A large number of product models, welcome to consult.
TYPE NAMING RULES OF RF COAXIAL CONNECTOR
Type Naming
The type name of RF coaxial connector is made of main symbol and structural symbol in themiddle of which is separated with “-“.
Main Symbol
Main symbol of RF coaxial connector use international universal main symbol. Different namingways refer to different structural products and the detail specification.
Structural Symbol
The structural symbol of RF coaxial connector is listed as belew:
Sample for the composition of RF coaxial connector
Example 1: TNC-J3
It means type TNC straight RF plug, pin inner conductor, match SYV-50-3 or RG58/U RF cable,with a nut clamp type in terminative form.
Example 2: MCX-C-JW1.5
It means type MCX right angle plug, pin inner conductor, match SFF-50-1.5-1 or RG 174/u RF cable, with crimp type terminating form.
Example 3: SSMB-TKE-6
It means type SSMB straight PCB mount RF plug, socket inner conductor, 50Ω. “-6” means the order number of product in our company.
Example 4: RPSMA-C-ZJY1.5
It means reverse polarity type SMA RF socket, pin inner conductor, bulkhead mount type, matchSFF-50-1.5-1 or RG 316/u cable, crimp type terminative form.
RF COAXIAL CONNECTOR SELECTION
The factors that consumers to select a connector should take into account include not only theelectronic performance but also economic factors. You should mainly concern about four aspects:Performance must meet the needs of system wiring and economy conform requirement of valueengineering. The following four aspects need to be considered:
Connector interface is often determined by its application. At the same time, it needs to meetelectric and mechanical performance.
BNC connector with bayonet lock, which often used in radio signal connection with frequencyunder 4GHz,is widely used in network system, instrument, meter and internet.
TNC’s interface looks like BNC’s except the screw coupling. It can be used when the frequencyup to 11GHz, and performs well in vibration.
SMA connector is widely used in aviation, radar, microwave communication, digital communication etc. Its characteristic impedance is 50Ω,match flexible cables whose frequency is under12.4GHz and Semi-Rigid cable whose frequency can be up to 18GHz.It owns strong mechanicalperformance and can be used in wide range of frequency for its screw coupling.
The size of SMB is smaller than SMA. It is mainly used in digital communication fields and taking the place of L9.The 50Ω one can be used up to 4GHz and 75Ω one corresponds to 2GHz.Quick connection is the advantage for its snap-on coupling.
SMC is similar to SMB. For its screw coupling mechanism, it owns strong mechanical performance and wider range of frequency. It is mainly used in military or high vibration environment.
Type N is a kind of Low-medium power connector, with screw coupling mechanism The characteristic impedance is 50Ω or 75Ω,and frequency is up to 11GHz. This type is widely used in radioequipment and electronic instrument, especially in testing apparatus.
Type MCX connectors provided by Jingcheng company is widely used in the telecommunication fields in narrow space of the equipment for its small size and reliable connection.
(1)Characteristic Impedance:
The characteristic impedance of connector must match that system and RF coaxial cable. Connector interface must meet the characteristic impedance 50Ω or 75Ω. If not , it will descend thesystem performance.
(2)Voltage
Make sure that working voltage of the connector is under the maximum tolerance voltage.
(3) Maximum working frequency
All kinds of connector have a maximum working frequency. Some 75Ω products designed for commercial usually have a minimum working frequency limit.
TV cable is often used in system only thinking over impedance for its small shield effect.
TV flexible cable is a transmutation of TV cable. It is widely used in computer for its relative continuous impedance, better shield effect, flexible and low price, but could not used in systems that require high shield effect.
Shielded flexible cable dispel inductance and capacitance, mainly used in apparatus and build-ings. Flexible coaxial cable become the most popular airtight transmit cable for its special perfor-mance. Coaxial means both signal and grounded conductor is on the same coaxial. Its outer con-ductor is made of micromesh twist, so is called weaved coaxial cable. The electrical characteristicsof this cable offer excellent attenuation performance which refers to the basketwork materials and itsthickness. We usually use semi-rigid cables at high frequency, whose tubular crust take the place ofouter conductor that improve shield effect.
There are two methods mainly to install connector: A, solder center conductor and screw onshield layer. This method is designed for the situation without special install tools. B crimp centerconductor and crimp shield layer. Such method needs crimping tools. All the other installation methods are derived from these two methods, for example: solder center conductor, crimp shield layer.Because crimp method brings high working efficiency and reliable performance by using the specialcrimp tool, and it is unanimous to guarantee the quality of every connector, this method will becomemore and more popular.
Connector provided by Jingcheng company can be used in radio frequency coaxial cable, printcircuit board, Micro-strip circuit etc. It has been proved certain connector of from and certain the
cable of model is matched each other.Generally speaking, fine cable connects with small-sized connector, and yet thick cable corre-sponding to large size connector. You may see the cable size table attached that introduces how toselect the suitable connector.
Structure of connector affects its price greatly. Different structure requirement meets differentoccasion. Connector used for military choose the excellent materials. Body of shell use brass bar orstainless steel bar, the resilient contact use berylium copper, insulator use Teflon, inner and outerconductor is gold-plated, makes more reliable performance. Its resistance is low and anti-corrosive,and the technical requirement of product is strict, But connector for commercial use low-priced materials.
Body of shell use the brass casts the body, insulator use polyethylene, conduct plated silver ect.Because silver is easy to be oxidized, nickel-plating is more popular. Materials and structure of connector influence working difficulty and efficiency. So users need to select better performance-priceratio according to application.
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