Wideband Microwave Filters Using FMR Tuning in Flip · PDF fileWideband Microwave Filters...
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Outline I.Introduction II.Band-Stop Filters Basic Band-Stop Filter Configuration Schemes for Enhancement of Tunable Bandwidth and Peak Absorption Level Performance Characteristics III.Band-Pass Filters Basic Band-Pass Filter Configuration Performance Characteristics IV.Conclusion *This work was Supported by UC Discovery Program and Wang, NMR Inc. • Presented at Int. Conf. on Microwave Magnetics, Sept. 12-14, 2008 Wideband Microwave Filters Using FMR Tuning in Flip-Chip YIG/GGG Layer Structures* Joe Zhu, Gang Qiu, Kai H. Chi, and Chen S. Tsai (PI) Department of Electrical Engineering and Computer Science and Institute of Surface and Interface Science, University of California, Irvine, CA 92697
Transcript of Wideband Microwave Filters Using FMR Tuning in Flip · PDF fileWideband Microwave Filters...
OutlineI.IntroductionII.Band-Stop Filters
Basic Band-Stop Filter Configuration Schemes for Enhancement of Tunable Bandwidth and Peak Absorption LevelPerformance Characteristics
III.Band-Pass FiltersBasic Band-Pass Filter ConfigurationPerformance Characteristics
IV.Conclusion
*This work was Supported by UC Discovery Program and Wang, NMR Inc.• Presented at Int. Conf. on Microwave Magnetics, Sept. 12-14, 2008
Wideband Microwave Filters Using FMR Tuning in Flip-Chip YIG/GGG Layer
Structures*Joe Zhu, Gang Qiu, Kai H. Chi, and Chen S. Tsai (PI)
Department of Electrical Engineering and Computer Scienceand Institute of Surface and Interface Science,
University of California, Irvine, CA 92697
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I. IntroductionResearch Motivation and Objective
Microwave band-stop and band-pass filters capable of wideband frequency selectivity with high absorption level and large absorption bandwidth are essential in many communication and radar systems for suppression of frequency parasitics, spurious bands or harmonics.To realize FMR-based tunable microwave band-stop and band-pass filters for wideband frequency selectivity with high peak FMR absorption and large stop or pass bandwidths.To accomplish the objective using FMR tuning in a flip-chip YIG/GGG layer structure and a SILPF micro-stripmeander line together with non-uniform magnetic field.
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II. Basic Configuration for Tunable Band-Stop Filter
γ 4 sMπanH0H
Tunable Microwave Band-Stop Filter using
YIG/GGG-GaAs Flip-Chip Configuration
Tuning of Ferromagnetic Resonance (FMR) Peak Absorption Frequency
Where is the gyromagnetic ratio, and , and are, respectively, the applied magnetic field, the saturation magnetization, and the anisotropic field of the YIG film
resf0H
0(H )resff
ƒres (H0)=γ[(H0+Han) (H0+Han+4πMs)]1/2
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II. Schemes for Enhancement of Tunable Bandwidth and Peak Absorption Level
Microwave band-stop filter using microstrip meander-line and non-uniform bias magnetic fields (GaAs:350um, YIG:6.8um). Note that each segment of the meander-line is made of a step-impedance low-pass filter (SILPF).
Simultaneous enhancement of FMR absorption level and widening of absorption bandwidth
ƒres (H0)=γ[(H0+Han) (H0+Han+4πMs)]1/2
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II. Measured S-parameters of The Band-Stop Filter using Microstrip Meander-line Structure
The microwave band-stop filter for wideband frequency selectivity (5-21 GHz) with high peak absorption level (>-35dB) and large absorption bandwidth (up to 1.60 GHz) was realized.
2 4 6 8 10 12 14 16 18 20 22 24-45
-40
-35
-30
-25
-20
-15
-10
-5
0
450MHz
1.60GHz
6,100 Oe 4,850 Oe 3,700 Oe 2,750 Oe
1,940 Oe 1,325 Oe
990 OeTran
smis
sion
Los
s (S
21) (
dB)
Frequency (GHz)
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II. Band-Stop Filter
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III. A Tunable Wideband Microwave Band-Pass Filter Using Cascaded Band-Stop Filters
The low- and high-end frequencies fr(H01) and fr(H02) of the pass-band are set by the bias magnetic fields H01 and H02, respectively.
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III. A Tunable Wideband Microwave Band-Pass Filter Using Cascaded Band-Stop Filters - Theoretical and
Experimental Results
Comparison between the measured and simulated transmission characteristics of the tunable wideband microwave band-pass filter.
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III. Band-Pass Filter
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IV. Conclusion
• The band-stop filters using a flip-chip YIG-GaAs layer structure and a SILPF microstrip meander-line in a non-uniform bias magnetic field have provided simultaneously enhanced FMR peak power absorption level and large absorption bandwidth.• The band-pass filters using a pair of the band-stop filters in cascade have provided large tuning ranges in operation center frequency and band bandwidth as well as large absorption bandwidth and power absorption level in the two guarding stop-bands.
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List of References
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