P2N-7 Wide Bandwidth SAW Chirp Filters with Improved Magnitude Response

Gong, Jinlong; Zhang, Y.; Zhou, Xukai; Hartogh, P.

doi:10.1109/ultsym.2006.478

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Where C 2 and C 1 represent the quadratic and first‐order coefficients of the second‐order function, respectively, and C 0 is a constant term.

H ((), t) goodbreak= rect ((), \frac{t - t_{1}}{T_{1}}) W ((), t) \cdot \cos ((), italicωt goodbreak\pm \frac{1}{2} μ t^{2} goodbreak+ φ),

ϕ goodbreak= C_{2} f^{2} goodbreak+ C_{1} f goodbreak+ C_{0} .

The surface acoustic wave filter, is also called a dispersion delay line. In the CTS system, it acts as a matched filter for the input chirp waveform and outputs a narrow compressed pulse 13 . The time bandwidth product is an important parameter of the SAW filter, which can realize the measurement requirements of wide bandwidth and large compression gain 14 .…”

Section: Design Of a Wide Bandwidth Cts Systemmentioning

confidence: 99%

“…In the CTS system, it acts as a matched filter for the input chirp waveform and outputs a narrow compressed pulse. 13 The time bandwidth product is an important parameter of the SAW filter, which can realize the measurement requirements of wide bandwidth and large compression gain. 14 While realizing a large time-bandwidth product, the influence of passband ripple and phase error on matched filtering is minimized as much as possible.…”

Section: Where Rect Tàtmentioning

confidence: 99%

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A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

Liu

Gong

et al. 2021

Micro & Optical Tech Letters

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With the advantages of low power consumption and high stability, chirp transform spectrometer (CTS) has become a powerful tool widely used in spectrum analysis today. In recent years, compared with other spectrum analyzers, CTS is limited by the lack of bandwidth, which severely restricts its application and development. In this article, a CTS system with a wide bandwidth is proposed. The chirp signal with 2 GHz bandwidth is generated by DAC and multiplier, and its dispersion characteristics are matched with a 1 GHz bandwidth surface acoustic wave (SAW) filter to build a spectrum analyzer with an analysis bandwidth of 1 GHz. Experimental results show that the system frequency resolution can reach up to 102 kHz, which is very close to the theoretical value (100 kHz).

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“…Where C 2 and C 1 represent the quadratic and first‐order coefficients of the second‐order function, respectively, and C 0 is a constant term.

H ((), t) goodbreak= rect ((), \frac{t - t_{1}}{T_{1}}) W ((), t) \cdot \cos ((), italicωt goodbreak\pm \frac{1}{2} μ t^{2} goodbreak+ φ),

ϕ goodbreak= C_{2} f^{2} goodbreak+ C_{1} f goodbreak+ C_{0} .

Section: Design Of a Wide Bandwidth Cts Systemmentioning

confidence: 99%

Section: Where Rect Tàtmentioning

confidence: 99%

A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

Liu

Gong

et al. 2021

Micro & Optical Tech Letters

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show abstract

“…Meanwhile for many years the development of such devices was reduced. From one side their earlier used methods such as variable profile etched grooves [2] [3], is not available commercially now; and from another side SAW device technology also has made significant progress during the last decades. The RAC devices were produced on piece by piece basis and were extremely expensive due to many fabrication steps such as phase correction which demand unique approach for every device.…”

Section: Introductionmentioning

confidence: 99%

Revisiting of RAC devices

Plessky²,

Hartogh

et al. 2009

2009 IEEE International Ultrasonics Symposium

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The development of RAC devices usually is focused on 2 goals, to minimize the insertion loss and phase deviation of S21(f ) from ideal quadratic dependence. For large bandwidth RAC filter, to have the balance between the 2 goals, amplitude weighting technique is needed. One hand it can reduce too high reflectivity at certain frequency so as to control the multiple reflections which will cause phase diviation; and on another hand it can realise a flat passband so to have good compressed pulse shape. To avoid the profile depth etching, we concentrated on methods of weighting on reflecting structures. Comparing different type of reflectors and different methods of weighting their reflectivity, we found that the best results can be obtained using grooves of uniform depth along the structure and weighting by variation of the duty cycle of grooves. For typical down chirp device with B=400MHz, T=20us this approach results in the variation of the groove width duty cycle from about 10% to fully 50%.Then the narrowest width is about 220nm, i.e. very close to the critical dimension of photo lithography(100nm). Therefore we have used the standard e-beam lithography equipment for precise exposure of the weighted groove array. With this method, BT=8000 RAC filters with total insertion loss 55dB and RMS phase deviation 15 degrees was developed.

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“…For these reasons, DDLs have remained very expensive and are produced on a piece-by-piece basis. At present, however, there is a renewed interest [2] to use them in such devices as ultra wide band (UWB) communication systems and real-time spectrum analyzers.…”

Section: Introductionmentioning

confidence: 99%

Narrow electrodes on YZ-LiNbO₃ as an alternative to etched grooves for dispersive delay lines

Harma

Kim

Balashov³

et al. 2008

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

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Narrow, open-circuited aluminum electrodes can provide controllable, weak reflectivity necessary for many applications such as surface acoustic wave (SAW) tags and dispersive delay lines (DDLs). We show, using finiteand boundary element method (FEM-BEM) based simulations and experiments, that a reflectivity of 0.3% per wavelength can be achieved easily and controlled by varying the electrode width.

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P2N-7 Wide Bandwidth SAW Chirp Filters with Improved Magnitude Response

Cited by 4 publications

References 4 publications

A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

Revisiting of RAC devices

Narrow electrodes on YZ-LiNbO₃ as an alternative to etched grooves for dispersive delay lines

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P2N-7 Wide Bandwidth SAW Chirp Filters with Improved Magnitude Response

Cited by 4 publications

References 4 publications

A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

A spectrum analyzer system with wide bandwidth and high frequency resolution based on chirp transform

Revisiting of RAC devices

Narrow electrodes on YZ-LiNbO3 as an alternative to etched grooves for dispersive delay lines

Contact Info

Product

Resources

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Narrow electrodes on YZ-LiNbO₃ as an alternative to etched grooves for dispersive delay lines