RF coaxial connector specification size：
(1) SMA connector: RF coaxial connector is one of the most commonly used RF/microwave connectors. SMA connector is filled with PTFE media, small size, daily applicable frequency range is DC ~ 18GHz (also seen to 40G SMA connector), and 3.5mm, 2.92mm connector mechanical compatibility.
(2) 3.5mm connector: 3.5mm connector is an outer conductor body diameter of 3.5mm, characteristic impedance of 50Ω, the connection mechanism is 1/4-36UNS-2 inch thread connector, the working frequency can reach 33GHz, the use of air medium. The outer conductor of the 3.5mm connector is thicker than the SMA connector and the mechanical strength is better than that of the SMA connector. The electrical performance is better than SMA connectors, and the mechanical durability and repeatability are higher than SMA connectors.
(3) 2.92mm connector: 2.92mm connector external conductor inner diameter of 2.92mm, characteristic impedance of 50Ω, inner conductor diameter of 1.27mm, connection mechanism of 1/4-36UNS-2 inch thread of RF coaxial connector, working frequency range DC~46GHz.
(4) 2.4mm connector: the outer conductor body diameter is 2.4mm, the characteristic impedance is 50Ω, the air medium is adopted, and the working frequency can reach 50GHz.
RF connector market development direction：
1. Small size. SSMA type, SSMC type, MMCX type connector and 1.92am, 1.85 mm, 1mm series connectors have emerged successively, meeting the requirements of the development of the whole machine, especially the space electronic system.
2. High frequency, wide transmission bandwidth. The upper limit of the operating frequency of the 2.92mm series connector can reach 46GHz; 2.4 mm series connectors operate up to 50 Gnz in upper operating frequency; 1.85 Bin series connectors operate up to 65GHz in the upper limit; The 1 mm series connectors developed by some developed countries have extended the upper limit of the working frequency of the coaxial system to 110 GHz, which meets the requirements of the development of weapons and equipment to higher frequencies.
3. Multi-function: In addition to playing the role of a bridge, it also has the function of processing signals, such as filtering, phase modulation, frequency mixing, attenuation, detection, amplitude limiting, etc.
4. Low standing wave and loss: to meet the needs of weapon systems and precision measurements.
5. Large capacity and power: large capacity and high power mainly adapt to the development needs of the information superhighway.
6. Surface mounting: mainly adapt to the development needs of SMT technology (surface mount technology), and is conducive to simplifying the wiring structure design of multi-layer printed boards.
The above is about the RF connector classification, specifications, size, model, development direction of the knowledge introduction, in order to adapt to the whole machine equipment miniaturization, modularization, high frequency, high precision, high reliability of the development, RF connector new products are constantly being developed, so that RF connectors continue to miniaturization, high reliability, high frequency, high power, low voltage standing wave ratio direction development.
