A Controllable Bandwidth Filter Using Varactor-Loaded Metamaterial-Inspired Transmission Lines

Borja, Alejandro L.; Carbonell, J.; Martínez, J.D.; Boria, Vicente E.; Lippens, D.

doi:10.1109/lawp.2012.2183111

Cited by 17 publications

(8 citation statements)

References 13 publications

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“…In recent years, a great effort has been devoted to the design of agile filters with tunable central frequencies [1]- [5] or bandwidth [6]- [11], as well as filters with the ability to switch their operating mode e.g. between bandpass and bandstop [12]- [14].…”

Section: Background Literature Reviewmentioning

confidence: 99%

Programmable Multifunctional RF/Microwave Circuit for Antenna and Filter Operation

Borja¹,

Kabiri

Belenguer³

et al. 2018

IEEE Trans. Antennas Propagat.

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This paper describes a multi-functional microwave device that can be reconfigured to behave either as a filter or an antenna. The device is based around a single resonant element, referred to as a building block element that is connected to 4 ports. The resonant element is a microstrip square patch working in the 2.45 GHz unlicensed Industrial Scientific and Medical (ISM) band used for IEEE 802.11 WiFi. The proposed building block is simple in its design and construction. The paper also presents devices composed of three building blocks, which can realize more complex filtering and antenna mode performance. In addition, PIN diodes have also been incorporated into the devices in order to facilitate electronic control. Measured results, pertaining to fabricated prototypes, show that filter and antenna operation can be achieved, in the same device at a frequency of around 2.45 GHz with acceptable insertion loss and efficiency. In the future, it is anticipated that this could lead to a new paradigm, namely a device that is analogous to a field programmable gate array (FPGA) operating in the microwave frequency regime.

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Section: Background Literature Reviewmentioning

confidence: 99%

Programmable Multifunctional RF/Microwave Circuit for Antenna and Filter Operation

Borja¹,

Kabiri

Belenguer³

et al. 2018

IEEE Trans. Antennas Propagat.

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“…In addition to the capability of accomplishing wide tuning range, the varactor diodes offer additional benefits, since they are tunable, low cost and can be easily connected or integrated with other components in planar technology. Thus, several varactor tuned BPF have been reported [12][13][14][15]. However, most of the modern wireless systems, and in particular the smart phones require a device that operates over multiple systems such as GSM1800MHz, UMTS2200MHz and WLAN2400MHz, in which none of the devices in [12][13][14][15] meet this goal.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, several varactor tuned BPF have been reported [12][13][14][15]. However, most of the modern wireless systems, and in particular the smart phones require a device that operates over multiple systems such as GSM1800MHz, UMTS2200MHz and WLAN2400MHz, in which none of the devices in [12][13][14][15] meet this goal. Therefore, this paper proposes a small bandpass filter with continuous wide tuning pass band response from 2.4GHz down to 1.8GHz.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this paper proposes a small bandpass filter with continuous wide tuning pass band response from 2.4GHz down to 1.8GHz. The proposed tunable BPF obtains a broader tuning pass band range compare to designs proposed in [7][8][9][10][11][12][13][14][15], moreover, the simple structure and synthesis of the proposed filter was chosen as it comes up with lower cost and less complexity in contrast to [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Compact Band-Pass Filter with Controllable Frequency Characteristics

Elfergani

Rodriguez

Abd‐Alhameed

2018

Loughborough Antennas &Amp; Propagation Conference 2018 (LAPC 2018)

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A compact microstrip tunable bandpass filter (BPF) is proposed and investigated. The filter synthesis and structure are based on parallel microstrip lines that are printed over an RT/ duroid 6006/6010LM substrate, with a permittivity of 10.2 and thickness of 1.27mm. A parallel topology method can be adjusted for the filter tunablility in the center frequency, to allow fully tuned frequency response. In order to tune the targeted pass band frequency, a lumped element capacitor is used. This capacitor was optimally located over the middle strip resonator. The pass band frequency was smoothly shifted downwards from 2.4GHz to 1.8GHz, when the capacitance of the capacitor varies from 0.15pf to 0.9pf. The proposed filter demonstrates in-band insertion loss of around 0.25 dB and return loss better than 20 dB over the whole pass band frequency. This presents the filter as a favourable candidate for numerous smart future applications.

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“…Continuous tuning across broad frequency range requires many p-i-n diodes, which make them unsuitable for such a purpose. In [19]- [21], examples of a varactor, used for frequency reconfigurability, are shown where the relative high bias voltage levels and linearity are the main limitations. Recently RF microelectromechanical systems (MEMS) are getting more attention as they are approaching maturity and have started to be implemented in commercial mobile devices [9].…”

mentioning

confidence: 99%

A Tunable RF Front-End With Narrowband Antennas for Mobile Devices

Bahramzy

Olesen²,

Madsen³

et al. 2015

IEEE Trans. Microwave Theory Techn.

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In conventional full-duplex radio communication systems, the transmitter (Tx) is active at the same time as the receiver (Rx). The isolation between the Tx and the Rx is ensured by duplex filters. However, an increasing number of long-term evolution (LTE) bands crave multiband operation. Therefore, a new front-end architecture, addressing the increasing number of LTE bands, as well as multiple standards, is presented. In such an architecture, the Tx and Rx chains are separated throughout the front-end. Addition of bands is solved by making the antennas and filters tunable. Banks of duplex filters are replaced by tunable filters and antennas, providing a duplexer function over the air between the Tx and the Rx. A hardware system has been designed and fabricated to demonstrate the performance of this front-end architecture. Measurements demonstrate how the architecture addresses inter-modulation and Rx desensitization due to the Tx signal. The filters and antennas demonstrate tunability across multiple bands. System validation is detailed for LTE band I. Frequency response, as well as linearity measurements of the complete Tx and Rx front-end chains, show that the system requirements are fulfilled.Index Terms-Low-noise amplifier (LNA), power amplifier (PA), tunable filters, tunable front-end, tunable microelectromechanical systems (MEMS) capacitors, tunable narrowband antennas.

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A Controllable Bandwidth Filter Using Varactor-Loaded Metamaterial-Inspired Transmission Lines

Cited by 17 publications

References 13 publications

Programmable Multifunctional RF/Microwave Circuit for Antenna and Filter Operation

Programmable Multifunctional RF/Microwave Circuit for Antenna and Filter Operation

Compact Band-Pass Filter with Controllable Frequency Characteristics

A Tunable RF Front-End With Narrowband Antennas for Mobile Devices

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