Introduction to the main specifications, electrical properties, and mechanical properties of UHF RF Connectors
The naming of UHF RF Connectors consists of two parts: the nominal designator and the structural designator, separated by a short horizontal line "-". The primary designator of RF Connectors adopts the international common primary designator, and the naming of different structural forms of specific products is specified by the detailed specification, and the structural form represents the structure of RF Connectors.
The main specifications of UHF RF Connectors
Impedance: Almost all RF connectors and cables are standardized to have an impedance of 50Ω. The only exception is generally the 75Ω system typically used for cable TV installations. It is also important that RF coaxial cable connectors have a characteristic impedance that matches that of the cable. If this is not the case, a discontinuity is introduced and loss may result.
VSWR (Voltage Standing Wave Ratio): Ideally it should be unity, good design and implementation can keep VSWR below 1.2 in the range of interest.
Frequency Range: Most RF operations are now in the 1 to 10 GHz range, so connectors must have low losses in this region. For cases above 10 GHz - and there is a lot of work now in the 10 to 40 GHz range of things - there are newer connectors of which to choose. They are expensive as is the cable itself.
Insertion loss: This is the connector loss in the frequency range of interest. Losses are typically in the range of 0.1 and 0.3 dB. Determining how critical per watt (or fractional 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 ratio are low.
Operational cycles: How many connect/disconnect cycles can a connection endure and still meet its specifications? This is typically in the range of 500 or 1000 cycles. The tightening torque specified by the supplier of the threaded connector is an important factor in maintaining performance and reliability.
Power: Power handling is determined by two resistive losses (heating) and insulation breakdown. While even decades of design were dominated by pre-processing tens of watts, today's design community focuses on low power devices such as cell phones, femtocell and femtocell base stations, video interfaces, RF and gadgets. These are in the sub-1W range, so connectors can be much smaller and their power ratings are much less constrained.
Electrical Performance of UHF RF Connectors
The actual electrical performance depends on the performance of the cable, the contact of the cable, the geometry of the connector, the contact of the inner conductor, etc. The maximum frequency of a coaxial cable must be the maximum frequency used by the weakest component in the transmission line, because it depends on all components and not on one component. For example, if the frequency of an RF connector is 10 GHZ, the frequency of the cable connected to it is 5 GHZ, and the maximum frequency of this component is 5 GHZ, the combination of all factors determines the frequency of the entire transmission line.
Mechanical properties of UHF RF Connectors
The processing method of various components in the manufacturing process determines the mechanical and electrical properties of the RF Connectors. The mechanical properties are considered along with the quantity and scale of production. It is important to study the reasons why specific properties are not meeting the requirements and this analysis helps to avoid the next mistake.
On the other hand, the smaller the RF connector, the more difficult it is to manufacture, the higher the manufacturing cost, the worse the accuracy and error. The future of industrial applications, small, excellent, inexpensive electronic components will continue to grow in demand.
The trend of UHF RF Connectors
4、Low standing wave, low loss
5、High capacity, high power
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