Deng Fang

Bio: Deng Fang is an academic researcher from University of Electronic Science and Technology of China. The author has contributed to research in topics: Band-stop filter & Constant k filter. The author has an hindex of 1, co-authored 2 publications receiving 1 citations.

A E-band E-plane type waveguide bandpass filter

Abstract: This paper present the design of E-band E-plane bandpass waveguide filter with the E-plane inserted metal strip. And the waveguide filter is analyzed and optimized by filter structure character. In simulation, the E band waveguide electromagnetic simulation software according to the waveguide filter is operated from 72.2GHz to 73.8GHz with the maximum insertion loss of 0.41dB. And the relative bandwidth of the waveguide filter is about 2%. At last, contrast about the experiment results and the simulation data is analyzed.

A Ku-band high power backward wave oscillator

Abstract: The paper reports on the design and performance of a high power backward wave oscillator (BWO), working at Ku-band frequencies. The rectangular waveguide grating structure is used as its slow wave structure. The backward wave oscillator is driven by a sheet beam with cross sectional area of 30mm×1mm which is generated by a thin cathode. For a beam voltage 185kV, and beam current 3.2kA, the output power is 2.5MW at 14.3GHz.

Effects of Defected Waveguide Structure Toward Wideband Monopole Antennas

Abstract: This paper presented the effects of Defected Waveguide Structure (DWS) toward wideband monopole antennas. Ultra-wideband (UWB) technology was introduced to support high data rate and maximum bandwidth utilization. Monopole antenna received great attention owing to its appealing features of planar in the structure and is easy to manufacture in miniaturized sizes. Yet, poor gain and directivity are always the drawbacks of the miniaturized antennas. It was found that there was no research work done on the monopole antenna design with DWS. Two wideband monopole antennas with a microstrip feed line and coplanar waveguide (CPW) feed line were proposed. Two waveguides with full copper and square DWS were designed at all the inner walls. Monopole antennas were then integrated in the waveguides. The antenna parameters studied were return loss, efficiency, gain, directivity and radiation pattern to investigate the effects of DWS toward monopole antennas. Both monopole antennas achieved wide bandwidth from 2.5 GHz to 11 GHz and higher efficiency of more than −2 dB. Monopole antennas with waveguide presented a narrower bandwidth from 6 GHz to 11 GHz but a significant directivity improvement of 5 dBi at a lower frequency of 4.5 GHz. Monopole antenna with square DWS demonstrated high directivity and gain in a wide bandwidth of 8.5 GHz. Higher gain was improved around 4 dB at the frequency of 4.5 GHz, and high efficiency of more than −2 dB was achieved. The DWS design served as a guide for future communication system based on the smart technology system.

Design of Chebyshev Bandpass Waveguide Filter for E-Band Based on CSRR Metamaterial

Abstract: AbstractA waveguide bandpass filter (WBPF) based on the Chebyshev response that operates in the E-band system for downlink channel [71 GHz–76 GHz] at 73.5 GHz resonant frequency has been designed and simulated. The new design of the WBPF used complementary split-ring resonators (CSRRs) that both rings are located transversely on the metallic sheet. Lumped circuit of the filter has been implemented and discussed as well. The circuit of the prospective bandpass filter has been designed and demonstrated via electromagnetic full-wave simulator CST. By selecting proper physical dimensions of CSRRs, a shortened physical length, a flat and lossless passband, and better return loss rather than the traditional waveguide filter. Subsequently, the proposed waveguide BPF and the traditional WBPF which coupled with inductive H-plane resonators have been compared at the same resonant frequency 73.5 GHz. The new waveguide bandpass filter shortened the physical length of WBPF by \(37.5\%\) and boosted the return loss up to \(6.7\%\).KeywordsMicrowave filterMetamaterialsWaveguideResonatorsE-band