Balanced Dual-Band BPF using only Equal-Electric-Length SIRs for Common-Mode Suppression

Hsu, Chih-Chan; Lee, C.-H.; Chen, H.-H.

doi:10.1163/156939310791036241

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…The CM suppression with the use of the double-sided parallel-strip line [3] was improved at the cost of increasing the circuit size. Other CM suppression methods such as the use of coupled line resonators, [4], coupled stepped-impedance resonators (SIRs), [5] multisection resonators, [6] lambda/4 stepped-impedance resonators, [7] equal-electric-length SIRs, [8] branch-line structure, [9] and electrically small open resonators [10] were also reported. To further improve the CM suppression level, the recent balanced BPFs [11][12][13][14][15] were designed by loading the proper open stub, capacitor or resistor in series at the center of the half-wavelength resonator or SIR, which can suppress the CM noise while keeping the differential-mode (DM) response almost unchanged.…”

Section: Introductionmentioning

confidence: 99%

High selectivity and common-mode suppression combline balanced BPF

Deng

Zhao

et al. 2013

Journal of Electromagnetic Waves and Applications

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In this study, new balanced microstrip bandpass filter (BPF) based on steppedimpedance combline structure is proposed with high selectivity and high commonmode (CM) suppression performance In the beginning, a single-ended compact stepped-impedance resonator (SIR) combline BPF with enhanced performance including low insertion loss, sharp skirt and wide stopband response is designed by consisting of an array of short quarter-wavelength bi-section SIRs with a new scheme of tapped-transformer coupling at input and output ports. Under CM excitation, no special consideration or design procedure is required to suppress the CM, and the CM suppression is the nature of the parallel-coupled filter. Finally, the second-and third-order SIR combline balanced BPFs for WLAN application, without loss of generality, have been designed and implemented. The simulated and measured results show a good agreement and validate the proposed theory.

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Section: Introductionmentioning

confidence: 99%

High selectivity and common-mode suppression combline balanced BPF

Deng

Zhao

et al. 2013

Journal of Electromagnetic Waves and Applications

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“…Basically, those balanced circuits designed with careful DM operation concepts [1] have good immunity from CM noises, cancellation of even-harmonic signals, elimination of via holes and etc.. Therefore, RF/Microwave components, such as antennas [2,3], mixers [4][5][6], BPFs [7][8][9][10][11][12][13][14][15], and so on, are realized by their balanced counterparts. Among the conventional mobile devices, the SAW filters are usually employed in front-end modules with operation frequency not exceeding several gigahertzs (roughly around 3 GHz) because of their physical nature.…”

Section: Introductionmentioning

confidence: 99%

“…Through the utilization of bi-section quarter-wavelength (λ/4) stepped-impedance resonators (SIRs) and folded feed lines, the dualband balanced BPF is achieved [11] but sacrifices the via-free property. Some balanced filters [12,13] aim at dual-band applications but not at extended DM stopband. In [14,15], Wu et al adopted fully differential filters based on quasi-lumped resonators or transformers still without optimizing the out-of-band performance.…”

Section: Introductionmentioning

confidence: 99%

Stopband-Extended Balanced Filters Using Both Λ/4 and Λ/2 Sirs With Common-Mode Suppression and Improved Passband Selectivity

Lin¹,

Yeh²

2012

PIER

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Abstract-Benefitting from the simultaneous utilization of quarterwave (λ/4) and half-wave (λ/2) microstrip resonators, a via-free balanced bandpass filter (BPF) with direct-coupled scheme is presented in this study. In the beginning, a single-ended filter with transmission zeros (TZs) is newly proposed and the mechanism of creating two TZs around the passband without necessitating cross couplings is adopted. The TZs can be made structure-inherent based on the coexisted out-of-phase couplings among a coupled-resonator pair. On the foundation of the presented single-ended filter, a balanced filter featuring extended differential-mode (DM) stopband, good commonmode (CM) suppression, and improved passband selectivity has been designed and implemented. The DM stopband extension is achieved by misaligning the higher-order harmonic frequencies of each resonator in the DM bisected circuit while the CM suppression is accomplished by both harmonic misalignment and careful designed coupled structure in the CM bisected circuit. Eventually, a demonstrated balanced filter centering at 1.5 GHz possesses DM stopband extended up to 8f d 0 , where f d 0 denotes the DM operation frequency, and its CM rejection ratio (CMRR) within DM passband better than 51.9 dB is attained. For measurement convenience, the DM characterizations have been accomplished by 2-port network analyzer with simple rat-race baluns and are found relatively accurate within the −15 dB bandwidth of the utilized baluns.

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“…In the past few years, balanced BPFs have received increasing attention [2][3][4][5][6][7][8][9][10][11][12]. These balanced BPFs have been constructed using coupled-line structures [2,3], branch-line structures [4,5], and, for the most part, multi-section resonators [6][7][8][9][10][11][12]. Each of these multi-section resonators does not form a closed loop and hence can be referred to as an open-loop resonator.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, closed-loop resonators, alternatively called ring resonators, have been widely employed to build single-ended BPFs as well [18][19][20][21][22][23][24][25]. Although open-loop resonators have also been frequently used to construct balanced BPFs, from singleband [6,7] to dual-band ones [8][9][10][11][12], so far closed-loop resonators have not yet, however. Hence, the purpose of this paper is to show that closed-loop resonators can also be employed to design new balanced BPFs in a clever manner.…”

Section: Introductionmentioning

confidence: 99%

Balanced Single- And Dual-Band BPFS Using Ring Resonators

Lee¹,

Hsu²,

Chen³

et al. 2011

PIER

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Abstract-This paper presents new balanced single-and dual-band bandpass filters (BPFs), both of which are constructed using two ring resonators. For each BPF, open-circuited stubs are added to one of the two resonators so that the transmitted common-mode (CM) signals can be attenuated, and source-load coupling is established so that two transmission zeros are generated near the edges of each desired differential-mode (DM) passband to sharpen the passband selectivity. The measurement agrees well with the simulation. For the single-band BPF, the measured minimum DM insertion loss is 1.4 dB in the DM passband, in which the CM suppression is larger than 41.6 dB. For the dual-band BPF, the minimum DM insertion losses are 1 and 1.35 dB in the first and second passbands, respectively, in which the CM rejections are larger than 29 and 22 dB.

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Balanced Dual-Band BPF using only Equal-Electric-Length SIRs for Common-Mode Suppression

Cited by 9 publications

References 22 publications

High selectivity and common-mode suppression combline balanced BPF

High selectivity and common-mode suppression combline balanced BPF

Stopband-Extended Balanced Filters Using Both Λ/4 and Λ/2 Sirs With Common-Mode Suppression and Improved Passband Selectivity

Balanced Single- And Dual-Band BPFS Using Ring Resonators

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