Wide‐bandwidth multifrequency circularly polarized monopole antenna for wireless communication applications

Abstract

In this article, wideband circularly polarized monopole antennas with multiresonating frequencies are presented for Bluetooth, WLAN, WiMAX, and X‐band applications. The designed antennas have dimensions of 50 × 35 × 1.6 mm3. Two different substrates (FR4‐epoxy and PTFE) are used for fabricating the antennas. The antennas consist of corner truncated I‐shaped and C‐shaped strips excited by a 50 Ω microstrip feed line. The parametric analyses are performed with the help of Ansoft HFSS V.11 EM simulator. Both antennas have been fabricated and measured. The measured percentage bandwidth of the antenna made by FR4 substrate is 31.32% (centered at 1.66 GHz), and 64.85% (centered at 5.69 GHz). The percentage bandwidth of antenna made by PTFE substrate is 20.57% (centered 2.43 GHz) and 68.74% (centered at 7.39 GHz). In addition to that, there exists 3 dB AR bandwidth for LHCP of about 1050 MHz for 5.2 GHz WLAN‐band. The reflection coefficient, radiation patterns, and the gains of both the antennas are studied in detail. It is found that the measured and simulated results are in good agreement.

A Compact Dual Band Dual Polarized Monopole Antenna With Enhanced Bandwidth for C, X, and Ku Band Applications

“…Their CP characteristics also help in effectively combatting multipath interference or fading. To satisfy these requirements of DBDP antennas showing both linear and circular polarizations, different techniques have been utilized by various researchers [4][5][6][7]. An asymmetric dipole like radiator coupled with a T-shaped feed line having wide ground plane slot was used [4] to obtain dual-band characteristics.…”

“…Additionally, I-shaped resonator (ISR) arrays were used to enhance gain of the antenna. Recently, another group [6] used two planar multiband monopole antennas (using two different substrates, viz. FR4-epoxy and PTFE) to provide LP in lower band and CP in upper band.…”

Dual‐band dual‐polarized compact planar monopole antenna for wide axial ratio bandwidth application

“…However, these antennas are complicated nonplanar structures with small axial ratio bandwidth (ARBW). To design simple and compact structures which can be easily embedded in front end devices, various kinds of slot and planar monopole structures using CPW or microstrip‐line feeding techniques have been proposed for designing dual‐polarized antennas. CPW‐fed open‐ended slotted ground plane or L‐shaped monopole with parasitic resonator and grounded stub are used for achieving DP.…”

“…Dual‐band or triple‐band slot antennas based on microstrip‐line feeding have been proposed in References and for adopting DP characteristics in a single antenna. Moreover, the microstrip feeding technique has been adopted in planar monopole structures to widen the ARBW or to increase the number of frequency bands with DP characteristics.…”

“…So, dual band antennas with linear and circular polarization in two distinct frequency bands are much popular over two orthogonal polarizations in two different bands for DBDP antennas. To fulfill these requirements of DBDP antennas with linear and circular polarization, various techniques have been adopted by the researchers in References [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Stack patch antennas have been introduced in References 5 and 6.…”