Compact low‐pass filter with ultra‐wide stopband using analysed triangular‐shaped resonator

Lotfi, Saeedeh; Hayati, Mohsen

doi:10.1049/el.2017.1169

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Also, a neuro-based approach to designing a Wilkinson power divider is published in [22], which is composed of two lowpass filters instead of two quarter wavelength line in conventional circuit. Applying microstrip resonators is useful in designing good performance RF circuits as in [23][24][25][26]. Another Wilkinson power divider with harmonic suppression and bandpass filtering response is suggested in [27], which used open and short stubs and even-odd mode analyses, but this design has a large circuit size.…”

Section: Introductionmentioning

confidence: 99%

Design of a miniaturized planar microstrip Wilkinson power divider withharmonic cancellation

Lotfi¹,

Roshani²,

Roshani³

2020

Turk J Elec Eng & Comp Sci

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In this paper, a compact microstrip Wilkinson power divider is designed and proposed using rectangularshaped resonator cells. The presented resonator cells are used instead of quarter-wave length branches in the traditional structure to reduce the circuit size, increase the bandwidth, and eliminate the unwanted harmonics. The designed resonator behavior is studied analytically and the locations of transmission zeros are investigated using transfer function and LC equivalent circuit methods. The proposed power divider (PD) operates at 2 GHz frequency and suppresses the 2nd to 14th unwanted harmonics. The proposed PD achieves approximately 50% size reduction and 40% fractional bandwidth (FBW). The abilities of desirable size reduction and harmonic suppression along with simple structure and wide FBW make the proposed divider a good choice for the modern communication systems, such as multistage power amplifier applications. The proposed divider is implemented and measured. The measurement results verify the simulation responses.

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Section: Introductionmentioning

confidence: 99%

Design of a miniaturized planar microstrip Wilkinson power divider withharmonic cancellation

Lotfi¹,

Roshani²,

Roshani³

2020

Turk J Elec Eng & Comp Sci

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“…Owing to the excellent properties, such as low profile and cost, compact size, and easy integration with other devices, the microstrip filters are extensively used in the wireless and telecommunication systems including 4G, WiFi and sensing radars. To satisfy various requirements, the microstrip filters with individual characteristics have been designed, including low-pass filters [1,2], balanced bandpass filters (BPFs) [3,4], reconfigurable dual-band BPFs [5,6], and stopband filters [7,8], respectively.…”

Section: Introductionmentioning

confidence: 99%

Wideband bandpass filters with reconfigurable bandwidth and fixed notch bands based on terminated cross‐shaped resonator

Cheng

Cheong

et al. 2019

IET Microwaves, Antennas & Propagation

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In this study, a series of wideband bandpass filters (BPFs) with reconfigurable bandwidth and two fixed notch bands are presented. The fundamental topology is based on a new terminated cross‐shaped resonator (TCSR), which has three poles and four zeros. With the assistance of two symmetrical parallel coupled‐lines, another four poles and two zeros are introduced. As such, a notched‐band bandpass filter with multiple transmission poles and zeros are achieved. To realise the reconfigurable bandwidth, four PIN diodes are used. By controlling the status (switching on/off) of these PIN diodes, three reconfigurable‐bandwidth states can be implemented while the notch bands and centre frequency are maintained unaltered. Meanwhile, it is also found that the lower bandwidth edge of the proposed filter can be independently reconfigurable by inserting a capacitor into the lower stub of the novel TCSR, while the notch bands are kept unchanged. For validation, three prototypes are designed, fabricated, and measured. The measured results agree well with theoretical analysis and therefore verify the simple designing approach of reconfigurable BPFs.

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“…In Reference , a DGS is presented that the selectivity of LPFs can be controlled easily, whereas the band width is fixed. In References , the transfer function and LC equivalent circuit is used to obtain TZs and analyze the design theory. In Reference , a LPF is proposed, that is, consist of symmetrical cascaded modified hairpin resonators and U‐shaped resonators.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of microstrip lowpass filter using asymmetric hairpin resonator

Vaezi

Gharakhili

2019

Int J RF Microw Comput Aided Eng

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In this letter, a compact microstrip lowpass filter (LPF) is designed using serial connecting of two modified asymmetric hairpin resonators. The proposed design is consists of four open-circuited stubs that are used to suppress spurious harmonics in the stopband. The proposed filter has wide-stop band with attenuation level better than −28 dB from 2.16 up to 26.1 GHz and sharp roll-off. The proposed LPF has −3 dB cutoff frequency equal to 2.11 GHz, wide stopband width around 12th harmonic suppression and insertion loss less than 0.1 dB at about 85% of the passband. The excellent agreement is observed between the simulated results and measured values of the fabricated LPF.insertion loss, low-pass filter, return loss, suppression factor, transition band

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Compact low‐pass filter with ultra‐wide stopband using analysed triangular‐shaped resonator

Cited by 12 publications

References 7 publications

Design of a miniaturized planar microstrip Wilkinson power divider withharmonic cancellation

Design of a miniaturized planar microstrip Wilkinson power divider withharmonic cancellation

Wideband bandpass filters with reconfigurable bandwidth and fixed notch bands based on terminated cross‐shaped resonator

Design and fabrication of microstrip lowpass filter using asymmetric hairpin resonator

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