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Bias Tee Features

• Resonance free performance to 65GHz
• Low frequency operation down to 4KHz
• Ultra-Small 0.036 sq in. (23.2 sq mm.) footprints

Learn More About Bias Tees

A bias tee offers the ability to apply or detect a DC voltage on a high frequency signal. The important specifications of a bias tee include insertion loss, insertion loss flatness, group delay flatness, and return loss between the high frequency and common ports. Also important are isolation between the DC port and high frequency port, and power handling for both the DC port and high frequency port. For digital data applications it is important to select a bias tee with sufficient bandwidth on both the low and high frequencies and flat group delay across the band to prevent signal degradation.

Filters

Surface Mounts

Marki surface mount bias tees are built on a thin softboard substrate to enable high frequency operation. Marki produces high Q, small form factor, wire wound coils specifically for use in our surface mount bias tees. By using these internally produced coils and precisely controlling the assembly we can offer a smaller, higher frequency, resonance free bias tee than what is possible using commercially available wire wound coils. Most models (the 14, 24, and 34 GHz units) offer the option of using an external coil to extend the low end to the kHz range. Bypass capacitors can be added near the DC input port by the user to filter noise on the DC line. The 30 GHz model includes a bypass capacitor on the DC line that prevents low frequency extension, but provides noise filtering from the DC line.

Modules

As with surface mount bias tees, connectorized bias tee modules are built using Marki’s proprietary wirewound coil technology. Precision assembly allows for ultra-broadband resonance free operation in two different models. The BT models offer the lowest frequency coverage down to 4 kHz using large integrated inductors. The more compact BTN models offer the same high frequency coverage without the large integrated inductors. These models are all capable of 500 mA of DC current, up to 30V of DC bias voltage, and 1 watt of RF power.

High Power

There are two major limitations on the DC power handling of a bias tee: the voltage rating of the DC blocking capacitor and the current handling capability of the wirewound coil. Marki high power bias tees use high voltage blocking capacitors, which are more prone to resonance due to parasitic inductance. In addition to DC voltage, these capacitors allow high RF power of 10 watts for lower frequency and 5 watts for higher frequency bias tees. These bias tees also use proprietary wirewound coils with thick wire allowing for higher current capability.

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