Spurious suppression technique for edge-trap-type SAW resonators and their application to 1-GHz wide-band SAW-VCOs for mobile communications

Kachi, Tsuyoshi; Isobe, Aki; Sumioka, A.; Asai, K.; Hikita, M.

doi:10.1109/mwsym.2001.966906

Cited by 1 publication

(1 citation statement)

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“…It has been reported that the spurious response can be suppressed by controlling the phase of the electrode fingers [12]. In this paper, a method is presented for elimination of the spurious response from the oscillation bandwidth by increasing the electrode film thickness in such a way that the spurious response is shifted to a lower frequency.…”

Section: Saw Resonator With Spurious Response Eliminatedmentioning

confidence: 99%

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Isobe

Hikita

Asai

2005

Electron Comm Jpn Pt II

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SUMMARYA Love-wave SAW propagating on a thick Al grating on a LiNbO 3 piezoelectric substrate exhibits a resonant characteristic with an extremely small capacitance ratio γ (= 3.0) while it elastically couples with Rayleigh waves in a complex manner. In the application to a resonator, the Rayleigh wave becomes spurious and must be suppressed sufficiently. With a view to development of a broadband SAW resonator for a VCO, the propagation/reflection characteristics of this Love-wave/Rayleigh-wave configuration are analyzed. The following results are found by simulation and experiments. (1) Both the Love wave and Rayleigh wave have extremely wide reflection bandwidths. (2) Two types of spurious Rayleigh wave appear in the resonant characteristics. (3) The stopband of the Rayleigh wave is superior in reflection characteristic to the Love wave. It is also demonstrated experimentally that a broadband SAW-VCO can be realized if the VCO oscillation frequency is chosen within the Rayleigh wave stopband after the Al film thickness is optimized.

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Section: Saw Resonator With Spurious Response Eliminatedmentioning

confidence: 99%