A compact cognitive radio UWB/reconfigurable antenna system with controllable communicating antenna bandwidth

Abdulhameed, Abdulghafor A.; Alnahwi, Falih M.; Swadi, Husham Lateef; Abdullah, Abdulkareem S.

doi:10.1080/1448837x.2019.1575003

Cited by 18 publications

(6 citation statements)

References 11 publications

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“…The Envelop Correlation Coefficient (𝐸𝐶𝐶) between every two antenna elements (say 1 and 2) is given by [25]: The mutual coupling between the four antennas can be demonstrated with the aid of the transmission coefficients between the antennas. Unlike the non-symmetrical MIMO structure which requires the forward and the backward transmission coefficients [21,22], the symmetrical MIMO structures requires just the forward transmission coefficient in describing the mutual coupling between the antennas. Figure 12 shows the simulated sparameters of the MIMO antenna, whereas Figure 12 illustrates the measured s-parameters of the proposed MIMO antenna.…”

Section: Mimo Structurementioning

confidence: 99%

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

Alnahwi

Al‐Yasir

See

et al. 2022

Sensors

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In this paper, single-element and MIMO microstrip antenna with two pairs of unequal slits is proposed as a circularly polarized antenna with negligible back radiation for 5G mid-band handsets. The unequal pairs of slits are engraved on the antenna patch to guarantee the presence of the circular polarization (CP). The proximity-coupled feeding technique is used to excite the proposed microstrip antenna in order to provide larger antenna −10 dB bandwidth which approaches 10.8% (3.48–3.87 GHz). A novel analysis technique is proposed in this paper that demonstrates the 3D axial ratio pattern in order to generate CP in the broadside direction without affecting the structure of the ground plane which ensures weak back radiation. The 3 dB axial ratio bandwidth (ARBW) is found to be equal to 4.1% extended along the range (3.58–3.73 GHz). To make the design more compatible with the 5G mid-band handsets, the 2 × 2 MIMO structure of the proposed antenna with reduced mutual coupling (less than −20 dB) is also presented in this work. The simulation and measured results are in good agreement, and both verify the CP characteristics and the weak back radiation of the proposed antenna.

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Section: Mimo Structurementioning

confidence: 99%

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

Alnahwi

Al‐Yasir

See

et al. 2022

Sensors

Self Cite

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show abstract

“…Figure 3A inset view shows the operating frequency under the four cases. It can be seen that it operates over partially S band, C band (4-8 GHz), X band (8)(9)(10)(11)(12) and partially on Ku band. Therefore, only one reconfigurable antenna under different switching conditions operates over different bands (wide/narrow).…”

Section: Designing Of Frequency Reconfigurable Antennamentioning

confidence: 99%

“…Some past studies on CR antenna are represented in Table 1. It reveals the fact that only limited similar type of research is has been carried out on CR antennas 4‐15 . The aim of the present work is to design a novel reconfigurable antenna by exploring the structure of hexagon‐shaped patch antenna which was not investigated much in past for designing CR antenna.…”

Section: Introductionmentioning

confidence: 99%

“…It reveals the fact that only limited similar type of research is has been carried out on CR antennas. [4][5][6][7][8][9][10][11][12][13][14][15] The aim of the present work is to design a novel reconfigurable antenna by exploring the structure of hexagon-shaped patch antenna which was not investigated much in past for designing T A B L E 1 Some past research on antenna design for cognitive radio application (along with the proposed work) Pin diodes CR antenna. The hexagonal printed patch geometry is improvised along with a nonconventional coplanar waveguide (CPW) feed.…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable hexagon shaped printed antenna for cognitive radio application

Goswami

Bhattacharya

Dasgupta

2020

Int J RF Microw Comput Aided Eng

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The article presents a new reconfigurable antenna suitable for cognitive radio (CR) application under interweave paradigm. The new sleeve-like geometry is improvised in the antenna for designing broadband sensing antenna and it consists of a hexagon shaped metallic patch along with modified coplanar ground plane structure and feed line (nonconventional coplanar waveguide feed). The p-in diodes are also incorporated with the printed antenna. By varying the switching states of the diodes, frequency hopping occurs over the frequency range 3.75 to 12.67 GHz (108.64% BW) which is better compared to the existing sensing antennas used for designing CR antenna. The antenna also offers suitable gain and omnidirectional radiation pattern over the operating range of frequencies. In addition to frequency domain analysis, time-domain synthesis of the proposed antenna is also executed by using well-known electromagnetic solver CST software. Moreover, the antenna is fabricated and measured parameters are in good accordance with measured results.

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“…The UWB technology has two problems; the interference between the UWB and the other single bands operating at the same frequency, and the cost of providing the UWB spectrum for using just one or two narrow bands simultaneously. The cognitive radio system solved these problems with the help of two antennas—a UWB antenna for sensing idle bands and a reconfigurable antenna for communication in these bands [ 2 , 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

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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A compact cognitive radio UWB/reconfigurable antenna system with controllable communicating antenna bandwidth

Cited by 18 publications

References 11 publications

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

Single-Element and MIMO Circularly Polarized Microstrip Antennas with Negligible Back Radiation for 5G Mid-Band Handsets

Reconfigurable hexagon shaped printed antenna for cognitive radio application

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

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