Novel Microstrip Triangular Resonator Bandpass Filter With Transmission Zeros and Wide Bands Using Fractal-Shaped Defection

Xiao, Jian‐Kang; Chu, Qing‐Xin; Zhang, and Sheng

doi:10.2528/pier07081901

Cited by 39 publications

(25 citation statements)

References 11 publications

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“…The passband bandwidths of 41.36% and 27.91% compare well against the fractal filter found in [5] with a 48% bandwidth, and even the non-fractal filter designed in [7] having 39%, 20%, and 27% bandwidths. Furthermore, this design shows a great improvement over the work in [11], where the percent bandwidths are not listed, but the −10 dB bandwidths for the passbands appear to be 30% maximum.…”

Section: Fabrication and Experimental Verificationsupporting

confidence: 58%

“…Recently Sierpinski gaskets have also been used in multi-stub multi-bandpass filters resulting in improved passband responses and tuned notch bands [4]. In [5], two microstrip bandpass filters utilizing multimode operation and achieving wide pass and stop bands use fractal equilateral triangular patch resonators. The authors are able to achieve up to 48% bandwidth using this structure.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Patin¹,

Labadie²,

Sharma³

2010

PIER B

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Abstract-This paper investigates an H-fractal wideband microstrip filter with multi-passbands and a tuned notch band for wireless communication frequencies. The four different filter configurations explored are: symmetric with zero offset, symmetric with nonzero offset, asymmetric with zero offset, and asymmetric with nonzero offset. The effect of H-fractal iterations, fractal scaling parameters, and stub offset on the filter's multi-passband response is presented. A comparison is made to a non-fractal straight stub filter of equivalent length showing improved passband bandwidth while maintaining the same overall response. Then an asymmetry is introduced into the fractal geometry to produce a tuned notch band in the second passband. Two fractal scaling factors are shown to aid in the tuning of the filter notch band. Finally, an asymmetric filter is fabricated on FR-4 substrate and experimentally verified, illustrating that the filter has multi-passbands and can find applications in WiFi/WiMAX transponders.The fabricated filter's first two passbands (with respect to S 11 = −10 dB) are from 2.09 GHz to 3.18 GHz (fractional bandwidth of 1.09 GHz, 41.36%) and from 4.1 GHz to 5.43 GHz (factional bandwidth of 1.33 GHz, 27.91%), both for WiFi applications along with a notch band (S 21 = −3 dB) from 3.3 GHz to 3.94 GHz (factional bandwidth of 0.64 GHz, 17.67%) to suppress co-site WiMAX transmission. The measured data agrees reasonably well with the simulated filter response.

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Section: Fabrication and Experimental Verificationsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Patin¹,

Labadie²,

Sharma³

2010

PIER B

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“…Numerous bandpass filters, adopting different approaches to produce transmission zeros at the lower and upper stopbands have been reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A straightforward way to produce two transmission zeros is to use two shunt open-circuited stubs of different lengths [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…These asymmetric tapped feeding lines were also used with a stepped impedance resonator in a bandpass filter [6][7][8][9]. Another example of the two-path approach was the signal interference technique used for the transversal filters [10][11][12][13]. This technique produces multiple transmission zeros at the lower and upperstopbands.…”

Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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Abstract-A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupledlines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-ofband rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

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“…Dual-mode operation of equilateral triangular patch resonator was theoretically studied in [10], and they proved that dual degenerate mode is obtained by rotation and superposition of fundamental mode. A triangular patch bandpass filter with multi-mode operation employing higher order modes that utilized fractal defection is realized [11][12]. An isosceles triangular patch resonator (ITPR) is presented in [13] with corner"s cut and slits to realize wideband bandpass filter operating in X-band.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Dual-Mode Microstrip Bandpass Filters Using Triangular Patch Resonators

Rao¹

2017

AEM

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In this paper, highly selective dual-mode microstrip bandpass filters are proposed using horizontal and vertical slots formed on the surface of a triangular patch. Slots are responsible for splitting and coupling of dual degenerate modes and also facilitate in controlling their resonant frequencies by varying the dimensions of the slots. Horizontal and vertical slots reroute the direction of the flow of current on the surface of the patch, which results in switching of transmission zeros. Two 2-pole and one 4-pole dual-mode filters are designed, simulated and fabricated. Two-pole filters have transmission zeros on side of the passband and four-pole filter have transmission zeros on both sides of the passband. The designed filters exhibit a fractional bandwidth of less than 7 % and there is a good agreement between simulated and measured results.

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Novel Microstrip Triangular Resonator Bandpass Filter With Transmission Zeros and Wide Bands Using Fractal-Shaped Defection

Cited by 39 publications

References 11 publications

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Investigations on an H-Fractal Wideband Microstrip Filter With Multi-Passbands and a Tuned Notch Band

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Highly Selective Dual-Mode Microstrip Bandpass Filters Using Triangular Patch Resonators

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