High performance microwave acoustic components for mobile radios

Pitschi, F.M.; Kiwitt, J.E.; Koch, Robert de Mello; Bader, B.; Wagner, K.; Weigel, Robert

doi:10.1109/ultsym.2009.5441550

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…The importance of AW resonators has grown due to their essential performance requirements for analog filters: low insertion loss, small size, and excellent selectivity. Synthesizing AW filters using AW resonators has been achieved through several methods [1][2][3][4][5]. Typically, in ladder-type AW filters [6][7][8][9][10][11], the resonant frequency of the series resonator and the antiresonant frequency of the parallel resonator are adjusted to align with the desired bandwidth's center frequency.…”

Section: Introductionmentioning

confidence: 99%

Analyzing Three Types of Design Methods for 5G N41 Band Acoustic Wave Filters

Jang,

Ahn

2024

International Journal of RF and Microwave Computer-Aided Engine

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This paper presents three design methods for acoustic wave (AW) filters: the direct conversion design method, the slope parameter method, and the band edge fitting method (BEFM). Since the conventional BVD model consists only of lumped elements and has accuracy only near the resonance frequency, an NM-BVD model capable of broadband modeling is proposed in this paper and used to design the filter. In the proposed BEFM, a systematically optimal filter method is used to design the AW filter, and each AW resonator is tuned to the filter prototype value to meet the desired specifications. Thus, the filter design time and the number of resonators can be efficiently improved, and the filter design time can be reduced compared with the direct conversion and slope parameter methods commonly used in filter design. To demonstrate the effectiveness of these design methods, the proposed methods were used to design and fabricate an N41 filter using scandium-doped aluminum nitride (ScAlN) resonators. The broadband capabilities of the filter were verified using BEFM. The design, fabrication, and measurement of a broadband filter that meets the requirements of the 5G N41 frequency band centered at 2.593 GHz with a bandwidth of 196 MHz have verified the filter fabricated using the proposed design method. The insertion loss is less than -3 dB in the target band and more than 30 dB out of band. In summary, the proposed BEFM provides an efficient and accurate method for designing AW filters.

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Section: Introductionmentioning

confidence: 99%

Analyzing Three Types of Design Methods for 5G N41 Band Acoustic Wave Filters

Jang,

Ahn

2024

International Journal of RF and Microwave Computer-Aided Engine

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“…To realize the inter-band CA, the filter module of the front-end system needs to provide channel paths with high selectivity and isolation. In particular, acoustic wave (AW) devices with a compact size and high-quality factors are more suitable for designing filter modules than transmission line elements in sub-6 GHz bands [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Design for Acoustic Wave Multiplexers With Single Inductor Matching Network Using Frequency Response Fitting Method

Tseng

Yang

Hsiao³

et al. 2022

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

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This study proposes a new acoustic wave (AW) multiplexer topology with a single-inductor matching network for carrier aggregation (CA) in the fifth-generation communication systems. To satisfy the desired specifications of all the multiplexer ports based on ladder-type filters, the frequency response fitting method (FRFM) is proposed to obtain the BVD parameters for each AW resonator. Using the proposed computer-aided method, a parameter solution can be obtained under practical design limitations, such as the selection of the piezoelectric material, properties of the manufacturing process, and used circuit topology. Furthermore, a measurement of a band 1 and 3 surface acoustic wave (SAW) multiplexer is set up to confirm the feasibility of the proposed FRFM. The designed SAW multiplexer based on the lithium tantalate with Euler angle (0, −38, 0), 42 ｏ YX-LiTaO3, is arranged. The designed quadplexer achieves high selectively with a return loss (RL), stopband reflection, and isolation better than −12 dB, −43 dB, and −50 dB, respectively, in a 2.15 × 2.65 mm 2 occupation. The measurement results confirm the feasibility of the multiplexer topology and the proposed FRFM. The approach is also extended to a quadplexer design with band 4 and 25 and a hexaplexer design with band 1, 3, and 7 for CA applications, demonstrating its flexibility and simplicity.INDEX TERMS acoustic wave components, filter synthesis, MEMS, microwave components, microwave filters, multiplexers, optimization methods, SAW devices.

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“…In general, there are two main RF surface acoustic wave (SAW) filter configurations according to the connection type for mobile phone applications, namely, ladder-type and double-mode SAW (DMS) filters. (1)(2)(3)(4)(5)(6)(7)(8)(9) The ladder-type filter, which consists of several resonators cascaded in series and parallel, is more commonly applied to an RF front-end filter because of its high selectivity. (2,5,6,9) With the growth of the 4th generation of mobile wireless broadband communication transmission technology [4G, long term evolution (LTE)], the latest-generation smartphones are expected to support most of the frequency bands and require more filters in a device.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ladder-type Radio Frequency Surface Acoustic Wave Filter Based on Lumped Circuit Model by Using Neural Network

Chung¹,

Huang²,

Hwang³

et al. 2019

Sensors and Materials

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With the development of mobile communication technology, the demand for mobile devices continues to rise. Acoustic devices such as radio frequency (RF) filters and duplexers are widely used in mobile handsets because of their excellent electric performance characteristics. However, the key bottleneck is how to convert a lumped circuit model into the structure parameters of an acoustic resonator for RF circuit designers so that they can apply RF circuit design tools in designing surface acoustic wave (SAW) devices. The neural network (NN) has been widely applied in various science and management areas for its powerful learning and mapping capabilities. In this paper, a method of building a bridge between the lumped equivalent circuit (EC) model and structure parameters of a SAW resonator is proposed. The approach begins with establishing a database that shows the relationship between the values of the lumped EC and corresponding structure parameters of the SAW resonator. A four-layered NN with the back-propagation (BP) algorithm is adopted to determine the relationship between the structure parameters of the SAW resonator and the lumped EC. Then, other input/output pairs are presented to check if the estimated lumped EC matched with original circuit. Finally, as an example, the design of a long term evolution (LTE) transmitter (Tx) filter is developed to demonstrate the proposed approach.

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High performance microwave acoustic components for mobile radios

Cited by 10 publications

References 20 publications

Analyzing Three Types of Design Methods for 5G N41 Band Acoustic Wave Filters

Analyzing Three Types of Design Methods for 5G N41 Band Acoustic Wave Filters

Design for Acoustic Wave Multiplexers With Single Inductor Matching Network Using Frequency Response Fitting Method

Synthesis of Ladder-type Radio Frequency Surface Acoustic Wave Filter Based on Lumped Circuit Model by Using Neural Network

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