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Bias Tee Features

• Resonance free performance to 65GHz
• Low frequency operation down to 4KHz
• Ultra-Small 0.033 sq in. (21.3 sq mm.) footprints
• Commonly used for amplifier bias, diode bias & DC level shifting

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.

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Surface Mounts

Marki Microwave surface mount bias tees are built using our proprietary wire-wound coil technology and precise assembly processes enabling ultra-broadband resonance-free operation in a compact .150” x .220” package. BTL models offer the lowest frequency extension, 500 kHz, with the option to extend down to 5 kHz by using an external coil. Optional bypass capacitors can be added near the DC input port to filter noise on the DC line. The BT models include the bypass capacitor on the DC line and operate down to 20 MHz. Common applications include amplifier bias, diode bias and for DC level shifting.

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Test & Measurement

Marki Microwave precision-assembled connectorized bias tees are built using our proprietary wire-wound coil technology for ultra-broadband resonance free operation with low insertion loss and high return loss from kHz to Ka-band. 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. Both models are capable of up to 2A of DC current, 50V of DC bias voltage, and 10 watt of RF power.
Marki offers a wide range of bias tees for both low and high power applications. Power handling of a bias tee is impacted by two major factors: the voltage rating of the DC blocking capacitor and the current handling capability of the wirewound coil. Our highest power bias tees use high voltage blocking capacitors and thick wire coils. It should be noted that high voltage capacitors are more prone to resonance due to parasitic inductance.

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