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A novel microstrip tri-band bandpass filter with controllable center frequencies by applying stub-loaded triple-mode resonator is presented. The resonator is constructed by loading a stepped-impedance stub (SIS) and an open stub on a traditional stepped-impedance resonator (SIR). The novel resonator can be utilized to design tri-band BPF. In addition, four transmission zeros generated by the resonator...
A pattern reconfigurable U-slot antenna on a microwave substrate is presented. The antenna consists of a U-slot patch and eight shorting posts. Each edge of the square patch is connected to two shorting posts by PIN diodes. By switching between the different states of the PIN diodes, the proposed antenna can radiate boresight or conical patterns; moreover, the position of the main lobes of the conical...
A novel theory of complex phase angle is presented to deal with the resonance problems of an arbitrarily complicated transmission line cavity effectively, which merges various losses of transmission lines (including source and load losses) in the imaginary part of the complex phase angle. This letter shows that the real part of the complex phase angle determines the resonant frequency...
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