A Design for SAW-Filters with Multistrip Couplers

Ruppel, C.C.W.; Ehrmann-Falkenau, E.; Stöcker, Hartmut; Mader, W.

doi:10.1109/ultsym.1984.198254

Cited by 16 publications

(5 citation statements)

References 5 publications

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“…Many excellent design techniques are available for filters with uniformly sampled IDTs. Optimization programs like linear programming [2], [3], the Remez exchange algorithm [4], and the quasi-Newton method [5] can be used for the linear design. Together with compensation procedures [6]- [9] and accurate analysis [2], [10]- [14], it is possible to design filters with accurately shaped passband and desired stopband rejection.…”

Section: Design Of the Saw Delay Linementioning

confidence: 99%

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Reindl

Ruppel²,

Berek³

et al. 2001

IEEE Trans. Microwave Theory Techn.

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An inexpensive frequency-modulated continuous-wave (FMCW) radar system is presented in this paper, which, nevertheless, meets all industrial requirements. The FMCW radar uses a low-cost nonlinear voltage-controlled oscillator (VCO), operating at an IF of 2.45 GHz to generate the frequency modulation of the radar system. This VCO signal is applied twice, first to generate the radar transmitter signal at 24 GHz, and then it is fed to a surface acoustic wave (SAW) delay line. The SAW delay line generates a fixed delay time, which corresponds with a fixed radar distance. Thus, all systematic nonlinearities and stochastic phase errors of the FMCW system can be monitored and, afterwards, can be compensated for in real time. This linearization technique leads to a significant enhancement in dynamic range for a FMCW radar system. For this FMCW system, SAW delay lines with a linear phase characteristic have been designed using a linear optimization program. The delay line consists of two chirped and weighted interdigital transducers. For high volume, low-cost, and high-yield production of the required SAW structures, with linewidths down to 0.3 m, technological improvements had to be achieved, especially in photolithography. Based on these design and fabrication techniques, delay lines at 2.45 GHz operating at the fundamental and third harmonic with bandwidths up to 800 MHz have been realized.

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Section: Design Of the Saw Delay Linementioning

confidence: 99%

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Reindl

Ruppel²,

Berek³

et al. 2001

IEEE Trans. Microwave Theory Techn.

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“…Remez exchange algorithm [10] has been used to obtain impulse response coefficients for the desired response. Zeros of the filters were obtained, and then separated in two parts by the method described by Ruppel et al [11] to implement on input and output transducers. One can easily find the impulse response coefficients for each transducer by finding polynomial corresponding to zeros of the transducer.…”

Section: A Desired P-matrixmentioning

confidence: 99%

An iterative approach to design a SAW filter having desired response

Priyanka

Joshi

Panwar

2005

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

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“…In such cases, it is difficult to apply the conventional decomposition procedure [6] directly, because zeros of polynomial to be calculated increase to the order of thousands. In this paper, sampled weighting decomposition procedure is employed.…”

Section: Sampling Of Tapsmentioning

confidence: 99%

“…To obtain a better approximation, the original weighting function is decomposed into two functions such that number of small weights decrease in the decomposed functions. A decomposition procedure, referred to as zero separation method [6], has been reported. However, it is difEicult to apply the procedure directly when thousands of taps are required, because zeros of polynomial to be calculated increase to the order of thousands.…”

Section: Introductionmentioning

confidence: 99%

A narrow transition bandwidth SAW filter using withdrawal weighting with decomposed weighting functions

Nagatsuka¹,

Misu²,

Kimura³

et al. 1993

1993 Proceedings IEEE Ultrasonics Symposium

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Thousands of taps with small weights are required for IDTs to achieve narrow transition bandwidths in SAW filters used for satellite applications. In this paper, withdrawal weighting for IDTs is employed to eliminate difiaction problems encountered in overlap weighting. To obtain a good approximation, an original weighting function is decomposed into two functions such that number of small weights decreases. In the decomposition procedure, the so called zero separation method is applied to the sampled original weighting function, because it is difficult to calculate zeros of thousands order polynomial. The decomposed functions are interpolated, and then approximated by withdrawal weighting. The resultant two weighting functions are applied to input and output IDTs respectively.

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A Design for SAW-Filters with Multistrip Couplers

Cited by 16 publications

References 5 publications

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

Design, fabrication, and application of precise SAW delay lines used in an FMCW radar system

An iterative approach to design a SAW filter having desired response

A narrow transition bandwidth SAW filter using withdrawal weighting with decomposed weighting functions

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