When choosing RF connectors to pay attention to how the specifications?

I. When choosing RF connectors to pay attention to how the specifications?1. Standard impedance: basically all RF couplers and cables are standardized to 502 impedance, while 752 impedance systems are usually used for cable installations.RF coaxial cable couplers must have the characteristic impedance of the matching cable, otherwise it will lead to the introduction of loss.2. Voltage Standing Wave Ratio (VSWR): Ideally, qualified VSWR: Ideally, a qualified design will be able to keep the VSWR below 1.2 in the range. 3. Coupler Bandwidth: Most RF operating bandwidths nowadays are in the range of 1 to 10GHz, so the coupler is required to ensure that it operates in this region with low losses. For cases above 10GHz, there are now newer couplers available for frequencies up to the 10 to 40GHz range, but are very expensive because of the cable itself.4. Insertion Loss: This is the coupler loss in the frequency range of interest. Losses are typically in the range of 0.1 and 0.3 dB. Determining how critical each watt (or fraction of a watt) is in most designs, even such small losses must be minimized and factored into the link loss budget. It is especially important in low-noise front ends when signal strength and signal-to-noise ratios are low.5. Physical life: RF couplers can usually be coupled/disconnected for 500 or 1,000 cycles, while threaded couplers require attention to the supplier-specified tightening torque, which is an important factor in assuring reliability.6. Load-bearing power: It is determined by two resistive losses (heating) and insulation breakdown. Some of the high-power connectors need to carry tens of watts or more, but there is also today's part of the design community focused on low-power devices, such as cell phones, cellular networks, micro-cellular base stations, video interfaces, etc., which are in the range of 1w or so, so the coupler can be much smaller and the power rating can be much smaller.

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