Performance Analysis of Reconfigurable Bandpass Filters With Continuously Tunable Center Frequency and Bandwidth

Schuster, Christian; Wiens, Alex; Schmidt, Florian; Nickel, Matthias; Schubler, Martin; Jakoby, Rolf; Maune, Holger

doi:10.1109/tmtt.2017.2742479

Cited by 53 publications

(24 citation statements)

References 41 publications

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“…However, this equation does not include harmonic distortion, because the harmonic distortion is far away from the input signal in the frequency domain so that an RF filter is used to suppress harmonic distortion in the past narrowband communication. As can be seen, the wideband transmitters supporting multi-communication-channels at different frequency bands have attracted extensive interest because of low cost and small volume [5,6,17]. In [17], an ultra-wideband efficient linearized power amplifier proposed supports 0.4 to 4.2 GHz bandwidth, whose communication frequency range is of different orders.…”

Section: Distortions and Nonlinearity Of The Transmitter Systemmentioning

confidence: 99%

Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

Peng¹,

Qiu²,

Mu³

2018

PIER M

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Abstract-High power amplifier not only causes in-band intermodulation but also causes out-of-band harmonic distortion. For a wideband transmitter, harmonic distortion out of communication frequency can be restrained by a radio-frequency filter, but harmonic distortion in the communication frequency is difficult restrain. In this paper, we develop harmonic memory polynomial to model harmonic distortion and then propose a digital harmonic canceling algorithm based on direct learning structure -nonlinear filtered-x affine projection algorithm (NFX-APA). Simulation and measurement results demonstrate that this novel digital canceling method can cancel harmonic effectively.

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Section: Distortions and Nonlinearity Of The Transmitter Systemmentioning

confidence: 99%

Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

Peng¹,

Qiu²,

Mu³

2018

PIER M

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“…Tunable filters have attracted many attentions for reconfigurable system in recently years . Except the center frequency, bandwidth tunable, and both center frequency and bandwidth tunable filters, the transmission zero (TZ)‐tunable filter was studied as well . The TZ‐tunable filter can adaptively notch the stopband interferers or vary the skirt selectivity, which is helpful for the communication or radar system to adapt to the time‐varying RF signal .…”

Section: Introductionmentioning

confidence: 99%

A microstrip bandpass filter with 2 independently tunable transmission zeros

Cheng

2020

Micro & Optical Tech Letters

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This letter presents a new design method for a tunable bandpass filter with independently and widely tunable transmission zeros (TZs). Varactor‐loaded microstrip resonators are introduced to a fixed bandpass filter to realize the continuously tunable TZs. Although the tunable resonators have unloaded Q lower than 100, the insertion loss of the filter is not increased. The coupling matrix with the lossy resonators is synthesized and used to analyze the characteristic of the TZ‐tunable filter. A bandpass filter centered at 2 GHz with a 3‐dB bandwidth of 230 MHz is designed to validate the design concept. The measured results show good agreement with the simulated results. The fabricated filter has 2 TZs ranging from 1.4 to 1.8 GHz and from 2.28 to 3.08 GHz, respectively. The TZ‐tunable filter exhibits insertion losses ranging from 1.62 dB to 1.93 dB at the center frequency. The center frequency and bandwidth keep nearly unchanged when the TZs are tuned.

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“…According to the types of tuning elements used, these tunable filters can be classified as varactor‐tuned microwave filters, radio frequency microelectromechanical system (RF MEMS) tunable microwave filters, ferroelectric film tunable microwave filters, and piezoelectric transducer (PET) tunable microwave filters . Varactor‐tuned microwave filters attract very active research; however, the variation of the insertion loss of the filters in the tuning range is larger and the third‐order intercept point is lower, which limits their applications in high power signal systems . RF MEMS tunable microwave filters have the advantages of low insertion loss and high linearity, but a RF MEMS tends to be very sensitive to environmental conditions such as air moisture, temperature, and vibrations, and is expensive due to its complicated technology .…”

Section: Introductionmentioning

confidence: 99%

“…Ferroelectric film tunable microwave filters are based on the fact that the permittivity of the ferroelectric film can change proportionally with the magnitude of an applied DC electric field . They have good linearity and a near zero power consumption . But there is a contradiction between tunability and Q value at microwave frequencies, which leads to a high insertion loss in a wide tuning range.…”

Section: Introductionmentioning

confidence: 99%

Effects of dielectric substrates on piezoelectric transducer tunable filter

Cao

Yan

Yin

2019

Micro & Optical Tech Letters

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This article represents the effects of dielectric substrates on the performances of piezoelectric transducer (PET) tunable bandpass filters. The filter consists of two open loop resonators that are coupled by a magnetic coupling. A capacitive cross coupling between input and output port is introduced, which produces two transmission zeros in the lower and upper stopbands. Three dielectric substrates with various dielectric constants are used as perturbers, and their effects on the coupling coefficient and quality factor of the microstrip filter are analyzed. A PET tunable filter with each substrate as a perturber is fabricated and measured.

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Performance Analysis of Reconfigurable Bandpass Filters With Continuously Tunable Center Frequency and Bandwidth

Cited by 53 publications

References 41 publications

Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

Digital Harmonic Canceling Algorithm for Power Amplifiers Based on Nonlinear Adaptive Filter

A microstrip bandpass filter with 2 independently tunable transmission zeros

Effects of dielectric substrates on piezoelectric transducer tunable filter

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