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Reconfigurable ring filter with controllable frequency response.

Ab Wahab N, Mohd Salleh MK, Ismail Khan Z, Abd Rashid NE - ScientificWorldJournal (2014)

Bottom Line: For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept.The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range.Both designs are found to be compact with acceptable insertion loss and high selectivity.

View Article: PubMed Central - PubMed

Affiliation: Microwave Technology Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40150 Shah Alam, Selangor, Malaysia.

ABSTRACT
Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive elements. To show the advantage of the synthesis, it is applied to the reconfigurable filter design using RF lumped capacitors. The concept is further explored by introducing varactor-diodes to continuously tune the center frequency of the ring filter. For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept. The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range. Both designs are found to be compact with acceptable insertion loss and high selectivity.

Show MeSH
(a) Layout of the electronically reconfigurable ring bandpass filter using four Skyworks SMV 1800 varactors for impedances Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω; (b) photo of fabricated filter.
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fig12: (a) Layout of the electronically reconfigurable ring bandpass filter using four Skyworks SMV 1800 varactors for impedances Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω; (b) photo of fabricated filter.

Mentions: The electronically reconfigurable circuit is designed at 2 GHz with a chosen set of impedances given by Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω. The proposed reconfigurable ring bandpass filter is designed using four varactors with biasing circuits which are loaded at the edge of the ring resonator to create capacitance effect to the ring resonator. The circuit is implemented using microstrip technology and substrate Tachonic with characteristics given by εr = 4.5, h = 1.63 mm, and tanδ = 0.0035. The final layout of the filter is depicted in Figure 12(a) with dimensions summarized in Table 7 and a picture of the prototype microstrip reconfigurable bandpass filter is shown in Figure 12(b) as proved by work.


Reconfigurable ring filter with controllable frequency response.

Ab Wahab N, Mohd Salleh MK, Ismail Khan Z, Abd Rashid NE - ScientificWorldJournal (2014)

(a) Layout of the electronically reconfigurable ring bandpass filter using four Skyworks SMV 1800 varactors for impedances Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω; (b) photo of fabricated filter.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4121041&req=5

fig12: (a) Layout of the electronically reconfigurable ring bandpass filter using four Skyworks SMV 1800 varactors for impedances Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω; (b) photo of fabricated filter.
Mentions: The electronically reconfigurable circuit is designed at 2 GHz with a chosen set of impedances given by Zr = 80 Ω, Zoe = 75 Ω, and Zoo = 30 Ω. The proposed reconfigurable ring bandpass filter is designed using four varactors with biasing circuits which are loaded at the edge of the ring resonator to create capacitance effect to the ring resonator. The circuit is implemented using microstrip technology and substrate Tachonic with characteristics given by εr = 4.5, h = 1.63 mm, and tanδ = 0.0035. The final layout of the filter is depicted in Figure 12(a) with dimensions summarized in Table 7 and a picture of the prototype microstrip reconfigurable bandpass filter is shown in Figure 12(b) as proved by work.

Bottom Line: For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept.The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range.Both designs are found to be compact with acceptable insertion loss and high selectivity.

View Article: PubMed Central - PubMed

Affiliation: Microwave Technology Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40150 Shah Alam, Selangor, Malaysia.

ABSTRACT
Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive elements. To show the advantage of the synthesis, it is applied to the reconfigurable filter design using RF lumped capacitors. The concept is further explored by introducing varactor-diodes to continuously tune the center frequency of the ring filter. For demonstration, two prototypes of reconfigurable ring filters are realized using microstrip technology, simulated, and measured to validate the proposed concept. The reconfigured filter using lumped elements is successfully reconfigured from 2 GHz to 984.4 MHz and miniaturized by 71% compared to the filter directly designed at the same reconfigured frequency, while, for the filter using varactor-diodes, the frequency is chosen from 1.10 GHz to 1.38 GHz spreading over 280 MHz frequency range. Both designs are found to be compact with acceptable insertion loss and high selectivity.

Show MeSH