A Switchless Quad Band Filter Bank Based on Ferroelectric BST FBARs

Nam, Suhyun; Koohi, Milad Zolfagharloo; Peng, Wenhao; Mortazawi, Amir

doi:10.1109/lmwc.2021.3069880

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…BAW resonators based on ferroelectric BST exhibit several interesting features, allowing potential simplification of RF frontends. Due to BST's strong electrostriction properties, BST resonators can be switched on and off with the application of a DC bias voltage [91], [92], [93], [94], [95], [96], [97], [98], [99], [100], [101], [102], [103], [104], [105]. A photograph of an intrinsically switchable BST FBAR is shown in Fig.…”

Section: Tunable and Reconfigurable Acousticsmentioning

confidence: 99%

“…Application of intrinsically switchable resonators in design of a quad band intrinsically switchable filter bank has been demonstrated [105], where four parallel filters based on BST FBARs, operating across neighbouring frequency bands are fabricated. Each filter can be switched on or off by applying DC voltage at their respective nodes (see Fig.…”

Section: Tunable and Reconfigurable Acousticsmentioning

confidence: 99%

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From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

et al. 2023

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This paper reviews the latest developments in microwave acoustic wave devices. After an introduction and brief history of bulk acoustic wave (BAW) and surface acoustic wave (SAW) devices, a review is given for guided SAWs and XBARs -two new technologies, which are promising for future 5G applications. Following this, we discuss recent simulation techniques, such as 3D finite element method (3D FEM) and simulation of nonlinearities, as well as filter synthesis. Next, a review on tunable and reconfigurable acoustics is given. Finally, we present the latest developments in microwave acoustics for millimeter-wave (mm-wave) operation as well as BAW oscillators.INDEX TERMS Bulk acoustic wave (BAW) devices, filter, filter-synthesis, front-end, high power, MTT 70th Anniversary Special Issue, multiplexer, nonlinearity, resonator, surface acoustic wave (SAW) devices.

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Section: Tunable and Reconfigurable Acousticsmentioning

confidence: 99%

Section: Tunable and Reconfigurable Acousticsmentioning

confidence: 99%

From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

et al. 2023

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“…However, in order to meet previously unheard-of needs and new applications, microwave filters now have to meet new and interesting difficulties in terms of efficiency, bandwidth requirements, compactness, power consumption, reconfigurability, and cost [5,6]. Specifically, filtering technology continues to prioritise adapting to various settings while maintaining high performance standards, compact size, and low cost [7][8][9]. Planar microstrip filters are the chosen option because of their low cost and simple fabrication procedures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of A Semi-Circular Cavity BPF with RF-MEMS Switches for 5G Applications and X-band Satellite Communication applications

Velagaleti,

Siddaiah

2024

Preprint

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This study designs and analyses a compact dual-band reconfigurable semi-circular cavity BPF. RF-MEMS switches were proposed on both sides of the 50Ω microstrip transmission lines in order to achieve reconfigurability. An electrostatically actuated shunt capacitive shunt type RF-MEMS switch is designed and tunability of the BPF is attained when the two switches move from upstate to downstate. The actuation voltage to move the switch downwards is 6.5V and the switch operates at a transition time of 30µS with a capacitance ratio of 10. Return loss of -22dB is obtained at 3.7GHz when the switch is in OFF state and return loss of -32dB is obtained at 6.7GHz when the switch is in ON state and is applicable for n77, n78 and n79 5G wireless communication applications and X-band satellite communication applications. Bandpass filter provides a frequency shift of 3GHz when both the switches are in ON state (or) OFF state. Return loss of -22dB is obtained at 3.7GHz when the switch is in the OFF state, while return loss of -32dB is obtained at 6.7GHz when the switch is in the ON state. This is suitable for 5G wireless communication applications (n77, n78, and n79) as well as X-band satellite communication applications. A 3GHz frequency shift is provided by a bandpass filter when both switches are in the ON or OFF position. BPF is designed to operate at a frequency range of 1–10 GHz that can be adjusted for different applications. By simulating the switch design in a COMSOL Multiphysics the features of the switch were examined, and the results were compared with theoretical calculations. The HFSSV.13 tool has been used to observe and present the BPF's tunable properties.

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“…However, the new requirements of microwave filters, in terms of efficiency, bandwidth requirements, compactness, power consumption, reconfigurability, and cost, are meeting new exciting challenges in realizing unprecedented demands and new applications [5,6]. In particular, filtering technology is still focusing on reconfiguring itself to different scenarios keeping high-performance requirements, smaller size, and a lower cost [7][8][9]. Due to the low cost and easy fabrication techniques, planar microstrip filters are preferred.…”

Section: Introductionmentioning

confidence: 99%

A Reconfigurable Pseudohairpin Filter Based on MEMS Switches

Donelli

Manekiya

Tagliapietra

et al. 2022

Sensors

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This work presents a bandpass-reconfigurable planar pseudohairpin filter based on RF-MEMS switches. Hairpin-line structures are preferred to design microstrip filters because this class of filters offers a more compact size, and, in general, hairpin filters do not need ground connections for resonators. In this work, the U-shape resonators are arranged to obtain an interdigit capacitor to improve the coupling between the resonators. RF-MEMS switches modify the lengths of coupled resonators by adding microstrip segments to control the filter bandwidth, moving the center frequency and the return loss. An experimental hairpin tunable filter prototype based on RF-MEMS has been designed, fabricated, numerically and experimentally assessed, and compared concerning its tunability, quality factor, and capability with standard tunable filters based on PIN diodes. In conclusion, the tunable hairpin filter based on RF-MEMS switches offers the best performance in center frequency tuning range, compactness, and power consumption regarding reconfigurable filters based on standard PIN diodes switches. The obtained results are appealing and demonstrate the capabilities and potentialities of RF-MEMS to operate with the new communication standards that work at high microwave frequency bands.

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A Switchless Quad Band Filter Bank Based on Ferroelectric BST FBARs

Cited by 9 publications

References 14 publications

From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

From Microwave Acoustic Filters to Millimeter-Wave Operation and New Applications

Analysis of A Semi-Circular Cavity BPF with RF-MEMS Switches for 5G Applications and X-band Satellite Communication applications

A Reconfigurable Pseudohairpin Filter Based on MEMS Switches

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