Design methodology, measurement and application of MMIC transmission line transformers

A novel compact balun structure for multilayer MMICs

“…Simulated results using an accurate quasi-static tool [10] and a commercial 2.5D EM tool [11] independently show excellent balance and low reflection over a broad frequency range. Design methodology of these components is similar to TLT impedance transformers [12], and will be described in this paper.…”

Broadband Planar 5:1 Impedance Transformer

“…Examples have been implemented in monolithic microwave integrated circuits [4], [8], [9], several were implemented with coupled microstrip lines [10], [11], and one recent example for superconducting applications was implemented as a 6.25 to 25 transformer from 2-13 GHz [12].…”

Improved compaction of multilayer MMIC/MCM baluns using lumped element compensation

“…This tool has been verified repeatedly in the past by comparisons with measurements performed on similar components and with 2.5D EM results generated by another commercial simulator [7] , [8]. Therefore, it can be considered as a reliable basis for the investigation conducted here and was used to compute the impedance Z(f) as seen into the openended TL-type spiral-shaped compensation structure of Fig.…”

“…In order to look into the details of the impedance representation required, the same field-theory based quasi-TEM multilayer simulation tool already applied in [3], [4], with an earlier version described in [7], [8] has been used. This tool has been verified repeatedly in the past by comparisons with measurements performed on similar components and with 2.5D EM results generated by another commercial simulator [7] , [8].…”

“…4(a), (b) and (c). Besides the previous verification of the quasi-TEM multilayer tool [7], [8] used to generate these simulation results, further evidence of the correctness of these results was produced by independent computations made with the commercial package LIN-MIC+/N [9] which will ble included in the presentation. Fig.…”