Simple Mechanical Phase Adjustment
These SMA connectors for semi-rigid coaxial cables offer a precise, yet extraordinarily simple means of phase adjustment for microwave instrumentation. Coaxicom phase adjustable connectors incorporate a threaded interconnection of variable length. Turning a phase adjustment nut creates small-incremental changes in cable length and hence phase, up to a maximum of 180 degrees at 18 GHz.
MDC 1089-2 & -3 Phase Adjuster Connector
Coaxicom phase adjustable connectors are available in two standard sizes, MDC 1089-2 for .141″ diameter cable and MDC 1089-3 for .085″ diameter cables. Adapter versions, MDC 189-1 (DC-18GHz) and MDC1089A (DC-4GHz) are also available for in-line applications. For phased array radar, test equipment, ILS & other instrumentation using phase matching techniques, the new connectors substitute the ease of mechanical screw adjustments for laborious cable-trimming. Phase matching may be performed at final production stages, allowing less stringent specifications for equipment components. Once established the proper phase setting for each cable is maintained by a connector locking nut. To compensate for system aging, the locking nut may be released and new phase adjustments made at any time.
MDC 1089A Adapter Alternative
Phase Adjuster VSWR Data Chart
Unlike other phase-matching techniques with limited frequency ranges which may hamper performance or require use of more than one model, each broadband Coaxicom phase adjustable connector covers the entire range from DC to 18 GHz. Low VSWR is typical (see chart above). Phase adjustment range in degrees is ten times the frequency in GHz (e.g. 100 degrees at 10 GHz, 180 degrees at 18 GHz).
Coaxicom phase adjustable SMA connectors are operational at temperatures from -65 detgrees C to +125 degrees C. They also meet the following sections of MIL-Std-202 for environmental conditions. Vibration: Method 204- Test Condition D.
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Inter and intra series coaxial adapters and wave guide-to-coaxial adapters are some of the more common components used in RF, microwave and wireless applications. OEM’s and manufacuturing and engineering test facilities are continually required to provide temporary or permanent connections between the many coaxial and waveguide series in use. This is particularly true today where long established connector series (N, TNC, BNC, 8874, 900, SMA,e tc.,) must be mated with interfaces introduced later (3.5mm, 7/16 DIN, SSMB, SSMC, MCX, 7mm, etc.).
Recognizing this need, Coaxial Components Corp maintains a large inventory of MIDISCO and Microwave Distributors components. Some of the most common and some not so common inter and intra series coaxial and coaxial-to-wave guide adapters are available. We can also supply wave guide transitions in standard and double ridge configurations. If you have a requirement not shown in the catalog or our cross referencing tool, simply request engineering assistance through our website or call 772-287-5000.
The user should bear in mind that for best performance, the usable frequency for a given adapter is established by the operating range of the lower frequency interface on the adapter. As a guideline, a table is provided below to summarize the recommended frequency range of the more common coaxial interfaces. These guidelines represent the range for optimum performance. Most adapters are usable at higher frequencies with limitations.
Coaxicom manufactures standard and precision adapters. Standard adapters are usable to frequencies less than 12 GHz for N and TNC, or up to the recommended frequency range for the other series. Precision adapters use an “X” prefix for the part number and feature stainless steel construction for a more precise interface and an extended frequency range for the N and TNC series. In the case of precision N, TNC or SMAs interfaced with lower frequency series (ie: XBM-SM, XNF-BM etc.), the precise construction and stepped internal transition yields improved performance beyond the normal operating range of the lower frequency series.