A Tunable Bandpass Filter With Modified Parallel-Coupled Line

Tang, Ching‐Wen; Tseng, Chien-Tai; Chang, Shih-Chieh

doi:10.1109/lmwc.2013.2247585

Cited by 24 publications

(32 citation statements)

References 8 publications

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“…The ABCD matrices of the differential mode circuit can be defined as M 1 × M block1 × M block2 × M 1 , and M 1 can be obtained from [35]. In addition, the ABCD matrix M block1 of the modified parallel-coupled line can be obtained from [30]. After the ABCD-and Y-parameter conversions, when S dd21 = 0, the transmission zeros of the differential mode are obtained as follows:…”

Section: Balanced-filter Analysis (N = 0)mentioning

confidence: 99%

“…Figure 1 shows two conventional two-stage open coupled filter circuits with two open/shorted loaded stubs (θ + nπ , n = 0, 1, Z 1 ) connected to the end of the two input/output coupled lines (Z oe , Z oo , θ ). As discussed in [32], the out-of-band suppression and selectivity of the filter can be further improved due to the two shorted loaded stubs (Z 1 ), and the filter circuit of Figure 1(a) can be seen as an improved bandpass filter structure of filter circuits as detailed in [30,33]. The simulated results of Figure 1 are shown in Figure 2.…”

Section: Introductionmentioning

confidence: 98%

“…[28][29][30][31] However, little research has been done to describe the applications of input/output coupled lines with open/shorted loaded stubs in balancedfilter structures -especially for common mode suppression with multiple transmission zeros for balanced-filter structures. In this paper, two balanced-filter circuits based on common coupled lines with open/shorted loaded stubs are proposed.…”

Section: Introductionmentioning

confidence: 99%

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High-selectivity balanced-filter circuits based on coupled lines with open/shorted loaded stubs

Feng

Che

2016

HKIE Transactions

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Section: Balanced-filter Analysis (N = 0)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-selectivity balanced-filter circuits based on coupled lines with open/shorted loaded stubs

Feng

Che

2016

HKIE Transactions

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“…And in order to improve isolation, transmission zeros (TZ) should be introduced between two adjacent passbands. Some previous literatures [6,7] used resonators with self-resonant TZs and have achieved great isolation.…”

Section: Introductionmentioning

confidence: 99%

A tunable dual-band bandpass filter using asymmetrical varactor-loaded HWRs and defected ground structure

Cao

Tang

Wang

et al. 2015

IEICE Electron. Express

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In this paper, a tunable dual-band bandpass filter using asymmetrical varactor-loaded half-wavelength resonators (HWR) and defected ground structure (DGS) is proposed. First, varactors are added at the end of the conventional HWRs to change their resonant frequencies. And to determine the bandwidth of the passbands, the coupling coefficients are calculated to the requirements based on the theoretical analyses. However, the isolation will deteriorate if the passbands are tuned close to each other. Then in order to solve this problem, a pair of circular DGS is introduced at the ground plane of the filter. This structure can prevent electromagnetic energy from propagating at some certain frequency point and if it is designed between the passbands, the isolation will be improved. In our design, the proposed dual-band bandpass filter using varactor-loaded HWRs and DGS is simulated and fabricated. The simulated results and measured results are in good agreement and the proposed filter can be applied in microwave circuits and communication systems.

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“…In general, there are two main methods that are usually adopted to achieve tunable filter: varactor diode [1 ]- [3] and radio-frequency microelectromechanical systems (RF MEMS). Varactor diode filters are widely used due to their low cost, nanosecond tuning speed, and mature products offering.…”

Section: Introductionmentioning

confidence: 99%

A RF-MEMS based dual-band tunable filter with independently controllable passbands

Jia

Liu

2014

2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT)

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This paper proposed a RF-MEMS based dual-band tunable bandpass filter with independently controllable two passbands. The dual-mode resonant is designed to generate independently odd-and even-mode frequency, with RF-MEMS switched network tuning its resonance. Both filter theory and experiment are provided to validate this dual-band tunable filter. The simulation results show that the low passband can be tuned from 2.35 to 2.60GHz, with the 3-dB fractional bandwidth of 10.8%-12.8%, whereas the high passband varies from 3.85 to 4.20GHz with the 3-dB fractional bandwidth of 12.1 %-14.7%.

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A Tunable Bandpass Filter With Modified Parallel-Coupled Line

Cited by 24 publications

References 8 publications

High-selectivity balanced-filter circuits based on coupled lines with open/shorted loaded stubs

High-selectivity balanced-filter circuits based on coupled lines with open/shorted loaded stubs

A tunable dual-band bandpass filter using asymmetrical varactor-loaded HWRs and defected ground structure

A RF-MEMS based dual-band tunable filter with independently controllable passbands

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