應(yīng)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(chǎn)品，如智能手機(jī)和可穿戴設(shè)備依靠微小的芯片設(shè)計(jì)師，補(bǔ)丁和跟蹤天線，可放置在設(shè)備。雖然這些微型設(shè)備解決的問題，使多頻帶天線陣列小尺寸的系統(tǒng)，他們還介紹了相關(guān)的問題，降低輻射效率，阻抗匹配，并與附近的物體和機(jī)構(gòu)的相互作用。

　　為了解決這些問題，設(shè)計(jì)人員正在配備新的設(shè)計(jì)和電路技術(shù)，使這些天線不僅僅是一個(gè)獨(dú)立的組件。相反，他們正在成為一個(gè)動(dòng)態(tài)的天線子系統(tǒng)，減輕許多這些設(shè)計(jì)挑戰(zhàn)的一部分。這種轉(zhuǎn)變的設(shè)計(jì)需要大量的仿真和分析，這是解決不斷完善的現(xiàn)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.