Compact MEMS-Based Ultrawide-Band CPW Band-Pass Filters With Single/Double Tunable Notch-Bands

Nosrati, Mehdi; Vahabisani, Nahid; Daneshmand, Mojgan

doi:10.1109/tcpmt.2014.2331211

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…In other words, the capacitance tuning allows a shift of the characteristics-frequencies to the low-or highfrequency domain depending on the used capacitance value. Using this technique, another method can be developed to obtain a flexible tunable filter [26,27], which consists of a combination of passive microstrip components and active varactor-capacitor. Fig.…”

Section: Design Of New Tunable Band-stop Filter Using Symmetrical L-smentioning

confidence: 99%

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Design of Compact Reconfigurable Broadband Band-Stop Filter Based on a Low-Pass Filter Using Half Circle DGS Resonator and Multi-Layer Technique

Boutejdar¹

2017

PIER C

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Abstract-This paper describes the design of a two-pole low-pass and band-stop filters. The low-pass structure is designed at the cutoff frequency of 2 GHz for the L-Band applications. This architecture uses half circle defected ground structure HCDGS instead full circle DGS resonator. Both the HCDGS shapes are etched in the ground plane and coupled via a substrate with a compensated capacitor. The rejection bandwidth of the LPF covers a large wideband spectrum. Therefore, the band suppression reaches more than 3f c. The filter is simulated and fabricated. The measured results are in good agreement with the full-wave simulated ones, showing the merits of compact size and sharp roll-off. The multi-layer technique has been used in order to realize a transformation from low-pass behaviours to band-stop characteristics, keeping the same passband features. The new extracted band-stop topology is simulated and optimized using an RO4003 substrate with relative permittivity of 3.38 and thickness of h = 0.813 mm. The structure has a wide stopband with over 20 dB rejection from 3.5 GHz to 8.5 GHz. Such filters can be used for L-band and military applications.

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Section: Design Of New Tunable Band-stop Filter Using Symmetrical L-smentioning

confidence: 99%

“…To improve the sharpness and thus stopband bandwidth, two symmetrical L-stepped impedance resonators are added at both sides of the octagonal patch capacitor. To show the tunability of this band-stop structure [26,27], several variations of the microstrip capacitor-length are used. …”

Section: Introductionmentioning

confidence: 99%

Design of Compact Reconfigurable Broadband Band-Stop Filter Based on a Low-Pass Filter Using Half Circle DGS Resonator and Multi-Layer Technique

Boutejdar¹

2017

PIER C

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“…Since the Federal Communication Commission (FCC) officially assigned an unlicensed use of ultrawideband (UWB) communication spectrum from 3.1 to 10.7 GHz in 2002, various UWB filters have been reported [9][10][11][12][13][14][15][16][17][18][19][20][21]. Due to the existing undesired narrow band radio signals such as WLAN that may interfere with the FCC UWB range, UWB filters with a notched band are desired.…”

Section: Introductionmentioning

confidence: 99%

“…The notched bands have been realized through various techniques, such as an embedded parasitic coupled line [12], an embedded λ/4 slotline [13,14], a simplified composite right-/left-handed resonator [15], and asymmetric parallel-coupled lines [16,17]. As the existing undesired parasitic signals in the FCC UWB range change from place to place and from time to time, UWB filters with tunable notched band have been studied [18][19][20][21]. In [18,19], UWB filters with tunable notch have been developed with advanced technology such as silicon-based integrated passive device (IPD) and microelectromechanical system (MEMS), which require high cost and hybrid technology.…”

Section: Introductionmentioning

confidence: 99%

“…As the existing undesired parasitic signals in the FCC UWB range change from place to place and from time to time, UWB filters with tunable notched band have been studied [18][19][20][21]. In [18,19], UWB filters with tunable notch have been developed with advanced technology such as silicon-based integrated passive device (IPD) and microelectromechanical system (MEMS), which require high cost and hybrid technology. Tunable notched UWB bandpass filters (BPFs) have been reported based on microstrip line in PCB technology in [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Compact UWB BPF with a Tunable Notched Band based on Triplemode HMSIW Resonator

Zhou¹,

Guo²,

Wu³

2016

IJWMT

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A novel triple-mode resonator based on the half-mode substrate integrated waveguide (HMSIW) structure is proposed to design the ultra-wideband (UWB) filters. The UWB filter topology is given by analyzing the resonant frequencies of the three modes and the signs of the coupling between the three modes and the input/output ports. With the filter synthesis method, a triple-mode UWB filter with passband from 3.1-10.6 GHz is effectively realized with two transmission zeros at the upper stopband. To block the existing undesired narrowband radio signals in FCC UWB range, a notched band can be easily generated and controlled by a loaded stub-capacitor. For demonstration, an UWB filter with a tunable notched band from 3.7 to 7.7 GHz and compact size is designed and fabricated. Both simulated and measured results indicate that the proposed new filter has the properties of wide tuning range of the notched band and sharp roll off.Index Terms: Filter; Half-mode substrate integrated waveguide (HMSIW); Tunable notch; Ultra-wideband (UWB).

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