Denis BUKURU - Academia.edu (original) (raw)

Papers by Denis BUKURU

International Journal of Microwave and Wireless Technologies, Jan 13, 2016

bukuru denis, kaijun song and fan zhang A compact dual-band bandpass filter using stub-loaded ste... more bukuru denis, kaijun song and fan zhang A compact dual-band bandpass filter using stub-loaded stepped impedance resonator (SLSIR) with cross-slots is presented. The symmetric SLSIR is analyzed using even-and odd-mode techniques. Design equations are derived and they are used to guide the design of the circuits. Two passbands can be easily tuned by cross-slots and open stubs. Transmission zeros among each passbands are created, resulting in high isolation and frequency selectivity. An experimental circuit is fabricated and evaluated to validate the design concept. The fabricated filter is compact with 19.76 × 12.7 mm 2. The measurement results are in good agreement with the full-wave simulation results.

This work presents a compact dual-band bandpass filter (BPF) based on stub-loaded rectangular loo... more This work presents a compact dual-band bandpass filter (BPF) based on stub-loaded rectangular loop stepped impedance resonator (SLRLSIR). The proposed SLRLSIR consists of two outer open-circuited and two inner open-circuited stubs, which are designed to the central sides of the rectangular loop resonator. Owing to its symmetry, even-and odd-mode analysis methods are applied to deduce the equivalent-circuit equations and to justify the structural design. The second passband can be easily tuned by changing the two inner open-circuited stubs when the first passband is fixed at a desirable frequency. The upper stopband is improved by a pair of additional open-circuited stubs stepped impedance resonators at the I/O ports. Transmission zeros are generated between passbands and stopbands. A SLRLSIR prototype dual-band BPF with central frequencies of 2.42/4 GHz is fabricated and systematically studied. The measurement results agreed well with the simulation results

Journal of University of Burundi, Aug 29, 2021

IJEL, 2019

International Journal of Microwave and Wireless Technologies

A dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a c... more A dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidth (FBW) are easily tuned by changing the physical dimensions of the resonator. Three transmission zeros are generated to improve the performance in the upper stopband. A DCLSIR prototype BPF is fabricated with a center frequency of 9.3 GHz, and evaluated to validate the design concept. The measured FBW is 9.25%, the insertion loss is 1.58 dB, and the return loss is over 17 dB. The measurement results agree well with the simulation results.

IEEE Transactions on Microwave Theory and Techniques

Microwave and Optical Technology Letters, 2014

Mon domaine de recherche Mes intérêts de recherche incluent les dispositifs passifs (antennes, fi... more Mon domaine de recherche Mes intérêts de recherche incluent les dispositifs passifs (antennes, filtres, duplexeurs, multiplexeurs, diviseurs de puissance, coupleurs, etc), circuits et systèmes à micro-ondes/ondes millimétriques.

AEU - International Journal of Electronics and Communications, 2014

ABSTRACT A miniaturized microstrip bandpass filter based on a rectangular dual spiral resonator (... more ABSTRACT A miniaturized microstrip bandpass filter based on a rectangular dual spiral resonator (DSR) is proposed in this paper. The rectangular DSR bandpass filter is centered at 3.65 GHz to suit for Wireless LAN (IEEE802.11y) application. The proposed filter offers transmission zero at the high side of out-of-band response. Across the bandwidth, the measured minimum insertion loss is about 1.7 dB, while the measured return loss is better than 19 dB. Measurement results are good agreement and closed to the simulated ones. The total circuit size of the miniaturized bandpass filter is about 0.145 λg by 0.135 λg, where λg is the guided wavelength at 3.65 GHz.

Progress In Electromagnetics Research C

A compact microstrip diplexer based on dual closed loop stepped impedance resonator (DCLSIR) is p... more A compact microstrip diplexer based on dual closed loop stepped impedance resonator (DCLSIR) is proposed. The proposed microstrip diplexer is composed of the combination of two DCLSIR bandpass filters (BPFs), which are designed for X-band application. For the demonstration, a dual-channel diplexer has been designed and fabricated using microstrip and printed circuit board (PCB) technologies, respectively. The fabricated diplexer, operating at 8.3/10 GHz for X-band application, has compact size (15.17 mm × 2.69 mm). The measured results are in good agreement with the full-wave simulation results. Good isolation between two channels is achieved.