Computer-Aided Analysis of Dissipation Losses in Isolated and Coupled Transmission Lines for Microwave and Millimeter-Wave Integrated-Circuit Applications

1976 ◽  
Author(s):  
Barry E. Spielman
Keyword(s):  
Millimeter Wave ◽  
Transmission Lines ◽  
Integrated Circuit ◽  
Computer Aided Analysis ◽  
Computer Aided ◽  
Coupled Transmission Lines ◽  
Millimeter Wave Integrated Circuit ◽  
Dissipation Losses

Millimeter-wave coplanar stripline power dividers

2013 ◽  
Vol 5 (3) ◽  
pp. 205-212 ◽  
Author(s):  
Chong Li ◽  
Lai Bun Lok ◽  
Ata Khalid ◽  
Vasileios Papageorgiou ◽  
James Grant ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Transmission Lines ◽  
Integrated Circuit ◽  
Wave Length ◽  
Three Dimensional ◽  
Ultra Wideband ◽  
Main Body ◽  
Phase Inverter ◽  
Power Dividers ◽  
Consistent Performance

We present the design, fabrication, and measurement of a 2-way modified Wilkinson divider constructed in a coplanar geometry exhibiting ultra wideband isolation, transmission, and port matching in the millimeter-wave frequency range. The proposed divider replaces the lumped resistor in the conventional Wilkinson divider with two quarter-wave length transmission lines, a phase inverter, and two 2Z0 resistors. Except for the three ports that are coplanar waveguides (CPWs), the main body of the divider uses coplanar striplines (CPS). The phase inverter is realized using a simple airbridge-based crossover which is compatible with a modern monolithic microwave integrated circuit process. The divider has a ring-like configuration fabricated on a 620 µm thick semi-insulating GaAs wafer using electron beam lithography (EBL) technology. Three-dimensional (3D) full-wave electromagnetic simulations have been carried out to optimize the design and investigate the possible effect of fabrication tolerance on the performance of the crossover and the divider. Two dividers working at center frequencies of 25 and 80 GHz have been designed, fabricated, and tested. They all show consistent performance in terms of bandwidth, isolation, and port matching. Experimental and simulation results are in excellent agreement.

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