Figure - available from: International Journal of Antennas and Propagation
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E - and H-plane radiation patterns of the antennas at different frequencies with black solid lines for Vivaldi 1 copolarization, red solid line for Vivaldi 2 copolarization, black short dash line for Vivaldi 1 cross-polarization, and red short dash line for Vivaldi 2 cross-polarization.
Source publication
An X-band dual-polarized Vivaldi antenna with high isolation is proposed. The procedure of this antenna design includes the conventional Vivaldi antenna with regular slot edge (RSE), the dual-polarized Vivaldi antenna with two Vivaldi antennas which have different feeding point positions in a cross-shaped form, and the two Vivaldi antennas with a g...
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Broadband dual‐polarized base station antenna requires wide impedance matching bandwidth, high‐polarization isolation, stable radiation patterns, small gain variations, and high‐cross polarization discrimination level. For antenna designers, it usually takes much computational time to design broadband base station antenna because there are extensiv...
Citations
... where N is the number of elements in the array. For the particular case when N = 4, (4) can be rewritten as (5). ...
In this article, a 4‐port multiple input, multiple output (MIMO) antenna array is presented, based on a Vivaldi design for nonplanar applications like access points above 6 GHz. The antenna is configured with four Vivaldi antennas arranged orthogonally, one to each other, to increase the electromagnetic isolation among elements. The Vivaldi element is fed with a microstrip with an integrated balun in only one arm, and each arm is set in an antipodal position to the other, giving an easy‐to‐design and build prototype, with no complicated feeding techniques. Each antenna plane has dimensions of 90 × 40 mm². The array presents a bandwidth from 5.3 GHz to beyond 20 GHz, with electromagnetic isolation above 20 dB, an envelope correlation coefficient below 0.001 for the entire bandwidth, giving a diversity gain around 20 dB, and a total active reflection coefficient below −10 dB from 7 to 20 dB, fulfilling the metrics for MIMO applications.
... In recent years, a wideband and low-profile antenna with an end-fire radiation pattern has attracted much attention because of the high demand in modern wireless communication and radar areas [1][2][3][4][5]. Many high-performance end-fire antennas have been reported, especially the newest designs published in the past several years, like the monocone quasi-Yagi antenna [6,7], log-periodic slot antenna [8], SIW H-plane ridged antenna [9][10][11], Vivaldi antenna [12,13], surface wave antenna [14,15], and low-profile log-period monopole antenna [16,17]. Most of those endfire antennas have realized the ultra-wideband and lowprofile features. ...
... It clearly shows very good end-fire radiation performances with low cross-polarizations at all the frequencies obtained. In the E-plane radiation patterns, a 30-degree titling angle is presented, due to the limited ground plane size [6][7][8][9][10][11][12][13][14][15][16][17]. ...
... It shows that, over the whole 2-13 GHz, the measured peak gain is averaged above 6 dBi. This gain performance is more stable than most of the previously reported end-fire antennas [6][7][8][9][10][11][12][13][14][15][16][17]. Table 1 concludes the 6-18 GHz wideband end-fire antennas reported recently. ...
This paper proposes an ultra-broadband (2–13 GHz) and low-profile log-period monopole end-fire antenna for the flush-mounted applications. 24 monopoles with a log-period rule are used to cover the whole operating frequency band, and those monopoles are printed on both sides of a low-loss dielectric layer vertically placed over a slot feeding line with wideband microstrip-to-slotline transition. The low profile is realized by bending the parts of the long monopoles so that the overall antenna size is obtained as 40 mm × 100 mm × 13.6 mm. The proposed antenna is fabricated, and the measured results agree with the simulated results very well. The measured results indicate that the proposed antenna can work at the whole 2–13 GHz band with very good end-fire radiation patterns and stable gain performances.
A compact quad-port MIMO antenna with dual-polarization is proposed. Each of the four antenna elements features a modified rectangular radiator (MRR) backed by a partial ground plane and fed by a T-shaped microstrip line. The four antenna elements are interconnected by an X-shaped strip and isolated by a modified plus-shaped (MPS) structure, resulting in over -18 dB of isolation. With a small footprint of only 36 mm × 27 mm, the antenna exhibits a 10-dB impedance bandwidth with a completely overlapping 3-dB axial-ratio bandwidth (ARBW) of 19.32% (7.90–9.59 GHz). Additionally, it can provide a gain of over 3.5 dBi, an efficiency of over 70%, and an envelope correlation coefficient (ECC) of less than 0.01 in both isotropic and real propagation scenarios.
