Wideband Tunable Bandpass Filter Using Optimized Varactor-Loaded SIRs

Qin, Wei; Cai, Jing; Li, Yun-Li; Chen, Jianxin

doi:10.1109/lmwc.2017.2734848

Cited by 50 publications

(30 citation statements)

References 8 publications

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“…The schematic diagram of CSIR branch is drawn in Figure . According to the transmission line theory, the input admittance Y in of the resonator can be expressed as:

Y_{in} = \frac{\cos θ_{1} \cos θ_{2} - Z_{1} \sin θ_{1} \sin θ_{2} / Z_{2}}{{jZ}_{1} \sin θ_{1} \cos θ_{2} + {jZ}_{2} \cos θ_{1} \sin θ_{2}} = \frac{Z_{2} + Z_{1} \tan θ_{1} \tan θ_{2}}{{jZ}_{2} ((), Z_{1} \tan θ_{1} + Z_{2} \tan θ_{2})}

…”

Section: Design Of the Wideband Planar Filtering Dipole Antennamentioning

confidence: 99%

A wideband planar filtering dipole antenna for 5G communication applications

2019

Micro & Optical Tech Letters

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A wideband planar filtering dipole antenna for 5G communication applications is proposed in this article. The proposed dipole antenna is composed of two rectangle radiation patches, fed by the inverted L-shaped feedline. Because of the gradient feedline, a wideband dipole antenna is obtained. Two complementary stepped impedance resonators (CSIRs) branches and two complementary split-ring resonators (CSRRs) are etched on the radiating rectangular patches so that the antenna produces under and upper resonant zeros out of the operating band. The reflection coefficient of the mentioned antenna is <-10 dB in 3.08 to 5.15 GHz (50.3%). In the working frequency band, the radiation pattern of the antenna is very stable. In the desired frequency bands, the antenna gain is >2 dBi. Specially, there are above 23 dB radiation suppression for gain in the out of band. Finally, the filtering dipole antenna is processed and fabricated, and the measured results are consistent with the simulation results. K E Y W O R D S 5G communication, complementary split-ring resonator, complementary stepped impedance resonator, filtering dipole antenna, wideband

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“…The schematic diagram of CSIR branch is drawn in Figure . According to the transmission line theory, the input admittance Y in of the resonator can be expressed as:

Y_{in} = \frac{\cos θ_{1} \cos θ_{2} - Z_{1} \sin θ_{1} \sin θ_{2} / Z_{2}}{{jZ}_{1} \sin θ_{1} \cos θ_{2} + {jZ}_{2} \cos θ_{1} \sin θ_{2}} = \frac{Z_{2} + Z_{1} \tan θ_{1} \tan θ_{2}}{{jZ}_{2} ((), Z_{1} \tan θ_{1} + Z_{2} \tan θ_{2})}

…”

Section: Design Of the Wideband Planar Filtering Dipole Antennamentioning

confidence: 99%

A wideband planar filtering dipole antenna for 5G communication applications

2019

Micro & Optical Tech Letters

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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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“…[4][5][6][7] However, as discussed in Refs. 8 and 9 , most of these filters are enough difficult to be integrated due to their large semiconductor area, that are unsuitable for compact systems. Furthermore, purely passive BPFs have many disadvantages such as the shortcomings of incompatibility with tunable elements, the high level of losses and the deterioration of their electrical characteristics due to technology limitations.…”

Section: Introductionmentioning

confidence: 99%

RF and microwave reconfigurable bandpass filter design using optimized active inductor circuit

Hammadi

Haddad

Saad

et al. 2018

Int J RF Microw Comput Aided Eng

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In this article, a design methodology of an active bandpass filter (BPF) using tunable active inductor (TAI) achieving wide frequency contiguous tuning range (FTR) is presented. The tunable BPF is realized with a differential TAI (DTAI) employing two‐reconfiguration mechanisms one for coarse‐tuning using a controllable current source while the fine‐tuning is performed through a variable feedback resistance. The center frequency tuning is performed through the variation of the DTAI control voltages. A cross‐coupled pair based negative resistance technique is also applied to compensate the resistive losses of equivalent RLC resonator. The filter performances are significantly improved using several optimization techniques such as voltage scaling and multigate finger techniques. The proposed BPF is simulated using 0.13 μm CMOS technology. The filter achieves an insertion loss (IL) of 26.62‐33.45 dB over the tuning range 1.16‐3.27 GHz with a relative bandwidth of 1.3%‐3.4%. The noise figure and input 1‐dB compression point at 1.84 GHz are 14.93 dB and 2.72 dBm, respectively. The designed RF filter consumes an average power of 5 mW at 1 V supply voltage.

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Wideband Tunable Bandpass Filter Using Optimized Varactor-Loaded SIRs

Cited by 50 publications

References 8 publications

A wideband planar filtering dipole antenna for 5G communication applications

A wideband planar filtering dipole antenna for 5G communication applications

A microstrip bandpass filter with 2 independently tunable transmission zeros

RF and microwave reconfigurable bandpass filter design using optimized active inductor circuit

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