引言随着卫星通信,电子对抗以及导航技术的发展,1969年以来,混频器的研究工作主要是讨论展宽混频器的射频带宽和降低噪声系数。单端混频器、平衡混频器以及平衡器对都是窄带混频器。因为它们的混合电路中高低频旁路短截线等的特性都与频率有关,是些窄带元件,不易于宽频带。虽然也有一些宽频带混合电路,或因其隔离差,或因其损耗大,或因其它元件的影响等,用它们设计的混频器常不能 INTRODUCTION With the development of satellite communications, electronic warfare and navigation technologies, since 1969, mixer research has focused on the broadening of the mixer’s RF bandwidth and reduction of noise figure. Single-ended mixers, balanced mixers, and balancer pairs are all narrow-band mixers. Because of their hybrid circuits in high and low frequency bypass stub and other features are related to the frequency and are some narrow-band components, not easy to broadband. Although there are some broadband hybrid circuits, either because of their poor isolation, or because of their large losses, or the effects of other components, the mixers they are designed to often can not