A compact triple band circularly polarized planar antenna for wireless application

Abstract

A compact planar triple band circularly polarized (CP) antenna loaded with parasitic elements is proposed for wireless applications. For achieving circular polarization 2 inverted L-shaped strips are added to the longer arm of dual band monopole and ground plane. A rectangular patch and a U shaped radiator are added to increase the impedance bandwidth as well as polarization purity. Electrical size of the antenna is 0.32λ × 0.32λ, where λ is the free space wavelength at its lowest CP frequency that is, 2.4 GHz. The structure shows an impedance bandwidths (│S 11 │ ≤ -10 dB) of 870 MHz (1.83-2.7 GHz), 1.17 . The 3-dB axial ratio bandwidths of the proposed structure are 12.2%, 5.3%, and 4.28% at 2.375, 3.47, and 4.9 GHz of center frequencies respectively. The proposed structure is fabricated and its parameters are measured. Measured results nearly match with the simulated results and it shows satisfactory gain in all the three operating CP bands.

Analysis and Design of a High Gain Multiband Antenna Based on Metamaterials for RFID Applications

“…However, this can lead to a deterioration in the performance of the antenna in terms of gain and directivity. Another technique [6][7][8][9][10] has been proposed to obtain a multiband antenna with smaller size, namely, to change the shape of the antenna, which can drastically reduce the amplitude of the current distribution in the radiator near the ground to suppress unbalanced current. Although these antennas have the advantage of compact size, the gain of the antennas remains very low.…”

A compact triband circularly polarized meander‐loaded monopole antenna

“…Combinations of slots and stubs are also used for multi-band CP behaviors. [14][15][16] Nevertheless, most of these reported triple-band CP antennas have large footprint, design complexity, or/and difficulty in fabrication due to multi-layer stacking. Thus, a simple and compact multi-band CP antenna is still in high demand among the research fraternity.…”

Three‐port circularly polarized MIMO antenna for WLAN application with pattern and polarization diversity

“…2 Recently, CP antenna designs have been applied to the MIMO antenna system because it provides more advantages such as the reduction in multipath interference. 3 To achieve antenna diversity in MIMO antenna systems, [4][5][6][7][8][9][10][11][12][13] have reported the use of endfire CP antenna designs by applying the ME dipole design [4][5][6][7][8][9][10][11] or vertical placement of equivalent magnetic dipoles. 12,13 To further achieving pattern and polarization diversity, a combination of both CP and linearly polarized (LP) antenna elements is proposed in References 14-16.…”