Techniques for Tuning BAW-SMR Resonators for the 4th Generation of Mobile Communications

Hassan, Moustapha El; Kerhervé, Eric; Deval, Yann; Baraka, J.B. David K.; Belot, Didier

doi:10.5772/55131

Cited by 6 publications

(1 citation statement)

References 12 publications

(23 reference statements)

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“…The matching inductor L 11 shown in Figure 1b is employed to replace the parallel AWR of the AW filter as shown in Figure 1d to beak the bandwidth constraint of the ladder structure. The inductor L p and AWR in parallel constitute an AWLR module to further enhance the bandwidth [9]. The function of inductors L 22 and L s shown in Figure 1c is similar to that of L 11 and L p to enhance the bandwidth.…”

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A novel enlarging fractional bandwidth technique for acoustic‐wave‐lumped‐element resonator‐based bandpass filters

Tang,

Jia

2024

Electronics Letters

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A novel enlarging fractional bandwidth (FBW) technique for acoustic‐wave‐lumped‐element resonator (AWLR)‐based bandpass filters is presented. The new technique is based on a series of matching inductors that replace the parallel or series acoustic wave (AW) resonators of AW filters to beak the bandwidth constraint of the ladder‐type structure. In addition, the transmission response analysis of the proposed AWLR‐based filter is provided. A prototype of the AWLR‐based filter is fabricated and tested to validate the proposed FBW widening technique. The measured insertion loss, FBW, and out‐of‐band rejection are 1.5 dB, 1.63kt2 (kt2 is the electromechanical coupling coefficient of the AWR), and 38 dB, respectively.

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confidence: 99%

A novel enlarging fractional bandwidth technique for acoustic‐wave‐lumped‐element resonator‐based bandpass filters

Tang,

Jia

2024

Electronics Letters

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A methodology for enhancing bandwidth with keeping steepness of the ladder filters exploiting acoustic‐wave‐lumped‐element resonators

Tang,

Jia,

Zhang

et al. 2024

Micro & Optical Tech Letters

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A methodology to acquire a wide bandwidth and steep transition of a hybrid ladder filter with the acoustic‐wave‐lumped‐element‐resonators (AWLRs) structure is proposed. Different from previous works, a unit of the new AWLR structure with two lumped elements respectively in series and shunt is proposed. It can change both the series‐resonant frequency and the parallel‐resonant frequency of the acoustic wave (AW) resonator to enhance the bandwidth of the hybrid ladder filter. For the ladder structure, all the AW resonators possess the same resonant frequency and impedance. This ladder structure is also used to keep the steep transition of the hybrid filter. For the validations, two‐stage and four‐stage AWLRs‐based hybrid filters are designed, manufactured, and tested. They include (1) a two‐stage filter with an insertion loss (IL) of 0.9 dB, a fractional bandwidth (FBW) of 1.90kt2 (kt2 is the electromechanical coupling coefficient), a center frequency of 1249.3 MHz, and (2) a four‐stage filter with the IL of 1.3 dB, the FBW of 1.86kt2, the SF30 dB/3 dB (shape factor defined as 30‐dB bandwidth divided by 3‐dB bandwidth) of 2.52, the figure of merit (defined as FBW divided by SF30 dB/3 dB) is 0.74kt2 which is the best result, a center frequency of 1249.4 MHz.

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Analysis of spurious peaks at series resonance in solidly mounted resonators by combined BVD-Mason modelling

et al. 2023

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Techniques for Tuning BAW-SMR Resonators for the 4th Generation of Mobile Communications

Cited by 6 publications

References 12 publications

A novel enlarging fractional bandwidth technique for acoustic‐wave‐lumped‐element resonator‐based bandpass filters

A novel enlarging fractional bandwidth technique for acoustic‐wave‐lumped‐element resonator‐based bandpass filters

A methodology for enhancing bandwidth with keeping steepness of the ladder filters exploiting acoustic‐wave‐lumped‐element resonators

Analysis of spurious peaks at series resonance in solidly mounted resonators by combined BVD-Mason modelling

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