A Planar Four-Port Integrated UWB and NB Antenna System for CR in 3.1GHz to 10.6GHz

This article discusses the design of a compact antenna system for spectrum interweaved cognitive radio (CR). The system consists of a sensing filtenna and three communicating antennas. The sensing ultra‐wideband (UWB) antenna is a coplanar‐waveguide (CPW)‐fed monopole (2.2–11 GHz). The narrowband communicating patch antennas are reconfigurable through a switching mechanism, operating in six different frequency bands (5.54, 6.12, 7.60, 8.25, 9.64, and 10.29 GHz). To block the Wi‐MAX and WLAN bands, the proposed design uses a meandering slot and a stepped U‐slot in the monopole. Analysis of communicating antennas using the theory of characteristic mode analysis indicates good radiation in the desired frequencies. Isolation among these antennas is better than −18 dB. A constant group delay and linear phase response indicate a good time‐domain performance of the proposed UWB antenna. Simulated results match closely with those from measurements on the prototype. The proposed antenna system can find applications in various sectors adopting CR like internet of things.

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“…Several integrated antennas for CR systems are available in literatures. [6][7][8][9][10][11][12][13][14][15] Dual-port antenna systems include:…”

Section: Introductionmentioning

confidence: 99%

Compact reconfigurable antenna system for spectrum interweaved cognitive radio

Parida

Sahu

Naik

et al. 2022

Int J RF Mic Comp-Aid Eng

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“…In [10], NB antenna elements are integrated with an UWB sensing antenna by using PIN diodes and varactor diodes to cover an operating range from 0.72 to 3.44 GHz. Gandhi et al, presented four port [11] and five port [12] integrated UWB and NB antenna for CR systems. Both the designed antennas cover the entire UWB range of 3.1 to 10.6 GHz for sensing as well as communication purposes.…”

Section: Introductionmentioning

confidence: 99%

Single Port Multimode Reconfigurable UWB-NB Antenna for Cognitive Radio Applications

Kadam

Gudino

Ramesha

et al. 2022

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, a compact, single port, multimode reconfigurable UWB-NB antenna with a novel feeding network is presented. The proposed antenna consists of a pentagonal-shaped monopole radiator, a beveled-shaped partial defected ground plane with a rectangular slot, and a reconfigurable bypass feeding network. The antenna realizes a wideband frequency range from 2.4 to 18 GHz and four narrow band frequency ranges, 5.3 to 6.8 GHz, 6.0 to 7.6 GHz, 7.2 to 8.8 GHz and 8.4 to 11.4 GHz. The antenna provides an omnidirectional radiation pattern with gain from 2.2 to 6.2 dBi maximum at 12 GHz and voltage standing wave ratio (VSWR) ranges from 1 to 2. The fabricated antenna has an overall dimension of 18×21×1.6 mm 3 . Sensing and tuning ranges of the fabricated antenna shows good agreement with the simulation results. The proposed antenna has an advantage of simple design, low profile, single port excitation and omnidirectional radiation pattern making it suitable for applications such as handheld mobile cognitive radio systems.

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“…Proper switching mechanism is employed to select a suitable NB antenna for communication. In References27–31, authors discussed numerous multi‐port integrated ultra‐wideband and NB antenna structures for cognitive radio applications. One particular NB antenna is excited with required communication signal (termed as excitation switching) depending on the identified spectrum hole frequency by the UWB sensing antenna.…”

Section: Introductionmentioning

confidence: 99%

“…If multiple spectrum holes are identified, then particular operating NB antennas are excited with communication signals and remaining NB antennas are kept idle. In the literature, [27][28][29][30][31] several multi-port integrated UWB and NB antenna structures are explored for cognitive radio application. However, reconfiguration mechanism is not adopted in this literature.…”

Section: Introductionmentioning

confidence: 99%

A reconfigurable integrated 4‐port UWB and NB antenna system for cognitive radio application

Nella

Vattiprolu

Saha

et al. 2021

Int J RF Mic Comp-Aid Eng

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A frequency reconfigurable 4‐port integrated ultra‐wideband and narrowband antenna structure for cognitive radio application is reported in this article. The proposed structure comprises four distinct antennas integrated on FR‐4 substrate of dimensions 42 × 42 × 1.6 mm. The first antenna, named as ANT‐1, is a CPW fed UWB antenna exhibiting −10 dB impedance bandwidth from 3 to 11 GHz, which includes the FCC unlicensed band ranging from 3.1 to 10.6 GHz. The remaining three antennas, named as ANT‐2, ANT‐3, and ANT‐4, respectively, are frequency reconfigurable narrowband antennas. Each narrowband antenna is incorporated with a varactor diode to obtain a fine frequency tuning. The first narrowband antenna (ANT‐2) covers a mid‐frequency band from 5.35 to 8.2 GHz. The second narrowband antenna (ANT‐3) attains a lower‐band from 3.1 to 5.375 GHz while the third narrowband antenna (ANT‐4) achieves an upper band ranging from 8 to 10.8 GHz. Simulated transmission coefficients are less than −16 dB between the antennas. ANT‐1, 2, 3, and 4 accomplish simulated maximum peak gains of 4.92, 3.4, 2.9, and 3.2 dBi, respectively. The proposed structure is fabricated to validate the simulation results. The measured reflection and transmission coefficient results are analyzed with the simulation results revealing a good matching.

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A Planar Four-Port Integrated UWB and NB Antenna System for CR in 3.1GHz to 10.6GHz

Cited by 7 publications

References 5 publications

Compact reconfigurable antenna system for spectrum interweaved cognitive radio

Compact reconfigurable antenna system for spectrum interweaved cognitive radio

Single Port Multimode Reconfigurable UWB-NB Antenna for Cognitive Radio Applications

A reconfigurable integrated 4‐port UWB and NB antenna system for cognitive radio application

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