A compact quarter-mode substrate integrated waveguide (QMSIW)-based self-quadruplexing antenna is proposed for compact radio frequency (RF) front ends. The QMSIW-based self-quadruplexing antenna has four unequal resonators resonating at the Industrial, Scientific, and Medical (ISM) band (2.45 GHz), fifth-generation (5G) band (3.5 GHz), wireless local area network (WLAN) band (4.9 GHz), and wireless fidelity band (5.4 GHz). All four resonators radiate through the open-ended wall of the QMSIW resonator and the arc-shaped slot inside the cavity. By properly optimizing the locations and dimensions of the resonators, higher isolation ( $>$ 29.9 dB) is gained. In fact, all four resonators operate on a common grounded substrate with negligible interference. A dummy rectangular device is used to keep the printed circuit board (PCB) and antenna in it to measure the S -parameters and radiation properties. The proposed antenna has a lower circuit size (0.23 $\lambda _{g}^{2}$ ), reasonable gain ( $>$ 3.85 dBi), high efficiency ( $>$ 82.7 %), and high isolation ( $>$ 29.9 dB). Based on the above-mentioned attributes, it is a good candidate for compact RF front ends.

中文翻译：

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适用于紧凑型RF前端的SIW腔背自四倍体天线

针对紧凑型射频（RF）前端，提出了一种基于紧凑型四分之一模式基板集成波导（QMSIW）的自四工天线。基于QMSIW的自四工天线在工业，科学和医学（ISM）频段（2.45 GHz），第五代（5G）频段（3.5 GHz），无线局域网（WLAN）频段具有四个不相等的谐振器（4.9 GHz）和无线保真频段（5.4 GHz）。所有四个谐振器均通过QMSIW谐振器的开口壁和腔体内的弧形槽辐射。通过适当优化谐振器的位置和尺寸，可以实现更高的隔离度（ $> $ 29.9 dB）。实际上，所有四个谐振器均在公共接地基板上工作，干扰可忽略不计。虚拟矩形设备用于将印刷电路板（PCB）和天线保持在其中，以测量小号 -参数和辐射特性。建议的天线电路尺寸较小（0.23 $ \ lambda _ {g} ^ {2} $ ），合理的收益（ $> $ 3.85 dBi），高效率（ $> $ 82.7％）和高隔离度（ $> $ 29.9 dB）。基于上述属性，它是紧凑型RF前端的理想选择。