A Compact Dual-Band Antenna With Omnidirectional Radiation Pattern

A single-port dual-band antenna integrated with solar cells is reported for the 2.4/5-GHz wireless local area network (WLAN) applications. Thirty solar cells are adopted and integrated into the antenna structure for both energy harvesting and wireless communication. The solar cells can act as a director for the lower band, and the main radiation structure for the higher band. The slot and microstrip antennas are incorporated into the compact structure and multiple resonant modes are utilized for dual-band performance. The measurement results show that the lower band is from 2.27 to 2.5 GHz with an omnidirectional radiation pattern and the upper band is from 4.8 to 6.9 GHz with a directional radiation pattern. The proposed solar cell antenna can provide a dual-band performance with the ability of DC power generation, which can be a potential candidate for future green low-carbon communication.

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A Compact Dual-Band Planar Monopole Antenna Using Fractal Rings and A Y-Shaped Feeding Transmission Line

Frequenz ◽

10.1515/freq-2018-0097 ◽

2019 ◽

Vol 73 (1-2) ◽

pp. 25-36

Author(s):

Kahina Djafri ◽

Mouloud Challal ◽

Jordi Romeu

Keyword(s):

Transmission Line ◽

Radiation Pattern ◽

Impedance Matching ◽

Ground Plane ◽

Monopole Antenna ◽

Dual Band ◽

Laptop Computer ◽

Rectangular Slot ◽

Dual Band Antenna ◽

Band Characteristic

Abstract This paper presents a novel design approach of a compact dual-band monopole antenna with an overall size of 18.9x13x1.6mm3. The proposed antenna is composed of a fractal ring shaped patch fed by a Y-shaped transmission line on the top side of the substrate and a second fractal ring along with a U-shaped ground plane on the bottom side. The second fractal ring, identical to the radiating ring, is loaded and a rectangular slot is etched at the top side of the ground plane respectively, to achieve dual-band characteristic and improve the impedance matching. The effect of standard ground-plane (SGP) of a laptop computer is incorporated in the design; the antenna is mounted on a SGP in order to investigate its performance. The antenna covers widely the frequency bands of the WLAN 2.4 GHz (2.2–2.52 GHz) and WiMAX 3.5 GHz (3.32–4.35 GHz), and exhibits an omnidirectional radiation pattern in the H-plane and a monopole like radiation pattern in the E-plane. A good agreement between the simulated and measured results indicates that the proposed dual-band antenna design is suitable for WLAN/WiMAX applications.

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A Dual-band Planar Antenna for Wireless Local Area Network Applications

Polytechnic Journal ◽

10.25156/ptj.v9n2y2019.pp105-111 ◽

2019 ◽

Vol 9 (2) ◽

pp. 105-111

Author(s):

Yasser A. Fadhel

Keyword(s):

Reflection Coefficient ◽

Radiation Pattern ◽

Wireless Local Area Network ◽

Local Area Network ◽

Local Area ◽

Dual Band ◽

Handheld Devices ◽

Area Network ◽

Network Applications ◽

Dual Band Antenna

Wireless local area network (WLAN) communication is one of the fast and secure wireless technologies, which is vastly used in nowadays portable and handheld devices. This paper is oriented on designing of a planar WLAN antenna to serve in WLAN network devices. The designed antennas are single and dual-band planar monopole antennas to be working at IEEE 802.11 WLAN frequencies; 2.45 GHz and 5.2/5.8 GHz bands. Different configurations have been used in the design process, especially for the dual-band antenna, where dual-resonant is required. The antennas have been designed analytically then simulated using the CST software package. Simulation results for the input reflection coefficient, realized gain, and radiation pattern have been considered to evaluate their features. The antennas have also been fabricated practically and practical measurements for the input reflection coefficient and radiation pattern have been taken which shown a good agreement with those of simulation.

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A compact omnidirectional to directional frequency reconfigurable antenna for wireless sensor network applications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000994 ◽

2021 ◽

pp. 1-12

Author(s):

Melvin Chamakalayil Jose ◽

Radha Sankararajan ◽

Balakrishnapillai Suseela Sreeja ◽

Mohammed Gulam Nabi Alsath ◽

Pratap Kumar

Keyword(s):

Wireless Sensor Network ◽

Sensor Network ◽

Radiation Pattern ◽

Antenna System ◽

Wireless Sensor ◽

Dual Band ◽

Design Parameters ◽

Pin Diodes ◽

Band Frequency ◽

Directional Radiation

Abstract In the proposed research paper, a novel compact, ultra-wideband electronically switchable dual-band omnidirectional to directional radiation pattern microstrip planar printed rectangular monopole antenna (PRMA) has been presented. The proposed antenna system has an optimum size of 0.26 λ0 × 0.28 λ0. A combination of radiators, reflectors, and two symmetrical grounds does place on the same layer of the rectangular microstrip PRMA. The frequency agility and the radiation pattern from omnidirectional to directional are achieved using two SMD PIN diodes (SMP1340-04LF). The directional radiation patterns with 180° phase shifts are achieved at the C-band frequency spectrum. The parametric study of the proposed antenna system was performed for different design parameters, and the antenna characteristics were analyzed. An antenna prototype is fabricated using the printed circuit board etching method by using RMI UV laser etching and cutting tools. The measurements of the proposed antenna are conducted in an anechoic chamber to validate the simulations. There are three states of operations due to two SMD PIN diodes being used in switching circuits. In state-I, the proposed antenna radiates at 6.185 GHz (5.275–6.6 75 GHz) in the Ф = 270° direction with a gain of 2.1 dBi, whereas in state-II, it radiates at 5.715 GHz (5.05–6.8 GHz) in the Ф = 90° direction with a gain of 2.1 dBi. In state-III, the antenna exhibits the X-band frequency with center frequency at 9.93 GHz (8.845–10.49 GHz), and the omnidirectional pattern offers a gain of 4.1 dBi. The features of the proposed antenna are suitable for high-speed wireless sensor network communication in industries such as chemical reactors in oil and gas and pharmaceuticals. It is also well suited for IoT and 5G-sub-6-GHz applications.

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