A Survey on Planar Antenna Designs for Cognitive Radio Applications

Nella, Anveshkumar; Gandhi, A. S.

doi:10.1007/s11277-017-4883-y

Cited by 28 publications

(12 citation statements)

References 74 publications

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“…In this antenna system, a large sensing antenna is used as a ground plane for other NB antennas. A recent review of the CR antenna system is reported in [18]. However, the above discussed integrated CR systems have some drawbacks, like poor gain and efficiency, lower sensing bands, fabrication complexity, large antenna dimension, and low isolation among antennas.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Multi-Port Antenna System for Cognitive Radio

Parida¹,

Mishra²,

Sahoo³

et al. 2020

PIER C

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This paper proposes a hybrid, compact, low profile, and multi-port antenna system for Cognitive Radio (CR). This system consists of a CPW-fed sensing UWB monopole (2-11 GHz) and three NB antennas, out of which one is standalone (7.355 GHz); one is dual-band (5.834 GHz and 8.786 GHz); and the other is reconfigurable (3.863 GHz, 4.664 GHz, 5.2 GHz, and 6.13 GHz) using switching mechanism. This antenna system exhibits less than −15 dB isolation over the operating band. The system is simulated using CST Microwave Studio, and a prototype is fabricated to verify the results. The simulated results are in good agreement with measured ones. The proposed antenna is suitable to operate in C-band, ISM/WLAN/Military application, mid-band 5G, maritime radio navigation, X-band satellite communication, and public safety wireless communication.

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Section: Introductionmentioning

confidence: 99%

A Hybrid Multi-Port Antenna System for Cognitive Radio

Parida¹,

Mishra²,

Sahoo³

et al. 2020

PIER C

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“…Reconfiguration was achieved by incorporating PIN diodes as switches in the feed lines of filtennas. Conventionally, single port reconfigurable UWB/narrow band (NB) antenna and dual‐port‐integrated UWB and reconfigurable NB antennas [3–5] are mostly used for cognitive radio applications. However, when multiple spectrum holes are identified, systems with integrated UWB sensing antenna and multiple wideband/NB antennas are highly preferred to improve spectrum utilisation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…However, the main challenges present in this design are isolation and space limitation. More importantly, the drawbacks associated with reconfigurable antennas [3] can be overcome and all the advantages of the planar antennas can be captured. However, here also, the excitation switching reconfigurable mechanism is done among all the wideband/NB antennas based on the unused spectrum holes identified.…”

Section: Introductionmentioning

confidence: 99%

Twelve port MIMO antenna with polarisation diversity for cognitive radio applications

Srikar

Anuradha

2019

Electron. lett.

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In this letter, to overcome the drawbacks in reconfigurable antennas and maintain all the advantages in planar antennas, a compact 12 port integrated UWB and narrow band (NB)/wideband antennas for cognitive radio MIMO applications with polarisation diversity is presented. The proposed system has one pair of UWB antennas for sensing the spectrum and five pairs of NB/wideband antennas for communication. Each pair has two identical antennas, which are orthogonal to each other for polarisation diversity. Sensing antennas linked with ports (P1 and P7) have operating bandwidth of 3–11 GHz, whereas the antennas linked with ports (P2 and P8), (P3 and P9), (P4 and P10), (P5 and P11), and (P6 and P12) have operating bandwidths of 3.5–5.8 GHz, 2.8–3.5 GHz and 5.6–8 GHz (dual band), 8–8.4 GHz and 9–9.8 GHz (dual band), 8.4–9 GHz, and 9.8–11 GHz, respectively. Moreover, the overall volume of the antenna is 58mm × 50mm × 1.6 mm and the entire UWB spectrum is covered by NB/wideband antennas. Also, without any decoupling network, isolation of better than 20 and 15 dB is achieved between every two identical and non‐identical antennas, respectively.

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“…In these structures, switching is employed in the narrowband antennas to attain various operating frequencies using a single antenna. However, the reconfigurable mechanisms are having defects like non-linear effects of switches, negative effects of biasing circuitry, additional power requirements, and slow tuning [6], [7]. Sometimes, they need extra biasing circuitry or motors to obtain proper antenna reconfiguration [8].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, these systems are able to perform only one communication operation at a time. So, to reduce these constraints, we introduced the concept of multi-port integrated UWB and NB antennas systems in [6]. As an initial stage of exploring multi-port integrated UWB and NB antennas systems only two NB antennas are integrated on the UWB antenna substrate [9].…”

Section: Introductionmentioning

confidence: 99%

Lumped Equivalent Models of Narrowband Antennas and Isolation Enhancement in a Three Antennas System

Anveshkumar¹,

Gandhi²

2018

RADIOENGINEERING

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This paper initially discusses lumped equivalent models of narrowband (NB) antennas and then presents a technique to enhance isolation between UWB and NB antennas of the three antennas system. The proposed models are able to yield similar S-parameter performance as that of NB antennas at their resonant frequencies. Also, a good match is observed at other frequencies between the HFSS and AWR results. This paper reports an isolation enhancement technique using microstrip lines. The proposed approach enhances a minimum isolation of 11 dB at respective resonant frequencies. This paper also reports lumped equivalent models of dual band reject filters (DBRFs). Proposed geometry is fabricated and tested. Experimental result shows an agreement between the simulated and measured results.

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A Survey on Planar Antenna Designs for Cognitive Radio Applications

Cited by 28 publications

References 74 publications

A Hybrid Multi-Port Antenna System for Cognitive Radio

A Hybrid Multi-Port Antenna System for Cognitive Radio

Twelve port MIMO antenna with polarisation diversity for cognitive radio applications

Lumped Equivalent Models of Narrowband Antennas and Isolation Enhancement in a Three Antennas System

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