A new Within Series model offers application coverage over the frequency range of DC to 67.0 GHz. Model 4030 is a compact, 1.85mm, Within Series adapter with a 50 ohm impedance that enhances the company’s family of superior performance products. This new adapter is a straight-body style constructed with 1.85mm male gender (plug) and female gender (jack) connectors. This 50 ohm adapter is manufactured to precise RF specifications and has a maximum VSWR of 1.25:1 (50 to 67 GHz). Model 4030 offers superior performance ratings, including low insertion loss of DC to 7 GHz: 0.040*√f GHz; 7 to 67 GHz: 0.035*√f GHz; and RF leakage of less than -100 dB. The compact adapter measures just 0.817” in length with a 5/16 hexagonal locking ring. Designed for extensive use in military and aerospace applications, the company’s coaxial adapters are manufactured to MIL-STD-348 test-grade requirements, ensuring stable phase-matched performance. Users will find exceptional operation in critical applications such as in measurement systems with vector network analyzers (VNAs) requiring phase and amplitude stability and repeatability. To provide ruggedness and versatility in the lab, or in the field, the RoHS-compliant adapters are constructed with passivated stainless-steel bodies and gold-plated beryllium-copper (BeCu) contacts to minimize insertion loss and return loss in high-frequency applications.