Design of Dual-Band Bandpass Filters Using Stub-Loaded Open-Loop Resonators

Mondal, Priyanka; Mandal, Mrinal Kanti

doi:10.1109/tmtt.2007.912204

Cited by 202 publications

(126 citation statements)

References 15 publications

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“…For obtaining a compact size, uniform half-wavelength resonator is bent and then the traditional E-shaped resonator is formed. Actually, this structure may also be considered as a stub-loaded resonator [22][23][24]. In previous reports, traditional E-shaped resonator structures are basically used for the design of narrow band (fractional bandwidth less than 10%) filters and seldom be used in the design of wideband filters [25][26][27].…”

Section: Analysis Of Dual-mode E-shaped Resonatormentioning

confidence: 99%

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

Wu¹,

Liao

Xiong³

et al. 2013

PIER C

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Abstract-Two ultra-wideband (UWB) microstrip bandpass filters (BPFs) are proposed by using tunable E-shaped dual-mode microstrip Stepped-Impedance Resonator (SIR). For the lower band filter measurement results show there is a passband of 3.1 GHz to 5.2 GHz and its 3 dB fractional bandwidth is 51%. The UWB upper band filter may be obtained by tuning E-shaped SIR. The measurement results show there is a passband of 6 GHz to 10.6 GHz and its 3 dB fractional bandwidth is 55%. Compared with the similar investigation using the cascade of electromagnetic band gap (EBG)-embedded multiple-mode resonator (MMR) and fork resonator, the proposed approach has some advantages, such as easier adjustment of bandwidths, better passband performances and smaller size etc..

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Section: Analysis Of Dual-mode E-shaped Resonatormentioning

confidence: 99%

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

Wu¹,

Liao

Xiong³

et al. 2013

PIER C

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“…For example by using of the microstrip open loop resonators two different dual band bandpass filters operated at 2.4 GHz and 5.7 GHz are designed in [1], [2]. In [3] a compact dual band bandpass filter with small fractional bandwidth using open loop resonators is proposed.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

Salehi¹,

Abiri²,

Noori³

2014

IJCEE

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In this filter an undesired return loss is seen, where the stopband between two passband is not enough wide. In [4] a dual band band pass filter with very large size and large insertion losses is offered to operate at 1GHz and 2GHz. In [5] the step impedance coupled lines, short circuited and open circuited stubs are used to design a dual band bandpass filter with asymmetric structure which has high insertion losses. In [6] using the step impedance resonators with very large sizes a high losses dual band bandpass filter is designed for ultra wideband applications. In [7] using the open loop resonators and half wave step impedance resonators a large insertion losses dual band bandpass filter is proposed. In [8] a large size step impedance resonator is used to design a dual band bandpass filter with four transmission zeroes. But it has large insertion loss while its large size problem is not solved. In [9] the asymmetric SIRs and open stubs are used to control the transmission zeros of a proposed dual band bandpass filter. Another problem of this filter is its small rejection-band between the two passbands. In [10] a compact dual band bandpass filter is designed by combining bandpass and band-stop filters to operate at 2GHz and 2.2GHz. In this structure low insertion losses are obtained in the both passbands. But the passbands have the small fractional bandwidths. In [11] a double-slot-loaded resonator is used for exploration of a dual band bandpass filter with two closely spaced passbands operated at 2.1GHz and 2.6GHz. In this structure a large insertion loss at second passband is obtained. In [12] a small fractional bandwidth dual band bandpass filter is designed and fabricated using open loop resonators for multimode WLANs. This filter has two undesired return loss in the both passbands.In this paper a compact microstrip filter is designed using two open loop resonators that connected together with mixed coupling. The loops are loaded by simple open stubs. Also in the proposed structure two new tapped lines feed structures are added at the input and output ports to improve impedance matching and achieve dual band bandpass response with good performance in terms of the low insertion losses and the wide fractional bandwidth. This paper is organized as follows: Section II describes design and structure, Section III introduces the simulation results, and Section IV presents the conclusion. II. DESIGN AND STRUCTUREThe open loop resonator loaded by three open end stubs is shown in Fig. 1. A novel step impedance taped line feed structure is connected to the open loop resonator to control the resonance frequencies. This taped line feed structure is added to achieve a good impedance matching too. The proposed resonator is divided to nine paths with different impedances and admittances. International Journal of Computer and Electrical Engineering, Vol. 6, No. 3, June 2014 248 DOI: 10.7763/IJCEE.2014.V6.832The resonance frequencies of the proposed resonator as shown in Fig. 1 can be controlled by adjusting its input im...

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“…Being one of the key components in communication systems, as the filters improve the performance and incorporate additional features, demand for dual band filters increases [1][2][3]. In addition, with the advent of the modern wireless communication technologies, single transceivers operating at multiple frequency bands have become popular [4,5]. However, there are challenges in the design of dual-band filter supporting compact size, low insertion loss in pass bands, high quality factor and stop-band characteristics with high insertion loss and high skirt selectivity [6][7][8][9][10].…”

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 Filters Using Stub-Loaded Open-Loop Resonators

Cited by 202 publications

References 15 publications

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

Design Filters Using Tunable E-Shaped Dual-Mode Resonators for Lower-Ultra-Wideband and Upper-Ultra-Wideband Applications

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

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

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