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A new broadband circularly polarized quasi magnetic-electric dipole antenna with single feed is proposed. The electric dipole is a pair of metal strip while the magnetic dipole is a pair of vertical shorted metal plate. The currents on the electric and magnetic dipoles exhibits an inherent phase difference of 90°, therefore the wideband circular polarization performance can be achieved. The simulation...
The paper presents a new modeling of three-coupled-lines by considering the cross-coupling between non-adjacent-coupled lines. A simulation based method is proposed to extract the cross-coupling. A synthesis method is then proposed to design the wideband filter composed of three-coupled-lines. As an example, a two-section three-line filter is synthesized, simulated and experimentally realized. The...
In this paper, a millimeter-wave wideband bandpass filter is proposed and designed by using novel slotted substrate integrated waveguide (SIW) units. The unit consists of two pairs of same size dumbbell slots etched on both the top and bottom metal planes of the SIW. The slots act as shunt resonators, which reduce the filter size and produce transmission zeros simultaneously. A five-order bandpass...
A novel methodology is proposed for the design of ultra-wideband filters by the combination of the transmission-line-theory-based frequency-transformation technique to a recently-proposed Chebyshev-filter-based synthesis technique. Firstly, the frequency-transformation technique is mathematically formulated and applied to the basic distributed transmission-line elements — short-circuited shunt stubs,...
A novel microstrip stubs-loaded three-mode resonator is proposed, and a wideband bandpass filter having a midband frequency of 4.1GHz and a fractional bandwidth of 34.2% is designed to meet Japan's UWB low-band spectrum mask. The stubs-loaded three-mode resonator is simultaneously used with half-wavelength resonators and a coupled-line hairpin resonator. As a consequence, the desired wide passband...
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