Millimeter Wave Gain Equalizer

The millimeter-wave power module (MMPM) is a super power module integrated with solid state drive amplifier (SSA), traveling wave tube amplifier (TWT) and DC power, it has a very broad application in the electronic warfare systems. It takes full advantage of the solid-state devices and electric vacuum devices, has the characteristics of low-noise, high-gain, high-power and high-efficiency. It meets the requirements of new weaponry well.The gain equalizer is used to solve the problem that the gain of the traveling wave tube amplifier is not flat. Good equalization effects are the premise of the SSA to provide a suitable driving power, also the guarantees to get good performance of the MMPM. Equalization accuracy, power capacity and the port reflection are important performance parameters of equalizer, to meet these requirements at the same time makes the design difficult.This thesis focuses on the development of the gain equalizer. To improve the equalization accuracy, we construct a notch unit with stepped impedance resonance (SIR). Using the equivalent circuit and microwave network theory, we get the control methods of the bandwidth, the main frequency, the parasitic frequency and the attenuation of this notch structure. We completed experiments of three attenuation compensation methods, including narrowband attenuation compensation with a parallel coupling unit, middle-band with a branch resonant unit and the broadband with a film resistors upside down installation. To improve the power capacity, we arrange the resistor size according to the energy distribution reducing the density of the surface current. And to get a good port reflectometer performance, we simplify equalizer model and derive the matching condition. We analyze the impact of the bridge structure on the equalization curve, and complete a balanced equalizer. In addition, We explore new equalizer forms based on LTCC technology, by embedding SIW resonant unit into the LTCC layers. Finally, we develop a millimeter-wave solid-state drive module successfully, the tested results meet the requirements well, verify the usefulness of the equalizer.