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Showing papers by "He Zhu published in 2013"


Journal ArticleDOI
TL;DR: In this article, a band-notched ultra wideband (UWB) slot antenna with bandnotched characteristics is proposed, where a stepped slot is adopted as a radiator to realize UWB impedance matching and reduce the antenna size.
Abstract: A compact ultra-wideband (UWB) slot antenna with band-notched characteristics is proposed. A stepped slot is adopted as a radiator to realize UWB impedance matching and reduce the antenna size. By slitting an open-ended quarter-wavelength split slot on the back of the feed and a short-ended half-wavelength split-ring slot near the stepped slot, a second-order notched band of 5.15-5.85 GHz is achieved. Compared with the traditional band-notched antenna, the selectivity of the notched band is greatly improved and size of the antenna is reduced at the same time. The volume of the antenna is only 22 mm×8.5 mm×0.8 mm. Besides, the bandwidth can be easily controlled by adjusting the lengths of the two slots respectively. Good agreement is achieved between simulated and measured results, which show that the proposed antenna has nice impedance matching and radiation pattern characteristics.

91 citations


Journal ArticleDOI
TL;DR: In this article, a compact ultra-wideband (UWB) bandpass filter using dual-stub-loaded resonators (DSLR) is presented, which is analyzed by using the odd-and even-mode method.
Abstract: A compact ultra-wideband (UWB) bandpass filter using dual-stub-loaded resonators (DSLR) is presented. The DSLR is analyzed by using the odd- and even- mode method. Four resonant modes can be tuned by the DSLR in 3.1 GHz - 10.6 GHz, and a pair of transmission zeros can be generated at the lower and upper stopband when the DSLR is applied to a UWB filter. Therefore a UWB bandpass filter is realized with good skirt selectivity, harmonic suppression, as well as compact size. Finally the proposed filter is simulated and fabricated. The measured results are in good agreement with the predicted one, demonstrating this structure is feasible in practical use.

79 citations


Journal ArticleDOI
TL;DR: In this paper, a quadruplemode ultra wideband (UWB) bandpass filter with a notch-band and wide upper stopband is presented, which is realized using a ring resonator which is loaded with two sets of stubs, i.e., one is loaded in the center and two little stubs at the symmetrical side locations.
Abstract: A quadruple-mode ultra-wideband (UWB) bandpass filter with a notch-band and wide upper stopband is presented in this letter. The UWB filter is realized using a ring resonator which is loaded with two sets of stubs, i.e., one is loaded in the center and two little stubs at the symmetrical side locations. The loaded stubs are used to create transmission zeros in upper stopband thus high modes are suppressed greatly. Moreover, two identical via-loaded ring resonators are inserted within the stub-loaded ring resonator, to create a notch-band around 5-6 GHz to avoid WLAN signals. Two reflection poles appear in the notch-band, resulting in a switchable bandwidth of the notch-band. Finally, a UWB filter with a notch-band is simulated and fabricated, and measured results provide an experimental validation of predicted performance of the filter.

61 citations


Proceedings ArticleDOI
14 Apr 2013
TL;DR: In this article, an ultra wideband (UWB) bandpass filter is proposed, which composes of two pairs of microstrip short-circuited stubs which provide a microstrip-to-CPW transition, and a CPW resonator whose length is about half-guided-wavelength (λg/2) at 6.85GHz.
Abstract: An ultra-wideband (UWB) bandpass filter is proposed in this paper. The proposed structure composes of two pairs of microstrip short-circuited stubs which provide a microstrip-to-CPW transition, and a CPW resonator whose length is about half-guided-wavelength (λg/2) at 6.85GHz. A triple-mode UWB bandpass filter is produced using this microstrip-to-CPW transition structure. In order to suppress WLAN signals around 5.2/5.8GHz, a novel via-stub-loaded structure is designed. By adding this via-stub-loaded structure, a bandstop characteristic is formed as a notch-band whose position and bandwidth could be tuned easily. Simulation results indicate that the reflection loss is lower than -15dB in desired passband, and it also achieves a good performance of the notch-band around 5.2/5.8GHz. Finally, the proposed UWB bandpass filter is fabricated and measured. The measured results are in good agreement with simulated ones.

5 citations


Proceedings ArticleDOI
14 Apr 2013
TL;DR: In this article, an ultra wideband (UWB) bandpass filter with a notch-band and wide upper stopband is presented, which is realized using a ring resonator which is loaded with two sets of stubs, i.e. one is loaded in the center and two little stubs at symmetrical side locations.
Abstract: An ultra-wideband (UWB) bandpass filter with a notch-band and wide upper stopband is presented in this paper. The UWB filter is realized using a ring resonator which is loaded with two sets of stubs, i.e. one is loaded in the center and two little stubs at the symmetrical side locations. The loaded stubs are used to create transmission zeros in upper stopband thus high modes are suppressed greatly. Moreover, two identical meandered resonators are inserted within the stub-loaded ring resonator, creating a notch-band around 5.8 GHz. Finally, two UWB filters with and without notch-band are simulated, fabricated, and measured results provide an experimental validation of predicted performance of the filter.

2 citations


Proceedings ArticleDOI
02 Jun 2013
TL;DR: In this article, a novel fish-bone resonator is presented by cascading multiple cross-shaped resonators, which can conveniently control the resonances of the resonator, which results in a compact size.
Abstract: In this paper, a novel fish-bone resonator is presented by cascading multiple cross-shaped resonators. Characterized by transmission line model analysis, it is found that the resonances of the proposed fish-bone resonator can be conveniently controlled, which results in a compact size. On the other hand, in order to constructed wideband bandpass filter, a novel coupling structure is studied in connection with the special configuration of the fish-bone resonator. Besides, transmission zeros are generated by the proposed fish-bone resonator, thus an ultra-wide stopband is achieved. To illustrate the concept, a wideband bandpass filter with high performance is constructed and measured by two-stage fish-bone resonators. The measured results are in good agreement with the full-wave simulation results. Both simulated and measured results are in good agreement to verify the predicted results.