A 2.45/5.2 GHz Image Rejection Mixer With New Dual-Band Active Notch Filter

Liang, Ching-Piao; Rao, Pei-Zong; Huang, Tien-Jien; Chung, Shyh‐Jong

doi:10.1109/lmwc.2009.2032013

Cited by 13 publications

(3 citation statements)

References 8 publications

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“…Tunable band-stop resonators are the building block to produce tunable band-stop filters that can play an important role in wireless communication receivers. They can be used in adaptable image rejection receivers, or to tune out interfering signals at the RF stage of a receiving communications system [1][2][3]. The proposed device can also be used to attenuate signals passing through the main transmission line with frequency and bandwidth reconfiguration.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed tunable RF MEMS resonator is designed for continuous fine tuning. Conventional RF MEMS-based tunable bandstop filters have been implemented using MEMS cantilever switches to select different filter states [1,4,5] or MEMS bridges as loading capacitors over coplanar transmission lines [6]. When MEMS cantilevers or bridges are used for continuously tuned devices, they can be used up to 1/3 of the distance between the membrane and transmission line.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we propose a new concept for continuous frequency and bandwidth fine tuning using the movable resonator, which is able to produce different tuning effects depending on the overlapping region between the main line and the suspended resonator using a robust structure. Contrary to the conventional decoupling methods using cantilevers [1], the proposed methods conceptually enable us to obtain higher capacitance changes due to the large displacement of the resonator, which results in frequency and bandwidth alteration. When using conventional cantilevers or bridges, it is not possible to obtain an off-state capacitance of 0 F, while using the device proposed in this paper, a virtual initial null capacitance state can be obtained by placing the resonator apart from the transmission line.…”

Section: Introductionmentioning

confidence: 99%

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RF MEMS suspended band-stop resonator and filter for frequency and bandwidth continuous fine tuning

Jang

Llamas-Garro

Kim

et al. 2011

J. Micromech. Microeng.

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We firstly propose the concept of a frequency and bandwidth fine-tuning method using an RF MEMS-based suspended tunable band-stop resonator. We experimentally show the feasibility of the continuously tuned resonator, including a second-order filter, which consists of cascaded resonators to achieve center frequency and bandwidth fine tuning. The structure consists of a freestanding half-wavelength (λ/2) resonator connected to a large displacement comb actuator. The lateral movement of the λ/2 resonator over the main transmission line produces different electromagnetic decoupling values from the main transmission line. The decoupled energy leads to continuous center frequency and bandwidth tuning using the band-stop resonator circuit for fine-tuning applications. The freestanding λ/2 resonator plays the role of a variable capacitor as well as a decoupling resonator in the proposed structure. The fabricated tunable filter shows suitability for Ku-band wireless communication system applications with continuous reconfiguration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

RF MEMS suspended band-stop resonator and filter for frequency and bandwidth continuous fine tuning

Jang

Llamas-Garro

Kim

et al. 2011

J. Micromech. Microeng.

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Recent advancement in the design of mixers for software‐defined radios

Mehta

Donelli

2021

Int J RF Mic Comp-Aid Eng

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The implementation of software-defined radio necessitates a versatile radio frequency (RF) front-end that can support multiple standards in different frequency bands. This article presents the state-of-the-art multiband and wideband mixers in the context of different receiver architectures suitable for softwaredefined radio (SDR). Wideband and multiband mixer designs reported in the literature are categorized on the basis of their circuit architecture. This study tabulates the results of mixer designs with an emphasis on noise figure (NF), conversion gain (CG), linearity, and image rejection ratio. The best parameters reported in the comparison are 68-84 dB of CG, 3.2 dB of NF, 2.5 mW of power consumption, 12.5 dBm of third-order input intercept point, and 0.015 mm 2 of area at different frequencies. The study also discusses the design challenges and techniques to overcome those issues. The article concludes with the summary and prospective developments for SDR architectures.

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