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A new approach is presented in this paper to reduce mutual coupling between two closely‐spaced planar monopole antennas. The approach employs either two parallel metallic strips or a single strip with a meander‐shaped slotted pattern symmetrically placed between the two antennas with their edges being separated by 4 mm and 8 mm, respectively. The novel aspect of our approach is that the decoupling...
This paper presents a new Defected Ground Structure (DGS) to enhance the isolation between two closely spaced circular patches for wireless applications. The antennas are placed on a Roger substrate with a relative permittivity of 3 and thickness of 1.52 mm. Four arcs are slotted on the ground underneath the substrate to eliminated the mutual current interacting between the elements. An enhancement...
This paper presents a new proposed grounded strip line with diamond slots structure to reduce the mutual coupling between two closely spaced rectangular patch antennas for WLAN applications. The two patches are printed on a Roger RO3003 substrate with a relative permittivity of 3 and thickness of 1.52 mm. The decoupling structure is composed of diamond shape slots etched on a rectangular metallic...
This paper investigates the effects of bending on the performance of a flexible dual-band printed monopole antenna designed to work for GPS, WLAN, and WiMAX applications. The antenna is printed on a Polyimide substrate with a relative permittivity of 4.3 and thickness of 25 pm. The antenna is fed by a coplanar waveguide transmission line to enhance the impedance matching over the wide operating bandwidth...
The effects of thickness and dielectric constant of flexible substrates on the performance of a circular planar monopole antenna (PMA) is reported in this paper. The antenna is printed on a flexible Polyimide substrate and fed by 50 Ω microstrip line. Results revealed that substantial effect on the antenna performance due to substrate thickness and material even if the radiating structure is ungrounded...
This paper presents the design and parametric study of a tunable dual band square slot antenna with stub for DSC, ISM, and WiMAX applications. This dual band antenna has an ability to be tuned to any of the mentioned bands, according to the required applications, depending on the length of square side and the stub. The overall size of the designed antenna is 50mm × 50mm. The antenna has been etched...
This paper presents a simple yet very effective decoupling mechanism based on the insertion of two adjacent planar monopole rectangular patch antennas separated by λo/62. The array achieves a total realized gain of 3.48 dB (exciting one port) and 4.78 dB (exciting two ports), a relative bandwidth of 49 % ( 2 – 3.3 ) GHz over which the matching level |S21| is less than −10 dB and a coupling level |S...
This paper presents a mutual reduction technique based on the insertion of two strips between two adjacent planar monopole rectangular patch antennas with an edge to edge separation of λo/31. The array achieves a total realized gain of 3.73, 4.39 and 3.84 dB at 1.85, 2.4, and 3.5 GHz respectively, a relative bandwidth of 69% (1.8 – 3.7) GHz over which the matching level |S11| is less than −10 dB and...
This paper presents the implementation of a fractal based defected ground structure DGS to reduce the interaction between two closely spaced planer monopole patch antennas. The design achieves a −7 dB reduction in mutual coupling level with antennas' edge to edge separation of λo /25 over a bandwidth of 51.8 % (2 – 3.4) GHz in which the reflection coefficient is less than −10 dB and a realized total...
Until recently, the UWB antenna has been used in many applications within different areas such in medical applications, multimedia connectivity, and personal communications, to mention a few, due to the design simplicity, low power, and high data rate transmission. The monopole antenna is a good candidate to be used in such applications due to the compact size, simplicity of fabrication, and cost...
This paper proposes a wearable dual-band square slot antenna with stub for ISM and WiMAX applications. The antenna has been built on a Vinyl substrate with a relative permittivity of 2.5 and a thickness angle of 0.47 mm. The square side length and the length of the stub are chosen to enable the antenna to provide a dual-band on 2.4 GHz and 3.5 GHz. The simulated and practical S-Parameters of the proposed...
This paper presents a planar slotted meander line structure to reduce the mutual coupling between two microstrip fed planar monopole patch antennas. The array provides a relative operating bandwidth of 98 % (1.37–4.00) GHz matched at a reflection coefficient S11 and S22 less than −10 dB with a total realized gain of 3.9, 4.66, and 4 dB at 1.85, 2.4, and 3.5 GHz respectively. The isolation level has...
Recent demands for miniaturized, lightweight, high data rate, and reliable wireless devices motivated researches and designers of wireless systems to adopt the use of multiple input-multiple output MIMO antenna arrays with close proximity of each other. One of the difficulties is to overcome the problems associated with the low isolation between any two closely spaced antennas. The low profile, small...
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