Wideband circularly polarized cross‐dipole antenna with parasitic metallic cuboids

Abstract

A broadband circularly polarized (CP) cross‐dipole antenna with parasitic ground strips is designed. The antenna is composed of cutting‐off elliptical arms as driven element, four rotated grounded metal cuboids as parasitic element and a square ground plane as reflector. A pair of vacant‐quarter printed rings are adopted to feed the antenna by a sequential rotated way, which could excite 90° phase difference for achieving CP radiation. Note that the parasitic metal cuboid is directly connected to the ground plane and there is no air between them. The broadband CP operation could be realized through utilizing these elements to stimulate multiple CP resonances. The measured results reveal the proposed antenna features a broad IBW of 103.3% (1.01‐3.17 GHz), and a wide ARBW of 86.4% (1.25‐3.15 GHz), which could meet the need of broadband communication.

Wideband Circularly Polarized Microstrip-Slot Antenna with Parasitic Ground Planes

“…Currently, a pair of orthogonal vacant-quarter fabricated rings as sequentially-rotated feeding structures has been extensively used in the design of crossed-dipole CP antennas, which can provide a stable 90 °phase diference to achieve CP operation. Based on the feeding structure, many diferent shapes of crossed-dipole antennas are presented to obtain broadband CP radiation [20][21][22][23][24][25][26]. Tese shapes of crossed-dipole involve liner [20], rectangular [21], stepped rectangular [22], metallic cuboids [23], L-shaped [24], elliptical [25], and asymmetric bowtie [26] cross-dipoles, which are designed in turn to obtain wide 15.6%, 27%, 55.1%, 86.4%, 67.5%, and 96.6% of 3-dB ARBW, respectively.…”

“…Based on the feeding structure, many diferent shapes of crossed-dipole antennas are presented to obtain broadband CP radiation [20][21][22][23][24][25][26]. Tese shapes of crossed-dipole involve liner [20], rectangular [21], stepped rectangular [22], metallic cuboids [23], L-shaped [24], elliptical [25], and asymmetric bowtie [26] cross-dipoles, which are designed in turn to obtain wide 15.6%, 27%, 55.1%, 86.4%, 67.5%, and 96.6% of 3-dB ARBW, respectively. However, the profle of the cross-dipole antenna is too high due to the presence of a quarter wavelength grounded refector, which is not suitable for low-profle applications.…”

Broadband crossed dipole circularly polarized antenna with parasitic round‐metal pillars

“…Besides, loading parasitic elements is also a very effective means for widening CP bandwidth of cross-dipole antennas. [11][12][13][14][15][16][17][18][19][20][21][22] These parasitic elements include double split-ring resonators (7.93%, 59.15%), 11 rotated-circular dipoles (41.3%), 12 asymmetrical cross-loop (53.4%), 13 asymmetric L-shaped strips (52.2%), 14 triangle-patches (58.9%), 15 four inverted L-shaped elements (83.5%), 16 a trapezoidal-dipole (63.4%), 17 dualsquare cavity ground (66.7%), 18 rotated grounded metal cuboids (86.4%), 19 shorted coupled pads (85.5%), 20 a slotbowtie cross-dipole (90.9%), 21 and four rotated metallic plates (106.1%). 22 Moreover, the CP bandwidth of the crossdipole antennas could be enhanced through combing the parasitic elements with modified dipoles.…”