科研之友
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摘要
In this letter, an electrically small quasi-isotropic antenna using folded split-ring resonators is investigated. The antenna is based on split-ring resonators (SRRs) to achieve a quasi-isotropic radiation pattern using the electric and magnetic dipole current of the SRR. Interdigital capacitors are used to make the size more compact, and magnetic coupling of a folded structure is applied to improve the radiation characteristics of the SRR antenna. The electrical size of the antenna has ka = 0.41 at 888 MHz and 1.8% of fractional bandwidth. The measured gain deviation (Delta) is 5.2 dB and the measured radiation efficiency is higher than 81% in the bandwidth.
- 出版日期2017
