應用芯片和貼片天線解決分集和多頻帶射頻問題

　　應用芯片和貼片天線解決分集和多頻帶射頻問題

　　手持式和便攜式無線產品，如智能手機和可穿戴設備依靠微小的芯片設計師，補丁和跟蹤天線，可放置在設備。雖然這些微型設備解決的問題，使多頻帶天線陣列小尺寸的系統，他們還介紹了相關的問題，降低輻射效率，阻抗匹配，并與附近的物體和機構的相互作用。

　　為了解決這些問題，設計人員正在配備新的設計和電路技術，使這些天線不僅僅是一個獨立的組件。相反，他們正在成為一個動態的天線子系統，減輕許多這些設計挑戰的一部分。這種轉變的設計需要大量的仿真和分析，這是解決不斷完善的現場求解軟件。

　　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.