A design technique to enhance isolation of duplexer in single-ended and differential modes

Tsutsumi, J.; Inoue, S.; Iwaki, Masafumi; Hara, Motoaki; Nakamura, Hiroshi; Matsumoto, Kazuhiro; Ueda, Masahiko; Satoh, Y.

doi:10.1109/ultsym.2011.0458

Cited by 14 publications

(2 citation statements)

References 14 publications

(12 reference statements)

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“…Note that the upper band transmission zero has disappeared in the measurement response shown in Fig. 12(b), which may arise from the fact that some energy is coupled from the source to the load or from imperfect grounding [52]- [54]. The measured group delay response of the filter is shown in Fig.…”

Section: High-order Ladder-type Filtermentioning

confidence: 99%

Surface Acoustic Wave Devices Using Lithium Niobate on Silicon Carbide

Zhang

Zhou

et al. 2020

IEEE Trans. Microwave Theory Techn.

113

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This work demonstrates a group of shear horizontal (SH0) mode resonators and filters using lithium niobate (LiNbO 3) thin films on silicon carbide (SiC). The single-crystalline X-cut LiNbO 3 thin films on 4H-SiC substrates have been prepared by ion-slicing and wafer-bonding processes. The fabricated resonator has demonstrated a large effective electromechanical coupling (k 2) of 26.9% and a high-quality factor (Bode-Q) of 1228, hence resulting in a high figure of merit (FoM = k 2 • Bode-Q) of 330 at 2.28 GHz. Additionally, these fabricated resonators show scalable resonances from 1.61 to 3.05 GHz and impedance ratios between 53.2 and 74.7 dB. Filters based on demonstrated resonators have been demonstrated at 2.16 and 2.29 GHz with sharp roll-off and spurious-free responses over a wide frequency range. The filter with a center frequency of 2.29 GHz shows a 3-dB fractional bandwidth of 9.9%, an insertion loss of 1.38 dB, an out-of-band rejection of 41.6 dB, and a footprint of 0.75 mm 2. Besides, the fabricated filters also show a temperature coefficient of frequency of −48.2 ppm/ • C and power handling of 25 dBm. Although the power handling is limited by arc discharge and migration-induced damage of the interdigital electrodes and some ripples in insertion loss and group delay responses are still present due to the transverse spurious modes, the demonstrations still show that acoustic devices on the LiNbO 3-on-SiC platform have great potential for radio-frequency applications.

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Section: High-order Ladder-type Filtermentioning

confidence: 99%

Surface Acoustic Wave Devices Using Lithium Niobate on Silicon Carbide

Zhang

Zhou

et al. 2020

IEEE Trans. Microwave Theory Techn.

113

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“…One is the TX leakage via the signal line, and the other is caused by electromagnetic coupling and electrostatic coupling. Through use of a matching circuit at the antenna, the amplitude and the phase of the TX leakage can be adjusted to cancel out another leakage signal [ 8 , 9 , 10 ]. This duplexer has an isolation higher than 70 dB.…”

Section: Introductionmentioning

confidence: 99%

A Phase Canceling Technique to Improve SAW Duplexer Isolation

Tao

Tang²,

Zou

et al. 2023

Micromachines

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Spectrum resources are becoming increasingly crowded, and the isolation interval between different systems is getting smaller and smaller. This puts forward higher requirements for the duplexer. The duplexer is an important part of the radio frequency front end, and the isolation requirement is becoming higher. This paper presents a phase canceling circuit to improve the performance of the duplexer to meet the requirement of the communication system for isolation. A phase canceling circuit is an effective method to enhance the isolation through use of a surface acoustic wave (SAW) on-chip circuit. It contains a duplexer and a branch. The branch is designed for diminishing the leakage signal of the duplexer. Compared with the leakage signal, the branch consists of two attenuators and a phase shifter to generate a signal which has equal extent and reverse phase. As a result, this method is capable of increasing the isolation of band 5 by 12 dB in the downlink frequency. Meanwhile, it neither affects other factors, such as insertion loss or return loss, nor increases the size of the chip. The phase canceling circuit is expected to promote the quality of duplexer to satisfy the strict requirements in 4G and 5G systems.

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Properties of Coaxial Cables and Transmission Lines, Directional Couplers and RF Filters

Rudolph

2023

Fundamentals of RF and Microwave Techniques and Technologies

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A design technique to enhance isolation of duplexer in single-ended and differential modes

Cited by 14 publications

References 14 publications

Surface Acoustic Wave Devices Using Lithium Niobate on Silicon Carbide

Surface Acoustic Wave Devices Using Lithium Niobate on Silicon Carbide

A Phase Canceling Technique to Improve SAW Duplexer Isolation

Properties of Coaxial Cables and Transmission Lines, Directional Couplers and RF Filters

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