Abstract
A thermally tunable slot-coupled dielectric resonator antenna (DRA) has been designed and prepared by placing a thermosensitive ceramic resonator onto the slot. Typical magnetic resonance occurs in the resonator, which is closely related to its dielectric constant. Because the dielectric constant of the ceramic resonator decreases as the temperature increases, the resonance frequency of the proposed DRA increases as the temperature increases. The simulated results are in good agreement with the measured ones, which confirms the thermally tunable behavior. This approach provides a way for designing the frequency tunable antennas.
Highlights
High-performance antennas play a very important role in modern wireless communication systems.[1,2] In the past years, the most classical antennas are microstrip antenna and dielectric resonator antenna (DRA).[3,4,5,6] Microstrip antenna presents a low efficiency at high operating frequency because of metallic loss.[7]
Numerical prediction of the reflection coefficient for the proposed thermally tunable slot-coupled DRA is simulated by using CST Microwave Studio 2011 software that based on the finite integration technique
In order to understand the underlying physics of the proposed DRA, the simulated electric and magnetic field distributions for the thermally tunable slot-coupled DRA at the resonance frequency of 10.06 GHz are shown in Fig. 2(b) and 2(c)
Summary
High-performance antennas play a very important role in modern wireless communication systems.[1,2] In the past years, the most classical antennas are microstrip antenna and dielectric resonator antenna (DRA).[3,4,5,6] Microstrip antenna presents a low efficiency at high operating frequency because of metallic loss.[7] Compared with microstrip antenna, DRA has stimulated tremendous fundamental and practical interests. A thermally tunable slot-coupled DRA by using a thermosensitive ceramic resonator. The slot coupling source is used in the proposed DRA and a cubic thermosensitive ceramic resonator is placed onto the slot. The resonance frequency of such DRA can be dynamically controlled by tuning the temperature
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