Surface Acoustic Wave Slanted Correlators for Linear FM Pulse-Compressors

Potter, B.R.; Hartmann, C.S.

doi:10.1109/ultsym.1977.196905

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…• SAW transversal filters using three-phase unidirectional transducers (UDTs) [5,15,24,25,30,33] and/or withdrawal weighting [19], • SAW matched filters and correlators [4,6,31,34], • Tunable SAW filters [13,18,26], • Programmable filters using chirp-Z transform [27], • SAW delay lines and oscillators [11], etc.…”

Section: IImentioning

confidence: 99%

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Hashimoto

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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A brilliant super-star in the SAW community, Clinton Sylvester Hartmann passed away in Dallas, TX, on February 4, 2013, at the age of 68. This article reviews Clinton's professional career and achievements at first, and then a few stories between Clinton and me are given. The stories tell how deeply Clinton contributed to my career up and early achievements. They also show how Clinton motivated, trained, and directed one young engineer.

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Section: IImentioning

confidence: 99%

Clinton Sylvester Hartmann: His achievements and our unwritten stories

Hashimoto

2013

2013 IEEE International Ultrasonics Symposium (IUS)

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“…SAW technology needs to increase the BT of the devices to keep ahead of digital technology. Slanted transducers [1][2][3][4][5] are the key to achieving large BT devices.…”

Section: Introductionmentioning

confidence: 99%

Improved SAW Slanted Array Compressor structure for achieving > 20,000 time-bandwidth product

Dufilie¹,

Valerio²,

Martin³

2014

2014 IEEE International Ultrasonics Symposium

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Many of today's radar systems rely on digital processing for pulse compression. The future of SAW LFM pulse compression systems depends on achieving at least comparable performances to all-digital solutions.SAW-based pulse compression systems can consume less power and have higher dynamic range than all-digital systems, properties important for portable and long-range radars. The future market for SAW dispersive devices depends on development of larger timebandwidth (BT) product device structures. Currently a BT of 10,000 is achievable, with a goal of > 20,000 in a single SAW device.The SAW structure which achieves the largest %BW is the Slanted Array Compressor (SAC) on a LiNbO3 substrate. The structure consists of two slanted aperiodic transducers with balanced microstrip bus bars and refraction-correcting acoustic lenses. It may also include a metallic shield/phase correction region between the two transducers. By using a different number of strips-per-wavelength for each transducer (e.g. 3 and 4 strips/λ) it is possible to increase the spurious-free %BW to greater than 100%. This eliminates the mechanical reflections when 2 strips/λ transducers are used. The acoustic impedances are increased by using series-connected transducer channels.The new structure eliminates the refraction-correcting acoustic lenses by compensating for refraction in the transducer strip region. This approach simplifies device analysis and reduces the sensitivity of insertion loss to temperature.The metallic shield/phase correction region can also be removed by including a compensated digital exciter in the system. Measurements on a dispersive filter having a BT of 15,000 will be presented. Near-ideal performance of 1.8ns 3dB compressed pulse with 30dB close in sidelobes is achieved in a pulse compression system using a compensated digital exciter. The achieved pulse gain through the filter is close to 0dB.

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