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Technical advancements within the telecommunications industry as well as aerospace, defense and medical markets are driving manufacturers and carriers of wireless devices to push performance into the higher frequency bands. XMA Corp. has introduced a new 1.85 mm product family that includes coaxial attenuators, terminations and adapters, expanding its product offerings to meet the challenges of the 65 GHz millimeter wave market.

All three product types operate from DC to 65 GHz. They are Defense Federal Acquisition Regulation (DFAR) compliant and feature unique identification grooves located on the housing and coupling nut to visually differentiate them from similar looking lower frequency products. The materials and finishes used on all of XMA’s 1.85 mm product lines are very durable and suitable for military/aerospace grade applications.


Figure 1

Figure 1 Measured performance for 10 dB attenuators: Top shows SWR at input (red) and output (blue). Bottom shows |S21|.

XMA 1.85 mm, DC to 65 GHz, 1 W, 50 ohm attenuators are available in six different attenuation values: 3, 6, 10, 15, 20 and 30 dB and offer attenuation accuracy as low as ±0.75 dB from DC to 26.5 GHz. These models feature an air compensated, PTFE (Teflon®) dielectric support bead, passivated stainless steel housings and coupling nuts, and gold plated beryllium copper center conductors. Figure 1 shows the typical S-parameter data for the 10 dB units.


XMA 1.85 mm, DC to 65 GHz, 1 W, 50 ohm male terminations weigh 4.6 grams and operate from -55° to +100°C. VSWR performance is rated at 1.20:1 from DC to 18 GHz, 1.30:1 from 18 to 40 GHz and 1.35:1 from 40 to 65 GHz. These products feature a passivated stainless steel housing and coupling nut, a gold plated beryllium copper center conductor and a PTFE (Teflon®) dielectric. Figure 2shows the typical S-parameter data for these units.


XMA 1.85 mm, DC to 67 GHz, In-series adapters are offered in three standard configurations: female-to-female, male-to-male and male-to-female. They offer <1.35:1 VSWR from DC to 67 GHz, have an operational temperature range of -55° to +100°C and can handle a maximum average power of 20 W at 25°C. RF leakage is specified at > 90 dBc. A feature of the 1.85 mm adapter family is that they are all phased matched to within ±10° of each other. These models have gold plated stainless steel housings and coupling nuts, gold plated beryllium copper center conductors and PTFE (Teflon®) dielectrics.

XMA’s line of rugged, high quality, 1.85 mm precision adapters, attenuators and terminations are designed to exceed the ever increasing demands of the 65 GHz market and provide “off-the-shelf” solutions for high frequency, millimeter wave applications.

Figure 2

Figure 2 Measured SWR for DC to 65 GHz terminations.

XMA Corp.

XMA Corp. was established in 2003 through the acquisition of the Omni Spectra® product line from M/A-COM Inc. The 30 plus year legacy of Omni Spectra is well known in the RF and microwave industry and has been recognized as a “Gold Standard” when it comes to quality, performance and value.

XMA Corp.
Manchester, N.H.