Study of a Fabry-Perot cavity in the microwave frequency range by the boundary element method," Absfruct-A method for deriving accurate L-band inductor models using 1-port 6xtured S-parameter measurements is presented, along with examples of successful filter designs using the models. Models were developed for a number of surface-mount and leaded devices with values ranging from 4.7 nH to 470 nH. The devices were measured in a coaxial test fixture on an HP8510B network analyzer, with fixture de-embeddmg performed using CAD software. The models are seen to fit measured data over a broadband, from low F W through resonance. To M e r validate the models, several filter circuits were developed and fabricated.The results of 5th-and 9th-order lowpass filter designs are presented here. The 9th-order Mter was optimized for the desired performance using the parasitic inductor models. Measurements confirm that the use of the models led to a successful design on the %rst pass." Finally, simulations show that this success would not have been achieved without the developed inductor models.
Methods for deriving accurate L-band inductor models using 1-port fixtured S-parameter measurements are presented, along with examples of modeled inductor data. The modeled inductors include both surface mount "chip" inductors with nominal values ranging from 4.7nH to 330nH, and wirewound "leaded" inductors with nominal values from 7.5nH to 470nH. The test fixture for the surface mount inductors consists of a CoilCraft 1-port coaxial fixture, whereas a modified SMA connector was used as a test fixture for the leaded inductors. In both cases, the measurements were taken using an HP8510B network analyzer, to d o w for careful modeling of the fixture. The fixture models were used to de-embed the time-delay and energy storage effects of the fixtures from the coaxially calibrated HP8510 measurements of the fixtured inductors. Using EESof's Libra CAD package and de-embedded 1-port S-parameter data, models were developed for 33 samples of 21 inductance values of chip inductors, and 22 samples of leaded inductors. The models are seen to fit the measured data over a broad band, from low RF through resonance. Models for devices which self-resonate above 1 GHz maintain close tracking to measured data over the L-band (1-2 GHz).TRL calibrated 2-port microstrip measurements of the inductors were performed to verify the models obtained from the 1-port measured data. The 2-port measurement data is seen to track the 1-port measurements well, with some uncertainty caused by the effect of the microstrip mounting gap.Simple lumped/distributed filter circuits employing the inductors also were fabricated and tested. The simulations show a close tracking between the predicted characteristics using the 1-port derived models and 2-port filter measurements..
'L.A Geb is with Honeywell
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