Dual-band tunable bandpass filter with independently controllable centre frequencies

Cui, Hengrong; Sun, Yun; Wang, Wei; Lu, Yun

doi:10.1080/21681724.2015.1036796

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…Controlling the transmission zero position is very important to researchers in preventing interference with adjacent frequency bands.Various techniques have been used to make bandpass filter suit modern communication characteristics [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. A fixed frequency open ended tapped stub with good selectivity is shown in [1] and [2].Bandpass filters using a tuned tapped stub with a varactor to yield reconfigurable transmission zeros and tunable frequency range is presented in [3,4].…”

Section: Introductionmentioning

confidence: 99%

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A Compact Bandpass Filter Using A T-Shaped Loaded Open-ended Stub Resonator

Obadiah¹,

Hamid²,

Rahim³

et al. 2018

IJEECS

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This paper proposes a compact bandpass filter using a loaded open-ended T-shaped stub. The open-ended T-shaped stub is loaded with vertical resonators placed across. The key advantage of using vertical resonators in the design is the simplicity and low insertion loss it provides. The structure used is an open-ended stub attached on one end to the transmission line (λ/2) to form a T-shaped resonator (λ/4) having vertical resonators placed across. The vertical resonator position alters the position at which the transmission zero occurs. A pair of the T-shaped resonator is placed on parallel sides of the feed line. The proposed filter is designed with the aid of Computer Simulation Technology Microwave Studio Software. The proposed concept is verified by designing filters with four different vertical resonator positions. The filter possesses a good rejection and low insertion loss of < 2dB with Chebyshev response. This filter is suited for modern-day communication applications since it shows good rejection of out of band signals.

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Section: Introductionmentioning

confidence: 99%

“…Centrally loaded resonators are used to propose tunable passbands [7] for dual bands. Controllable passband frequencies and bandwidths by using a multi-stub loaded resonator with compact size is demonstrated [8] [9,10]. A varactor tuned open ring resonator is used in [15] to design a tunable bandpass filter with absolute bandwidth.…”

Section: Introductionmentioning

confidence: 99%