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A novel printed monopole antenna is presented for circular polarization (CP) operation with broad axial-ratio (AR) bandwidth. The antenna is composed of a monopole, a ground plane, and two parasitic strips. By utilizing two spiral strips coupled by the monopole, broadband CP radiation is achieved. The measured results show the 10-dB impedance bandwidth is 2.75 GHz (1.75–4.5 GHz) and the antenna also...
This paper presents an optimization problem formulation to design broadband antennas with optimal impedance matching considering that the source impedance is tunable inside a range. Usually an antenna is designed to match a given source impedance, which can be too constraining. The new optimization problem formulation is introduced to answer a less strict query: which impedance is optimal for the...
The equiangular spiral antenna is a frequency independent antenna. Therefore it can also be considered as a broadband antenna. In this paper we carry out a parametric study of this antenna by using the electromagnetic solver HFSS. A guideline is presented on the antenna parameters in order to optimize the bandwidth and radiation characteristics.
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