| There are two ways to obtain millimeter band signal source . One is obtained directly by some kinds of oscillators ,the other is obtained by doubling microwave band frequency signal .This paper presents theoretical analysis, circuit design of ka band doubler using two beam-lead Schottky barrier diodes as variator.First, we ealborately-study all kinds of balance structures of circuits , then research characters and applications of non-liner components. All of them comprise the base of our theory and bring out a a conference way to other kinds of multipliers.Second, CAD technology (HP EEsot" Series IV, HP Advanced Design System and High Frequency Structure Simulator) is applied to design the doubler, which includes an anti-parallel diode pair and the microstrip circuit. A Ka-wide-band frequency doubler employing beam-lead Schottky diodes is developed in the paper. And the input circuit and output circuit of a frequency doubler are realized by using low loss suspend stripline(suspended LPF> SCPW) and fin line. Input and output signals are isolated and harmonic component of the output signal is very low by using a unique planar balanced circuit structure.Third, we make a Ka band doubler according to the simulating results and measure it. The frequency doubler receives input of 13dBm and exhibits output greater than OdBm. Conversion loss is less than 13dB.It reaches what we have expected. The doubler can be used in expanding frequency of measure system and local oscillators of receiver or simulator signal source of transmitter. |
