The smooth spectral counting function and the total phase shift for quantum billiards

1996 ◽  
Vol 29 (10) ◽  
pp. 2587-2597 ◽  
Author(s):  
Uzy Smilansky ◽  
Iddo Ussishkin
Keyword(s):  
Phase Shift ◽  
Counting Function ◽  
Spectral Counting ◽  
Total Phase

Design & Modeling of 6-Bit Low Loss Ka Band Distributed MEMS Phase Shifter on GaAs

2011 ◽  
Vol 403-408 ◽  
pp. 4179-4183
Author(s):  
Anesh K. Sharma ◽  
Ashu K. Gautam ◽  
D.V.K. Sastry ◽  
S.G. Singh
Keyword(s):  
Phase Shift ◽  
Insertion Loss ◽  
Phase Shifter ◽  
Structural Parameters ◽  
Coplanar Waveguide ◽  
Actuation Voltage ◽  
Ka Band ◽  
Rf Systems ◽  
Total Phase ◽  
Digital Phase Shifter

This paper presents the design & modeling of distributed MEMS phase shifter for Ka band RF systems. The phase shift can be achieved by periodically placing the MEMS bridge variable capacitors as per Bragg frequency criteria on coplanar waveguide (CPW) using GaAs substrate. The EM & electromechanical simulation are carried out with various structural parameters to optimize the designs. The novelties like low insertion loss, low actuation voltage with distributed actuation pads & separate DC and RF are used to make the design unique. The EM simulations are carried out with HFSS and an insertion loss of -3.49 dB at 36GHz for a total Phase shift of 360 deg. was achieved with return loss of - 20.6 dB over a frequency band 34-38 GHz. The electromechanical simulations are carried to achieve the low actuation voltage of 10.3V. The significance of this study is the realization of the digital phase shifter through DMTL approach.

Design & Simulation of Low Loss 5-Bit Ku Band Switched Line MEMS Phase Shifter on Gaas

2011 ◽  
Vol 403-408 ◽  
pp. 5330-5334
Author(s):  
Anesh K. Sharma ◽  
Ashu K. Gautam ◽  
D.V.K. Sastry ◽  
S.G. Singh
Keyword(s):  
Phase Shift ◽  
Return Loss ◽  
Phase Shifter ◽  
Rf Mems ◽  
Structural Parameters ◽  
Actuation Voltage ◽  
Low Loss ◽  
Total Phase ◽  
Phase Shift Error ◽  
Ku Band

As the requirement for the low loss phase shifter increases, so does the development of RF MEMS as a solution. This paper presents the design & simulation of Switched line MEMS phase shifter for Ku band using GaAs substrate. The phase shift can be achieved by varying the lengths in delay path to the reference path for the same phase velocity. The electromagnetic & electromechanical simulations were carried out with various structural parameters to optimize the design. The novelties like low insertion loss, low actuation voltage with distributed actuation pads for DC and RF are used to make the design unique. The EM simulations are carried out using 3D simulator HFSS and a phase shift of 172.6 deg./dB for a total Phase shift of 348.75deg was achieved with return loss of 15.5dB over a frequency band from 16-18 GHz and a phase shift error less than ±2 degree in the 32 states. The electromechanical simulations are carried to achieve the low actuation voltage of 15.3V. These parameters make these suitable for the Phased array applications [1, 2].

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