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Miniaturized, Wide Stopband Filter Based on Shielded Capacitively Loaded SIW Resonators

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Chinese Journal of Electronics 2024年第2期33卷 456-462页

作者： Yan ZHENG Hanyu TIAN Yuandan DONG University of Electronic Science and Technology of China (UESTC)

Based on the full-mode capacitively loaded substrate integrated waveguide（SIW） resonator and the miniaturized shielded half-mode capacitively loaded SIW（S-HMCSIW） cavities, a novel compact high-performance filter is proposed. The footprint of the half-mode SIW（HMSIW） is further reduced due to the application of the capacitive-loading technique. By applying cross coupling, the proposed SIW filter's transmission zero enhances the stopband rejection and shows excellent selectivity. For the bandpass filter, the measured |S21| and |S11| are better than 1.09 d B and-14 d B, respectively. And a 3-d B fractional bandwidth（FBW） of 9.14–10.76 GHz（FBW=16.2%）is also observed. The filter achieves a wide stopband with a-20 d B out-of-band rejection up to 2.69f0（f0= 10 GHz）,with a size of 0.39λg× 0.51λgonly. Good agreement between measurement and simulation is obtained.

关键词： Band-pass filters Wireless communication Couplings Resonator filters microwave theory and techniques Filtering theory Passband

microwave Tomographic Imaging of Anatomically Realistic Numerical Phantoms with Debye Dispersion for Breast Cancer Detection Using a Regularized Inverse Scattering Technique in the Time Domain

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Chinese Journal of Electronics 2023年第5期32卷 1133-1150页

作者： LIU Guangdong School of Electrical and Control Engineering Nanjing Polytechnic Institute

In recent years, three similar versions of time-domain inverse scattering(TDIS) algorithms have been proposed for the successful estimation of the dispersive dielectric properties of several single-pole Debye media. For practical applications in common biomedical engineering, an improved TDIS algorithm is explicitly derived to provide a more versatile algorithm for the microwave tomographic imaging of biological tissues. Its three improvements are as follows. The number of poles for Debye models is extended from one to a positive integer W. The second improvement is the extension of unknowns from three to 2W+2 for each discretized cell. The third improvement is the adoption of the first-order Tikhonov regularization scheme. Based on the four classes of 2-dimensional anatomically realistic numerical phantoms with two-pole Debye dispersion from the University of Wisconsin Computational Electromagnetics Laboratory(UWCEM) database, the performance of the developed algorithm for the detection of a 3-mm-diameter tumor implanted in the four types of breast models was investigated for three scenarios. The obtained results preliminarily indicate that the modified technique is feasible and promising for the quantitative reconstruction of sparse breast tissues.

关键词： Inverse problems Phantoms Tomography Media microwave theory and techniques Numerical models Time-domain analysis

On-Chip Reconfigurable microwave Photonic Processor

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Chinese Journal of Electronics 2023年第2期32卷 334-342页

作者： ZHANG Weifeng WANG Bin Radar Research Lab School of Information and Electronics Beijing Institute of Technology Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology) Ministry of Education Beijing Institute of Technology Chongqing Innovation Center Chongqing Key Laboratory of Novel Civilian Radar

microwave photonic processors leverage the modern photonics technique to process the microwave signal in the optical domain, featuring high speed and broad bandwidth. Based on discrete optical and microwave components, different microwave photonic processors are reported. Due to the limitation of the optoelectronic components, most of the realized processors are designed to serve a specific demand. With the booming development of photonic integrated circuits(PICs), new possibilities are opened for the implementation of integrated microwave photonic processors. By using the highprecision planar fabrication process, on-chip microwave photonic processors are enabled to have unprecedently full reconfigurability to perform multiple processing *** overview regarding our recent work on reconfigurable microwave photonic processors is presented with an emphasis on silicon photonics integrated solutions.

关键词： microwave integrated circuits Program processors Optical device fabrication Optical resonators microwave theory and techniques microwave circuits System-on-chip

DESIGN AND PERFORMANCE OF MICROSTRIP-TO-SLOTLINE TRANSITION

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DESIGN AND PERFORMANCE OF MICROSTRIP-TO-SLOTLINE TRANSITION