An electronically switchable <scp>UWB</scp> to narrow band antenna for cognitive radio applications

Jacob, N.; Kulkarni, Muralidhar; Krishnamoorthy, Kothandam

doi:10.1002/mop.32417

Cited by 13 publications

(5 citation statements)

References 16 publications

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“…Therefore, one of the benefits of increasing the broadband magnetic probe’s sensitivity is accurately estimating the magnetic field interference with these applications. The switchable magnetic probe can solve this issue using the different switching techniques presented in [ 33 , 34 , 35 ].…”

Section: Magnetic Probe Designmentioning

confidence: 99%

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Abdulhameed

Kubík

2022

Sensors

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This paper presents a printed magnetic probe that can switch from broadband to tunable narrowband for near-field measurement. In the early design stage, we created a printed loop gap resonator as a magnetic reference sensor for the pre-compliance test in a band up to 6 GHz. Consequently, the results showed a good response in terms of the S11 and S21 parameters of the proposed probe compared with the commercial magnetic sensor XF-R 3-1. The source noise might spread among different frequency bands, making the broadband magnetic probe the closest choice for estimating the magnetic field in the near-field region. Unfortunately, broadband magnetic probes have lower sensitivity than narrowband ones. One of the solutions to get high sensitivity is to connect the LNA to the output of the passive magnetic sensor. This work proposes a novel method to solve this issue using a PIN diode to change the broadband status into a high sensitivity narrowband status and then tune this narrowband across the most critical applications such as 3.5° GHz, 3.75° GHz, 4.8° GHz, and 5.2° GHz with the help of a varactor diode. Compared to the broadband status, an improvement of more than 10 dB has been obtained across all these wireless bands. Furthermore, the proposed structure’s isolation between the electrical and magnetic fields is about 13 dB.

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Section: Magnetic Probe Designmentioning

confidence: 99%

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Abdulhameed

Kubík

2022

Sensors

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“…Another innovative technology that has been utilized to make the best use of the frequency spectrum is called cognitive radio (CR). In the CR system, the primary users are assigned to specific frequency bands while the secondary users can access the unoccupied frequency band which will allow spectrum sharing when it is not in use and this is controlled by a spectrum sensing process [ 20 , 21 ]. Consequently, a reconfigurable microstrip antenna with a wide frequency band is required for continuous monitoring of the unused spectrum in the CR system.…”

Section: Introductionmentioning

confidence: 99%

Filtenna with Frequency Reconfigurable Operation for Cognitive Radio and Wireless Applications

et al. 2023

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A reconfigurable wideband monopole antenna is introduced in this paper for cognitive radio and wireless applications. The reconfigurability was achieved by four varactor diodes embedded in the band pass filter (BPF) structure which was integrated with the suggested antenna through its feed line. The simulated impedance characteristics coped with the measured ones after fabricating the suggested model with/without the reconfigurable BPF. Furthermore, the model achieved the desired radiation characteristics in terms of radiation pattern with acceptable gain values at the selected frequencies within the achieved frequency range (1.3–3 GHz).

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“…A rectangular microstrip antenna with a spanner-shaped feeding line [ 23 ], printed hexagonal antenna [ 24 ] and elliptical mono-pole antenna [ 25 ] is presented for wireless application, cognitive radio application, and detection application respectively. The mono-pole antenna used in [ 26 ] is operational from 2.8–10.6 GHz achieved a gain variation of 60 dB. Planar monopole antennas with multi-port have a bandwidth from 2–11 GHz, a gain variation of 30 dB, and an efficiency of 50% for cognitive radio [ 27 ] and UWB mono-pole in [ 28 ] achieves 85% bandwidth and a gain variation of 25 dB for spectrum sensing.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Arc Shaped Near Isotropic Self-Complementary Antenna for Spectrum Sensing Applications

Qureshi

Basir

Subhan

et al. 2023

Sensors

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This paper presents the design of an arc-shaped near-isotropic self-complementary antenna for spectrum sensing application. An arc-shaped dipole with horizontal and vertical arms is used to achieve a near isotropic radiation pattern. The radiation pattern improved by adjusting the horizontal and vertical arm lengths. Simulated and experimental results show that the proposed antenna has an impedance bandwidth of 146% (2.4–18.4 GHz) for VSWR ≤ 2 with a good radiation pattern. In order to quantify the antenna performance, antenna gain variation, bandwidth, efficiency, and size have been compared with previously reported designs. It is shown that the proposed arc-shaped antenna can achieve nearly isotropic radiation patterns with a maximum radiation efficiency of 92%. The isotropic performance of the antenna has been characterized by observing the radiation pattern and solid angle. The FR4 substrate is used as a dielectric with relative permittivity 4.4 and loss tangent of 0.02. (εr = 4.4, h = 1.6 mm) The simulated and measured results are in good comparison, and the proposed design is a suitable candidate for spectrum sensing.

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An electronically switchable UWB to narrow band antenna for cognitive radio applications

Cited by 13 publications

References 16 publications

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Filtenna with Frequency Reconfigurable Operation for Cognitive Radio and Wireless Applications

A Miniaturized Arc Shaped Near Isotropic Self-Complementary Antenna for Spectrum Sensing Applications

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