Transversely coupled resonator filters

Martin, G.

doi:10.1109/ultsym.1999.849347

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…The bandwidths 4 BW =0.483% and 5 BW =0.478% can be achieved in TCRFs with purely acoustically coupled four-and five-resonator structures, respectively. Spurious resonances in the stop band reduce the real bandwidth approximately by factor about 2.…”

Section: Resultsmentioning

confidence: 99%

“…Such an increase causes the deviation of the transfer function from Butterworth's one, since the shape factor SH = 3 / 40 BW BW becomes impaired and insertion loss grow because of matching problems to be discussed bellow. Calculations yield that insertion loss change from IL =2.7 dB to IL =6.5 dB for bandwidths 4 BW =0.04-0.125%, respectively. As to the shape factor, it impairs, increasing from SH =3.2 for ideal Butterworth's function to SH =4.0 for quasi Butterworth's function.…”

Section: Filters With Modified Acoustic Couplingmentioning

confidence: 99%

“…One approach uses structures of section with three [2] or four [3] acoustically coupled resonators to increase the number of useful transverse modes. Another approach combines two longitudinal modes and two transverse modes to achieve the four-pole response of the filter [4].…”

Section: Introductionmentioning

confidence: 99%

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Design of wide band transversely coupled resonator filters on quartz

Chvets¹,

Schwartz²,

Orlov³

2002 IEEE Ultrasonics Symposium, 2002. Proceedings.

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Typical relative bandwidth of transversely coupled resonator filters (TCRF) on quartz wafers varies between BW =0.05 to 0.1%. In this paper, we investigate the factors restricting the bandwidth and describe some specific features of designing TCRF with more expanded bandwidth BW =0.15-0.3%, on quartz. The results of investigation are illustrated by experimental characteristics of four TCRF types: 315 MHz filter with BW =0.28%, 248 MHz filter with BW =0.18%, 402 MHz filter with BW =0.125% and 360 MHz filter with BW =0.064%. All filters are manufactured on quartz wafer, cut 33.3°-YX, in packages SMD 3.8x3.8x1.4 mm.

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Section: Resultsmentioning

confidence: 99%

Section: Filters With Modified Acoustic Couplingmentioning

confidence: 99%

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Design of wide band transversely coupled resonator filters on quartz

Chvets¹,

Schwartz²,

Orlov³

2002 IEEE Ultrasonics Symposium, 2002. Proceedings.

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A chirp-based wideband spread spectrum modulation technique for WLAN applications

Gugler¹,

Springer²,

Weigel³

2000 IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications. ISSTA 2000. Proceedings (Cat. No.00TH85

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A bstract-A high data-rate wideband chirp spread spectrum system for indoor communications is presented. We propose the use of chirp signals with the well known pulse compression technique to make the system extremely robust and therefore suitable for applications in industrial environment. By using rI4-DQPSK modulation of the chirp signals, overlapping &irp signals, and optimized chirp signal design we achieve data rates up to 70 Mbps. There is no need for sophis-chirp-based wideband (> 50 MHz) spread spectrum system which will be shown to be insensitive against nonidealities in the implementation (e.g. frequency offset, production tolerances, nonlinearities). As a consequence a very cheap realisation is possible. In our w ork theprocessing and generation of the needed chirp signals is done by means of surface acoustic mve (SAW) devices. They are well established in toda y's wireless communication products [4] due to their high performance and low cost. THEORYticated digital signal processing due to the use of surface acoustic wave (SAW) filters for the generation and filtering of the chirp signals. system imperfections like production tolerances, temperature drift, nonlinearities, and others are shown to be either negligible or can be easily handeled. Simulation results reveal that the limiting faccaused by multipath propagation.The presented spread spectrum communication system is based on the well known principle of pulse compression with linear chirp signals [5]. The representation of a linear chirp waveform is giwn as (1) tor for the data rate is in tersydol interference in the time f < < $ 7 where T > a (')> fo = 2, and p are the chirp duration, the envelope,the center frequency, and the chirp rate, respectively. The chirp

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