![]() ![]() This connector, which was also developed by HP, can achieve performance to 110 GHz. 1.85-mm connectors can be mated with 2.4-mm connectors, but not with SMA, 3.5-mm, and 2.92-mm connectors.įurthermore, millimeter-wave applications can take advantage of the 1.0-mm connector. The company then offered its design as public domain in 1988 for the purpose of standardizing connector types. HP developed the connector in the mid-1980s. In addition, the 1.85-mm connector can achieve mode-free performance to 65 GHz. Therefore, an appropriate adapter is needed to connect a 2.4-mm connector to either an SMA, 3.5-mm, or 2.92-mm connector. However, should one attempt to connect a 2.4-mm connector to an SMA connector, the difference will be very clear-the two connector types will not mate. At first glance, it may be difficult to distinguish a 2.4-mm connector from a 2.92-mm connector. 2.4-mm connectors have a thick outer wall, thus making them less frail than SMA and 2.92-mm connectors. The 2.4-mm connector, which was developed in the mid-1980s, can achieve performance to 50 GHz. The BNC connector is often found in test instruments. They also derive their names from the inside diameter of their respective outer conductors.ģ. Like 3.5- and 2.92-mm connectors, 2.4-, 1.85- and 1.0-mm connectors employ an air dielectric. Higher-Frequency Connectors: 2.4-, 1.85-, and 1.0-mmĮven higher-frequency performance can be achieved by 2.4-, 1.85-, and 1.0-mm connectors. Measurement systems and high-performance components, for example, sometimes implement 2.92-mm connectors. 2.92-mm connectors can be used at higher frequencies than 3.5-mm connectors, as they offer performance to 40 GHz. Introduced by Wiltron (now Anritsu) as the Type-K connector in 1983, the 2.92-mm connector is available today from a wide range of suppliers (Fig. These connectors are known for their durability, as they were designed to allow thousands of repeatable connections. The connector was primarily developed at Hewlett-Packard (HP) and later manufactured by Amphenol. The 3.5-mm connector, which can achieve mode-free performance to 34 GHz, first appeared in the 1970s. 3.5- and 2.92-mm connectors are both named after the inside diameter of their respective outer conductors. Both of these employ an air dielectric and can perform at higher frequencies than their SMA counterpart. The SMA connector is mechanically compatible with two other connector types: 3.5- and 2.92-mm connectors. Although they are common and inexpensive, SMA connectors have their limitations-they are rated for a very limited number of connection cycles. Furthermore, while standard SMA connectors perform from dc to 18 GHz, some suppliers provide versions that can perform to 26.5 GHz. As mentioned in Part 1, SMA connectors employ a solid dielectric. Originally intended to be used with 0.141-in.-diameter semi-rigid coaxial cables, the SMA connector’s usage was later extended to flexible cables as well. Like the Type-N connector, the SMA connector-which has an impedance of 50 Ω-employs threaded coupling. 2.92-mm connectors can be used at frequencies as high as 40 GHz. The connector was then designated the SubMiniature A, or SMA, connector.Ģ. The development of the BRM connector continued, leading to its incorporation into MIL-C-39012 in 1968. It originated in the late 1950s when James Cheal of Bendix Research Laboratories designed the Bendix real miniature (BRM) connector. The SMA connector is widely used throughout the RF/microwave industry (Fig. The SMA Connector and its Mates: 3.5- and 2.92-mm Connectors ![]() The 7/16 DIN connector can cover a frequency range of dc to 7.5 GHz. These connectors are known for their superior return loss and intermodulation distortion (IMD) characteristics. The 7/16 DIN connector derives its name from its dimensions the diameter of its inner conductor contact is 7 mm and the internal diameter of its outer conductor is 16 mm. The SMA connector is one of the most common connector types used for RF/microwave applications. Type-N connectors are covered by the MIL-C-39012 specification.ġ. ![]() Furthermore, both 50- and 75-Ω versions are available. Standard Type-N connectors perform to 11 GHz, while versions that perform to 18 GHz are offered by some connector suppliers. Still commonly used today, this connector, which employs threaded coupling, is known for its durability. Type-N and 7/16 DIN ConnectorsĪs stated in Part 1, the Type-N connector was introduced in 1942. In Part 2, we’ll continue by describing various types of coaxial connectors that are commonly used for RF/microwave applications. Part 1 provided a general overview of connectors, as important parameters and terminology were discussed. This two-part series examines the coaxial connector, which is an often overlooked-but nonetheless vital-aspect of an RF/microwave application. ![]()
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