In this paper, dual-mode oval dielectric resonator (DR) is proposed as common resonator to realize all four kinds of balanced and unbalanced duplexers. The conventional topology is replaced with the novel one of sharing input and output dual-mode resonators at the same time for miniaturization. By adjusting the aspect ratio and height of the oval DR, the two modes are separated properly to form two channels of duplexers. After locating probes delicately according to the orthogonality of dual-mode fields, the channel transmission and isolation are ensured simultaneously under sharing output DR. Moreover, both dual-mode unbalanced and balanced operations are studied to extend the topology to all four kinds of duplexers. For verification, balanced-to-unbalanced (B-U) and balanced-to-balanced (B-B) duplexers are both fabricated and tested. Low insertion losses better than 0.59 dB are achieved in both two designs. High isolations lower than -36 dB and -50 dB and common-mode rejections lower than -44 dB and -52 dB are observed in the B-U and B-B duplexers, respectively. The exhibited high performance with reduced resonators demonstrates the potentials of the proposed duplexers in miniaturized FDD communication systems for connecting balanced/unbalanced transceivers with balanced/unbalanced antennas.

中文翻译：

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使用常见椭圆形介质谐振器的平衡和不平衡双工器


本文提出双模椭圆形介质谐振器（DR）作为通用谐振器来实现所有四种平衡和不平衡双工器。传统的拓扑被同时共享输入和输出双模谐振器的新颖拓扑所取代，以实现小型化。通过调整椭圆形DR的长宽比和高度，将两种模式适当分离，形成双工器的两个通道。根据双模场的正交性巧妙定位探针后，在共享输出DR的情况下同时保证通道传输和隔离。此外，还研究了双模不平衡和平衡操作，以将拓扑扩展到所有四种双工器。为了进行验证，平衡到不平衡 (BU) 和平衡到平衡 (BB) 双工器均被制造和测试。两种设计均实现了优于 0.59 dB 的低插入损耗。在 BU 和 BB 双工器中分别观察到低于 -36 dB 和 -50 dB 的高隔离度以及低于 -44 dB 和 -52 dB 的共模抑制。所展示的高性能和减少的谐振器证明了所提出的双工器在小型化 FDD 通信系统中用于连接平衡/不平衡收发器与平衡/不平衡天线的潜力。