RF coaxial connector electrical performance aspects including characteristic impedance, voltage withstand, high operating frequency and other factors, characteristic impedance is the connector with the transmission system and cable impedance matching, is the main indicator of the choice of RF coaxial connectors, impedance mismatch will lead to a significant decline in system performance. Through the calculated impedance to select the matching connector, convenient procurement, inspection and design. The method of calculating the impedance value of RF coaxial connectors using their structural dimensions is fast and easy. Calculation of RF coaxial connector characteristic impedance The characteristic impedance of RF coaxial connector is mainly based on the inner diameter of the outer conductor and the outer diameter of the inner conductor, as well as and filled with the media jointly decided. As shown in Figure 1 3.3 Example 2 BNC type connector characteristic impedance: BNC type connector used in low-power, according to the characteristic impedance is divided into 50Ω and 75Ω two kinds. Different from other types of connectors is characterized by 50Ω and 75Ω of the inner conductor and outer conductor of the same size, constituting the characteristic impedance of different differences in the composition of whether the filling medium, that is to say, there is a kind of impedance of the connector is filled with air. 75Ω characteristic impedance connector does not have the filling medium, that is, the air medium (εr = 1). 50Ω characteristic impedance of the inner and outer conductor filled with the common between the conductor PTFE medium, εr about 2.2-2.4 between the nominal value of the inner diameter of the outer conductor of the BNC-type connector is 6.5 mm, the outer diameter of the inner conductor is 2.06-2.21 mm. the same for the nominal value of the inner diameter of the outer conductor due to the machining process caused by the error range of ± 0.05 mm, so that you can figure out the conditions of the BNC-type radio-frequency coaxial connector with or without the media. connector with or without dielectric conditions. The following is the characteristic impedance when there is a filling medium. 75Ω (filling medium for air, εr = 1): the inner conductor diameter of 2.06mm, the outer conductor diameter of 6.45 is 68.4 impedance; when the two are 2.21mm and 6.55mm respectively, the results of 65.1 50Ω (filling medium for air, εr = 2.2): the outer diameter of the inner conductor for the 2.06mm, the outer conductor diameter is 6.45 is 46.2; when the two are 2.21mm and 6.55mm respectively, the results of 65.1 50Ω (filling medium for air, εr = 2.2): the inner conductor diameter of 2.06mm, the outer conductor diameter is 6.45 is the impedance of 46.2; when the two are 2.21mm and 6.55mm respectively, the result is 43.9 Let's calculate an example: 3.4 Calculation Notes 3.4.1 Inner conductor diameter RF coaxial connector of the outer diameter of the inner conductor does not refer to the diameter of the upper end of the center pin (thinner), but the lower end of the thicker part of the diameter. This part of the diameter and the jack part of the same diameter, measuring one of the two can be used in the calculation should be used in this part of the size. 3.4.2 Outer conductor diameter Some connector manufacturers do not give the inner diameter of the outer conductor, given the outer diameter of the outer conductor is prone to error, so in the calculation of impedance can not be used, you can use vernier calipers for measurement. Listed below are some of the current types of RF coaxial connectors of the outer conductor of the inner diameter of the outer conductor, only for you to come to the reference. N threaded 7mm; BNC bayonet 6.5mm; TNC threaded 6.5mm; SMA threaded 4.13mm; SMB plug-in 3mm Refer to standard (IEC169).

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