A Tunable Bandpass-to-Bandstop Reconfigurable Filter With Independent Bandwidths and Tunable Response Shape

Naglich, Eric J.; Lee, Juseop; Peroulis, Dimitrios; Chappell, William J.

doi:10.1109/tmtt.2010.2086533

Cited by 85 publications

(39 citation statements)

References 16 publications

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“…Subsequent designs were based on a substrate integrated technique. The resonators have been studied in multiple designs including tunable bandwidth filters [9], triplexer [11], reconfigurable order filters [12] and band pass to band stop switchable filters [13]. Tuning elements for the evanescent mode cavities based on micro-electro-mechanical system (MEMS) technology using both electrostatic [14] and magneto static actuation [15] have also been demonstrated.…”

Section: Tunable Cavity Filtersmentioning

confidence: 99%

Review on RF Tunable Filters

2017

IJIET

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-Multi-band radios are necessary nowadays to provide optimal data rates in a network with a varied and greasy landscape of coverage areas (3G, HSPA, LTE, etc.). As required the number of bands are increased, the total cost of discrete RF filters justifies the use of tunable RF filters. Tunable filters are one of the key to signal chain amalgamation. The main requirements for a tunable filter are high unloaded quality factor, wide tuning range, high tuning speed, high linearity, and small size. Tunable filters play a vital role in many RF receiver applications. These filters are used to separate or combine different frequencies bands because the electromagnetic spectrum is limited and has to be shared. Tunable RF filters are used to select or confine the RF signals within assigned spectral limits. Thanks to the numerous technology and the recent developments in design and implementations of the tunable RF filters, usage of these filters has increased exponentially. Emerging applications such as wireless communications continue to challenge RF/microwave filters with ever more stringent requirements higher performance, smaller size, lighter weight, and lower cost. Depending on the requirements and specifications, RF filters may be designed as lumped element or distributed element circuits. They may be realized in various transmission line structures, such as waveguide, coaxial line, and micro strip. Compared to the other types of filter, a tunable filter has its own place. There are many challenging research problems existing with tunable filters. Beginning with an overview of the tunable filters literature, this paper compares and discuss about the various tunable solutions and their issues with different types of tuning. High performance filters necessitate high resonator quality factors. Although filters are traditionally treated as passive devices, tunable filters need to be treated as active devices. Tuning elements invariably introduce non-linearities that limit the useful power handling of the tunable filter.

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Section: Tunable Cavity Filtersmentioning

confidence: 99%

Review on RF Tunable Filters

2017

IJIET

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“…As the demand on communications systems that use multiple operating frequencies increases, design of frequency-tunable RF/microwave filters and multi-band filters has been of a great interest in the field of microwave engineering [1,2,3,4,5,6,7,8,9,10,11,12,13,14]. Particularly, study on frequency-tunable filters has been mainly motivated by increased necessity of frequency agility in next-generation communications systems and electronic-warfare systems.…”

Section: Introductionmentioning

confidence: 99%

“…Tunable SIW cavity resonator filters have shown large frequency tuning ranges and high-Q performances [7,8,9,10,11,12,13]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that solder paste is used between the membrane and the via-holes on the outer boundary for electrical connection between them. On the other hand, the conventional filter structure [7,8,9,10,11,12] has copper-plated via-holes running from the TMM3 substrate to the membrane. This via-hole structure increases fabrication complexity, and the details will be discussed later.…”

Section: Introductionmentioning

confidence: 99%

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Low-cost high-performance frequency-tunable substrate-integrated waveguide filter structure and fabrication method

Nam¹,

Koh²,

Lee³

et al. 2016

IEICE Electron. Express

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This paper presents a new frequency-tunable substrate-integrated waveguide (SIW) filter structure and its fabrication method. The center frequency of the filter is adjusted by moving the membrane structure in each resonator, and the presented fabrication method mainly focuses on how to minimize the number of fabrication steps for constructing the flexible membrane. Due to the simplified process, the filter has advantages of low cost and low risk fabrication. The comparison between a conventional fabrication procedure and the new proposed method is described. For verifying the presented filter structure and fabrication method, two frequency-tunable SIW bandpass filters of the presented structure have been implemented using the presented fabrication method. It is shown that the measured response agrees well with the simulated one. The minimum insertion loss is 0.85 dB, demonstrating that high quality factor can be achieved. Keywords: substrate integrated waveguide (SIW), filter, high Q, copper membrane Classification: Microwave and millimeter-wave devices, circuits, and modules References[1] R. Gomez-Garcia and X. Gong: IEEE Microw. Mag. 15 (2014) 28.

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“…Hence, studies have also been expanded to explore multifunction filter. In [5,6], it is shown that reconfigurable filters can have two functionalities by utilizing a number of switches, but having multiple switches in filter structures is one of drawbacks sacrificing insertion loss performance.…”

Section: Introductionmentioning

confidence: 99%

Frequency-tunable bandstop-bandpass dual-function microwave filter

Lee¹,

Lee²,

Park

et al. 2015

IEICE Electron. Express

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This letter presents a frequency-tunable, dual-function, microwave filter with both bandpass and bandstop functionalities. The filter uses a single switch to change the functionality minimizing the insertion loss, and it can replace a traditional filter bank structure that contains two filters and two switches. Frequency-tunable substrate-integrated waveguide (SIW) resonators are adopted in this filter design. Measured results show that both bandpass and bandstop responses can be tuned from 3.0 GHz to 3.6 GHz. The measured minimum insertion loss at the center frequency is 1.1 dB for the bandpass mode and the attenuation at the center frequency is greater than 40 dB over the entire frequency tuning range.

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A Tunable Bandpass-to-Bandstop Reconfigurable Filter With Independent Bandwidths and Tunable Response Shape

Cited by 85 publications

References 16 publications

Review on RF Tunable Filters

Review on RF Tunable Filters

Low-cost high-performance frequency-tunable substrate-integrated waveguide filter structure and fabrication method

Frequency-tunable bandstop-bandpass dual-function microwave filter

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