Miniature Harmonic-Suppressed Microstrip Bandpass Filter Using a Triple-Mode Stub-Loaded Resonator and Spur Lines

Torabi, Amir; Forooraghi, Keyvan

doi:10.1109/lmwc.2011.2122304

Cited by 40 publications

(23 citation statements)

References 9 publications

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“…(1) With the introduction of more CLL elements or some other metamaterial-inspired electrically small resonators that provide the means to control the mutual coupling characteristics, the filtenna impedance bandwidth could be expanded even further. (2) If other compact filters, e.g., from [29], [30], with sharper skirts and wider stopbands are selected as the driven elements of the antenna system, the frequency selectivity of its filtering behavior will be further improved. (3) If a radiative element different from the fan-shaped one could be positioned in the same plane as the driven CLL element and could be designed to act as a near-field parasitic element, it would be possible to construct a compact uniplanar quasi-Yagi configuration and, hence, enable an excellent end-fire radiation performance [31].…”

Section: Discussionmentioning

confidence: 99%

Experimentally Validated, Planar, Wideband, Electrically Small, Monopole Filtennas Based on Capacitively Loaded Loop Resonators

Tang

Ying

Ziolkowski

2016

IEEE Trans. Antennas Propagat.

112

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Section: Discussionmentioning

confidence: 99%

Experimentally Validated, Planar, Wideband, Electrically Small, Monopole Filtennas Based on Capacitively Loaded Loop Resonators

Tang

Ying

Ziolkowski

2016

IEEE Trans. Antennas Propagat.

112

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“…The SSL‐DMR is also helpful for low insertion loss and size miniaturization. Secondly, instead of using the conventional uniform‐impedance resonator (UIR) or stepped‐impedance resonator (SIR), two SISLRs are introduced for bandwidth enhancement and generating another TZ at the higher frequency range of the upper stopband . Therefore, with the aforementioned three TZs, good sideband selectivity and good stopband rejection can be predicted.…”

Section: Proposed Trisection Filter With Ssl‐dmrmentioning

confidence: 99%

Miniaturized wideband bandpass filter with enhanced selectivity and stopband suppression

Huang

Shao

Chen

2018

Micro & Optical Tech Letters

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In this article, a wideband microstrip bandpass filter with cross‐coupling is presented. The filter adopts a short‐stub‐loaded dual‐mode resonator (SSL‐DMR) and two stepped‐impedance spurline resonators (SISLRs) to achieve size miniaturization. Meanwhile, the trisection topology is utilized to achieve two transmission zeros (TZs) on both sides of the passband, with which good sideband selectivity can be exhibited. Furthermore, the SISLRs at the input and output ports can also contribute to another TZ at higher frequency of the upper stopband, which cannot be acquired by utilizing the conventional uniform‐impedance resonator (UIR) or stepped‐impedance resonator (SIR). To verify the aforementioned concept, a filter with a miniaturized size of 0.16 λg × 0.75 λg is designed, fabricated, and measured (λg denotes to the guided wavelength at central frequency). Measured results of the fabricated prototype are in good agreement with the simulated ones. Meanwhile, the fabricated filter achieves a fractional bandwidth about 44.5%, a minimum in‐band insertion loss of 0.6 dB, and a stopband rejection over 20 dB up to the fourth harmonic of the operation center frequency.

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“…Bandpass filters (BPFs) are basic building blocks in the RF front-end and microwave wireless communication systems. Over the past decade, the BPFs with compact size [1], [2], sharp frequency selectivity [3], [4], low insertion loss and wide bandwidth have been studied and exploited extensively, and various design approaches have been proposed [5][6][7][8][9][10][11][12]. An effective way for compact filter design is that modifying the traditional resonator to generate additional resonant modes, resulting in one resonator with more fundamental resonant frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…An effective way for compact filter design is that modifying the traditional resonator to generate additional resonant modes, resulting in one resonator with more fundamental resonant frequencies. Dual-mode resonators and filters are the main research topics in recent years, which have been analyzed deeply and comprehensively in numerous reports with a variety of structures, including rectangle loop resonators [5], meander loops [6], triangular loop structures [7], and stub-loaded resonators [8]. Planar microstrip triple-mode or multi-mode filters have encountered many difficulties in the integrated process as they tend to be large in volume and are not easy for integration.…”

Section: Introductionmentioning

confidence: 99%

Compact Microstrip Triple-Mode Bandpass Filters Using Dual-Stub-Loaded Spiral Resonators

Xu¹,

Li²,

Liu³

et al. 2017

RADIOENGINEERING

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Two new microstrip triple-mode resonators loaded with T-shaped open stubs using axially and centrally symmetric spiral structures, respectively, are presented. Spiraled for circuit size reduction, these two halfwavelength resonators can both generate three resonant modes over a wide frequency band by loading two T-stubs with different lengths. Due to the structural symmetry, they can be analyzed by odd-and even-mode method. To validate the design concept, two compact bandpass filters (BPFs) using these two novel resonators with center frequencies of 1.76 GHz and 2.44 GHz for the GSM1800 and WLAN/Zigbee applications, respectively, have been designed, fabricated and tested. The center frequencies and bandwidths can be tunable through the analysis of resonant frequency responses, fractional bandwidths and external quality factor versus the resonator parameters. The final measured results have achieved good consistence with the simulations of these two BPFs. where he is now a Professor. He has authored and co-authored over 80 papers in peer-reviewed journals and conference proceedings. He received the UESTC Outstanding Graduate Award in 2004, and the Excellent Doctoral Dissertation Award of Sichuan Province of China in 2012. His research interests include antenna array design, array signal processing, and microwave imaging methods.Jing AI was born in Sichuan, China. He received the B.respectively, where he is currently working toward the Ph.D. degree in Electromagnetic Field and Microwave Technology. His recent research interests include microwave and millimeter-wave circuits and systems.

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Miniature Harmonic-Suppressed Microstrip Bandpass Filter Using a Triple-Mode Stub-Loaded Resonator and Spur Lines

Cited by 40 publications

References 9 publications

Experimentally Validated, Planar, Wideband, Electrically Small, Monopole Filtennas Based on Capacitively Loaded Loop Resonators

Experimentally Validated, Planar, Wideband, Electrically Small, Monopole Filtennas Based on Capacitively Loaded Loop Resonators

Miniaturized wideband bandpass filter with enhanced selectivity and stopband suppression

Compact Microstrip Triple-Mode Bandpass Filters Using Dual-Stub-Loaded Spiral Resonators

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