A Tunable RF Front-End With Narrowband Antennas for Mobile Devices
A Tunable RF Front-End With Narrowband Antennas for Mobile Devices
复制标题
适用于移动设备的带窄带天线的可调谐射频前端
DOI：
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发表时间：
2015
影响因子：
4.3
通讯作者：
G. F. Pedersen
中科院分区：
文献类型：
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作者：
P. Bahramzy;P. Olesen;P. Madsen;J. Bojer;S. Barrio;A. Tatomirescu;Peter Bundgaard;A. Morris;G. F. Pedersen
在传统的全双工无线电通信系统中，发射机（Tx）与接收机（Rx）同时激活。Tx和Rx之间的隔离由双工滤波器确保。然而，越来越多的长期演进（LTE）频段渴望多频段操作。因此，提出了一种新的前端架构，以解决日益增加的LTE频段数量以及多种标准。在这样的架构中，Tx和Rx链在整个前端是分开的。通过使天线和滤波器可调谐来解决频带的增加。双工滤波器组被可调谐滤波器和天线所取代，从而在Tx和Rx之间的空中提供双工功能。一个硬件系统已被设计和制造，以证明这种前端架构的性能。测量演示了该架构如何解决由于Tx信号引起的互调和Rx灵敏度降低。滤波器和天线在多个频带上表现出可调谐性。详细说明了LTE频段I的系统验证。完整Tx和Rx前端链的频率响应以及线性度测量结果表明，系统要求得到满足。
In conventional full-duplex radio communication systems, the transmitter (Tx) is active at the same time as the receiver (Rx). The isolation between the Tx and the Rx is ensured by duplex filters. However, an increasing number of long-term evolution (LTE) bands crave multiband operation. Therefore, a new front-end architecture, addressing the increasing number of LTE bands, as well as multiple standards, is presented. In such an architecture, the Tx and Rx chains are separated throughout the front-end. Addition of bands is solved by making the antennas and filters tunable. Banks of duplex filters are replaced by tunable filters and antennas, providing a duplexer function over the air between the Tx and the Rx. A hardware system has been designed and fabricated to demonstrate the performance of this front-end architecture. Measurements demonstrate how the architecture addresses inter-modulation and Rx desensitization due to the Tx signal. The filters and antennas demonstrate tunability across multiple bands. System validation is detailed for LTE band I. Frequency response, as well as linearity measurements of the complete Tx and Rx front-end chains, show that the system requirements are fulfilled.