Broadband Dual Circularly Polarized Substrate Integrated Waveguide Antenna

Dual Circularly Polarized Substrate Integrated Waveguide Cavity-Backed Antenna With Enhanced Bandwidth and Reduced Size for Wideband Wireless Applications

“…The selected criteria for inclusion in this comparison are newly published unidirectional dual-CP/RHCP antennas. Compared with the dual-CP antennas presented in [4][5][6][7][8][9][10], the proposed antenna obtains a much wider effective dual CP bandwidth, without sacrificing the antenna profile performance significantly. Meanwhile, though the RHCP antenna presented in [11] has an advantage on the proposed antenna in effective CP bandwidth, its antenna profile is much higher than that of the proposed antenna.…”

“…Unidirectional dual circularly polarized (CP) antennas have attracted great attention due to their merits of capabilities of reducing polarization mismatch, suppressing multipath interference, realizing unidirectional radiation with higher gain, increasing the channel capacity and link robustness, and enhancing frequency reuse [1][2][3][4][5][6][7][8][9][10][11]. Meanwhile, dual CP substrate integrated waveguide (SIW) cavitybacked antennas have the inherent advantage of mitigating the effect of unexpected electromagnetic interference in the installment environment due to their self-consistent electrical shielding.…”

“…Meanwhile, dual CP substrate integrated waveguide (SIW) cavitybacked antennas have the inherent advantage of mitigating the effect of unexpected electromagnetic interference in the installment environment due to their self-consistent electrical shielding. Though the feature of broad 3 dB axial ratio (AR) bandwidth is becoming increasingly necessary due to the high data rate required by modern services, many newly published unidirectional dual-CP antennas in [4][5][6][7][8][9][10] only support relatively narrow-band applications. In [4], a dual CP SIW antenna consisting of a quarter-mode SIW cavity, two open stubs, and defected ground structures is presented, and it obtains an effective dual CP bandwidth of 11.2% and a much lower profile of 0.03λ 0 .…”

“…In [6], a dual CP planar four-port aperture antenna with an effective dual CP bandwidth of 17.2% for 60 GHz applications is introduced. Moreover, a dual CP SIW cavity-backed patch antenna using a two-layer structure is presented in [7], while it has a limited effective dual CP bandwidth of 3.4%. In [8], a dual CP microstrip antenna is proposed, and it obtains a wider effective dual CP bandwidth of 19.4% by employing a novel vertically coupled resonator-based structure and the intrinsic 90 • phase difference between two coupling paths.…”

Dual‐functional QM SIW cavity integrating two‐element MIMO antenna and second‐order bandpass filter

“…Over the years, some excellent antennas and filters have been reported in the literature. Frequency‐tunable, 6 circularly polarized, 7 beam‐switchable, 8 and two‐element multiple‐input‐multiple‐output (MIMO) 9 antennas based on QM SIW cavities have been proposed. On the other hand, second‐order, 10 dual‐band, 11 and wideband 12,13 bandpass filters have also been investigated.…”