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.
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.
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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