High‐selectivity wideband balanced bandpass filters using symmetrical multi‐mode resonators

Feng, Wenjie; Che, Wenquan; Gu, Liming; Xue, Quan

doi:10.1049/iet-map.2012.0444

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…On the other hand, filters are essential components of any communications system. In this way, many papers have been published in recent years dealing with the appropriate design of a variety of microwave differential balanced filters, including narrow band [1–3], wideband [4–6] or dual‐band [7, 8] implementations. All those examples correspond to conventional microstrip technology, although differential devices based on LTCC [9] or SIW technologies are also available [10].…”

Section: Introductionmentioning

confidence: 99%

Common‐mode suppression for balanced bandpass filters in multilayer liquid crystal polymer technology

Fernández‐Prieto

Qian

Martel³

et al. 2015

IET Microwaves, Antennas & Propagation

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A new multilayer differential transmission line for common-mode suppression fabricated using an organic liquid crystal polymer multilayer substrate is proposed and analysed. The structure consists of a pair of parallel strip lines printed on the top layer of the substrate that are capacitively coupled to conductor patches periodically etched in an intermediate interface. These patches are symmetrically connected to a solid ground plane by means of short-circuited high-impedance microstrip line sections and metalised via holes. The differential signal supported by the coupled strips is not significantly affected by the presence of the middle layer layout, whereas the common-mode signal propagation is strongly suppressed within a certain frequency band. When this structure is cascaded with a simple differential bandpass filter exhibiting poor common mode rejection, a good common mode response is achieved within the unperturbed differential passband. The measurements confirm a significant enhancement of common-mode rejection thanks to the use of the proposed differential lines.

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Section: Introductionmentioning

confidence: 99%

Common‐mode suppression for balanced bandpass filters in multilayer liquid crystal polymer technology

Fernández‐Prieto

Qian

Martel³

et al. 2015

IET Microwaves, Antennas & Propagation

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“…Multi-mode resonators (MMR) with controlled resonant frequencies have been widely used in the wideband single-ended filter designs with compact size and good electrical performance [6,7]. Recently, there has been research on the application of the MMRs in the wideband balanced filter designs [8,9]. However, these designs do not provide satisfactory in-band common-mode (CM) suppression because of the difficulty in suppressing the odd-mode resonances.…”

Section: Introductionmentioning

confidence: 99%

High selectivity and common‐mode suppression wideband balanced bandpass filter using slotline resonator

Deng

Zhao

et al. 2015

IET Microwaves, Antennas & Propagation

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Novel wideband balanced bandpass filter with high selectivity and common‐mode (CM) suppression is constructed with slotline resonator. When the intersection points of the microstrip feedline and slotline resonator are close to the midpoint of the slotline resonator, the coupling between the fundamental mode of the slotline resonator and microstrip feedline can be maximised, whereas the second mode can be suppressed. Making use of this feature, the third‐order wideband filter with low insertion loss, wide upper‐stopband and flat group delay is designed by using the slotline resonator and two quarter‐wavelength microstrip resonators paralleled to the slotline resonator with tapped‐line coupling at their short‐circuited ends. Based on the third‐order single‐ended filter structure, a novel balanced ﬁlter with a 1 dB fractional bandwidth up to 72% is designed with low insertion loss and enhanced CM suppression. To improve the selectivity, the fifth‐order wideband balanced filter with wide upper‐stopband is designed with parallel coupling structure between two slotline resonators. The corresponding CM suppression is better than 42 dB within the whole differential mode passband. The wideband balanced filter is designed and fabricated, and good agreement between measurements and simulations is obtained.

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“…There have been researches on the application of the microstrip MMR with controllable resonant frequencies in the wideband balanced filters. In and , the compact wideband balanced BPFs were presented based on the third‐mode stub loaded microstrip resonator and two new symmetrical microstrip MMR, respectively. Good DM transmission characteristic and broadband CM suppression are easily achieved.…”

Section: Introductionmentioning

confidence: 99%

High CM suppression wideband balanced microstrip BPF using dual‐mode resonator

Deng

Zhao

et al. 2014

Micro & Optical Tech Letters

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In this letter, a novel high selectivity and common‐mode (CM) suppression wideband balanced microstrip passband filter (BPF) is proposed using the short stub centrally loaded short‐ended resonators (SSCLSR). The odd‐mode resonant frequency of the SSCLSR can be flexibly controlled by the short stub, whereas the even‐mode one is fixed. First, the wideband single‐ended BPF are designed based on the microstrip SSCLSR with the parallel coupled microstrip line input/output (I/O). Two transmission zeros near the passband edges can be generated due to the main path signal counteraction and source‐loaded coupling. Further, the CM equivalent half circuits of the balanced BPF based on the wideband single‐ended BPF are investigated in detail. Thus, a wideband balanced BPF with high CM suppression within the passband is designed, fabricated, and measured. Good agreement between simulated and measured results is obtained. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2940–2944, 2014

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High‐selectivity wideband balanced bandpass filters using symmetrical multi‐mode resonators

Cited by 16 publications

References 20 publications

Common‐mode suppression for balanced bandpass filters in multilayer liquid crystal polymer technology

Common‐mode suppression for balanced bandpass filters in multilayer liquid crystal polymer technology

High selectivity and common‐mode suppression wideband balanced bandpass filter using slotline resonator

High CM suppression wideband balanced microstrip BPF using dual‐mode resonator

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