A Compact Integrated UWB/Reconfigurable Microstrip Antenna for Interweave Cognitive Radio Applications

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

doi:10.15866/irecap.v8i1.13078

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…The isolation between the two antennas is better than -10 dB. In [12] the antenna supports frequency reconfigurability from 5-6 GHz. The antenna gain and mutual coupling between the sensing and communicating antenna are 0.5 dBi and less than -20 dB respectively.…”

Section: Introductionmentioning

confidence: 94%

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New compact multiband inverted-L frequency reconfigurable antenna for cognitive radio applications

Jabber

Thaher

2020

IJEECS

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This paper presents, new compact and multiband frequency reconfigurable antenna for cognitive radio applications. A UWB sensing and reconfigurable communicating antennas are contained at the same substrate, where the UWB sensing antenna is an elliptical printed monopole antenna operates on frequency band from (2.65-22.112) GHz which can cover the UWB frequency band from 3.1 to 10.6 GHz, while the communicating antenna is an inverted-L frequency reconfigurable antenna operates on three bands of 1.49 GHz, 5.58 GHz, and 5.6 GHz under (S11 ≤ -10 dB) with a fractional bandwidth of 5.872%, 6.02%, and 6.05% respectively. The proposed antenna used to operate in two modes one for cognitive radio applications to cover WLAN applications at 5.5 GHz and 5.6 GHz and the second mode for wireless Ethernet, GPS synchronization, and Internet of Things that Matter (IoTtM) at 1.49 GHz. The frequency reconfigurability is obtained by using only a single RF switch (PIN diode) for changing the operating frequency. The antenna overall dimensions are 72 x 36 x 1.6 mm<sup>3</sup> printed on an FR-4 epoxy substrate of 4.3 relative-permittivity, loss tangent tan (δ) = 0.002 and 50 Ω micro stripline feed. The obtained simulated gain is ranging from 1.35 to 4.132 dBi. The S11 and isolation (S12) between the two antennas are under -20 dB and -17 dB respectively at the resonant frequencies.

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Section: Introductionmentioning

confidence: 94%

“…In [11,12] a CR antenna of two ports based on an electrical reconfigurable antenna is proposed. In [11] the antenna comprises a UWB sensing antenna of half egg-shaped with a reconfigurable monopole antenna.…”

Section: Introductionmentioning

confidence: 99%

New compact multiband inverted-L frequency reconfigurable antenna for cognitive radio applications

Jabber

Thaher

2020

IJEECS

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“…Since the MIMO antenna have transmission coefficients less than −20 𝑑𝐵, the isolation between the antennas is almost perfect without the need for adding isolation elements because it is less than the margin of −15 dB [9,23,24]. 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.…”

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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“…As the capacitance value increased, current flow through the varactor diode increases so that the loss is increased as well. Therefore, the reconfigurable antenna gain is reduced because of the characteristics varactor diode loss at lower resonant frequency range . Figure shows the comparison between simulated and measured polar radiation pattern (E‐plane co‐) of the reconfigurable antenna for corresponding reverse dc bias voltage: 1.0 V, 3.0 V, and 6.0 V. However, there is a difference in a radiation pattern because of effect of the cable and stand in the chamber room.…”

Section: Design Of Reconfigurable Integrated Filter and Antenna (Filtmentioning

confidence: 99%

Design of reconfigurable integrated substrate integrated waveguide (SIW) filter and antenna using multilayer approach

Sam

Zakaria

2018

Int J RF Microw Comput Aided Eng

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This article presents an integrated technique for reconfigurable substrate integrated waveguide (SIW) and reconfigurable patch antenna by using the varactor diodes. A reconfigurable SIW filter and reconfigurable patch antenna were integrated using the multilayer technique into a single structure in order to realize the integration technique. Design and validation of an equivalent circuit with the varactor diode is presented to study the tunable mechanism. A good performance between the simulated and measured results was achieved. This proposed structure of the reconfigurable integrated SIW filter and antenna is useful for wireless communication systems especially in telecommunication technology.

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A Compact Integrated UWB/Reconfigurable Microstrip Antenna for Interweave Cognitive Radio Applications

Cited by 12 publications

References 12 publications

New compact multiband inverted-L frequency reconfigurable antenna for cognitive radio applications

New compact multiband inverted-L frequency reconfigurable antenna for cognitive radio applications

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

Design of reconfigurable integrated substrate integrated waveguide (SIW) filter and antenna using multilayer approach

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