Recent Advances in Microwave Applications of Thin Ferroelectric Films at the NASA Glenn Research Center

ABSTRACTWe report on recent developments in microwave applications and understanding of thin Ba50Sr50TiO3films. Most of our recent efforts have focused on developing low loss, wide band phase shifters from X-band (8.4 GHz) to Ka-Band (26.5 GHz) for scanning reflectarray antennas. Attempts to reduce tanδ by Mn-doping Ba50Sr50TiO3films are briefly discussed. We have demonstrated a hybrid device at X-band that produces in excess of 300 degrees of phase shift with about 3.5 dB insertion loss and greater that 10% bandwidth. Preliminary results are presented here. The effects of mild (600 rad Si) proton radiation on device performance will also be discussed. Preliminary results on optical phase shifters will be included.

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Novel low loss wide-band multi-port integrated circuit technology for RF/microwave applications

2001 Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems. Digest of Papers (IEEE Cat. No.01EX496) ◽

10.1109/smic.2001.942341 ◽

2002 ◽

Cited By ~ 4

Author(s):

R.N. Simons ◽

L.K. Goverdhanam ◽

L.P.B. Katehi

Keyword(s):

Integrated Circuit ◽

Wide Band ◽

Low Loss ◽

Microwave Applications ◽

Circuit Technology ◽

Rf Microwave

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One and two-bit low-loss cascadable MEMS distributed X-band phase shifters

2000 IEEE MTT-S International Microwave Symposium Digest (Cat No 00CH37017) MWSYM-00 ◽

10.1109/mwsym.2000.860916 ◽

2002 ◽

Cited By ~ 12

Author(s):

J.S. Hayden ◽

G.M. Rebeiz

Keyword(s):

Phase Shifters ◽

Low Loss ◽

X Band

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Low-loss cascadable MEMS distributed X-band phase shifters

IEEE Microwave and Guided Wave Letters ◽

10.1109/75.846926 ◽

2000 ◽

Vol 10 (4) ◽

pp. 142-144 ◽

Cited By ~ 51

Author(s):

J.S. Hayden ◽

G.M. Rebeiz

Keyword(s):

Phase Shifters ◽

Low Loss ◽

X Band

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Very low-loss distributed X-band and Ka-band MEMS phase shifters using metal-air-metal capacitors

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/tmtt.2002.806520 ◽

2003 ◽

Vol 51 (1) ◽

pp. 309-314 ◽

Cited By ~ 98

Author(s):

J.S. Hayden ◽

G.M. Rebeiz

Keyword(s):

Phase Shifters ◽

Low Loss ◽

Ka Band ◽

X Band

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A true-time-delay networks design technique

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078714001408 ◽

2014 ◽

Vol 8 (2) ◽

pp. 155-164 ◽

Cited By ~ 1

Author(s):

Alberto Leggieri ◽

Davide Passi ◽

Franco Di Paolo

Keyword(s):

Time Delay ◽

Numerical Solutions ◽

Wide Band ◽

Phase Shifters ◽

Single Frequency ◽

Phased Array Antenna ◽

True Time Delay ◽

X Band ◽

True Time ◽

Spatial Positioning

This paper proposes a technique to design wide band switched-line (SL) true-time-delay (TTD) networks, commonly used for phased array antenna (PAA) applications. This study investigates the constant-delay behavior of switched-line phase shifters based on single-pole double-throw (SPDT) switches. Circuit sizing starts by considering the effective S-parameters of the switches, to use their non-idealities as an integral part of the phase shift linearly dependent to the frequency and by considering, from the beginning, the possible spatial positioning of elements that allows the circuit feasibility as a design target. The aim of this study is to provide a technique suitable for the design of well-matched TTD networks with a flat delay in wide bandwidth. In this paper, we propose new design formulas for which we show a single-frequency implementation. A computational strategy is used to obtain numerical solutions of the derived equations with this study. Finally, a monolithic X-band TTD circuit example is shown.

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