This letter presents a symmetrically stacked planar antenna (SSPA) featuring switchable quasi-omnidirectional and omnidirectional radiation patterns to accomplish a quasi-isotropic radiation coverage. The proposed antenna consists of two identical planar patch antenna elements. By separately controlling the phase of the two excitation ports, the comprised antenna collectively emulates either an electric dipole mode or a magnetic dipole mode. Collectively, these two complementary dipoles enable a full spherical coverage with a simulated far-field gain variation lower than 6.8 dB. In actual usage scenarios, the proposed antenna can encapsulate various RF circuits and components between the two antennas due to the ground planes functioning as electromagnetic shielding structures. Studies confirm that quasi-isotropic characteristics are preserved for highly integrated user scenarios.

中文翻译：

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展示准各向同性辐射覆盖范围的对称堆叠平面天线概念

这封信介绍了一种对称堆叠平面天线 (SSPA)，具有可切换的准全向和全向辐射模式，以实现准各向同性辐射覆盖。建议的天线由两个相同的平面贴片天线元件组成。通过分别控制两个激励端口的相位，所包括的天线共同模拟电偶极子模式或磁偶极子模式。总的来说，这两个互补偶极子能够实现全球形覆盖，模拟远场增益变化低于 6.8 dB。在实际使用场景中，由于接地平面起到电磁屏蔽结构的作用，因此所提出的天线可以封装两个天线之间的各种射频电路和组件。