A Reconfigurable Pseudohairpin Filter Based on MEMS Switches

Donelli, Massimo; Manekiya, Mohammedhusen; Tagliapietra, Girolamo; Iannacci, Jacopo

doi:10.3390/s22249644

Cited by 4 publications

(2 citation statements)

References 52 publications

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“…This solution allows for a designer to use the U-elements in the well-established coupled-line filters designed in a microstrip configuration, substituting straight lines with bent ones. Preliminary work on filters implemented by RF MEMS switches was performed in [33]. The hairpin filter is a well-known example of using U-bended lines [34,35].…”

Section: U-shaped Resonatorsmentioning

confidence: 99%

MEMS-Switched Triangular and U-Shaped Band-Stop Resonators for K-Band Operation

Marcelli,

Sardi,

Proietti

et al. 2023

Sensors

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Triangular resonators re-shaped into Sierpinski geometry and U-shaped resonators were designed, linking them with single-pole-double-through (SPDT) RF MEMS switches to provide frequency tuning for potential applications in the K-Band. Prototypes of band-stop narrowband filters working around 20 GHz and 26 GHz, interesting for RADAR and satellite communications, were studied in a coplanar waveguide (CPW) configuration, and the tuning was obtained by switching between two paths of the devices loaded with different resonators. As a result, dual-band operation or fine-tuning could be obtained depending on the choice of the resonator, acting as a building block. The studied filters belong to the more general group of devices inspired by a metamaterial design.

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Section: U-shaped Resonatorsmentioning

confidence: 99%

MEMS-Switched Triangular and U-Shaped Band-Stop Resonators for K-Band Operation

Marcelli,

Sardi,

Proietti

et al. 2023

Sensors

Self Cite

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“…To avoid the above filtering switch problems and to fill knowledge gaps in the related fields, in this paper, we combine an improved filter response theory of coupled microstrip lines [13] with the basic design techniques of filtering switches [14][15][16]. We also studied related research in similar fields, such as MEMS switch-based filters [17], ferrite resonant filters [18], and enhanced gain in waveguide antennas [19]. Based on these theoretical approaches, we propose a filtering switch designed according to the filtering effect of coupled microstrip lines.…”

Section: Introductionmentioning

confidence: 99%

A Filtering Switch Made by an Improved Coupled Microstrip Line

Fan

Chen

et al. 2023

Applied Sciences

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In this paper, we propose a new filtering switch with excellent working performance made using an optimized coupled microstrip line. Upon analyzing the RF (radio frequency) front-end’s system structure, the switching device was simplified to a diode, which was connected to the microstrip circuit we designed to become a filter switch with both filtering and shutdown functions. First, we obtained an equivalent schematic of this filtering switch based on the relevant microstrip line theory. This switch consists of two coupled microstrip circuits, parallel-coupled feed lines and coupled-line stub-load resonators (CLSs), and a PIN diode. Second, the operating principle is described by the switching of the operating states, with ideal shutdown performance in the off state and considerable selectivity and excellent out-of-band rejection performance in the filtered state. Finally, a prototype filtering switch with a center frequency of 0.8 GHz was designed and tested. After subsequent optimization and improvement, the simulation and test performance results were noticeably consistent, consequently verifying the performance requirements of this filtering switch in two operating states in the center frequency band.

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Design of high performances electronically reconfigurable antenna arrays by means of parasitic structures and RF-MEMS switches

Donelli,

Tagliapietra,

Guha

et al. 2024

Microsyst Technol

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This work explores the development of smart array antennas, able to electronically change their beam patterns through reconfigurable linear, planar, or conformal parasitic structures controlled by mean of a set of electronic switches namely the radio frequency micro-electromechanical switches (RF-MEMS). The motivation of this study is to extend and make competitive the use of reconfigurable antenna arrays in areas such as the Internet of Things (IoT) and wireless sensor networks. These hot research areas require a capillary distribution of sensors characterized by compact dimensions and limited cost. The radiating systems play a key role in such applications since the improvement of the radiating properties can dramatically reduce the power consumption of such sensors and extend their operative range. Standard smart antenna arrays such as phased, or fully adaptive arrays are extremely expensive, expensive and difficult to control. In this work, the use of smart reconfigurable antenna arrays that do not require expensive digital variable phase shifters and attenuators has been considered. The proposed antenna structures are based on reconfigurable parasitic structures, that thanks to suitable RF-MEMs switches are able to obtain a desired beam pattern, by steering the main beam in a given direction, removing eventually interfering signals and maximizing the signal-to-noise ratio SNR. The versatility, simplicity, and low cost of such antennas make them particularly suitable for the emergent wireless sensor networks and IoT applications. Theoretical background, design guidelines, and suggestions for their fabrication are detailed in this work. Some antenna models for different practical applications are designed, optimized, numerically assessed with commercial electromagnetic simulators, and commented to provide a valid alternative to researchers involved in antenna design for IoT applications.

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A Reconfigurable Pseudohairpin Filter Based on MEMS Switches

Cited by 4 publications

References 52 publications

MEMS-Switched Triangular and U-Shaped Band-Stop Resonators for K-Band Operation

MEMS-Switched Triangular and U-Shaped Band-Stop Resonators for K-Band Operation

A Filtering Switch Made by an Improved Coupled Microstrip Line

Design of high performances electronically reconfigurable antenna arrays by means of parasitic structures and RF-MEMS switches

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