Reconfigurable Filtenna using Varactor Diode for Wireless Applications

Araújo, Jacqueline; Oliveira, Mayara; Filho, P. H. B. Cavalcanti; Silva, C. P. N.; Coutinho, M. S.; Melo, M. T. de; Llamas-Garro, Ignacio; Barboza, A. G.

doi:10.1590/2179-10742021v20i41152

Cited by 3 publications

(1 citation statement)

References 19 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the ability to adjust the filter depending on the desired frequency range is an excellent solution. In the microwave frequency range, the use of a varactor diode [27][28][29] can provide the ability to control the bandwidth of a BPF. Such tuning is achieved by controlling the resonant frequencies, while changing the capacitance of the varactor by applying a bias voltage to it.…”

Section: Introductionmentioning

confidence: 99%

Регульований Смуговий Фільтр На Основі Кільцевих Резонаторів Для Мікрохвильових Застосунків

Khobzei

Apostoliuk

Ткач

et al. 2023

SISIOT

View full text Add to dashboard Cite

The paper presents the principle of a microwave adaptive band-pass filter based on the cascade of ring resonators. The filter is performed as a planar microstrip technology with thickness of around 1 mm to ensure compactness of the device. The ring resonators, being a part of metamaterials, can be considered as an equivalence of an oscillator and is conventionally used in the microwaves. While a quite number of the filters with predefined parameters are well-known, the adaptive filters the throughput and output characteristics of which can be adjusted depending on the input ones is the topical problematic nowadays and, at least, for the closest future. We have investigated in the paper the possibilities of adjustment the considered filter’s transmission characteristics through the ring design, distance between them, and discussed other features, which have impact. For example, it allows expanding of the filter bandwidth from 250 to 60 MHz for simultaneous change of a distance between the adjacent rings. We have suggested the approach how to do the filter time-dependent. A varactor diode inserted into the gap of the middle ring is controlled with an independent external source and can adjust the filter bandwidth from 80 up to 140 MHz for the varactor capacitance variation from 16 to 6 pF (bias voltage variation from 1 to 7 V) that covers the existing communication networks, such as mobile generations, Bluetooth, Wi-Fi, etc. and can be applied for modern smart technologies of the Internet-of-Things for a remote control. It becomes possible because different sensing elements, such as photodiodes, Hall effect sensors, photoresistors, etc., can be exploited as the aforementioned external source.

show abstract

Section: Introductionmentioning

confidence: 99%

Регульований Смуговий Фільтр На Основі Кільцевих Резонаторів Для Мікрохвильових Застосунків

Khobzei

Apostoliuk

Ткач

et al. 2023

SISIOT

View full text Add to dashboard Cite

show abstract

Compact dual-port MIMO filtenna-based DMS with high isolation for C-band and X-band applications

Elabd

2023

J Wireless Com Network

View full text Add to dashboard Cite

A dual-port multiple-input multiple-output (MIMO) filtenna with minimal sizes of 80 × 45 mm2 is set up in this study. Each element in this MIMO filtenna is positioned orthogonally to the one next to it to improve isolation. For the MIMO element to achieve high-frequency selectivity and compact size, a frequency-reconfigurable filtenna that was created by fusing a band-pass filter and a monopole radiator was used. The suggested filtenna can switch between its C-band and X-band operating states with ease. On build the filtenna circuit, a band-pass filter based on defective microstrip structure is inserted to a circular monopole radiator. The developed filtenna operates in the C-band frequency range of 6.5–8 GHz and the X-band frequency range of 8–12 GHz. It is possible to use the X-band operating state for communication in a cognitive radio environment. Used as a decoupling structure, metamaterial structures can increase isolation to more than 40 dB across the bandwidth. The suggested MIMO filtenna system has an envelope correlation coefficient of 2.4e−6, a peak gain of 6 dBi, and an impedance bandwidth of 7.4–7.75 GHz. The MIMO filtenna is constructed and measured, and the findings of the measurement and simulation are in good agreement.

show abstract

Efficient design of a wideband tunable microstrip filtenna for spectrum sensing in cognitive radio systems

Elabd,

Hussein

2023

J Wireless Com Network

View full text Add to dashboard Cite

This paper presents a novel design of a compact, wideband tunable microstrip filtenna system for effective spectrum sensing in cognitive radio (CR) applications. The proposed filtenna structure has a total bandwidth of $$1.63\,\text{GHz}$$ 1.63 GHz and flexible frequency scanning design throughout the frequency range from $$1.93\,\text{ to }\,3.56\,\text{ GHz}$$ 1.93 to 3.56 GHz with high selectivity and narrow bandwidths ranging from $$39.9\,\text{to}53\,\text{MHz}$$ 39.9 to 53 MHz . Frequency tuning is accomplished electrically via integrating a varactor diode into the filtenna construction. The filtenna is realized on a Rogers TMM4 substrate with $$h=1.52\,\text{mm}$$ h = 1.52 mm thickness and relative dielectric constant of $${\varepsilon }_{r}=4.5$$ ε r = 4.5 with dimensions of $$(25\times 35)\, {\text{mm}}^{2}$$ ( 25 × 35 ) mm 2 . The obtained gain and efficiency of the filtenna ranged from $$0.7$$ 0.7 to $$2.26\,\text{dBi}$$ 2.26 dBi and 49% to 60%, respectively, within the tuning range. Simple biasing circuitry, wideband operation, and compact planar structure are distinctive and appealing aspects of the design. For the manufactured prototypes, a significant level of agreement is found between the simulated and measured results in terms of scattering parameter $${\text{S}}_{11}$$ S 11 and radiation patterns at different operating frequencies.

show abstract

Reconfigurable Filtenna using Varactor Diode for Wireless Applications

Cited by 3 publications

References 19 publications

Регульований Смуговий Фільтр На Основі Кільцевих Резонаторів Для Мікрохвильових Застосунків

Регульований Смуговий Фільтр На Основі Кільцевих Резонаторів Для Мікрохвильових Застосунків

Compact dual-port MIMO filtenna-based DMS with high isolation for C-band and X-band applications

Efficient design of a wideband tunable microstrip filtenna for spectrum sensing in cognitive radio systems

Contact Info

Product

Resources

About