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Impedance Characteristics of Two Coplanar RLTs in Millimeter Wave VCO Waveguide Cavities
Authors:Dalong Zhu and Jinping Xu
Affiliation:(1) State Key Lab. of Millimeter Waves, Southeast University, Nanjing, Peoples Republic of China
Abstract:Impedance characteristics of two coplanar radial line transformers (RLTs) placed in millimeter wave voltage control oscillators (VCOs) waveguide cavities have been studied in this paper. Mode matching methods are employed to calculate self impedance of the RLT mounted on active device and mutual impedance of the two coplanar RLTs. Some general rules concerning impedance characteristics of two coplanar RLTs configuration influenced by the parameters of the structure have been deduced. In addition, an equivalent network is presented based upon the impedance matrix of the coplanar RLTs; the load impedance looking outward from the active device has been derived in virtue of the equivalent network and the impedance of varactor diode. The equivalent network which describes the relationships between the load impedance and the impedance of varactor diode is helpful for developing millimeter wave varactor-tuned VCO of this structure.
Keywords:  KeywordHeading"  >Keyword Impedance characteristics  Radial line transformers (RLTs)  Voltage control oscillators (VCOs)  Mode matching methods  Equivalent network
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