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A class of wideband microstrip-to-microstrip vertical transitions is proposed via multiresonant modes in a slotline resonator formed on their common ground plane. The slot acts as a multimode resonator with microstrip lines at its two sides as the input and output terminals. Multiresonant modes in this slotline resonator can be properly excited by setting a(More)
—A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with triple-notched bands is presented in this paper. The circuit topology and its corresponding electrical parameters of the initial microstrip UWB BPF are desired by a variation of genetic algorithm (VGA). Then, triple-notched bands inside the UWB passband are implemented by coupling a square(More)
A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with dual sharply rejected notched bands based on E-shaped resonator is proposed in this letter. The basic UWB BPF is designed using interdigital coupled lines and rectangular patch multiple-mode resonator (MMR). Then, the resonance properties of the E-shaped resonator are studied. The analyzed(More)
A comprehensive study of a new planar-type balun prototype is presented in this paper for application in the design of balun bandpass filters (BPFs) with widely used open-type resonators. The proposed balun is in general composed of two identical back-to-back quarter-wavelength (λ/4) coupled line sections. The design concept originates from the(More)
An in-line feed-line configuration for design microstrip dual-mode triangular patch resonator bandpass filters (BPFs) is presented in this paper. By properly arranging the feed-line positions, it generates two or four transmission zeros adjacent to cutoff frequencies of the passband, which improves the selectivity. The computed current distributions of a(More)
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