Bias tees are passive RF circuits which provide DC bias to an
active device under test. Normally consisting of a capacitor and
inductor, bias tees act as diplexers by combining low-frequency
(DC) and high frequency (RF) signals onto a common port
(RF+DC). In a classic capacitor/inductor design, the capacitor
acts as a DC block and prevents DC bias from entering the RF
path, while the inductor acts as an RF choke preventing RF
energy from entering the DC instrumentation.
Typical applications include providing bias to amplifiers inside
of complex systems including base stations and radios; and
biasing discrete transistors or packaged devices in test and
measurement applications such as DC/pulsed-bias S-parameters,DC/pulsed-IV, DC/pulsed-bias load pull, stability-, robustness-,
burn-in-, pre-production- and production-test.
Important characteristics of a bias tee include the frequency
range over which the bias tee will function with minimal to no
performance degradation, the insertion loss and VSWR (or return
loss) over the usable frequency range of the bias tee. Voltages,
currents and RF powers are critical both in average/DC/CW and
pulsed/peak operations. It is also essential to have bias tees with
minimal overshoot of the signals under pulsed bias/pulsed RF
The MBT-series of bias tees is based on Maury's patented broadband capacitor (US Patent 9,614,267) which simultaneously enables the industry's widest bandwidth, lowest insertion loss and lowest return loss in a coaxial bias tee up to 18 GHz. In addition, its unique design makes it ideal for pulsed applications, including pulsed IV and pulsed load pull characterization, without distorting the voltage and current waveforms.
U.S. Patent No. 9,614,267
High RF Power Handling
High Breakdown Voltage
High Current Handling
Low Insertion Loss
Excellent Return Loss
High-Power System Biasing
High-Power Base Station Integration
Test and Measurement (Load Pull, Pulsed Measurements, General Lab...)
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