Low insertion loss microstrip dualband lowpass‐bandpass filter with controllable passband frequencies

Chen, Fu‐Chang; Shao, Qiang

doi:10.1002/mop.29936

Cited by 10 publications

(9 citation statements)

References 6 publications

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“…Recently, lowpass-bandpass response multiband circuits, such as those presented by [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], and [30], have been developed. Each of [14], [17], and [23] was lowpass-bandpass diplexer (LBD) for two different band channel application.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to [14], [17], and [23] used a directed-feed structure for BPF, and its input or output resonator was also shared to achieve the required shunt-to-ground capacitance of LPF, featuring a high circuit integration. A lowpass-bandpass triplexer (LBT) was proposed by [20], and [15], [16], [21], [24], [29], and [30] proposed dual-band lowpass-bandpass filters (DB-LBFs), triple-band lowpass-bandpass filters (TB-LBFs), and quad-/five-band lowpass-bandpass filter. A previous study [22] introduced a switchable lowpass-bandpass filter, and [18] presented reconfigurable DB-LBF that provided four-mode functions, with an independent design for LPF and BPF responses in an effective simplified design process.…”

Section: Introductionmentioning

confidence: 99%

“…However, the DB-LBF required additional BPF resonators outside the LPF circuit, resulting in a low circuit integration or a large circuit size. In addition, [21] presented a highly integrated DB-LBF, with LPF and BPF sharing the same circuit; but its LPF and BPF responses could not be independently designed. For example, when one LPF or BPF response was indicated, the other response was determined under the indicated response; this design offered little flexibility.…”

Section: Introductionmentioning

confidence: 99%

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Improved Designs for Highly Integrated Lowpass–Bandpass Filters

et al. 2023

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This study presents three dual-band lowpass-bandpass filters. The first handles lowpass and bandpass bands through its fifth-order and third-order Chebyshev filter responses, respectively. This filter uses three circuits to achieve flexibility in cutoff frequencies and fractional bandwidths. The second is a higher-order filter: it is a dual-band filter with ninth-order lowpass and fifth-order bandpass responses. In general, an extra 50-transmission line might be required to connect each port conveniently to an external circuit for the first or second proposed filter, which could increase the circuit area. The third is a dual-band filter with a λ/4 impedance transformer near each port to facilitate connections with external circuits. Each of the proposed dual-band lowpass-bandpass filters has a systematic design procedure when the lowpass and bandpass band responses are given separately. In addition, the proposed filters can provide rapid prediction through the use of ideal circuit simulations instead of full-wave simulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Designs for Highly Integrated Lowpass–Bandpass Filters

et al. 2023

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“…In mixers, lowpass and bandpass filters are used to separate intermediate frequency (IF) and local oscillator (LO) frequency. In 2016 [13], combination of lowpass and single bandpass filter is presented using stub-loaded transmission lines and stepped-impedance stubs. The impedances and lengths of the transmission lines are used to control the resonance frequencies, while shunting stubs are used stop band attenuation improvement.…”

Section: Introductionmentioning

confidence: 99%

A compact lowpass/dual-band bandpass filter for microwave application

Sadwal

Bage

2021

FACTA U EE

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A combination of lowpass and dual band bandpass filter with improved selectivity is presented in this manuscript. Two circular split ring resonators which are connected at the upper side, provide a lowpass filter characteristics. In order to achieve combined lowpass with dual passband response two L-shape stubs are incorporated into the lowpass filter structure. The parametric analysis of the proposed filter has been carried out using CST microwave studio. The numerical result shows a 3-dB cutoff frequency for lowpass at 1.22 GHz, first and second passband resonant frequencies are 2.44 GHz and 3.7 GHz respectively. The proposed filter is compact and overall size of the proposed filter is 32.9 mm?15mm.

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“…In some filters, low-pass and bandpass responses have been achieved in a single layout, but the responses cannot be switched from one type to the other. For example, a dual-band filter which has both the low-pass and bandpass responses present simultaneously has been reported in [10]. The positions of the lowpass and bandpass can be controlled by changing the impedances and lengths of the transmission lines, but it requires refabricating the filter.…”

Section: Introductionmentioning

confidence: 99%

Compact tunable low‐pass to CFBW bandpass switchable filter using concentric resonators

Kumar

Singh²

2018

IET Microwaves, Antennas & Propagation

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A tunable low‐pass to bandpass switchable filter is presented in this study. The proposed structure consists of two concentric resonators. Along with varactors, outer resonator is also loaded with a PIN diode switch. The switching conditions of the PIN diode – OFF lead to a low‐pass filter (LPF) and ON lead to a bandpass filter. At the ON condition of the switch, the outer resonator behaves as two resonators which are coupled to each other through two ways – inductively coupled through via hole and capacitively coupled through the varactor loaded between the resonators. The coupling coefficients between the two grounded resonators are controlled using varactors to achieve constant fractional bandwidth (CFBW) tunability. The third CFBW tunable band with bandpass characteristic having three transmission zeros across the passband is achieved using inductively coupled inner resonators. A filter is designed, simulated and fabricated. The response shows a tunable LPF having a tuning range of 0.55–1.4 GHz. One tunable CFBW bandpass response with a tuning range of 0.850–1.25 GHz is achieved with a CFBW of 64%. The third tunable band with bandpass filtering behaviour is achieved with a tunable range of 1.04–1.6 GHz with a CFBW of 13.4%.

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Low insertion loss microstrip dualband lowpass‐bandpass filter with controllable passband frequencies

Cited by 10 publications

References 6 publications

Improved Designs for Highly Integrated Lowpass–Bandpass Filters

Improved Designs for Highly Integrated Lowpass–Bandpass Filters

A compact lowpass/dual-band bandpass filter for microwave application

Compact tunable low‐pass to CFBW bandpass switchable filter using concentric resonators

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