Purpose

This paper aims to present a compact, broadband substrate integrated waveguide (SIW) three-way power divider with improved isolation based on six-port SIW coupler.

Design/methodology/approach

The power coupling among the three output ports occurs due to short openings in the narrow walls of the central SIW channel. Performance improvement in the isolation and return loss among ports is achieved using matching posts placed at the input and output ends of the coupling region. This enhances the coupling between TE₁₀ and TE₃₀ modes. The input matching ports enhance the return loss, whereas the isolation is alleviated by both the input and output matching posts. The bandwidth enhancement is achieved by optimizing the outer SIW channel widths.

Findings

The measured fractional bandwidth of 27.3% with over 15 dB of isolation and return loss is achieved. The coupling length is 1.55 λ_g at the centre frequency. The power divider achieves better than 15 dB isolation between non-adjacent output ports. The measured reflection and isolation coefficients are in close agreement with simulated results over 8.2 to 10.8 GHz.

Practical implications

Isolation between the adjacent and non-adjacent ports is an important parameter as the reflections from these ports will interfere with signals from other ports reducing the fractional bandwidth of the power divider and affecting the overall performance of the transmitters and receivers.

Originality/value

The authors present the enhancement of isolation between the output non-adjacent ports by optimizing the SIW channel width and matching post in the coupling region to reduce the reflected signals from non-adjacent ports entering into other ports. To the author’s knowledge, this is the only SIW three-way power divider paper showing non-adjacent port isolation among six-port couplers based three-way power dividers.

中文翻译：

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具有改进的隔离度的紧凑型宽带三路衬底集成波导功率分配器

目的

本文旨在提出一种基于六端口 SIW 耦合器的改进隔离的紧凑型宽带衬底集成波导 (SIW) 三路功率分配器。

设计/方法/途径

三个输出端口之间的功率耦合是由于中央 SIW 通道的窄壁中的短开口而发生的。使用放置在耦合区域的输入和输出端的匹配柱实现端口间隔离和回波损耗的性能改善。_{这增强了 TE 10}和 TE ₃₀模式之间的耦合。输入匹配端口增强了回波损耗，而输入和输出匹配柱都减轻了隔离。带宽增强是通过优化外部 SIW 通道宽度来实现的。

发现

实现了 27.3% 的测量分数带宽以及超过 15 dB 的隔离和回波损耗。中心频率处的耦合长度为 1.55 λ _{g 。}功率分配器在非相邻输出端口之间实现了优于 15 dB 的隔离。在 8.2 至 10.8 GHz 范围内，测得的反射和隔离系数与模拟结果非常一致。

实际影响

相邻和非相邻端口之间的隔离是一个重要参数，因为来自这些端口的反射会干扰来自其他端口的信号，从而降低功率分配器的部分带宽并影响发射器和接收器的整体性能。

原创性/价值

作者通过优化耦合区域中的 SIW 通道宽度和匹配柱来增强输出非相邻端口之间的隔离，以减少从非相邻端口进入其他端口的反射信号。据作者所知，这是唯一一篇显示基于六端口耦合器的三路功率分配器之间非相邻端口隔离的 SIW 三路功率分配器论文。