Unbalanced-to-Balanced and Balanced-to-Unbalanced Diplexer With High Selectivity and Common-Mode Suppression
Unbalanced-to-Balanced and Balanced-to-Unbalanced Diplexer With High Selectivity and Common-Mode Suppression
复制标题
DOI：
10.1109/tmtt.2011.2165960
复制
发表时间：
2011-09
影响因子：
4.3
通讯作者：
Q. Xue;Jin Shi;Jian‐Xin Chen
中科院分区：
文献类型：
--
作者：
Q. Xue;Jin Shi;Jian‐Xin Chen
本文提出并详细分析了两种基于双负载谐振器的新型巴伦双工器。除了双工器之外，两个巴伦双工器也是单端（差分）天线与差分（单端）接收器和发射器之间的接口设备。双负载谐振器不仅具有额外的自由度来实现预期的耦合方案，而且还可以紧凑电路尺寸并扩大第一差分和共模谐振频率的频率分离。在对称四端口平衡-平衡带通滤波器的基础上，介绍了三个50 Ω端口巴伦滤波器的设计过程。两个演示巴伦双工器，不平衡的平衡和平衡的不平衡双工器，在1.84和2.45 GHz的Rx和Tx频率的设计，制造和测量。所实现的巴伦双工器具有出色的带内平衡性能，通带内共模抑制比优于38 dB。高选择性和隔离度也得到了一个交叉耦合方案的Rx和Tx巴伦滤波器。
Two novel balun diplexers based on stub-loaded resonators are presented and carefully examined in this paper. Besides being diplexers, the two balun diplexers are also interface devices between a single-ended (differential) antenna and differential (single-ended) receiver and transmitter. The stub-loaded resonator not only has an extra degree of freedom to realize the anticipant coupling scheme, but it also can compact the circuit size and enlarge the frequency separation of the first differential- and common-mode resonant frequencies. The design procedure of the balun filter with three 50- Ω ports is introduced based on a symmetric four-port balanced-to-balanced bandpass filter. Two demonstrated balun diplexers, unbalanced-to-balanced and balanced-to-unbalanced diplexers, with Rx and Tx frequencies at 1.84 and 2.45 GHz are designed, fabricated, and measured. The implemented balun diplexers present an excellent in-band balanced performance with common-mode rejection ratio better than 38 dB over the passbands. High selectivity and isolation are also obtained by giving a cross-coupling scheme for both Rx and Tx balun filters.