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This paper proposes an efficient design method of filtering antennas, enabling to apply a well-established filter design theory to the antenna design. In the design of filtering antenna, an external Q factor at input port, coupling coefficients, and a radiation Q factor of antenna need to be evaluated. However, conventional design methods have a time-consuming procedure, since a time domain response...
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...
This paper introduces a new physical interpretation of a frequency-dependent source/load (S/L) coupling to multi-mode filter designs, thereby successfully generating (N + 1) transmission zeros (TZs) greater than the number of resonant modes N. It is made clear by a transmission-line based analysis with the help of a parameter-extraction technique that the frequency-dependent S/L coupling essentially...
An ultra-wideband bandpass filter (UWB) consisting of stepped-impedance resonators cascaded by parallel-coupled two-line and three-line structures is designed to satisfy Federal Communications Commission (FCC)'s spectrum mask. Firstly, a simpler equivalent circuit for the parallel-coupled three lines is derived based on the transmission line theory. Then, after the derivation of the Chebyshev-type...
This paper proposes a method to measure permittivity anisotropy in the plane of dielectric laminate substrates by utilizing orthogonality of TE111 mode in a circular cavity resonator. For cyclo-olefin polymer (COP), liquid crystal polymer (LCP) and glass cloth PTFE substrates, the permittivity anisotropy in the plane is measured by this method. As a result, usefulness of this method is verified by...
A circular cavity resonance method is improved to measure the frequency dependence of complex permittivity of a dielectric plate by using multimode TE0m1 with integer m of the higher order. The measurement principle is based on a rigorous analysis by the Ritz-Galerkin method. A new circular cavity with lowered height is designed to decrease the number of unwanted modes near the TE0m1 modes from a...
To measure the frequency dependence of complex permittivity of a dielectric rod inserted in the center of a cylindrical cavity, a new method using the multi-mode TM0m0 of the cavity is developed on the basis of the rigorous analysis, where the effect of sample insertion holes is taken into account. Three cavities using the TM010 and TM020 modes and two cavities using the TM010, TM020, TM030 and TM...
A novel compact ultra-wideband (UWB) bandpass filter is developed by using microstrip stub-loaded dual-mode resonator doublets. The proposed doublet consists of two parallel but oppositely arranged stub-loaded resonators, and has a significantly widened passband. A UWB filter is designed by cascading three doublets, and eight transmission poles are obtained in its passband. The filter has a passband...
This paper, at first, discuss the availability of a cavity resonance method using the resonance frequencies of some TM0m0 modes in a circular cavity to measure the frequency dependence of a dielectric rod sample. The influence of sample insertion holes to the measurement are estimated accurately on the basis of the rigorous analysis by the Ritz-Galerkin method. Some dielectric rod samples were measured...
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