A Tunable Metamaterial Resonator Using Varactor Diodes to Facilitate the Design of Reconfigurable Microwave Circuits

Nesimoğlu, Tayfun; Sabah, Cumalı

doi:10.1109/tcsii.2015.2503058

Cited by 45 publications

(32 citation statements)

References 28 publications

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“…The overall size of the proposed reconfigurable filter is 30 × 18 mm. The proposed work shows 56% size reduction when compared to the meta‐material based microwave device designed for the same lower operating band. The following sections describe the various states of operation.…”

Section: Evolution and Design Detailsmentioning

confidence: 95%

“…Thus, through the study of the literature it is evident that the multi‐band reconfiguration requires large device size to enable cascading, RF MEMS switches which increases the manufacturing cost, necessitates dielectric loading to tune to different frequency ranges. Switching between multi‐bands can be developed by combining the properties of a multi‐band filter and a switch . This discrete switching between the bands at the RF front end is well suited for dynamic spectrum allocation.…”

Section: Introductionmentioning

confidence: 99%

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Multi-band reconfigurable microwave filter using dual concentric resonators

Kingsly

Kanagasabai

Alsath

et al. 2018

Int J RF Microw Comput Aided Eng

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This article presents the design and testing of a novel frequency reconfigurable microwave filter. The filter structure is composed of an all stop resonator coupled with C‐ and E‐shaped parasitic resonators. PIN diodes are located at suitable positions to achieve multi‐band reconfiguration from 1.2 to 3.2 GHz making the filter suitable for multiple wireless communication systems. The frequency and bandwidth of the filter are governed by the length of the resonators and coupling between the resonators and the transmission line, respectively. A sharp rejection of −30 dB is observed between the passbands. The proposed filter offers 56% size reduction with flat group delay performance. The prototype filter is fabricated and the simulation results are validated using experimental measurements. The measurement results show good agreement with the simulation results.

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Section: Evolution and Design Detailsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Multi-band reconfigurable microwave filter using dual concentric resonators

Kingsly

Kanagasabai

Alsath

et al. 2018

Int J RF Microw Comput Aided Eng

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“…The basic geometry of the unit‐cell structure has been inspired from the S‐shaped resonator . The design of unit‐cell represented in Figure consists of S‐shape resonator in the top plane with rectangular stubs of width U 2 .…”

Section: Antenna Designmentioning

confidence: 99%

A thin‐layer dielectric and metamaterial unit‐cell stack loaded miniaturized SRR‐based antenna for triple narrow band 4G‐LTE applications

Dave¹,

Rathod²

2018

Int J RF Microw Comput Aided Eng

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This article presents the design of a miniaturized dual‐band antenna for long‐term evolution (LTE) application is presented. In the basic antenna design, split ring resonator was loaded in the radiating plane of the patch and frequency of resonance was further modified with the help of E‐shaped stub. The antenna has been fabricated using FR‐4 substrate and the measured dual bands at 2.11 and 2.665 GHz are found in a close match with the simulated data. By placing a thin dielectric resonator of permittivity ε r = 10.2 and thickness of 1.27 mm, two closely spaced narrow bands are obtained at 2.217 and 2.28 GHz. A novel metamaterial unit‐cell having near‐zero refractive index is designed and mounted above the dielectric resonator. This stack configuration generates triple narrow frequency band in the LTE 2 GHz spectrum range. The overall size of the proposed antenna is 20 × 25 mm2.

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“…In this method, active devices such as varactor diodes, PIN diodes and micro-electro-mechanical systems (MEMS) have been used to achieve reconfigurability. A varactor diode is extensively studied in the literature [13][14][15]. It is modeled as a variable capacitance and this property brings various advantages such as simple integration and bias distribution due to using only one diode to achieve the tuning.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

Esmail¹,

Majid²,

Abidin³

et al. 2017

IJECE

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In this paper, reconfigurable metamaterial structure at millimeter wave frequency range was designed and simulated for a future fifth generation (5G) mobile-phone beam switching applications. The new proposed structure was composed of a bridge-shaped resonator (BSR) in the front face and strip line at the back face of the unit cell which operates at 28GHz. First, nonreconfigurable low loss BSR unit cell was designed and subsequently, the reconfigurability was achieved using four switches formed in the gaps of the structure. The proposed structure achieves the lowest loss and almost full transmission among its counterparts by -0.06dB (0.99 in linear scale). To demonstrate the reconfigurability of the metamaterial, the reflection and transmission coefficients and real parts of the effective refractive index at each reconfigured frequency were studied and investigated. Simulation results showed that a high transmission and reflection peaks occur at each resonance frequency according to change the state of the switches. [6]. The study of the negative index metamaterials has been enhanced through various strategies and processes. However, few issues have been encountered such as the narrow bandwidths and losses that limit the spectrum and the range of their applications. Metamaterials suffer from high losses when the frequency is pushed to the higher range such as millimeter wave (MMW) bands [7]. However, the losses are very low and the unusual electromagnetic properties of the metamaterials can still be achieved within the microwave frequency region. The losses can give negative influences and adverse effects toward the realizations of the unique electromagnetic properties of the metamaterials. Throughout the years, the researchers had been proposed various technique to reduce such losses. Keyword: 5GA number of diverse techniques are extensively reported in the literature to compensate the metamaterials losses at microwave and terahertz such as tailoring geometry of metamaterial unit cell [8], using the electromagnetically induced transparency (EIT) at low frequency range [9], integrate an active

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A Tunable Metamaterial Resonator Using Varactor Diodes to Facilitate the Design of Reconfigurable Microwave Circuits

Cited by 45 publications

References 28 publications

Multi-band reconfigurable microwave filter using dual concentric resonators

Multi-band reconfigurable microwave filter using dual concentric resonators

A thin‐layer dielectric and metamaterial unit‐cell stack loaded miniaturized SRR‐based antenna for triple narrow band 4G‐LTE applications

Reconfigurable Metamaterial Structure at Millimeter Wave Frequency Range

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