A novel MEMS tunable antenna with wide tuning range of frequency

Mahmoodnia, Hedieh; Ganji, Bahram Azizollah

doi:10.1007/s00542-014-2162-3

Cited by 10 publications

(3 citation statements)

References 8 publications

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“…Tunable Radio Frequency (RF) capacitors play a crucial role in wireless communication systems such as filters, Voltage-Controlled Oscillators (VCOs), phase shifters (Afrang and Nematkhah 2019), and antennas (Mahmoodnia and Ganji 2015). The emergence of 5G systems has necessitated the development of the tunable capacitors capable of operating at higher frequencies (Aziz et al 2020).…”

Section: Introductionmentioning

confidence: 99%

A New Electrostatic Tunable Capacitor For Wide Ranges Of Applications

Razaghpour,

Ghasemi,

Fathi

2024

Preprint

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A new electrostatically tunable capacitor for wide range of frequencies is proposed in this paper. A complete design rule is proposed to design a variable capacitor in the range of 0.01 pF – 2.05 pF due the its application. The designed capacitor occupies 0.03 mm 2 – 1.12 mm 2 space based on the required capacitance value which is so small comparing the related published works. The floating technique is used to get the high-quality factor. The quality factor of the proposed capacitor is in the range of 45 to 100 over the frequency range of 1.28G to 2.78GHz, and also the tunability range of the tunable capacitor is 374%. After presenting a complete design rule with the related equations, the proposed capacitor is used in an amplifier circuit with a spiral inductor and the performance of the proposed capacitor is evaluated and compared with other capacitors. The COMSOL Multiphysics is used for simulation.

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Section: Introductionmentioning

confidence: 99%

A New Electrostatic Tunable Capacitor For Wide Ranges Of Applications

Razaghpour,

Ghasemi,

Fathi

2024

Preprint

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“…Radio frequency micro electromechanical system (RF MEMS) devices have been used in telecommunication equipment such as RF MEMS capacitors and switches [1][2][3], phase shifters and filters [4,5] and antennas [6]. The use of MEMS technology has been considered due to low losses, high linearity, low area, compatibility with other technologies and the ability to use at high frequencies [7].…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of a variable MEMS capacitor for tunable HMSIW resonator

Saberhosseini

Ganji

Koohsorkhi

et al. 2020

IET Circuits, Devices & Systems

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Here, a new design of a variable micro electromechanical system (MEMS) capacitor is introduced to use in telecommunication systems. For the first time, an on-chip MEMS component has been used in the substrate integrated waveguide (SIW) structures to avoid discrete and non-integrated connection problems and high noise levels and affects the operating frequency of telecommunication systems. The behaviour of two capacitors with the fixed-fixed and supported membrane by special spiral arms is analysed and simulated using the finite element method. The MEMS bridges are implemented by a 6 μm gold layer and an air gap of 3 μm. It can be seen that using the new special arms, the movement of the membrane is more uniform than the clamped while the actuation voltage is up to 1.32 V and the tuning range of the capacitor is 29%. Then both the capacitors are placed on half-mode SIW structure and the electromagnetic simulation is done. Finally, the results comparison shows that the frequency tuning range of the MEMS variable capacitor is more significant than the other.

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“…Introduction: Radiofrequency (RF) microelectromechanical system (MEMS) switches have advantages of high isolation, quality factor, minimum loss and low power consumption with respect to other technology such as solid-state technology. Therefore, they have been used in many applications like phase shifter, antenna, filter and resonator recently [1][2][3]. However, there is a limitation to use this technology in the high-speed systems such as micro/millimetre-wave radar and phased array antenna due to their low switching speed about microsecond [4].…”

mentioning

confidence: 99%

Model improvement of the miniature switched capacitor for high‐speed applications

Razeghi-Harikandeei

Ganji

Koohsorkhi

et al. 2020

Micro & Nano Letters

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In this work, it is shown that the spring constant model for rectangular fixed-fixed beam used in the literature for high-speed applications is not correct and the model is improved for all fixed-fixed beams with a desired symmetrical shape. The new model is used to calculate the resonance frequency of the fabricated high-speed-specific 3D bridge named boat-like shape beam existing in the literature. The comparison shows that the model result is in good agreement with the simulation and measurement results. Also, the concept of the miniature microelectromechanical systems switched capacitors will be explained and it is shown that the rectangular beam with a simple fabrication process can be designed to achieve high speed about 150 ns like a boat-like shape beam which needs to two specific lithography processes that are so involved.

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A novel MEMS tunable antenna with wide tuning range of frequency

Cited by 10 publications

References 8 publications

A New Electrostatic Tunable Capacitor For Wide Ranges Of Applications

A New Electrostatic Tunable Capacitor For Wide Ranges Of Applications

Design and simulation of a variable MEMS capacitor for tunable HMSIW resonator

Model improvement of the miniature switched capacitor for high‐speed applications

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