High frequency performance extending to millimeter-waves in inverted-microstrip-line-type LC phase shifter

2013 ◽  
Author(s):  
T. Nose ◽  
Y. Ito ◽  
Takuya Iisaka ◽  
L.-C. Chien ◽  
O. Catanescu ◽  
...  
Keyword(s):  
High Frequency ◽  
Millimeter Waves ◽  
Microstrip Line ◽  
Phase Shifter ◽  
Line Type ◽  
High Frequency Performance

Improved High-Frequency Performance of Microstrip-Line-Type Liquid Crystal Phase Shifter

2013 ◽  
Vol 52 (9R) ◽  
pp. 091701 ◽  
Author(s):  
Toshiaki Nose ◽  
Liang-Chy Chien ◽  
Otilia Catanescu ◽  
Andrii Golvin ◽  
Yusuke Ito ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
High Frequency ◽  
Microstrip Line ◽  
Phase Shifter ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Line Type ◽  
High Frequency Performance

Fundamental Properties of Novel Design Microstrip Line Type of Liquid Crystal Phase Shifter in Microwave Region

2012 ◽  
Vol 51 (4R) ◽  
pp. 044104 ◽  
Author(s):  
Ryouta Ito ◽  
Takayuki Kawakami ◽  
Yusuke Ito ◽  
Takayuki Sasamori ◽  
Yoji Isota ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Microstrip Line ◽  
Phase Shifter ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Microwave Region ◽  
Fundamental Properties ◽  
Novel Design ◽  
Line Type

scholarly journals Potential of Liquid-Crystal Materials for Millimeter-Wave Application

2018 ◽  
Vol 8 (12) ◽  
pp. 2544 ◽  
Author(s):  
Toshiaki Nose ◽  
Ryota Ito ◽  
Michinori Honma
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Microstrip Line ◽  
Phase Shifter ◽  
Substrate Surface ◽  
Antenna System ◽  
Phase Shifters ◽  
Phased Array Antenna ◽  
Electric Circuits ◽  
Line Type

In this study, we reviewed three topics regarding the application of liquid-crystal (LC) materials to millimeter-wave (MMW) devices. It is essential to develop useful measurement methods for refractive indices of LC materials in the MMW region. Herein, a novel measurement method using optical short is demonstrated using a Si semiconductor substrate. There are two approaches to develop MMW LC devices. One is the quasi-optical approach, which involves scaling up the optical components, and the other approach involves integrating the LC materials into high-frequency electric circuits. A three-dimensional (3D) printer is used to fabricate the Fresnel lens, which is a typical quasi-optical device useful in the MMW region, where we can develop the tunable lens by introducing LC materials. A planar-type MMW waveguide is advantageous for integrating the LC materials to develop LC MMW devices using the second approach. We investigated a useful microstrip-line-type LC phase shifter by developing a novel conversion circuit to introduce the LC material onto the dielectric substrate surface. A phase shifter is an important MMW component that is used to attain a phased array antenna system, and a minimal twin antenna array is demonstrated using the microstrip-line-type LC phase shifters.

Fundamental Properties of Novel Design Microstrip Line Type of Liquid Crystal Phase Shifter in Microwave Region

2012 ◽  
Vol 51 ◽  
pp. 044104 ◽  
Author(s):  
Ryouta Ito ◽  
Takayuki Kawakami ◽  
Yusuke Ito ◽  
Takayuki Sasamori ◽  
Yoji Isota ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Microstrip Line ◽  
Phase Shifter ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Microwave Region ◽  
Fundamental Properties ◽  
Novel Design ◽  
Line Type

DC and high frequency performance of 0.1 [micro sign]m n-type Si∕Si0.6Ge0.4 MODFET with fMAX=188 GHz at 300K and fMAX=230 GHz at 50K

2003 ◽  
Vol 39 (1) ◽  
pp. 149 ◽  
Author(s):  
M. Enciso-Aguilar ◽  
F. Aniel ◽  
P. Crozat ◽  
R. Adde ◽  
H.-J. Herzog ◽  
...  
Keyword(s):  
High Frequency ◽  
High Frequency Performance

High-frequency performance of separate absorption grading, charge, and multiplication InP/InGaAs avalanche photodiodes

1993 ◽  
Vol 5 (6) ◽  
pp. 672-674 ◽  
Author(s):  
L.E. Tarof ◽  
J. Yu ◽  
R. Bruce ◽  
D.G. Knight ◽  
T. Baird ◽  
...  
Keyword(s):  
High Frequency ◽  
Avalanche Photodiodes ◽  
High Frequency Performance
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