Marki Microwave RF & Microwave Products by Frequency



BAL-0010 Broadband Balun image
An RF/microwave balun (or transformer) is a device that takes an input signal at a given impedance and outputs both the same signal and an inverted version of the signal at a (potentially) different output impedance. They are suitable for applications in differential signaling, integrated circuit testing, and general lab and experimental use. The main figures of merit for a balun are the amplitude (ideally 0 dB across the band) and phase balance (ideally 0 degrees, meaning perfectly 180 degrees out of phase, across the band).

Our BAL-0003, BAL-0006, and BAL-0010 are instrumentation grade 50 Ω input: 50 Ω output (100 Ω differential) baluns with excellent phase and amplitude match to kHz frequencies.

The surface mount baluns (BAL-0003SM/G and BAL-0006SM/G) are different circuit designs that fit in a .320” square package while offering broadband performance from kHz frequencies. These are available in leaded and ROHS compliant versions.

The high power balun variations (those with HP at the end of the model number) can be used as either 1:1 or 1:2 transformers (that is either 100 Ω or 50 Ω differential/ 50 Ω or 25 Ω single ended output). These baluns have reduced insertion loss but increased output return loss at the outputs when used in a 50 Ω system. They have a higher power handling capability of up to 10 W.

Electrical Specifications - Specifications guaranteed from -55 to +100°C, measured in a 50Ω system.
Parameter Frequency Range Min Typ Max
Nominal Insertion Loss (dB) 200 kHz to 10 GHz   6  
Nominal Phase Shift (Degrees)   180  
Amplitude Balance (dB)   ±0.2 ±0.6
Phase Balance (Degrees)   ±2 ±6
Common Mode Rejection (dB) 25 35  
Excess Insertion Loss (dB)1   2 3.5
Isolation (dB)   9  
VSWR (Input)   1.45  
VSWR (Output)   1.8  
Risetime /Falltime (ps)2   20  
Weight (g)     32  
1Excess Insertion Loss = (Common Port to Output Port Insertion Loss) – 6 dB. 2Specified as 90%/10%. Calculated from tbalun2= (tout2 – tin2)