Abstract
In this paper, an ultra-wideband dielectric resonator antenna (DRA) is investigated. It basically covers the bandwidth from 6 GHz to 16 GHz and achieves a relative bandwidth of 90.9%. It is found that a wide bandwidth can be reached with a small DRA by adopting multilayer form. Thus, the dimension of the designed DRA element which is composed of nine-element phased-scanning linear array is as small as 6.9mm x 8.2mm x 11 mm. While the maximum stable zenith gain is 6.2dB, the lobe width is 3 dB. The operating frequency range of the antenna array is from 5.42GHz to 16.5GHz, achieving a 101.1% relative bandwidth. A large scanning angle of ±60° is realized within the operating frequency band, with good scanning pattern and cross polarization. To verify the design and simulation, a 1 × 9 DRA array is fabricated, and measurements are carried out.
Highlights
Ultra-wideband technology, as one of the key technologies for integrated radio frequency, plays an important role in the integrated radio frequency system
The rapid development of microwave materials and electromagnetic simulation technology has laid a good foundation for the research and development of the dielectric resonator antenna (DRA)
The main radiation structure of the DRA is composed of the microwave material with very low loss, and the antenna is radiating through the surface of the entire resonator except the ground
Summary
Ultra-wideband technology, as one of the key technologies for integrated radio frequency, plays an important role in the integrated radio frequency system. The basic way to extend the DRA bandwidth is to reduce the Q-factor of the antenna by lessening the permittivity of the dielectric material. This method is mainly suitable for a single mode of operation. 65% fractional bandwidth) realized with a hollow dielectric cylinder equipped with a top-mount spherical cap-lens and a suitably shaped metal reflector is presented in [1] This antenna allows achieving a high-gain (exceeding 14 dBi), excellent linear/circular polarization purity, and a high frontto-back ratio (better than 20 dB), while a cylindrical DRA which employs some layers of uniaxial anisotropic materials to increase the directivity of the antenna in the boresight direction is proposed in [2]. This DRA can be used for the terminal equipment of satellite communication system (8/7GHz X-band and 14/11GHz Kuband) as well as the weather radar system
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