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Based on the substrate integrated circular cavity (SICC), a novel X-band dielectric resonator oscillator is developed. Owing to the high quality factor and planar structure of the SICC, the advantages of our proposed oscillator consist of low phase noise, small size, low cost, and planar integration. In this paper, the series reflection type is selected as the topology of our proposed oscillator and...
In microwave communication, millimeter frequency synthesizer is applied widely. In order to achieve Ku band signal up-converted from S band, the 9.6GHz local frequency source with high stabilizability and precision is realized from the synthesizer based on high performance digital chip PE3236 which produce 2.4GHz signal, with the use of the fourth multiplier to multiple the signal to fourth and the...
A circularly polarized metallic cylindrical cavity antenna with wide beamwidth is proposed in this paper. The idea is to enlarge the antenna size for high-frequency applications such as C-band, X-band, K-band and other higher-band systems but still maintain good performance. A C-band prototype is designed, fabricated and measured. The overall dimensions are 1.35λ0 × 1.35λ0 × 0.83λ0, which is electrically...
The performance of 14-vanes 5.8GHz strapped magnetron is modeled, including cathode, vane, straps, pole pieces and output antenna using three-dimensional electromagnetic simulation code. The electric field distribution in the cold cavity simulation and the formation of the seven electron spokes confirm the π mode work in the oscillation cavity region. The output frequency 5.787GHz and output power...
A single-cavity dual-mode substrate integrated waveguide (SIW) bandpass filter (BPF) for X-band application is presented in this paper. Coplanar waveguide (CPW) is used as SIW-microstrip transition in this design. Two slots of the CPW with unequal lengths are used to excite two degenerate modes, i.e. TE102 and TE201. A slot line is etched on the ground plane of the SIW cavity for perturbation. Its...
An electromagnetic model for coaxial cavity filter is theoretically analyzed in this paper. Based on this model, the calculation expressions of cavity coupling factors are derived, and the eigenmode value of each resonator unit is obtained, which are significant parameters to filter design. The 3D electromagnetic simulation software is used to analysis and optimization for the narrow-band cavity filter...
This paper introduces the recent progress in the metamaterial-based technology applied in high-gain planar antenna design. First, we brief the important considerations and challenges in the design of high-gain antennas such as losses or radiation efficiency and operating bandwidth when the metamaterials structures are used to enhance the performance of antennas. After that, a Febry Perot cavity antenna...
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