Development of “ H‐Shaped ” monopole antenna for IEEE 802.11a and HIPERLAN 2 applications in the laptop computer

2020 ◽  
Vol 30 (7) ◽  
Author(s):  
Jayshri Kulkarni ◽  
Neeta Kulkarni ◽  
Arpan Desai
Keyword(s):  
Monopole Antenna ◽  
Laptop Computer ◽  
Ieee 802.11A

Design of a novel triple-band monopole antenna for WLAN/WiMAX MIMO applications in the laptop computer

Circuit World ◽  
2019 ◽  
Vol 45 (4) ◽  
pp. 257-267 ◽  
Author(s):  
Jayshri Sharad Kulkarni ◽  
Raju Seenivasan
Keyword(s):  
Antenna Array ◽  
Cost Effective ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Area Network ◽  
Laptop Computer ◽  
Content Type ◽  
Laptop Computers ◽  
Triple Band

Purpose This paper aims to present a triple-band monopole antenna design of 0.2-mm thickness with an overall dimension of 21 × 8 mm2 for wireless local area network (WLAN)/worldwide interoperability for microwave access (WiMAX) multiple input and multiple output (MIMO) applications in the laptop computer. Design/methodology/approach It comprises three monopole radiating elements, namely, strip AD (inverted C), strip EG (inverted J) and strip FI (inverted U) along with two rectangular open-end tuning stubs, namely, “m” and “n” of size 1.5 × 0.9 mm2 and 1.8 × 0.9 mm2, respectively. The proposed structure is compact, cost-effective and easy to integrate inside the laptop computers. Findings This structure excites three WLAN (2.4/5.2/5.8 GHz) and three WiMAX (2.3/3.3/5.5 GHz) bands. The proposed antenna array elucidates that it has measured −10dB impedance bandwidth of 11.86 per cent (2.22-2.50) GHz in a lower band (f_l), 6.83 per cent (3.25-3.48) GHz in medium band (f_m) and 16.84 per cent (5.00-5.92) GHz in upper band (f_u). The measured gain and radiation efficiency are above 3.64dBi and 75 per cent, respectively, and isolation better than −20dB. The envelope correlation coefficient (ECC) is less than 0.004. The simulated and measured results are in good concurrence, which confirms the applicability of the proposed antenna array for MIMO applications in the laptop computer. Originality/value The proposed antenna is designed without using vias, reactive elements and matching circuits for excitation of WLAN/WiMAX bands in the laptop computers. The design also does not require any additional ground for mounting the antenna. Further, the antenna array, formed by using the same antenna design, does not need additional isolating elements and is designed in such a way that the system ground itself acts as an isolating element. The proposed antenna has a low profile and is ultra-thin, cost-effective and easy to manufacture and can be easily embedded inside the next-generation laptop computers.

Planar compact dual-band monopole antenna with circular polarization for WLAN applications

2014 ◽  
Vol 8 (1) ◽  
pp. 81-87 ◽  
Author(s):  
Jui-Han Lu ◽  
Hao-Shiang Huang
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Axial Ratio ◽  
Local Area ◽  
Monopole Antenna ◽  
Dual Band ◽  
Area Network ◽  
Ieee 802.11A ◽  
Resonant Modes

A planar circularly polarized (CP) monopole antenna (MA) with dual-band operation for the IEEE 802.11a/b/g wireless local area network (WLAN) is proposed. By introducing dual strip-sleeves shorted at the ground plane, the excitation of dual-resonant modes can resemble the 2.4/5.2 GHz bands required for WLAN operations. The obtained impedance bandwidths (RL ≧10 dB) across the operating bands approach 260/988 MHz and the 3 dB axial-ratio bandwidth of about 103/710 MHz for 2.4/5.2 GHz bands, respectively. The model proposed in this study reflects more advantages in physical implementation as its overall volume is only 40 × 40 × 0.8 mm3, 22% smaller than other conventional CP MAs. The measured peak gain and radiation efficiency are about 4.1/3.3 dBic and 94/84%, respectively, and demonstrate nearly bidirectional patterns in the XZ- and YZ-planes.

Miniaturized printed monopole antenna with applying the modified conductor-backed plane and three embedded strips based on CPW for multi-band telecommunication devices

2014 ◽  
Vol 8 (8) ◽  
Author(s):  
Mohammad Alibakhshi-Kenari
Keyword(s):  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Ground Surface ◽  
Monopole Antenna ◽  
Coaxial Cable ◽  
Dual Band ◽  
Ieee 802.11A ◽  
X Band ◽  
Printed Monopole Antenna ◽  
Printed Monopole

In this article, a new construction of a small planar dual-band fed printed monopole antenna based on coplanar waveguide is suggested. Impedance matching for dual-band operations is obtained by embedding three vertical strips with different sizes in the U-shaped conductor-backed plane. The main problem of the designed antenna is the measuring of the specifications with the Agilent 8722ES Vector Network Analyzer, when the coaxial cable is connected to the antenna. Hence, in this paper a new method for decoupling the cable from the antenna is presented. This method is based on using the ferrite bead. The ferrite bead reduces the cable radiation, so that its position plays the important part in the antenna radiation characteristics. The fabricated antenna includes the benefits of the miniaturized size and dual-band operating specifications, so that the mentioned properties have been achieved without modifying the coplanar-waveguide-ground surface or radiator patch. The antenna has the small size of 15 × 15 × 0.8 mm3and bandwidths with S11 < −10 dB about 2.2 GHz (5.05–7.25 GHz) for WLAN-band or IEEE 802.11a-band and 5.2GHz (7.6–12.8 GHz) for X-band, which correspond to 36 and 51% practical bandwidths, respectively. The antenna measured peak gains are about 1.8 dBi at WLAN-band and 4.3 dBi at X-band.

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