Low-Loss Cables Connect to 40 GHz

Low-Loss Cables Connect to 40 GHz

These rugged cables stand the test of multiple mating cycles in measurement systems requiring high durability with extremely low insertion and return losses through 40 GHz.

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Coaxial cables are those often-overlooked components in a high-frequency systems, usually only noticed when they fail due to overworked or over-torqued connectors or over-flexed conductors. One line of coaxial cables built to last is the KBL series from Mini-Circuits, with high-quality plated conductors, rugged armor jacket, and durable 2.92-mm connectors. The combination of low-loss cables and connectors results in a line of fixed-length cables with instrument-grade performance from dc to 40 GHz.

The KBL coaxial cable assemblies (see figure) are available in stock lengths of 1.5, 2, and 4 ft., as well as 1- and 2-m and custom lengths. The RoHS-compliant cables use a solid silver-plated, copper-clad-steel center conductor and round silver-plated, copper outer conductor. The cables achieve excellent insulation between the conductors with polytetrafluoroethylene (PTFE) dielectric, and are fortified by means of stainless-steel spiral armor with a stainless-steel braid. The cables feature a protective shield and strain relief for long life and are terminated at both ends with stainless-steel 2.92-mm connectors. A blue PVC outer jacket protects the cables.

The KBL series of fixed-length coaxial cable assemblies, featuring rugged armor construction and stainless-steel 2.92-mm connectors, can handle dc to 40 GHz.

The connectors are designed to handle a large number of mating cycles with minimal performance degradation, and mate with K, 3.5-mm, and SMA connectors. The design and assembly of the coaxial cable assemblies results in reliable long-term performance, especially in test-and-measurement applications where connectors are attached and removed repeatedly to a test port or a device under test (DUT).

The cable assemblies exhibit low insertion loss and return loss (VSWR), with loss increasing as a function of increasing frequency. For example, for the shortest cable assembly, the 1.5-ft.-long KBL-1.5FT-LOW+, insertion loss is typically 0.49 dB from dc to 6 GHz, 0.85 dB from 6 to 18 GHz, 1.10 dB from 18 to 26.5 GHz, and 1.41 dB from 26.5 to 40 GHz. Return loss is typically 25 dB from dc to 6 GHz, 20 dB from 6 to 18 GHz, 18 dB from 18 to 26.5 GHz, and 17 dB from 26.5 to 40 GHz.

For the somewhat longer 1-m (about 3.28 ft.) KBL-1M-LOW+ cable assembly, insertion loss is typically 1.06 dB from dc to 6 GHz, 1.87 dB from 6 to 18 GHz, 2.35 dB from 18 to 26.5 GHz, and 3.05 dB from 26.5 to 40 GHz. Return loss is typically 25 dB from dc to 6 GHz, 20 dB from 6 to 18 GHz, 19 dB from 18 to 26.5 GHz, and 17 dB from 26.5 to 40 GHz. The table provides a quick comparison of loss performance for the cables from dc to 40 GHz.

The KBL coaxial cable assembles are designed for operating temperatures from ‒55 to +85ºC. All of the cables are rated for power-handling capabilities of 53 W at 2 GHz, 17 W at 18 GHz, 15 W at 26.5 GHz, and 11 W at 40 GHz. With their rugged armored construction, low-loss plated conductor materials, and stainless-steel connectors, these are coaxial cable assemblies that won’t be overlooked, especially because of their ability to deliver reliable electrical connections when needed through 40 GHz.

Mini-Circuits, P. O. Box 350166, Brooklyn, NY 11235-003; (718) 934-4500, FAX: (718) 332-4661.

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