Compact superconducting dual‐band bandpass filter by combining bandpass and bandstop filters

Heng, Yong; Guo, Xubo; Cao, Bisong; Wei, Bin; Zhang, Xiaoping; Zhang, Guoyong; Song, Xiaoke

doi:10.1049/el.2013.2429

Cited by 22 publications

(20 citation statements)

References 5 publications

(8 reference statements)

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“…The susceptance slope parameters of the stubs for a six‐stub filter with different bandwidths are calculated, as listed in Table . The characteristic impedances of the λ g 0 / 4 connecting lines are all set to 50 Ω for convenience . The corresponding stub linewidths ( W i ) on a 0.5‐mm‐thick LaAlO 3 substrate ( ɛ r = 23.8) are also calculated and listed.…”

Section: Design Of the Moderate‐wideband Superconducting Filtermentioning

confidence: 99%

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Design of a moderate-wideband superconducting filter with modified stub structure

Guo

Heng

et al. 2017

Int J RF Microw Comput Aided Eng

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This paper presents a design method for moderate‐wideband filters with modified λ/2 stub resonators mid‐tapped by λ/4 connecting lines which act as admittance inverters. The modified tapped‐stubs avoid low characteristic impedances of the stubs which results in a very wide strip‐width and a large circuit size. An example filter at 2250 MHz with a fractional bandwidth (FBW) of 45% is successfully designed with this method and fabricated. It has a compact size of 26.5 mm × 10.5 mm on a YBCO/LaAlO3 superconducting wafer. The measurements show good response and match well with the simulations.

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Section: Design Of the Moderate‐wideband Superconducting Filtermentioning

confidence: 99%

“…Modified stub structure has been proposed to realize a bandpass filter in our previous work . In this work, the filter structure and design method are further developed and are presented in detail.…”

Section: Introductionmentioning

confidence: 99%

Design of a moderate-wideband superconducting filter with modified stub structure

Guo

Heng

et al. 2017

Int J RF Microw Comput Aided Eng

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“…In modern wireless communications, there is a great need for dual band opera- There are several approaches reported in the literature to design an integrated dual band Band Pass Filter (BPF) [3] [4] [5] [6]. Cascading band stop filter and wideband BPF is a simple idea to generate dual band BPF [3]. Also, open-shorted coupled lines (OSCL) are used to realize dual band BPF [4].…”

Section: Introductionmentioning

confidence: 99%

Dual Band BPF Based on Parallel Coupled Lines Loaded by Open Stubs for Ku-Band Satellite Applications

Amar¹,

Dardeer²,

Zekry³

2019

JEMAA

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This paper presents a dual band Band Pass Filter (BPF) operating at both the downlink and uplink frequency bands for Ku-band satellite applications. The commonly used frequency band in mobile communications satellites is the Ku-band. These mobile satellite systems help connect remote regions, vehicles, ships, people and aircraft to other parts of the world and/or other mobile or stationary communications units, in addition to serving as navigation systems. The structure of the proposed filter is based on parallel coupled microstrip lines and four sections are used. Tuning the two operational bands can be achieved using two open-circuited stubs at the first and last sections of the parallel coupled microstrip lines. The proposed filter is adjusted to operate at 12.54 GHz and 14.14 GHz for downlink and uplink bands, respectively. The proposed dual band BPF is fabricated, measured, and good agreement is obtained between simulated and measured results.

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“…Another problem of this filter is its small rejection-band between the two passbands. In [10] a compact dual band bandpass filter is designed by combining bandpass and band-stop filters to operate at 2GHz and 2.2GHz. In this structure low insertion losses are obtained in the both passbands.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

Salehi¹,

Abiri²,

Noori³

2014

IJCEE

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In this filter an undesired return loss is seen, where the stopband between two passband is not enough wide. In [4] a dual band band pass filter with very large size and large insertion losses is offered to operate at 1GHz and 2GHz. In [5] the step impedance coupled lines, short circuited and open circuited stubs are used to design a dual band bandpass filter with asymmetric structure which has high insertion losses. In [6] using the step impedance resonators with very large sizes a high losses dual band bandpass filter is designed for ultra wideband applications. In [7] using the open loop resonators and half wave step impedance resonators a large insertion losses dual band bandpass filter is proposed. In [8] a large size step impedance resonator is used to design a dual band bandpass filter with four transmission zeroes. But it has large insertion loss while its large size problem is not solved. In [9] the asymmetric SIRs and open stubs are used to control the transmission zeros of a proposed dual band bandpass filter. Another problem of this filter is its small rejection-band between the two passbands. In [10] a compact dual band bandpass filter is designed by combining bandpass and band-stop filters to operate at 2GHz and 2.2GHz. In this structure low insertion losses are obtained in the both passbands. But the passbands have the small fractional bandwidths. In [11] a double-slot-loaded resonator is used for exploration of a dual band bandpass filter with two closely spaced passbands operated at 2.1GHz and 2.6GHz. In this structure a large insertion loss at second passband is obtained. In [12] a small fractional bandwidth dual band bandpass filter is designed and fabricated using open loop resonators for multimode WLANs. This filter has two undesired return loss in the both passbands.In this paper a compact microstrip filter is designed using two open loop resonators that connected together with mixed coupling. The loops are loaded by simple open stubs. Also in the proposed structure two new tapped lines feed structures are added at the input and output ports to improve impedance matching and achieve dual band bandpass response with good performance in terms of the low insertion losses and the wide fractional bandwidth. This paper is organized as follows: Section II describes design and structure, Section III introduces the simulation results, and Section IV presents the conclusion. II. DESIGN AND STRUCTUREThe open loop resonator loaded by three open end stubs is shown in Fig. 1. A novel step impedance taped line feed structure is connected to the open loop resonator to control the resonance frequencies. This taped line feed structure is added to achieve a good impedance matching too. The proposed resonator is divided to nine paths with different impedances and admittances. International Journal of Computer and Electrical Engineering, Vol. 6, No. 3, June 2014 248 DOI: 10.7763/IJCEE.2014.V6.832The resonance frequencies of the proposed resonator as shown in Fig. 1 can be controlled by adjusting its input im...

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Compact superconducting dual‐band bandpass filter by combining bandpass and bandstop filters

Cited by 22 publications

References 5 publications

Design of a moderate-wideband superconducting filter with modified stub structure

Design of a moderate-wideband superconducting filter with modified stub structure

Dual Band BPF Based on Parallel Coupled Lines Loaded by Open Stubs for Ku-Band Satellite Applications

Design of a Microstrip Dual-Band Bandpass Filter with Compact Size and Tunable Resonance Frequencies for WLAN Applications

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