3/30/2023 0 Comments Coaxial connectorThe following table lists all of the major connector families. Read about Rule of Thumb #117 here, where we calculated the cutoffs for all of the popular precision air coax families. The industry-accepted frequency limits of connectors families are generally 90% of their theoretical cutoff frequency. Don't use coaxial connectors or transmission lines above their cutoff frequencies. The cutoff frequency is a key property of any coax transmission line above which the desired TEM mode will no longer be the only mode that propagates (see transmission lines for a discussion of cutoff frequency, or go straight to the coax calculator. Connector families and their frequency limitations It’s 223 pages in length and includes over 62 connector configurations. To get to specific information on a particular connector type, you need to go to MIL-PRF-39012F Supplement 1 to find the detailed specification sheet for that connector (eg MIL-DTL-83517/1B is the detailed specification page for a flange mounted SMA connector that interfaces to a microstrip line.) But wait, there’s more! MIL-STD-348B has mechanical drawings for each of the different types of connectors that are used in the US military and they are all fully dimensioned with tolerances. If you really want to know the nitty-gritty stuff about common connectors – a great textbook for you is the US specification: MIL-PRF-39012F (coaxial cable connectors) or MIL-DTL-83517B (transmission line device connectors.) It’s about 40 pages long and has generic information on the design requirements for connectors and includes references for the types and quality of materials to be used and the performance tests that have to be met and the test equipment configurations to do the tests. There are US standards and European standards, commercial standards and military standards, and broadcast standards and proprietary standards. We don’t think much about it but it’s kind of amazing that you can buy these inexpensive and precise little microwave parts, one device at one place and another device at another place, and they actually fit together and perform well. If you took apart the swept elbow connector you would find that the dielectric inside is continuous between the two ends. It's because the dielectric typically is not continuous at the 90 degree junction, so there is some parasitic inductance there that screws up the VSWR. If you took apart a 90 degree elbow you'd see why. In general, the swept connectors are better at high frequencies, and the outer jackets are molded rather than machined. Right-angle connectors come in two types: 90 degree, and swept (see photo below). The term "elbow" is another bit of connector slang, it means a right-angle bend connector or adapter. See the equation for the characteristic impedance of coax at coaxial transmission lines, or go straight to the coax calculator. Don't mix these up!) All connector families described on this page are 50 ohms unless otherwise noted. Most microwave systems use a 50 ohm characteristic impedance but some use 75 ohms (BEWARE! Some connector families, such as type N, come in both 50 ohms and 75 ohms. Microwave coaxial connectors are used to make low VSWR coaxial connections, and can be used as the terminations ("ends") of coaxial cables, installed into housings, and increasingly onto circuit cards. There are a wide variety of microwave coaxial connector families and more choices are added each year. Microwave coaxial connectors are now a multibillion-dollar-per-year industry. Possible future topics Microwave coaxial connector overview IEEE standard 287 on precision connectors Here is a clickable index to help you navigate through our material on connectors: Click here to learn about the IEEE standard 287 on precision connectors (new for January 2022)Ĭlick here to see our coax cable model (new for November 2020)Ĭlick here to go to our page on scoop-proof connectorsĬlick her to go to our connector color code pageĬlick here to go to our connector sex pageĬlick here to go to our SMA and SSMA connector pageĬlick here to go to our SMC connector pageĬlick here to go to our Precision connector pageĬlick here to go to our How (not) to trash a cal kit pageĬlick here to go to our Connector care page - mandatory reading!Ĭlick here to go to our Connector torque pageĬlick here to go to our Push-on connector pageĬlick here to go to our SMB connector pageĬlick here to go to our SMP connector pageĬlick here to go to our SMPM connector pageĬhess-set photo courtesy of TVB of !Īttention everyone: we recommend that you use our section on connector care as a mandatory reading assignment before any of your new hires are even allowed in your laboratory! Check out our connector care poster in our download area!
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |