Miniaturization Design of Full Differential Bandpass Filter With Coupled Resonators Using Embedded Passive Device Technology

Wu, Sung‐Mao; Kuo, Chun-Ting; Lyu, Pei-Yu; Shen, Yu Li; Chien, Ching-I

doi:10.2528/pier11091404

Cited by 16 publications

(12 citation statements)

References 25 publications

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“…Thus, M is the most important factor for designing a WPT system as it relates directly to the coupling coefficient and overall efficiency. Owing to coupled resonator theory [15], the coupling coefficient, k, can be expressed by the following:…”

Section: Simplified Analysis Of Hf-band Wpt Systemmentioning

confidence: 99%

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Jang¹,

Lee²,

Yoon³

2012

PIER

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Abstract-High-frequency (HF) band wireless power transfer systems offer the promise of cutting the last cord, allowing users to seamlessly recharge mobile devices as easily as wireless communication. Yet there are still many technical issues that need to be overcome. Among them, one of the most difficult problems is maintaining impedance match over a short range, where the distance between a transmitter and receiver could vary. In this paper, the effect of impedance mismatch of a HFband wireless power transfer system is carefully investigated and two compensation methods are suggested to overcome this within a short range, where frequent impedance mismatch can occur. Each method has pros and cons. In order to verify the feasibility of the proposed methods, HF-band wireless power transfer systems, with a pair of rectangular loop resonators, were designed. The efficiency and input impedance variation were simulated and measured. From these results, proposed methods show enhanced efficiency performance than a typical wireless power transfer system without any compensation circuits.

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Section: Simplified Analysis Of Hf-band Wpt Systemmentioning

confidence: 99%

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Jang¹,

Lee²,

Yoon³

2012

PIER

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“…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%

“…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%

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 [8,9], many kinds of coupled structures are used for balanced filters applications. In [10,11], balanced coupled-resonator BPFs with common-mode suppression and stopband extension are constructed based on stepped-impedance resonators and in [12,13], various types of full differential bandpass filters are designed and fabricated. In [14], a new technique for realizing a fully differential filter using an operational amplifier (op amp) without common-mode feedback (CMFB) is presented.…”

Section: Introductionmentioning

confidence: 99%

“…These filters should be able to produce the desired differential-mode frequency responses and reduce the common-mode signal interference at the same time, which is essential in increasing the signal-to-noise-ratio (SNR) in the receiver and improving the efficiency of the dipole antenna in the transmitter. In recent years, lots of structures have been demonstrated for differential bandpass filter (BPF) design, which are fabricated with single band, dual bands, wide band and improved common-mode suppression characteristics [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In [1], a novel ultrawideband (UWB) differential filter is presented based on doublesided parallel-strip lines.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Differential Bandpass Filter Based on T-Shaped Stubs and Single Ring Resonator

Wang¹,

Kang²,

Guo³

et al. 2013

PIER Letters

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Abstract-A wideband differential bandpass filter (BPF) with differential mode passband and common mode suppression is proposed and implemented on microstrip lines for wideband application in this letter. The initial BPF is similar to a single ring resonator with two unequal feed lines which have 180 • separation and T-shaped stubs are loaded on the ring resonator to form an improved one for better performances. The lengths and widths of these stubs can be adjusted to produce a highly selectivity under the differential mode and improved attenuation under the common mode. This simple, compact structure is easy for construct without any coupling structure. Finally, a microstrip differential wideband BPF is designed, simulated, fabricated, and measured. The presented differential BPF has a 3-dB fractional bandwidth (FBW) of 38% for the differential mode and insertion loss greater than 17 dB for common mode. Good agreement between simulated and measured results is obtained.

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Miniaturization Design of Full Differential Bandpass Filter With Coupled Resonators Using Embedded Passive Device Technology

Cited by 16 publications

References 25 publications

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

Hf-Band Wireless Power Transfer System: Concept, Issues, and Design

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

A Wideband Differential Bandpass Filter Based on T-Shaped Stubs and Single Ring Resonator

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