应用芯片和贴片天线解决分集和多频带射频问题

　　应用芯片和贴片天线解决分集和多频带射频问题

　　手持式和便携式无线产品，如智能手机和可穿戴设备依靠微小的芯片设计师，补丁和跟踪天线，可放置在设备。虽然这些微型设备解决的问题，使多频带天线阵列小尺寸的系统，他们还介绍了相关的问题，降低辐射效率，阻抗匹配，并与附近的物体和机构的相互作用。

　　为了解决这些问题，设计人员正在配备新的设计和电路技术，使这些天线不仅仅是一个独立的组件。相反，他们正在成为一个动态的天线子系统，减轻许多这些设计挑战的一部分。这种转变的设计需要大量的仿真和分析，这是解决不断完善的现场求解软件。

　　Chip， patch antennas offer tradeoffs

　　There are many reasons to move from traditional， external whip or stub antennas to chip and patch antennas， starting with aesthetics and the fragility of external antennas. From a performance point of view， devices such as smartphones often need multiple antennas for a given band to provide antenna diversity for improved performance. In addition， multiband devices – especially those for devices compatible with the emerging 5G standard– will need separate， independent antennas for each band they must support. While the reasons are many， chip and patch antennas have their own tradeoffs.

　　Chip antennas use a multilayer ceramic structure to form a component that is resonant at a target frequency （Figure 1）。 They are small and easily placed on a PC board， just like any other surface-mount component.