A co-designed (3+3)-port antenna for dual-band operation that requires no feeding or decoupling network is proposed and verified. The antenna consists of six ports which are divided into two groups that resonate in two different frequency ranges. The basic radiating element is a tri-modal patch in a folded snowflake-shaped structure with the largest antenna dimension of $0.48\mathit {\lambda _{1}}$ or $0.68\mathit {\lambda _{2}}$ , where $\mathit {\lambda _{1}}$ and $\mathit {\lambda _{2}}$ are the wavelengths in air at the center frequencies of the lower and upper operating bands, respectively. Measurement results show that the 10 dB impedance bandwidths of the two respective bands are 19.7% and 14.4%. The proposed antenna exhibits compact, multiport, multiband and broadside radiation characteristics which are not only suitable for dual-band MIMO applications, but also for energy harvesting systems with spatial and frequency diversities, or dual-function wireless systems with simultaneous information and power transfer.

中文翻译：

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共同设计的3+3端口双频宽边三模贴片天线

提出并验证了一种无需馈电或去耦网络的用于双频段操作的协同设计的 (3+3) 端口天线。天线由六个端口组成，这些端口分为两组，在两个不同的频率范围内谐振。基本辐射元件是折叠雪花形结构中的三模贴片，天线尺寸最大为 $0.48\mathit {\lambda _{1}}$ 或者 $0.68\mathit {\lambda _{2}}$ ， 在哪里 $\mathit {\lambda _{1}}$ 和 $\mathit {\lambda _{2}}$ 分别是下工作频带和上工作频带中心频率处空气中的波长。测量结果表明，两个频段的10dB阻抗带宽分别为19.7%和14.4%。所提出的天线具有紧凑、多端口、多频带和宽边辐射特性，不仅适用于双频带 MIMO 应用，而且适用于具有空间和频率分集的能量收集系统，或具有同步信息和功率传输的双功能无线系统。