Anritsu VectorStar
Understanding the Anritsu VectorStar
When engineering the absolute cutting edge of the electromagnetic spectrum—such as 6G communication networks, automotive radar, and quantum computing infrastructure—engineers cannot tolerate measurement blind spots. A standard Vector Network Analyzer (VNA) might be completely blind below 10 MHz, or it might max out at 67 GHz. Anritsu VectorStar is the flagship, cost-no-object VNA architecture designed to obliterate those limits, providing the widest single-sweep frequency coverage in the world.
The hallmark of the VectorStar platform is its ability to perform a flawless, continuous, mathematically coherent sweep from an incredibly low 70 kHz all the way to 145 GHz through a single 0.8mm coaxial connector. If the engineer needs to go even higher, they can attach millimeter-wave extender modules to the VectorStar, pushing the machine's measurement capabilities up to a staggering 1.1 Terahertz (THz).
The NLTL Advantage
Traditional VNAs use superheterodyne step-recovery diodes (SRD) as the mixing engine to downconvert high frequencies. At millimeter-wave frequencies, SRDs suffer from massive thermal noise and phase jitter. VectorStar abandons this legacy technology entirely. Instead, it uses Anritsu's patented Non-Linear Transmission Line (NLTL) sampler technology. NLTL uses shockwave physics to create an incredibly sharp, perfectly stable harmonic sampling pulse. This directly results in the VectorStar having the lowest trace noise and highest dynamic range in the industry at high frequencies.
Vbias_network = DC to low MHz (Thermal memory effects, bias ringing).
RFcarrier = 28 GHz to 60 GHz (The actual 5G data transmission).
Harmonics = 60 GHz to 180 GHz (Non-linear distortion products).
If your VNA cannot see the low MHz, your transistor simulation model will be violently incorrect at DC. If it cannot see the high GHz, it cannot model the harmonics. VectorStar sees the entire physics model simultaneously.
Comparison
| VNA Performance Metric | Traditional Mixer VNA | VectorStar (NLTL) VNA |
|---|---|---|
| Lowest Frequency (Without banding) | ~ 10 MHz | 70 kHz (Incredible for Bias modeling) |
| Highest Frequency (Single Coax) | 67 GHz | 145 GHz (0.8mm connector) |
| Trace Noise at 100 GHz | High (Fuzzy data lines) | Ultra-Low (Crystal clear data) |
| Architecture | Step-Recovery Diodes | Shockwave Sampler Bridge |
Frequently Asked Questions
How can a coaxial cable support 145 GHz without failing?
Standard SMA cables fail at 18 GHz because the inner diameter of the cable is so large that the RF energy stops traveling straight (TEM mode) and starts bouncing chaotically off the walls (Waveguide Modeing). To force 145 GHz to travel straight, the coaxial cable must be physically microscopic. The VectorStar uses an ultra-precision 0.8mm coaxial connector. The center pin of this connector is literally thinner than a human hair, and must be tightened with extreme care using a highly calibrated torque wrench.
Why does the VectorStar use a massive separate console box?
Because thermal drift is the enemy of metrology. The massive VNA console contains the heavy power supplies, the computer motherboard, and the massive cooling fans. By keeping all this heat and vibration away from the actual NLTL RF sampler bridges (which are heavily thermally stabilized), the system maintains a phase stability that will not drift, even if the laboratory air conditioning turns on and off.
What is the difference between a 2-port and a 4-port VectorStar?
A 2-port VNA can only measure a single path (like input to output of an amplifier). A 4-port VNA contains massive internal switching matrices that allow it to measure differential circuits. Modern high-speed digital lines (like PCIe Gen 6 or 400G Ethernet) use 'Differential Signaling'—two wires carrying equal and opposite voltages. A 4-port VectorStar can inject two perfectly synchronized differential signals, allowing it to mathematically extract True-Mode S-parameters (Mixed-Mode S-parameters) of these digital lines.