Abstract
A meander stripline feed multiband microstrip antenna loaded with metasurface reflector (MSR) structure has been designed, analyzed and constructed that offers the wireless communication services for UHF/microwave RFID and WLAN/WiMAX applications. The proposed MSR assimilated antenna comprises planar straight forward design of circular shaped radiator with horizontal slots on it and 2D metasurface formed by the periodic square metallic element that resembles the behavior of metamaterials. A custom made high dielectric bio-plastic substrate (ε r = 15) is used for fabricating the prototype of the MSR embedded planar monopole antenna. The details of the design progress through numerical simulations and experimental results are presented and discussed accordingly. The measured impedance bandwidth, radiation patterns and gain of the proposed MSR integrated antenna are compared with the obtained results from numerical simulation, and a good compliance can be observed between them. The investigation shows that utilization of MSR structure has significantly broadened the -10dB impedance bandwidth than the conventional patch antenna: from 540 to 632 MHz (17%), 467 to 606 MHz (29%) and 758 MHz to 1062 MHz (40%) for three distinct operating bands centered at 0.9, 3.5 and 5.5 GHz. Additionally, due to the assimilation of MSR, the overall realized gains have been upgraded to a higher value of 3.62 dBi, 6.09 dBi and 8.6 dBi for lower, middle and upper frequency band respectively. The measured radiation patterns, impedance bandwidths (S11<-10 dB) and gains from the MSR loaded antenna prototype exhibit reasonable characteristics that can satisfy the requirements of UHF/microwave (5.8 GHz) RFID, WiMAX (3.5/5.5 GHz) and WLAN (5.2/5.8 GHz) applications.
Highlights
In recent days, the microstrip patch antennas of low-profile, inexpensive, compact, multiband, easy and simple design structure have gained considerable research attention due to their effective utilization in developing portable wireless communication devices [1]
The antenna as a vital component of any communication module that resides at the center of the state-of-the-art of multi-functionalities, it is always requested to design a multiband antenna with wide bandwidth, adequate gain and stable radiation patterns to integrate with the modern multi-purpose wireless devices [2]
The microstrip patch antennas are excellent contestant to serve the functions, narrow bandwidth, inadequate radiation properties and inappropriate gain function of the conventional microstrip patch antennas restrict them from various wireless communication systems
Summary
The microstrip patch antennas of low-profile, inexpensive, compact, multiband, easy and simple design structure have gained considerable research attention due to their effective utilization in developing portable wireless communication devices [1]. Some researchers have investigated the utilization of partial reflective surface for improving the antenna performance For such technique, it is reasonably required to maintain a minimum of λ/2 (in terms of resonant frequency) Fabry-Perot resonant cavity between the metallic ground plane and reflective surface. It is reasonably required to maintain a minimum of λ/2 (in terms of resonant frequency) Fabry-Perot resonant cavity between the metallic ground plane and reflective surface This technique provides very low bandwidth due to the preservation of high quality factor which restrict the antenna from many applications [9]. The designing of the MSR integrated multiband patch antenna includes: the geometrical structure of the antenna (radiating patch and the ground plane) and the architecture of the MSR, which are discussed below with details parametric investigations
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