Theory and Design of the Surface Acoustic Wave Multistrip Coupler

Marshall, F.G.; Newton, C.O.; Paige, E.G.S.

doi:10.1109/t-su.1973.29733

Cited by 20 publications

(9 citation statements)

References 15 publications

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“…The demonstrated broadband ADLs are enabled due to the enhanced IL-FBW design space of the SH0 mode and the clean spectrum collectively. It is also feasible to further mitigate the spurious modes by the tracker changer designs using multistrip couplers [51].…”

Section: Toward Broadband Acoustic Delay Linesmentioning

confidence: 99%

GHz Broadband SH0 Mode Lithium Niobate Acoustic Delay Lines

Yang

et al. 2020

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

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We present the first group of GHz broadband SH0 mode acoustic delay lines (ADLs). The implemented ADLs adopt unidirectional transducer designs in a suspended X-cut lithium niobate thin film. The design space of the SH0 mode ADLs at GHz is first theoretically investigated, showing that the large coupling and sufficient spectral clearance to adjacent modes collectively enable the broadband performance of SH0 delay lines. The fabricated devices show 3-dB fractional bandwidth ranging from 4% to 34.3% insertion loss between 3.4 and 11.3 dB. Multiple delay lines have been demonstrated with center frequencies from 0.7 to 1.2 GHz, showing great frequency scalability. The propagation characteristics of SH0 in lithium niobate thin film are experimentally extracted. The demonstrated ADLs can potentially facilitate broadband signal processing applications.

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Section: Toward Broadband Acoustic Delay Linesmentioning

confidence: 99%

GHz Broadband SH0 Mode Lithium Niobate Acoustic Delay Lines

Yang

et al. 2020

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

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“…The performance of multistrips can be quantitatively investigated using the coupled-mode theory [7], [13]. For a perfectly symmetrical structure (see Fig.…”

Section: B Msc Theorymentioning

confidence: 99%

“…Conventionally, RF couplers are based on EM wave interference in coupled transmission lines [57], [58], waveguides [59], or discrete elements [60], of which the sizes are substantial for portable systems. The established acoustic counterparts for EM couplers, namely SAW-based multistrip couplers (MSCs) that employ patterned metallic strips on piezoelectric substrates [61], provide more design flexibilities [12], [13], [62] and drastically smaller sizes. However, three bottlenecks hinder the applications of SAW MSCs.…”

Section: Introductionmentioning

confidence: 99%

GHz Low-Loss Acoustic RF Couplers in Lithium Niobate Thin Film

Yang

et al. 2020

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

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We present the first group of GHz low-loss acoustic radio frequency (RF) couplers using the fundamental symmetric (S0) mode in X-cut lithium niobate thin films. The demonstrated multistrip couplers (MSCs) significantly surpass the insertion loss (IL) and the operating frequency of the previous works in more compact structures, thanks to the large electromechanical coupling and low loss of S0 in lithium niobate. The design space of S0 MSCs is first explored. Devices with different coupling factors are fabricated using different numbers of strips. Based on the S0 testbed with an IL of 4.5 dB at 1 GHz, the hybrid coupler shows an IL of 7.5 dB, while the track changer shows an IL of 5.1 dB, over a 3-dB fractional bandwidth of 8%. Couplers at different frequencies (between 0.75 and 1.55 GHz) are also investigated. Upon further optimizations, the S0 MSC platform can potentially enable low-loss wideband signal processing functions toward an RF acoustic component kit.

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“…I n addition, a variety of window functions can be applied to optimize passband response, including those of the Hamming, Blackman, or Kaiser-Bessel-type [97], [98]. Some CAD programs may also be specifically applied to Withdrawal-weighted lOTs [99] with sidelobe suppression of up to about 70 dB in narrow-band filters (BW < "" 1 percent) [100]- [102], where the use of a multi strip coupler (MSC) [103], [104] is undesirable.…”

Section: F Computer-aided Modelingmentioning

confidence: 99%

“…These include one or more penalties in fabricational complexity, device size, matching networks, bandwidth, passband ripple, and sidelobe sidelobe suppression. Apart from the resonatorfilters considered above, various other low-loss SAW filter designs include those with multistrip couplers [103], [104], three-phase lOTs [153], group-type lOTs [154], and interdigitated lOTs [95], [155].…”

Section: A Low-loss Sa W-filter Typesmentioning

confidence: 99%

Applications of surface acoustic and shallow bulk acoustic wave devices

Campbell

1989

Proc. IEEE

111

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Applications of surface acoustic wave (SA W) and shallow bulk acoustic wave (SBA W) devices are reviewed. SA W-device coverage includes delay lines and filters operating at selected frequencies in the range from about 10 MHz to 11 GHz, modeling with singlecrystal piezoelectrics and layered structures, resonators and lowloss filters, comb filters and multiplexers, antenna duplexers, harmonic devices, chirp filters for pulse compression, coding with fixed and programmable transversal filters, Barker and quadraphase coding, adaptive filters, acoustic and acoustoelectric convolvers and correia tors for radar, spread spectrum, and packet radio, acoustooptic processors for Bragg modulation and spectrum analysis, real-time Fourier-transform, and cepstrum processors for radar and sonar, compressive receivers, Nyquist filters for microwave digital radio, clock-recovery filters for optical fiber communications, fixed-, tunable-, and multimode-oscillators, and frequency synthesizers, acoustic charge transport (ACT), and other SA W devices for signal processing on gallium arsenide, SA W sensors, and scanning acoustic microscopy. SBA W-devices applications include gigahertz delay lines, surface transverse wave resonators employing energy-trapping gratings, as well as oscillators with enhanced performance and capability.

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Theory and Design of the Surface Acoustic Wave Multistrip Coupler

Cited by 20 publications

References 15 publications

GHz Broadband SH0 Mode Lithium Niobate Acoustic Delay Lines

GHz Broadband SH0 Mode Lithium Niobate Acoustic Delay Lines

GHz Low-Loss Acoustic RF Couplers in Lithium Niobate Thin Film

Applications of surface acoustic and shallow bulk acoustic wave devices

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