Abstract
A novel feeding structure in magneto-electric dipole antenna is proposed and analyzed, which is simpler and better in performance than previous designs, involving differential feeding. Due to this improved feeding structure, the antenna has achieved an impedance bandwidth of 133.3% ( 0.5 GHz – 2.5 GHz, resulting into an ultra-wide band antenna. The maximum broadside gain 7.5dBi with unidirectional radiation pattern has also been reported for the entire the range of operation. Symmetry in E-plane and H-plane radiation patterns has been observed due to the symmetry in structure and excitation of antenna. The antenna has also been able to achieve cross polarization levels.
Highlights
Differential circuits have been able to achieve popularity in radio frequency integrated circuits (RFICs) and microwave monolithic integrated circuits (MMICs) because of their good performance characteristics like common mode rejection, low mutual coupling, less noise, great harmonic suppression and high linearity
Baluns are required for the transition between differential signals and single ended signals, when they are to be integrated with differential signals
The single ended S parameters-S11, S12, S21 and S22; of the proposed antenna were measured with vector network analyzer as a single ended two ports network
Summary
Differential circuits have been able to achieve popularity in radio frequency integrated circuits (RFICs) and microwave monolithic integrated circuits (MMICs) because of their good performance characteristics like common mode rejection, low mutual coupling, less noise, great harmonic suppression and high linearity Most of these antennas have been designed for single-ended circuits. The antenna possesses many advantages like, simple structure, equal Eplane and H-plane radiation pattern, low cross polarization level, wide impedance bandwidth and constant gain within the range of operating frequency. A differentially fed magnetoelectric dipole antenna has been reported by [10,11], to achieve an impedance bandwidth of 114% from 2.95GHz10.73 GHz. In spite of having stable gain and identical Eplane and H-plane radiation patterns in the entire range of operation, this UWB antenna is very complex in structure. Almost Identical radiation pattern for Eplane and H-plane has been observed due to the proposed feeding structure
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