The use of connectors is very common, so everyone knows about connectors. In order to improve your understanding of connectors, this article will introduce the types of D-SUB connectors and antenna port connectors.
1. Introduction of D-SUB connector types
D-SUB connector, because the shape of the interface looks like a capital letter "D", so we commonly call this type of connector D-SUB, which is an interface connector for analog signals or digital interface signals . In our real life, the places where this kind of connector is often used are on the printer line, on the display line and so on.
How many types of D-SUB connectors are produced by the connector manufacturers? The D-SUB connectors produced are classified as: DB wire-bonding type, DBH-end type, DML crimping type, DMS straight-insertion, DMR bend-insertion Plate type, DMRH curved plug-in type, 57S straight plug-in type, 57BR curved plug-in type, DRB bur type, HDC ultra-thin type; there are also DVI series, VGA series, DR series, HDR series, SCSI series, high current series, etc.
These D-SUB connectors are now the most used VGA series and DVI series. Typically, our personal computers are the most used VGA series (DA15 male, female), parallel port (DB25 female) header), COM serial port (DE9 male header), etc. This type of D-SUB connector may be too classified, so now people are habitually using the DB header to call this type of connector.
2. Antenna port connector
Reserving an RF connector for cable connection on the antenna will make the use of the antenna much easier. However, the history of coaxial RF connectors is not very long. The earliest RF connectors appeared in 1930, the coaxial RF connectors in the UHF band. In the 1940s, Americans designed a threaded radio frequency connector for their military equipment below 5GHz. This is our commonly used N-type connector (see the figure below). It has been upgraded to 18GHz, but its working principle and morphological characteristics have basically not changed. In the future, due to factors such as miniaturization, people have designed various types of connectors such as BNC type, SMA type, etc., but the original design idea is always inseparable from it.
But in recent years, things have changed. Some foreign multinational groups have increased investment in the technological innovation of coaxial connectors. For example, RADIALL and HUBER+SUHNER have developed quick-connect forms of SMA and N-type connectors, and QNA and QN-type connectors. Compared with the original SMA and N-type connectors, this new type of connector has the advantages of fast insertion and removal, not easy to loosen in a vibration environment, does not affect the 360° rotation of the cable after insertion, and can achieve dense installation. The traditional coaxial connector has been replaced in some areas.
There are still some problems with the quick-plug self-locking connector used in the field work antenna. Like the previous N-type and SMA-type connectors, this kind of connector itself does not have waterproof function, and there is sand in the unplugged state. dust protection issues. Recently, Tianshiyu Technology, a technology company in Chengdu, has carefully studied this problem and developed a non-contact quick-plug and self-locking RF connector. Different from the open structure of the traditional connector port, the port of this connector is closed, so it has good waterproof and dustproof functions, and no special waterproof measures are required for use in the field, and even wet connection in water is not enough. It can ensure the smooth flow of the signal, which is especially convenient for the antenna working in the field. The picture below is a physical picture of a non-contact quick-plug connector mounted on an omnidirectional antenna port.
Of course, compared with traditional connectors, this non-contact push-in connector has other differences. Because it is non-contact, this non-contact quick-plug connector is not short-circuited by DC, and the working frequency band is not as wide as that of traditional connectors, which can be from DC to more than ten GHz, or even higher, but it can also work in On an octave or even a wider frequency band, this is enough for most current wireless projects.
