Open AccessUnit cell with flexible transmission phase slope for ultra‐wideband transmitarray antennas
Author(s) -
Ramazannia Tuloti S.H.,
Rezaei P.,
Tavakkol Hamedani F.
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5288
Subject(s) - wideband , aperture (computer memory) , antenna aperture , optics , bandwidth (computing) , transmission (telecommunications) , antenna (radio) , phase (matter) , physics , acoustics , electrical engineering , engineering , telecommunications , radiation pattern , quantum mechanics
Having studied the transmitarray antennas, it is found that the cells depending on their location on the antenna aperture should have a specific slope in the transmission phase diagram in terms of frequency. The central cell has the most negative slope, and as long as the centre is farther away, the negative slope of the transmission phase diagram in terms of frequency is reduced. Therefore, the ability to change the slope of the transmission phase diagram in terms of frequency in the unit cell is essential. To validate the proposed approach, by providing a suitable unit cell, a typical X‐band antenna with an aperture size of 20.55 λ 0 2 at 10 GHz has been designed, fabricated, and tested. In order to evaluate the effect of the transmit array aperture, the gain enhancement value of the antenna is calculated and maximum gain of 5.9 dBi at 10.5 GHz and a 29.71% 1 dB gain bandwidth is achieved.