A newly designed broadband microstrip equalizer

In this paper, a good matched microstrip broadband equalizer is developed. Branch microstrip resonators are used to construct the equalizer, with thin-film resistors imported into the resonators. The influence of the resistor on the resonant frequency of a microstrip resonator is investigated through numerical simulations and experiments. By loading a thin-film resistor in the branch resonator, an adjustable quality factor is achieved. High frequency structure simulator (HFSS) is used to show that the microstrip branch resonator incorporated with this thin-film resistor loaded not only can be frequency adjustable, but also can be attenuation adjustable and quality factor adjustable. According to the different value of the thin-film resistor, four different resistor loaded branch resonator are used to realize a 12GHz band frequency curve respectively, and the fabricated figure and the frequency curve are also given. The results show that this method which using thin-film resistor loaded branch resonator is quite suitable to microstrip equalizer.