An end launch connector is a coax connector that is used to connect a coax cable to a test board. The connector is attached at the end or edge of a PCB sheet. This connector is used to change microwave energy from a coaxial cable to a path on a PCB board. They are available in three main configurations –angled end launch connectors, vertical end launch connectors, and horizontal end launch connectors.
These connectors are usually preferred to regular connectors as their design minimizes reflections as compared to vertical-mount or right-angle mount connectors. These connectors are usually used for high-frequency choices or where high performance is necessary. For most applications less than 6 GHz, fixed commercial connectors, which are completed by soldering to the PCB board, can be used as they are more cost-effective and easily accessible.
You have seen in many applications southwest microwave’s high-performance end launch connectors are used. The connector is designed to provide low VSWR, mode-free wideband response to 110 GHz for single-layer and multi-layer printed circuit boards where the high-frequency signal is on the top layer. In the southwest connector, you will find male and female options along with narrow bodies. Have a unique clamping mechanism that accommodates board thickness up to 7.62 mm. The end launch connector is robust, reusable, and repairable. Multiple launch formations deliver the best possible match to circuit design.
Further, any discussion of termination requires that you first select the cable and connector series. In several, coaxial cable is any cable with a center conductor surrounded by an insulator, which is covered by a conductive shield and, usually, an outer jacket. The shield layer may be solid or braided or in combination with one or more layers. The term coaxial derives from the internal conductor and the outer shield having a shared central axis. Coaxial cable differs from other shielded cables as the dimensions for all layers/components are carefully controlled to provide constant spacing so that it can function as a transmission line.
Coaxial cable may be allocated into two categories – flexible and rigid. Flexible cables include the basic single-line coax, plus others including biaxial (the old two-line TV cable), twinaxial (twisted pair within a cylindrical shield), triaxial (two coax lines with shields plus a common outer protection), and semi-flexible (also called conformable or hand-formable cable, where the outer shield is plaited, filled with solder, and can be hand-shaped for a restricted number of curves), and semi-rigid.
Most flexible coaxial cable termination use PTFE insulation, solid or wrapped in continuous overlapping layers using porous film. In semi-rigid, the outer conductor is extruded metal, usually copper or copper-plated aluminum, which requires precision-length cuts and forms. PTFE is known for its thermal extension, which can be a problem when connector termination includes soldering. Insulator movement at mating interfaces and at cable-termination areas changes dielectric properties and resultant performance. As a result, semi-rigid cables are often thermal-cycled, typically three to five times, before being trimmed to length, so that the expanding Teflon will instinctively adhere to the ID of the outer conductor, which bounds further measure.
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