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 novel-shaped dual-band circularly polarized (CP) monopole antenna is proposed. Two parasitic strips are fabricated under the unique shaped monopole element to get dual broad operation bands. The proposed antenna is fabricated on the FR4 substrate with the specification of the substrate dimension 40 mm  30 mm, ε r ¼ 4:4, h ¼ 1:6 mm, and loss tangent tan δ ¼ 0:02. The parasitic elements are responsible to improve the current distribution I x and I y on the surface. Two CP modes are developed for orthogonally distributions of E x and E y fields with same magnitude. All the successive CP modes are merged, and a broad AR BW is achieved. The RHCP and LHCP waves radiate along the broadside direction at the lower and higher frequency bands. The achieved two impedance bandwidth and axial ratio (AR) bandwidth are 1.5 GHz (7.05-8.55 GHz), 4.45 GHz (11.65-16.1 GHz) and 1.4 GHz (7.1-8.5 GHz), 0.2 GHz (14.6-14.8 GHz). A very good gain response along with two peak gains of 5.5 dBi and 5.9 dBi is achieved. The proposed antenna is applicable for International Telecommunication Union (ITU) satellite communication and (14-14.5 GHz).
Summary
In this paper, a simple wideband circularly polarized monopole antenna for different wireless and satellite communication applications is proposed. The top plate of the antenna is composed of an isosceles trapezoidal patch with an inverted L‐shaped strip connected along with this. The bottom side (ground plane) has been modified by embedding two right‐angle triangular stubs for enhancing the impedance and CP performances. The proposed antenna is designed and fabricated on commercially available FR4 substrate occupying the volume of 0.525λ₀ × 0.42λ₀ × 0.0168λ₀. The −10‐dB reflection coefficient bandwidth exhibits two wide bands of 1530 MHz (2.6 GHz to 4.13 GHz) and 2040 MHz (6.93 GHz to 8.97 GHz). The measured 3‐dB AR bandwidth is 1800 MHz (6.6 GHz to 8.4 GHz), covering International Tele‐communication Union for satellite communication bands (uplink and downlink). In addition, the proposed monopole antenna has also provided good gain ≥5dBi for both the bands.
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