SAW-based solutions for UWB communications

Chomiki, M.

doi:10.1109/eumc.2005.1610357

Cited by 5 publications

(2 citation statements)

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“…7,8 In a conventional SAW device, SAW frequency is determined by the acoustic velocity of the substrate material, and the acoustic wavelength determined by the IDT design. Therefore, it has a fixed operating frequency without agility.…”

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confidence: 99%

“…1 Recently, SAW devices are also employed in wide area network, wireless local area network communications, wireless passive identifications tags, 2,3 various sensors, [4][5][6] and RF front-end for mobile communications. 7,8 In a conventional SAW device, SAW frequency is determined by the acoustic velocity of the substrate material, and the acoustic wavelength determined by the IDT design. Therefore, it has a fixed operating frequency without agility.…”

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Tunable SAW Devices Based on Ni:ZnO/ZnO/GaN Structures with Buried IDTs

Reyes

et al. 2017

ECS J. Solid State Sci. Technol.

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Tunable RF devices have promising applications in low-power resettable sensors, adaptive signal processing, and secure wireless communications. We report a tunable surface acoustic wave (SAW) device built on a multifunctional ZnO/GaN-based structure. The device consists of a piezoelectric Ni:ZnO (NZO) layer deposited on the top of a ZnO/GaN semiconductor heterostructure. The multifunctional ZnO layers are made through a hybrid deposition technique: RF sputtering of a piezoelectric NZO layer and metallorganic chemical vapor deposition (MOCVD) of a semiconducting n-type ZnO layer on the GaN/Al 2 O 3 substrate. This multifunctional and multilayer structure combines the large electromechanical coupling coefficient of ZnO and high acoustic velocities of GaN. The unique dispersion relationship in ZnO/GaN enables high-frequency (GHz) operation using higher order SAW modes. Two device configurations are designed: one with the interdigital transducer (IDT) exposed on the NZO surface, and one with the IDT buried inside NZO layer. Both devices operate at the GHz frequency. SAW frequency tuning is achieved by voltage controlled acoustoelectric interaction. The device using the buried IDT structure has better performance over the counterpart with exposed IDT SAW. The ZnO/GaN-based tunable SAW device with buried IDTs operating at 1.35 GHz has frequency tunability of Surface acoustic wave (SAW) devices are commonly used in communication and signal processing.1 Recently, SAW devices are also employed in wide area network, wireless local area network communications, wireless passive identifications tags, 2,3 various sensors, 4-6 and RF front-end for mobile communications. 7,8 In a conventional SAW device, SAW frequency is determined by the acoustic velocity of the substrate material, and the acoustic wavelength determined by the IDT design. Therefore, it has a fixed operating frequency without agility. However, many modern communication systems require multi-band and multi-mode capability for signal transmitting and receiving. With increasing demands for advanced wireless communication, such as IoT (Internet of Things), it is not practical to simply add more filters. Frequency tunable devices, such as adaptive filters, can process multi-channel signals, extend the operating bandwidth, and reduce the architecture complexity. Furthermore, tunability in the time or frequency response domain allows a reconfigurable system to smartly adapt to its operating environment.Tunable SAW devices are usually achieved through three different approaches: wavelength selection, perturbation of piezoelectric material properties, and perturbation of SAW boundary conditions. Wavelength selection is often referred as a filter bank, which provides frequency variations through switching between selectable IDTs. However, such "tuning" is not continuous due to the discrete switching among filters. Furthermore, the resulting large device area essentially excludes its applications in compact mobile systems. The perturbation of piezoelectric material proper...

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Tunable SAW Devices Based on Ni:ZnO/ZnO/GaN Structures with Buried IDTs

Reyes

et al. 2017

ECS J. Solid State Sci. Technol.

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SAW chirp Fourier transform for MB-OFDM UWB receiver

Wang

et al. 2006

The Journal of China Universities of Posts and Telecommunicatio

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Feasibility of ultra-wideband SAW RFID tags meeting FCC rules

Harma

Plessky

et al. 2009

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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We discuss the feasibility of surface acoustic wave (SAW) radio-frequency identification (RFID) tags that rely on ultra-wideband (UWB) technology. We propose a design of a UWB SAW tag, carry out numerical experiments on the device performance, and study signal processing in the system. We also present experimental results for the proposed device and estimate the potentially achievable reading distance. UWB SAW tags will have an extremely small chip size (<0.5 x 1 mm(2)) and a low cost. They also can provide a large number of different codes. The estimated read range for UWB SAW tags is about 2 m with a reader radiating as low as <0.1 mW power levels with an extremely low duty factor.

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SAW-based solutions for UWB communications

Cited by 5 publications

References 0 publications

Tunable SAW Devices Based on Ni:ZnO/ZnO/GaN Structures with Buried IDTs

Tunable SAW Devices Based on Ni:ZnO/ZnO/GaN Structures with Buried IDTs

SAW chirp Fourier transform for MB-OFDM UWB receiver

Feasibility of ultra-wideband SAW RFID tags meeting FCC rules

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