| dc.description.abstract | In this study, novel reconfigurable microwave passive components are proposed. First, a 0.5-GHz reconfigurable microwave circuit with four different circuit functions is presented. The four different functions are branch-line coupler, rat-race coupler, band-pass filter, and band-stop filter, which are achieved by using the p-i-n diode switches to change the interconnections of the microstrip lines. A design example in PCB is presented, and the circuit size is 130.2 mm × 104.9 mm, while the electrical size is around 0.4089 λg × 0.3294 λg at 0.5 GHz.
Secondly, a 10-GHz on-chip reconfigurable microwave passive component in GaAs pHEMT process is presented. By using bridged-T coils to replace the microstrip lines for circuit area reduction, and by using transistors to realize the switches, it can be switched to three different functions including branch-line coupler, band-pass filter, and band-stop filter. The circuit size is only 1.796 mm × 1.331 mm while the electrical size is around 0.060 λ0 × 0.044 λ0 at 10 GHz.
Driven by the demand of multi-frequency and multi-mode wireless communication apparatus, the design of a dual-band on-chip reconfigurable microwave passive component is also developed. Dual-band bridged-T coils are employed as the building blocks, and the functions of a dual-band branch-line coupler and a dual-band band-pass filter are achieved in a single circuit. The operating frequencies are set as 9.5 and 24 GHz, and it is also implemented using a GaAs pHEMT process. The circuit size is only 1.361 mm × 1.15 mm. The corresponding electrical size is around 0.043 λ0 × 0.036 λ0 at 9.5 GHz and 0.11 λ0 × 0.09 λ0 at 24 GHz. | en_US |