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A large scale low-profile traveling-wave narrow-wall slotted waveguide array with 2160 slots is analyzed by parallel method of moments (MoM) out-of-core solver based on the higher order basis functions (HOBs). Its accuracy is validated through comparison with the finite element method (FEM) adopted in the commercial software Ansoft HFSS. An out-of-core two-dimensional block-cyclic distribution scheme for the large dense full matrix filling and an out-of-core LU (lower/upper) decomposition matrix equation solver are utilized under the message passing interface (MPI). Numerical results are shown to demonstrate the memory cost effectiveness, time efficiency of the proposed method and its applicability. The method presented in this paper is able to solve challenging realistic problems in large scale. [ABSTRACT FROM AUTHOR]

A novel bandpass filter with two dual-mode cavities based on the substrate integrated waveguide (SIW) is presented. By making use of the inductive discontinuities in an SIW cavity, two degenerate modes can be excited. Due to the phase difference of the two modes in each cavity, two transmission zeros on each side of the passband are created, so the out-of-band rejection of the filter is significantly improved. An SIW dual-mode filter with a center frequency of 12 GHz has been fabricated and measured. The experimental results agree well with the simulation results. [ABSTRACT FROM AUTHOR]

Electromagnetic band-gap (EBG) structures exhibit unique electromagnetic properties that have led to a wide range of applications to the antenna and propagation fields. This paper investigates the performance of a waveguide end-slot phased array (WESPA) antenna integrated with mushroom-like EBG structures. The mushroom-like EBG structure has the advantage of compactness and offers the capability to block the surface wave coupling of the phased array, which provides a possible solution to the "blind spots" problem of the WESPA. Some novel and efficient EBG array configurations are proposed, and an infinite phased array and a finite phased array of 3 × 9 slot elements are analyzed. The tradeoffs and design considerations of EBG structures are discussed to obtain optimum performance. [ABSTRACT FROM AUTHOR]

A method of improving the gain of circular waveguide array antenna using one-dimensional (1-D) electromagnetic band-gap (EBG) structure is proposed in this paper. The detailed analysis is made to study the radiation characteristics of circular waveguide antenna and its array with 1-D EBG structure. The simulation and experimental results show an about 7 dB addition in the antenna gain in compared with the conventional antenna, which proves that the radiation characteristics of antenna array using EBG structure are improved. [ABSTRACT FROM AUTHOR]

A method of raising the front to back (F/B) ratio on the pattern for the slot array antenna of rectangular waveguide by using electromagnetic band-gap (EBG) structure as a high-impedance ground plane is studied in this paper. The benefits of using such an EBG structure are related to the suppression of surface waves excited by the slots of waveguide. In agreement with the expected results, the simulation and experimental radiation patterns show that the EBG structure can increase the front radiation, decrease the back radiation and improve the gain of slot array antenna. [ABSTRACT FROM AUTHOR]