Dual‐polarized metasurface‐based monopole antenna design using characteristics mode theory for UHF RFID applications

Abstract

In this research article, a printed dual‐polarized metasurface (MTS) inspired printed monopole antenna using characteristics modes theory (CMT) is investigated for UHF RFID applications. A T‐shaped monopole with U‐shaped asymmetric stubs is designed to generate circular polarization (CP) radiation traits. The grounded MTS layer is constructed with array of unit cells and fixed at air‐gap of λo/4 with reference to the monopole radiator (λo is free‐space wavelength at CP frequency band, 945 MHz), offering good impedance bandwidth (IBW), stable CP boresight radiation gain, and high radiation efficiency. By using CMT, interpretation of CP characteristics is highlighted, that is, the resonating modes exhibit asymptotic nature at the designated CP band with symptotic nature above and beyond the designated operating bands. Dual‐polarized characteristics are observed in both principal planes, due to the effect of grounded MTS loading. The prototype antenna of 0.315λo × 0.315λo is designed and validated. It operates from 836 to 1066 MHz with 24.18% IBW, 5.23% 3‐dB axial ratio bandwidth (ARBW) from 905.1 to 950 MHz and attains >6.8 dBic as a CP peak gain with the total efficiency of >83%. Prior to the attainment of good CP attributes in UHF RFID bands, it can be used for RF energy harvesting and wireless power transmission.

A novel single‐layer dual‐band circularly polarized metasurface antenna for maritime communications

“…Finally, the antenna achieved a 3 dB axial ratio bandwidth of 22.2% and a maximum gain of 9.3 dBic at 6.9 GHz. Other similar works were reported with various shaped MTSs in references, [7][8][9][10][11] All of them showed good circular polarization performance with the help of the MTS.…”

Reconfigurable Antennas for RF Energy Harvesting Application: Current Trends, Challenges, and Solutions from Design Perspective

“…In addition to it, the average CP antenna gain is enhanced by 2.35 times, the 3 dB axial ratio bandwidth is also improved with a rise of 3.08 times, and a fractional bandwidth of >25% is attained. Thus, the changes in this type of characteristic are often attributed to the movement of incoming currents and the generation of stronger orthogonal fields over the desired CP frequency bands [143][144][145][146][147][148].…”

Narrow and wide band monopole antenna design using heterogeneous bidirectional recurrent neural network for LTE and UWB applications

“…This voltage‐dependent capacitance is the basis for differentiating both diodes 24–27 . Numerous methods have been widely scrutinized to attain multiband along with ultrawideband characteristics by using a radiator like loop shape, ellipsoid, circle, semicircle rectangle, triangle, spiral, or square 14 antenna 28–30 …”

“…[24][25][26][27] Numerous methods have been widely scrutinized to attain multiband along with ultrawideband characteristics by using a radiator like loop shape, ellipsoid, circle, semicircle rectangle, triangle, spiral, or square 14 antenna. [28][29][30] Recently, composite right-/left-hand transmission line MTM antenna derived significant consideration. They are widely employed to create smaller resonant antennas.…”