A compact pattern diversity patch antenna working at 5.8 GHz is proposed. The patch antenna has two ports, which are responsible for the broadside radiation and omni-directional radiation, respectively. The broadside radiation is achieved by inserting a substrate slot-loaded integrated waveguide (SIW) cavity at the center of the patch antenna, and the omni-directional pattern is realized by exciting the shorted patch in-phase from both sides of the SIW cavity. Although the two operating modes share the same radiator, but a high isolation of over 30 dB is achieved, due to the cancellation of current at the inputs. In addition, two approaches are investigated to enhance the operation bandwidths. The pattern diversity antenna is prototyped and measured, showing an impedance bandwidth of 5.69–5.92 GHz for both modes/channels, and a high inter-channel isolation over 30 dB, making it suitable for indoor wireless communication systems.

中文翻译：

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用于无线应用的紧凑型带内模式分集天线

提出了一种工作在 5.8 GHz 的紧凑模式分集贴片天线。贴片天线有两个端口，分别负责宽边辐射和全向辐射。宽边辐射是通过在贴片天线的中心插入衬底槽加载集成波导 (SIW) 腔来实现的，全向模式是通过从 SIW 腔的两侧同相激励短路贴片来实现的。虽然这两种工作模式共享同一个辐射器，但由于输入端的电流被抵消，实现了超过 30 dB 的高隔离度。此外，研究了两种方法来提高操作带宽。对模式分集天线进行原型设计和测量，显示两种模式/信道的阻抗带宽为 5.69–5.92 GHz，