Suspended substrate bias-T at 2.5-10 GHz

An analysis of a radial suspended substrate (SS) stub-connected bias-T with the variational technique and cascade network theory is presented incorpor ating end effects and losses. Calculated frequency-dependent stub impedance s match well with published values from other techniques. Frequency-depende nt experimental results of SS butterfly-stub-connected lines show excellent agreement with those calculated. There is a minimum isolation of 15 and 13 dB between the bias and the high-frequency ports in the frequency ranges o f 4.4-14.0 and 2.8-9.2 GHz, respectively. The Il transmission loss between the high-frequency ports is less than or equal to 5 dB in the same frequenc y range. (C) 2000 John Wiley & Sons, Inc.