Compact dielectric resonator antenna with bandwidth enhancement via loading of shorting pins

Abstract

A novel compact cylindrical dielectric resonator antenna (DRA) with improved bandwidth is proposed in this study. By loading the shorting pins around the nodal line of electric fields of TM011 mode of the DRA, an additional shorting‐pin mode could be excited for the antenna, while keeping an almost constant frequency of TM011 mode. After that, the DRA loaded with two, three, and four shorting pins is further studied. The results indicate that the resonant frequency of the shorting‐pin mode is progressively pushed up by increasing its number. With these arrangements, an improved‐bandwidth is obtained for the DRA loaded with four pins. Finally, the proposed DRA is fabricated and measured to validate the predicted performances. The results show that the DRA has gained an enhanced‐bandwidth (|S11| < –10 dB) of about 17% (3.65–4.33 GHz) under the radiation of dual modes, while keeping the stable conical radiation patterns. Most importantly, the height and diameter of the dielectric radiator are maintained as small as 0.09 and 0.32 free‐space wavelength, respectively.

High Gain Compact UWB Antenna for Ground Penetrating Radar Detection and Soil Inspection

“…This can be calculated considering the spatial resolution, and, apart from the spatial resolution, the range resolution (10 mm for 10 cm distance between the antenna and the target) and cross-range resolution (11.28 mm). The full explanation and formulas are presented in [ 30 , 52 , 53 , 54 ].…”

“…Therefore, it slightly increases the BW (utilizing shorting pins is a technique that can produce more poles or resonances, enhancing the antenna gain and radiation efficiency, increasing the BW and surface-wave suppression). Due to the inductive shunt effect of these shorting pins, the dominant mode’s resonant frequency is tuned up to enhance the radiation gain of a single patch antenna [ 28 , 29 , 30 ]. This also improves the level of reflection coefficient at two resonances at the lower band (the pins acting like a parallel resistor and inductor in series with a capacitor).…”

Compact Dielectric Resonator Antenna With Improved Bandwidth via Loading of Metal Ring

“…where c is the velocity of light in the free space. Once the values of h and β are known, f0 can be calculated through (15) and ( 16). According to (1), h and β are used to describe the Ez component of the TM01δ mode, and with reference to (15) and ( 16), the resonant frequency of the TM01δ mode is also determined by h and β.…”

“…Once the values of h and β are known, f0 can be calculated through (15) and ( 16). According to (1), h and β are used to describe the Ez component of the TM01δ mode, and with reference to (15) and ( 16), the resonant frequency of the TM01δ mode is also determined by h and β. It indicates that the perturbation of the E-field can be reflected on the resonant frequency through h and β.…”

A novel probe‐fed directional dielectric resonator antenna for mobile communication

“…A variety of methods for improving the bandwidth of DRA are studied, such as using the high-order modes inside the DRA, [5][6][7] or expanding the bandwidth by adopting the special shapes with different resonant modes and adjustable parameters, 8,9 and further expanding the bandwidth by using parasitic elements [10][11][12] and new feeding structures. 13,14 Compared with single-layer DRA, stacked DRA with different dielectric constants has wider bandwidth from 8.7% to 15%.…”