dc.description.abstract | This thesis proposes a triple-mode resonator using lumped elements. The circuit consists of a half-wavelength resonator with parallel capacitor and inductor. By adjusting the parameters of the resonator, the three resonance frequency of the resonator can be changed. Therefore, a variety of circuits with different bandwidth requirements can be designed. In this thesis, three different circuit architectures are designed using this resonator.
Based on the proposed resonator, the first circuit is bandpass filters with different bandwidths (14.2%, 55.5%, 98.7%) centered at 2.45 GHz. To meet the required bandwidths, one can adjust the capacitance and inductance of the lumped elements. The gap of the coupling structure is tuned for coupling between resonator and I/O. The design flow of this bandpass filter was noted in detail in the article.
The second circuit is a high-order ultra-wideband bandpass filter using the proposed triple-mode resonator. In traditional wideband filter, there is often a problem that the gap of the coupled part is too small. This situation will cause etching difficulty. To solve this problem, several coupling architectures were simulated and analyzed. Finally, an ultra-wideband (141%) bandpass filter with a moderate coupling gap and good circuit characteristics is designed.
The third circuit uses a triple-mode resonator to design a filtering power divider. A design method is proposed. The circuit can be divided into filtering part and isolation part. Through the change of the output terminal impedance of the filtering part and the input terminal impedance of the isolation part, the achievable bandwidth of the circuit is adjusted. With the design of the triple-mode resonator, the circuit features flexible bandwidth and great design freedom. Finally, a wide band (100.8%) and narrow band (10.3%) filtering power divider were implemented to verify the design concept. | en_US |