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Anritsu has introduced the Vectorstar premium series of microwave vector network analyzers (VNAs).

The MS4640A delivers frequency coverage of 70 kHz to 70 GHz and dynamic range of 103 dB at 67 GHz.

The Vectorstar MS4640A offers standard frequency ranges that go to 20 GHz, 40 GHz and 70 GHz.

This two-port engine is compatible with existing four-port and broadband mmW systems for 70 kHz to 110 GHz measurements, or waveguide banded measurements up to 500 GHz.

For true broadband applications such as device modelling, the 70 kHz low-end provides seven octaves of additional information below the traditional 10 MHz cut-off of conventional microwave VNAs.

This improves the error-prone task of DC-approximation, providing better device models and circuit simulation.

The result is designs that work as predicted the first time, eliminating long and costly fabrication cycles.

The low-end frequency also improves stability as it eliminates coupler roll-off below 1 GHz.

Vectorstar’s 100 dB dynamic range at 70 GHz offers excellent accuracy.

Supplementing the wide dynamic range is the MS4640A’s excellent receiver compression level.

The VNA’s receiver has a +10 dBm 0.1 dB compression level at 70 GHz.

The Precision AutoCal for 70 kHz to 40 GHz or 70 GHz calibrations can achieve residual directivity of 42 dB at 70 GHz and up to 50 dB at 20 GHz.

This allows devices to be more tightly specified.

The MS4640A can acquire data for optimum device characterisations over different physical and environmental conditions, drive levels or frequency ranges.

Vectorstar MS4640A features a new VNA platform.

For applications from 70 kHz to 2.5 GHz, it uses a mixer-based receiver with bridges for directional devices.

Above 2.5 GHz, a harmonic-sampling receiver is incorporated, with the traditional couplers for directional devices.

Since the couplers are not taxed by extending to low frequencies, raw directivity is not traded for frequency coverage, resulting in superior stability.

Non-Linear Transmission Line (NLTL) technology, also known as Shockline technology, is used for the receiver, resulting in uncompromising performance to 70 GHz and beyond.

This monolithic sampling technology, along with the use of a higher LO frequency, provides extraordinary conversion flatness, isolation and dynamic range.

The MS4640A is built on a Windows XP Pro OS.

It offers a 26cm touch-screen LCD display with USB 2.0, Ethernet and GPIB connectivity.

The VNA has enough memory and graphics capability to offer 16 independent channels, each with 16 traces, 13 makers per trace and up to 25,000 points per channel.

For applications such as time domain that require as many points as possible, 100,000 points are available when Vectorstar operates in single-channel mode.

The 70 kHz to 70 GHz Precision AutoCal is designed with advanced software algorithms and new switching hardware.

It references an LRL calibration up to 70 GHz.

Anritsu’s 70 GHz switching technology provides the lowest parasitics to produce the lowest losses and best matches to create the most accurate corrected residuals.

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