WiMAX Antenna Research Articles

Design of Printed CPW-fed Monopole Antenna for WiMAX and WLAN Dual Band-Notched Characteristics for UWB Applications

Design of Printed CPW-fed Monopole Antenna for WiMAX and WLAN Dual Band-Notched Characteristics for UWB Applications

Compact wideband MIMO antenna for 4G WI-MAX, WLAN and UWB applications

This article proposes a compact wideband MIMO antenna. The antenna comprises of two identical modified P shaped monopole radiators, spatially oriented at 180° to each other with side to side spacing of 0.075λo, where λo is the wavelength corresponding to the lowest operating frequency. To design a compact antenna, a semicircular monopole with a rectangular strip is designed instead of a circular monopole. This P shaped monopole antenna offers same impedance bandwidth with 50% size reduction. To enhance the impedance bandwidth of the antenna, the effective current path length is increased by introducing two semi-circular slots in P shaped monopole antenna. To achieve the desired impedance bandwidth of 2.5–12 GHz, the rectangular strip is corrugated on both sides in the slotted P shaped monopole. Triangular slots and meshed metal strip are introduced in the ground plane to achieve high mutual coupling over wideband. The triangular slots act as variable length capacitance and exhibits wide band notch characteristics. A meshed metal strip acts as decoupling structure for the surface current emerging from the surface waves and also act as reflector for space waves. Those bands which are not rejected by triangular slots, are notched by meshed metal strips. Thus by employing both triangular slots and meshed metal strip, isolation >20 dB is achieved over 2.5–12 GHz. The proposed antenna is a novel design which has smaller dimensions and still offers isolation >20 dB over a wider impedance bandwidth of 2.5 GHz to 12 GHz as compared to state of art antenna structures reported in literature. The band stop characteristics of proposed isolation techniques are analyzed by suspended stripline method. Mutual coupling reduction is also analyzed with the help of vector surface current density and magnetic field distribution. The proposed structure has compact dimensions of 0.25 λ0 × 0.241 λ0. The fabricated prototype antenna exhibits envelope correlation coefficient (ECC) >0.02, diversity gain >9.5 dB and stable radiation patterns. The antenna is suitable for 4G WI-MAX, WLAN and UWB applications.

A Dual-Band Printed Slot Antenna for WiMAX and Metrological Wireless Applications

New microstrip antenna initiated from the portions of 1st order structures of Sierpinski square geometry is modeled in this paper as quasi-fractal device using an FR4 substrate of 4.4 dielectric constant, 1.6 mm thickness and 0.02 loss tangent. The intended microstrip antenna is designed for band frequencies of 3.5 and 7.8 GHz for WiMAX and metrological satellite applications with a bandwidth of 0.66 and 0.78 GHz for each band respectively. The designed antenna has considerable compact size that is smaller than many reported fractal and non-fractal antenna structures in the literature. Also, it has interesting return loss and radiation results that can be employed in diverse wireless devices. Measured input reflection coefficient, radiation patterns and gain results have been found in good agreement with those predicted by simulations.

Design of Multiband Antenna for Wimax and WLAN Applications Using DGS

In this paper, a multiband antenna with a micro strip feed line is presented. This antenna is designed on FR4 substrate with dielectric constant 4.4 having overall size of 20 × 20 × 1.6mm3. The proposed antenna comprises defected ground structure with T and L shape slots to achieve multiband frequencies. This multiband antenna covers three different frequencies as 3.3 GHz, 3.85 GHz and 5.25 GHz. All of these frequencies are applicable for WiMAX and WLAN applications respectively. Return loss (S11), Gain and Radiation patterns are simulated and observed on HFSS.

A multi-band switchable antenna for Wi-Fi, 3G Advanced, WiMAX, and WLAN wireless applications

AbstractThis paper presents a hexa-band frequency reconfigurable planar antenna, printed on a 1.6 mm thicker FR 4 substrate and backed by a truncated ground plane. The given antenna operates in four different frequency modes, depending on the state of the two lumped element switches. The proposed antenna works at six frequencies, 2.10, 2.40, 3.35, 3.50, 5.28, and 5.97 GHz. These frequency bands are dedicated to useful wireless applications, including 3G Advanced (2.10 GHz), Wireless Fidelity (Wi-Fi) (2.40 GHz), WiMAX (3.35 GHz), WiMAX (3.5 GHz), WLAN (5.28 GHz) and fixed-satellite and mobile satellite services (5.97 GHz). Satisfactory gain of 1.96, 2.20, 2.671, 2.81, 3.80, and 3.88 dBi, efficiency of 92.5, 94.5, 94.56, 95.0, 93.8, and 97.0% and bandwidth of 332, 485, 1020, 1080, 512, and 465 MHz has been obtained at 2.10, 2.40, 3.35, 3.50, 5.28, and 5.97 GHz, respectively. The modeling and simulations are conducted in CST MWS (2014). The simulated reflection coefficient and radiation pattern are validated in antenna measurement facility. In addition, the specific absorption rate of the antenna on a flat section of human body is also studied. The antenna is compact, low profile, and vastly suitable for multi-band wireless devices.

A triple‐band highly miniaturized antenna for WiMAX/WLAN applications

AbstractA novel highly miniaturized triple band antenna for WiMAX and WLAN applications is presented in this letter. The proposed design has an active patch area of only 108 mm2 (9 × 12 mm2), and operates at 2.5 (lower WiMAX), 3.47 (middle WiMAX) and 5.75 GHz (WLAN), respectively. Miniaturization in the proposed design is accomplished by etching 2 novel cascaded E‐type unit cell defected ground structure in conjunction with the F‐shaped slot, and multiband operations are achieved by etching U and H‐type slots in the radiating monopole. The miniaturization process leads to the reduction of about 82.4% and 73.5% in the active patch area and volume of the proposed antenna respectively, as compared with the conventional designed triple band antenna. The antenna has a compact volume of 0.15 λ0 × 0.15 λ0 × 0.01 λ0 at a lower resonance of 2.6 GHz. The proposed structure has S11<–10 dB bandwidth of about 6.45% (2.55–2.72 GHz), 3.03% (3.25–3.35 GHz) and 5.9% (5.75–6.1 GHz) in simulation, and about 4.2% (2.51–2.62 GHz), 2.31% (3.42–3.50 GHz), and 4.81% (5.68–5.96 GHz) under measurement, respectively. Stable radiation characteristics and good impedance matching are observed across the operational bandwidth of the proposed design.

Design of a Multiband Patch Antenna for 5G Communication Systems

Currently, communication system requires multiband small antennas for 5G mobile applications. Driven this motivation, this paper proposes a multiband patch antenna for Wi-Fi, WiMAX and 5G applications. The proposed antenna can effectively operate at 2.4 GHz as Wi-Fi, 7.8 GHz as WiMAX and 33.5 GHz as 5G communication purposes. The proposed antenna arrays have given directional radiation patterns, very small voltage standing wave ratio, high gain (VSWR) and directivity for each aforementioned systems operating frequency. This antenna is made for multiband purpose which can be effective for not only Wi-Fi and WiMAX but also 5G applications.

Bandwidth enhancement of monopole antenna with DGS for SHF and reconfigurable structure for WiMAX, WLAN and C-band applications

In this study a reconfigurable antenna for WiMAX, WLAN, C-bands and SHF applications has been presented. The main body of antenna includes rectangular and L-shaped slotted ground plane and a rectangular patch with slotted feed line, for impedance bandwidth enhancement. In the proposed antenna, a PIN diode is used to adjust the frequency band to SHF, WiMAX, WLAN and C-bands applications. When PIN diode is forward-biased, the antenna covers the 3.5–31 GHz frequency range (i.e. a 160% bandwidth) and when the PIN diode is in its off-state, it operates between 3.4–5.8 GHz. The designed antenna, with a very small size of 12 × 18 × 1.6 mm3, has been fabricated and tested. The radiation pattern is approximately omnidirectional. Simulations and experimental results are in a good agreement with each other and suggest good performance for the presented antenna.

Design of Multi-band Microstrip Antenna for Wireless Communications and ITU Applications

A multi-band microstrip patch antenna for WiMAX, WLAN and ITU-Region1 applications is presented in this letter. The proposed antenna consists of FR4 substrate with dimensions of 15 × 15 × 1.6 mm3, ground plane and radiation patch that fed by 50 Ω microstrip line. This antenna with two symmetry of L-shape and U-shape slots and folded strip lines in the configuration of radiation patch, cover 3.5 GHz frequency for WiMAX, two 5.2 and 5.8 GHz frequencies bands for WLAN and 4.3 GHz for ITU-Region1 applications to consider simulated and measured results. The omnidirectional radiation pattern characteristics and −10 dB return loss for all frequencies bands are obtained in this antenna.

Design of frequency reconfigurable multiband compact antenna using two PIN diodes for WLAN/WiMAX applications

In this study, the authors present a simple reconfigurable multiband antenna with two PIN diode switches for worldwide interoperability for microwave access (WiMAX)/wireless local area networks (WLAN) applications. The antenna permits reconfigurable switching in up to ten frequency bands between 2.2 and 6 GHz, with relative impedance bandwidths of around 2.5 and 8%. The proposed antenna has been simulated using computer simulation technology microwave studio software and fabricated on an FR-4 substrate. It is compact, with an area of 50 × 45 mm 2 , and has a slotted ground substrate. Both measured and simulated return loss characteristics of the optimised antenna show that it satisfies the requirement of 2.4/5.8 GHz WLAN and 3.5 GHz WiMAX antenna applications. Moreover, there is good agreement between the measured and simulated results in terms of radiation pattern and gain.

Dual-slot based Rectangular Microstrip Antenna for WiMAX, WCS and C-band Satellite Applications

Dual-slot based Rectangular Microstrip Antenna for WiMAX, WCS and C-band Satellite Applications

Compact Size and Slotted Patch Antenna for WiMAX and WLAN

Objectives: Dual-Band, reduced size, coaxial fed probe, Inverted C-slot patch antenna for wireless communication is designed in this paper. The excellent dual-band performance is attained by using inverted C-slots on the patch. Methods/Statistical Analysis: The slots provide two notched bands covering 2.7 GHz to 4.04 GHz for WiMAX and 5.32 GHz to 6 GHz for WLAN with excellent return loss and satisfactory VSWR. Findings: Two resonant peaks obtained are at 3.2 GHz and at 5.4 GHz. The proposed antenna size is 29 mm × 29 mm. The antenna has been effectively simulated on HFSS and tested on VNA tool. The peak gain of 4.65 dB and efficiency of 95% is obtained. The antenna presentation is analyzed on the basis of size of antenna, VSWR, bandwidth, return loss and efficiency. The presented antenna is an excellent choice for WLAN and WiMAX. Improvements: As compared to conventional Microstrip Patch Antenna return loss is improved with 67% and area minimization of 63% has been attained.

Compact and broadband dual sleeve monopole antenna for GSM, WiMAX and WLAN application

This paper presents a dual sleeve monopole antenna that covers Global System for Mobile Communications (GSM), worldwide interoperability microwave access (WiMAX), and wireless local area network (WLAN) frequency bands. This new antenna is more wideband and compact structure in compare to other works. Simulation is done by Ansoft HFSS14 and results show the proposed omnidirectional antenna, ranging from 360 MHz to 5.1 GHz that bandwidth is 174% for return loss below −10 dB. The height of structure is 0.16 λ that has been achieved size reduction about 35% in compare to conventional monopole antenna with height 0.25 λ. These characterizations make this antenna very beneficial for jammer application. Jammers make places more secure and comfortable by reducing cell phones disruptions from some public places. The prototype of this structure has been made and the measure results are in good agreement with simulation results. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1271–1277, 2017

Novel patch antenna for multiband cellular, WiMAX, and WLAN applications

Novel patch antenna for multiband cellular, WiMAX, and WLAN applications

Wideband stacked maltese cross‐shaped DR antenna for WiMAX and WLAN applications

A new maltese cross-shaped dielectric resonator (DR) antenna is presented and analysed as a wideband radiator. The antenna comprises of maltese cross-shaped DR, arranged in a stacked configuration and centrally fed by a coaxial probe. The proposed antenna radiates such as an electric monopole, generating omnidirectional linearly polarised fields. Three modes: namely, TM01δ , TM02δ , and TM03δ are simultaneously excited and merged in the composite structure to obtain a wide bandwidth of 59.5% [for voltage standing wave ratio≤2], covering frequency range from 3.15 to 5.82 GHz. The radiation pattern of the proposed antenna is fairly stable throughout the operating band with the measured peak gain varies from 3.27 to 6.09 dBi. A prototype of the proposed antenna is built and tested. Both the simulations and experimental results are presented and discussed. The proposed antenna is suitable candidate for worldwide interoperability for microwave access (3.5 GHz) and wireless local area network (3.65 GHz/4.9 GHz/5 GHz) applications. Moreover, it can also be used for lower European ultra-wideband frequency band (3.4–5 GHz) applications.

A Compact, Tri-Band and 9-Shape Reconfigurable Antenna for WiFi, WiMAX and WLAN Applications

This paper introduces a novel 9-shaped multiband frequency reconfigurable monopole antenna for wireless applications, using 1.6 mm thicker FR4 substrate and a truncated metallic ground surface. The designed antenna performs in single and dual frequency modes depending on switching states. The antenna works in a single band (WiMAX at 3.5 GHz) when the switch is in the OFF state. The dual band frequency mode (Wi-Fi at 2.45 GHz and WLAN at 5.2 GHz) is obtained when the switch is turned ON. The directivities are: 2.13 dBi, 2.77 dBi and 3.99 dBi and efficiencies: 86%, 93.5% and 84.4% are attained at frequencies 2.45 GHz, 3.5 GHz and 5.2 GHz respectively. The proposed antenna has VSWR< 1.5 for all the three frequencies. The scattering and far-field parameters of the designed antenna are analyzed using computer simulation technology CST 2014. The performance of the proposed antenna is analyzed on the basis of VSWR, efficiency, gain, radiation pattern and return loss.

Design of compact multiband pattern diversity antenna for WiMax, LTE and WLAN applications

A compact multiband pattern diversity antenna for Multiple input multiple output (MIMO) applications is being proposed. The pattern diversity antenna is designed for 2.6 GHz LTE, 3.5/5.5 GHz WiMax, 3.3 GHz MIMO and 5.2 GHz WLAN applications for mobile devices. The compact size of the MIMO antenna (41.05 × 21.1 mm) is due to having compact individual monopole antennas each of dimension 17.5 × 10 mm. A T-shaped and inverted L-shaped stub in the ground plane reduces mutual coupling due to near field whereas slots introduced in the ground plane prevents current to flow through the common ground plane. The important characteristics of MIMO antenna like diversity gain and envelope correlation coefficient have also been presented. Measured and simulated radiation patterns presented show that the MIMO antenna proposed provide pattern diversity.

CPW-fed slotted CANTOR Set fractal antenna for WiMAX and WLAN applications

This paper presents the behavior of three iterations of a coplanar waveguide fed CANTOR Set fractal antenna. This kind of antennas allows having a broadband behavior and important gains. Also, the setup of slots allows having more lower resonant frequencies and therefore designing miniaturized antennas with good performances. The proposed antennas are suitable for 2.5/3.3/5/5.5 GHz worldwide interoperability for microwave access and for 2.4–2.5/4.9–5.9 GHz wireless local area networks applications. The simulations were performed in FEKO 6.3. The measurements were performed with Vector Network Analyzer HP 8719C.

Compact MIMO antenna for Bluetooth, WiMAX, WLAN, and UWB applications

ABSTRACTThis paper presents a compact multiple‐input‐multiple‐output (MIMO) antenna for wireless portable device applications. It entirely covers the Bluetooth (2.4–2.484 GHz), Worldwide Interoperability for Microwave Access (WiMAX) (3.4–3.69 GHz), Wireless Local Area Network (WLAN) (5.15–5.825 GHz), and ultra‐wideband (UWB) (3.1–10.6 GHz) operating bands. This antenna consists of two planar polygon printed monopole(PM) antennas, a rectangular slot and a triangular trim on the antenna element to lower down the low‐cutoff frequency for improving the impedance matching, and a stepped ground stub to improve the isolation. Two rounded corners are simultaneously used on the ground for the impedance matching at medium‐high frequency. The results of simulation and measurement prove that the −10 dB bandwidth of this antenna is from 2.4 to 11 GHz, and the isolation is less than −15 dB in the entire band, which can satisfy the actual requirements according to most literatures. The envelope correlation coefficient is less than 0.02. The size of this antenna array is 40 × 36 mm2. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:783–787, 2016

A metamaterial based tri‐band antenna for WiMAX/WLAN application

ABSTRACTThis article presents a metamaterial‐based tri‐band antenna for WiMAX (2.5/3.5/5.5 GHz) and WLAN (5.2/5.8 GHz) application. The antenna comprises of a metallic patch of area 22 mm × 14 mm on the top of a substrate. The patch is etched with a T‐shaped slot and meandered lines. At the bottom of substrate we have a partial, rectangular shaped ground plane along with an electric‐inductive‐capacitive resonator. The proposed antenna gives a desired impedance bandwidth along with an omnidirectional radiation pattern. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:558–561, 2016