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Beamforming of active antenna array with self-oscillating harmonic mixers

具有自振荡谐波混频器的有源天线阵列波束形成

基本信息

批准号：
14550324
负责人：
SANAGI Minoru
金额：
$ 2.18万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550324/
关键词：
microwave active antenna self-oscillating mixer injection locking phased array beamforming

项目摘要

Beam control using active antenna arrays with self-oscillating harmonic mixers has been investigated. The active antenna is composed of a patch antenna receiving RF signal and a parallel feedback type oscillator which operates as the self-oscillating harmonic mixer, and down-converts the received RF into IF signal. The mixer has two ports for local oscillating (LO) signal. One is an output port extracting the LO signal. The other is an input port for an injection signal to synchronize the local oscillation. The mixers can be coupled unilatarally without other nonreciprocal components by connecting the output port to the input port in the next mixer. In the unilaterally coupled array, the phase differents of the LO signals between the adjacent mixers can be varied without phase shifters in injection locking state by changing the local free-running frequencies of the self-oscillating mixers. The receiving pattern can be controlled by combining the IF signals from the individual active antennas, which have phases associated with the LO signals. The IF is different between the RF and double of the LO frequency so that arbitrary phase differences from 0 to 2π radian can be providedto the output IF signals. The experiments using the two- and three-element arrays demonstrated beam control capability. In addition, conversion efficiency from RF to IF was increased by optimizing coupling strength of a directional coupler on a feedback loop in the self-oscillating mixer.

研究了利用自激振荡谐波混频器的有源天线阵进行波束控制的问题。有源天线由接收RF信号的贴片天线和作为自激振荡谐波混频器工作的并联反馈型振荡器组成，并将接收到的RF信号下变频为IF信号。混频器有两个端口用于本地振荡（LO）信号。一个是提取LO信号的输出端口。另一个是注入信号的输入端口，用于同步本地振荡。通过将输出端口连接到下一个混频器中的输入端口，混频器可以在没有其他非互易元件的情况下单向耦合。在单边耦合阵列中，通过改变自激振荡混频器的自激频率，在注入锁定状态下，无需移相器就可以改变相邻混频器之间本振信号的相位差。可以通过组合来自各个有源天线的IF信号来控制接收模式，所述IF信号具有与LO信号相关联的相位。IF在RF和LO频率的两倍之间是不同的，因此可以向输出IF信号提供0到2π弧度的任意相位差。使用两个和三个元件阵列的实验证明了光束控制能力。此外，通过优化自激振荡混频器反馈环上定向耦合器的耦合强度，提高了射频到中频的转换效率。