Design of Dual-Band Bandpass Filter With Wide Upper Stopband Using Sir and Gsir Structures

Mashhadi, Mostafa Rajabi; Komjani, Nader

doi:10.2528/pierc12073108

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…Suppression of spurious frequencies in this filter is achieved using stub‐loaded section. In , the SIR and the GSIR structures are used simultaneously to achieve a wide upper stopband.…”

Section: Introductionmentioning

confidence: 99%

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Mashhadi

Komjani

2014

Micro & Optical Tech Letters

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In this letter, a new dual‐band bandpass filter with multispurious suppression is proposed using novel stepped‐impedance resonators (SIRs). The proposed resonator is composed of a SIR with embedded bandstop structure. A third‐order filter is designed and fabricated that shows a rejection level of 30 dB up to 20 GHz (8.33f1). © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:603–606, 2014

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“…Suppression of spurious frequencies in this filter is achieved using stub‐loaded section. In , the SIR and the GSIR structures are used simultaneously to achieve a wide upper stopband.…”

Section: Introductionmentioning

confidence: 99%

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Mashhadi

Komjani

2014

Micro & Optical Tech Letters

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“…In order to suppress the spurious passbands, many methods has been presented such as methods using the stepped-impedance resonators and grounded-step-impedance resonators [11,18,20,23,25,26], fractal-shaped micro-strip [12], multiorder resonator [13], T-stub/DGS [14], antisymmetric modied antiparallel coupled-lines [15,19,21], branch stubs co-via structure [22], DGS and Spur-line Coupling Structures [24], etc.. However, the size of structures above is not small enough and the higher frequency spurious passbands can not also be suppressed efficiently [10][11][12][13][14][15][18][19][20][21][22][23][24][25][26]. Openstub and air-bridge have been introduced to create transmission zeros around 3f 0 and 5f 0 in a compact filter [16].…”

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confidence: 99%

Compact Bandpass Filter With Wide Stopband Using Rectangular Strips, Asymmetric Open-Stubs and L Slot Lines

Xu¹,

Mi²,

Wang³

et al. 2013

PIER C

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A novel slot-line filter with stop-band up to 30 GHz is proposed in this paper, and the theoretical analysis is illustrated in detail. This filter is designed on a Rogers RT/duroid 5870 substrate. The rectangular micro-strips can generate transmission zero to give a great suppression for the spurious response around 5f 0 while the L slot lines can create transmission zeros to suppress the spurious response around 7f 0 , 9f 0 and 11f 0. f 0 is 2.43 GHz in this paper and represents the center frequency of the main passband. The compact size of this novel filter is 23.7 mm * 14.725 mm (0.152λ * 0.103λ (λ is the working wavelength of this filter)). Besides, the external quality factor of this filter can be as high as about 29.6. To demonstrate the transmission function, the compact filter has been fabricated and the measured results show the feasibility of this structure. 1. INTRODUCTION With the development of modern communication technology, WiFi and blue-tooth applications require small-sized filters with wide stopband. Microstrip bandpass filters with low insertion loss, compact size and high Q play more and more important roles in mobile communication systems and radio frequency (RF) front/end of the wireless communication systems [1-4]. Planar bandpass filters (BPFs) having compact size and a very wide stopband are very popular to implement the radio frequency (RF) front end in microwave communication systems [5]. As is konwn to us that the micro-strip filter

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“…Even though [18,19] have been designed using dual-band BPF with an improved spurious free upper stop band, they suffer from large effective geometrical area. In the present work, spurious free and wide upper stop band is achieved through compact folded SIR configuration.…”

Section: Introductionmentioning

confidence: 99%

“…In [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], several techniques relating to planar dual-band filter design have been proposed. In particular, the commonly used approach is to use planar structures to achieve dual-band filter characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Filter for Wimax and Wlan With Improved Upper Stop Band Performance

Kamma¹,

Reddy²,

Parmar³

et al. 2014

PIER C

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Abstract-In this paper, a novel and compact dual-band filter with enhanced upper stop characteristics has been presented. Dual band pass filter characteristics are achieved by introducing transmission zero (TZ) in pass band of band pass filter (BPF). The wide band pass filter (BPF) is implemented by combining low pass filter characteristics (i.e., stepped impedance resonator) and high pass filter characteristics (i.e., short stubs). Closed rectangular ring resonator (CRRR) and open loop rectangular ring (OLRR) combination is used to produce two transmission zeros (TZs). One TZ is placed on the pass band of BPF such that resultant filter characteristic consists of two pass band. However, the second TZ is placed at edge of the pass band in BPF to improve skirt selectivity. The two pass bands are designed to cover two popular wireless bands namely WiMAX (center frequency f 1 (3.5 GHz) and WLAN (center frequency f 2 (5.7 GHz)) bands, i.e., 3.35-3.65 GHz and 5.5-5.85 GHz respectively. Equi-ripple low pass stepped impedance resonator (SIR) filter response is responsible for improved and spurious free upper stop band (> 20 GHz, i.e., > 6f 1 ) and also provides sharp skirt attenuation at upper stop band. The proposed filter is implemented on an RT/Duroid 5880 (ε r = 2.2) substrate with thickness of 0.785 mm and surface area of 19 × 12 sq · mm. Good agreement between simulated and measured results ensures that the proposed filter is a suitable candidate for modern dual band communications.

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Design of Dual-Band Bandpass Filter With Wide Upper Stopband Using Sir and Gsir Structures

Cited by 7 publications

References 18 publications

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Design of dual‐band bandpass filter with improved upper stopband using novel stepped‐impedance resonator

Compact Bandpass Filter With Wide Stopband Using Rectangular Strips, Asymmetric Open-Stubs and L Slot Lines

Dual-Band Filter for Wimax and Wlan With Improved Upper Stop Band Performance

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