【作者】 王述宇； 李越；

【Author】 Shuyu Wang;Yue Li;Department of Electronic Engineering,Tsinghua University;

【机构】 清华大学电子工程系；

【摘要】 本文实现了带宽覆盖10-8500 MHz的欧姆区晶体管(Ohmic-Biased Transistor,OBT)有源电小天线。该OBT有源电小天线由电小无源偶极子天线、宽带平衡巴伦以及OBT有源匹配电路构成。为保证天线能够覆盖更宽的频带范围,本文选用了小尺寸沟道的晶体管元件。同时,使用宽带巴伦保证偶极子天线在电小尺寸下具有平衡的辐射方向图。匹配时,偶极子天线两臂分别与巴伦的平衡端口连接,巴伦的非平衡端口通过微带线与晶体管栅极相连,输出端口与漏极连接。相较最低工作频率,该天线尺寸仅有0.001λ×0.0006λ,具有电小尺寸。通过匹配方法,天线在10～8500 MHz频带内反射参数小于-10 dB。该OBT有源电小天线在通信导航一体化等领域具有广阔的应用前景。更多还原

【Abstract】 This paper presents an active electrically small OBT(Ohmic-Biased Transistor) antenna covering 10～8500 MHz band.The proposed OBT antenna is composed of an electrically small passive dipole antenna,wideband balun,and ohmic-Biased Transistor active matching circuit.Through choosing transistor with small gate size,the antenna achieves a wideband coverage.Furthermore,the wideband balun gurantees that the antenna possesses a balanced radiation pattern within electrically small dimensions.During operation,the dipole antenna arms are connected to the balanced ports of the balun,while its unbalanced port is connected to the gate through microstrip line.The drain of the FET is connected to the output port.Comparing to the wavelength of the lowest operating frequency,the antenna size is only 0.001λ×0.0006λ.Through this method,the antenna achieves a bandwidth of 10～8500 MHz with reflection coefficient lower than-10 dB.The active electrically small OBT antenna is with broad potential in communication navigation integration applications.更多还原