Microstrip Switchable Bandstop Filter using PIN Diodes with Precise Frequency and Bandwidth Control

Brito‐Brito, Zabdiel; Llamas-Garro, Ignacio; Pradell, L.; Corona‐Chávez, Alonso

doi:10.1109/eumc.2008.4751804

Cited by 22 publications

(16 citation statements)

References 11 publications

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“…In Ref. [36], a switchable band-stop filter with two different center frequencies is presented; the filter topology allows precise control over frequency and bandwidth discretely, achieved by choosing resonator sections switched by PIN diodes. In this article, we propose selectivity tuning in addition to center frequency and bandwidth reconfigurability, using a quasi-elliptic band-stop filter response; selectivity tuning is achieved in a band-stop filter response for the first time by the authors as compared to previous work in Ref.…”

Section: Introductionmentioning

confidence: 99%

Fully adaptable band‐stop filter using varactor diodes

Musoll-Anguiano

Llamas-Garro

Brito‐Brito

et al. 2010

Micro & Optical Tech Letters

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In this article a reconfigurable band-stop filter able to reconfigure center frequency, bandwidth, and selectivity for fine tuning applications is demonstrated, device topology discussion and implementation details are given, and followed by discussion on simulations and measurements. The reconfigurable filter topology has four poles and a quasi-elliptic band-stop filter response. The device is tuned by varactor diodes placed at different locations on the filter; varactors are voltage controlled in pairs due to filter symmetry for center frequency and bandwidth control. An additional varactor is placed on a crossing line to move a pair of transmission zeros, closer or farther to the filter center frequency, which tunes filter selectivity. Simulations show a tuneable center frequency range from 1.42 to 1.48 GHz, a tuneable fractional bandwidth range from 9.46 to 12.96%, and a tuneable selectivity range from 0.53 to 0.65 dB/MHz. Measurements show a tuneable center frequency range from 1.37 to 1.43 GHz, a tuneable fractional bandwidth range from 11.31 to 15.93%, and a selectivity tuning range from 0.37 to 0.40 dB/MHz. Simulations and measurements are in good agreement.

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Section: Introductionmentioning

confidence: 99%

Fully adaptable band‐stop filter using varactor diodes

Musoll-Anguiano

Llamas-Garro

Brito‐Brito

et al. 2010

Micro & Optical Tech Letters

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“…Recently, new designs of bandstop to allpass reconfigurable filters were investigated and reported in [19][20][21][22]. This includes a potential bandstop to allpass reconfigurable filter using stepped impedance dual mode resonator [18,23].…”

Section: Introductionmentioning

confidence: 99%

Bandstop to Allpass Reconfigurable Filter Technique in SPDT Switch Design

Shairi

Ahmad²,

Wong³

2013

PIER C

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Abstract-In this paper, a bandstop to allpass reconfigurable filter technique is proposed in Single Pole Double Throw (SPDT) switch design. Proof of concept of the bandstop to allpass reconfigurable filter is presented. It is physically realized using transmission line and radial stub in 3.5 GHz band (3.4 to 3.6 GHz). The isolation, insertion loss and return loss of the SPDT switches are analyzed and to validate this technique the prototypes are fabricated using FR4 substrate with a thickness of 16 mm. A very good agreement is shown between the simulated and measured results. Using this technique, it is able to produce more than 30 dB isolation with minimum number of PIN diodes, thus reducing 42.7% of the total circuit size compared with conventional design. Besides, additional 22.9% of isolation bandwidth can be obtained with the use of radial stub compared with transmission line stub. The potential application of this SPDT switch is Time Division Duplex (TDD) switching for WiMAX and LTE communication system in the 3.5 GHz band.

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“…The designed filter falls into a category of admittance inverter coupled resonator filter, with two discrete bandwidths at 5.6 GHz. In [12], a bandpass filter which is switchable between two central frequency states is presented. The designed filter uses PIN diodes for switching, such that in each frequency states a constant bandwidth is maintained.…”

Section: Pin Diodesmentioning

confidence: 99%

“…In Figure 1, the fabricated prototype of the switchable bandpass filter is illustrated. By changing the polarity of the bias voltage, the filter is switched between 1.5 GHz and 2 GHz center frequencies, respectively [12].…”

Section: Pin Diodesmentioning

confidence: 99%

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Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Adhikari

Wu²

2013

PIER

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Abstract-An overview of state-of-the-art frequency tunable technologies in the realization of tunable radio frequency (RF) and microwave tunable circuits is presented with focus on filter designs. Those enabling techniques and materials include semiconductors, microelectro-mechanical systems (MEMS), ferroelectric and ferromagnetic materials. Various performance indicators of one-dimensional tunable filters are addressed in terms of tunability, losses, signal integrity and other aspects. Fundamental limitations of the classical one-dimensional tuning method are discussed, which makes use of only one type of tunable elements such as either electric or magnetic tuning/controlling of circuit parameters. Requirements of simultaneous electric and magnetic two-dimensional tuning techniques are highlighted for achieving an unprecedented and advantageous wider modal tuning. It is believed that this emerging scheme will lead its way in the realization of future highly efficient and tunable RF and microwave components and devices.

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Microstrip Switchable Bandstop Filter using PIN Diodes with Precise Frequency and Bandwidth Control

Cited by 22 publications

References 11 publications

Fully adaptable band‐stop filter using varactor diodes

Fully adaptable band‐stop filter using varactor diodes

Bandstop to Allpass Reconfigurable Filter Technique in SPDT Switch Design

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

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