| dc.description.abstract | This thesis aims at miniaturization and integration of passive circuits, by reducing the size without sacrificing the bandwidth. This study proposes to replace the ideal transmission line with a bridge-T coil for miniaturized 15GHz and 60GHz Branch Line Couplers, 15GHz and 60GHz Rat race Couplers and configurable microwave passive circuits. In circuit implementation, inductors and parallel plate capacitors are used in complementary metal oxide semiconductor (CMOS 180nm process) and integrated passive component (IPD) processes to realize bridge-T coils and the proposed circuits.
First, the circuit design of miniaturized 15GHz and 60GHz branch line couplers and 15GHz and 60GHz rat race couplers in the CMOS 180nm process are presented. The circuit area of the 60GHz branch line coupler is 0.56 mm x 0.505 mm (electrical size 0.112 x 0.101λ_0^2 @ 60GHz), while the circuit size of the 15GHz one is 0.858 mm x 0.707 mm (electrical size 0.0429 x 0.0354 λ_0^2 @ 15 GHz). The circuit area of the 60GHz rat race coupler is 0.537 mm x 0.453 mm (electrical size is 0.107 x 0.09λ_0^2@ 60GHz),and the circuit area of the 15GHz design is 0.8488mm x 0.6554mm (electrical size 0.0424 x 0.0328λ_0^2 @15GHz), which is greatly reduced compared with the existing design.
Secondly, a configurable microwave passive components in IPD is proposed, which is based on a 4×9 bridge-T coil array. The connection between the bridged-T coils is determined by the bound wires. Nine different functions (rat race coupler, branch line coupler, power divider, bandstop filter @2GHz, 4GHz, bandpass filter @2GHz, 4GHz) are realized by changing the connection states of the bridged-T coils by using the bound wires. The circuit size is 8.7 mm x 8.1 mm. The above mentioned application circuits prove that the bridge -T coil can indeed achieve very effective size reduction of the passive circuits without reducing the bandwidth.
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