Bandwidth‐tunable filtering balun based on compact 3D configuration

Yao, Lidan; Wu, Yongle; Li, Mingxing; Wang, Weimin; Liu, Yuanan

doi:10.1049/el.2018.7145

Cited by 2 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 5 summarizes the comparisons between the proposed balun and other frequency tunable balun that can be found in the literature. Perfect port impedance match at each center frequency cannot be achieved in References [21][22][23], while this feature can be achieved by the proposed balun. It is exhibited from Table 5 that the performances of the proposed balun exceed the performances of the former ones [21][22][23] in terms of the return loss, insertion loss, amplitude imbalance, phase Table 5 summarizes the comparisons between the proposed balun and other frequency tunable balun that can be found in the literature.…”

Section: Measurement Resultsmentioning

confidence: 94%

“…Besides, an ideal output matching and isolation should be maintained for the frequency-tuned baluns in the entire tuning range. However, no IsC are provided in References [21][22][23][24]. In this paper, a frequency tunable planar balun with wide frequency tuning range is proposed.…”

Section: Design Equations For the Balunmentioning

confidence: 99%

“…With the development of wireless communication technology, the demands for reconfigurable components which could cover multiple bands are increasing. Thus, various frequency tunable front-end circuits have been developed, such as power dividers [17,18], couplers [19,20], and baluns [21][22][23][24]. In Reference [21], a compact frequency tunable microstrip balun with a ring structure is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…But the RL is deteriorated along with the frequency increases. Later, a bandwidth tunable filtering balun based on compact 3D configuration is presented [23]. It has a 34.3% frequency tuning range, and a wide bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…However, high losses and poor PD are also exhibited. Moreover, since perfect port impedance match cannot be achieved by the reported structures [21][22][23] in each tuning center frequency, a narrow frequency tuning range is inevitable. In Reference [24], a differential coupling structure for tunable evanescent mode cavity resonators with a 62.4% frequency tuning range is reported.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Tunable Planar Balun with an Isolation Circuit Using Varactors Loaded Coupled Lines

et al. 2020

View full text Add to dashboard Cite

In this paper, a frequency tunable planar balun composed of varactors loaded coupled lines (VL-CLs) is presented. By tuning the capacitances of the varactors, a wide frequency tuning range is obtained. Moreover, good impedance match, balanced output ports amplitude, and consistent output ports phase difference (PD) are maintained during the tuning. A detailed theoretical analysis using the signal flow diagram and the even-odd mode method is presented to clarify the characteristics of the proposed balun. To achieve ideal output matching and isolation for the proposed balun, a novel frequency tuned isolation circuit (IsC) is designed and connected to the balun. In theory, a frequency tuning range of 200% can be realized. In practice, due to the limited capacitances of the varactors, a prototype with a tunable frequency of 1.0 GHz~2.0 GHz (66.7%) is designed, fabricated, and measured. The measured results show that more than21 dB of return loss (RL), 180 • ± 1.8 • of phase difference, 0.43 dB of amplitude imbalance (AP), and 22 dB of isolation are obtained at all tuning center frequencies, agreeing well with the simulated results.

show abstract

Section: Measurement Resultsmentioning

confidence: 94%

Section: Design Equations For the Balunmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Tunable Planar Balun with an Isolation Circuit Using Varactors Loaded Coupled Lines

et al. 2020

View full text Add to dashboard Cite

show abstract

Design of Novel Reconfigurable Filter With Simultaneously Tunable and Switchable Passband

2019

View full text Add to dashboard Cite

This paper presents a new loading scheme for adding the varactor and PIN diodes into a quarterwavelength (λ/4) resonator. Based on this, a novel reconfigurable filter with simultaneously tunable and switchable passband is introduced. Constant absolute bandwidth (ABW) and two transmission zeroes (TZs) can be obtained to enhance the passband performance in the ON-state. As the passband is turned to the OFF-state, high isolation can be realized at the frequency of interest. Meanwhile, the varactors, which are used to control the external quality factor (Q e) in the ON-state, can be tuned to improve the in-band isolation in the OFF-state. For demonstration, a reconfigurable filter with tunable and switchable passband is fabricated and measured. The measured results show a high selectivity tunable passband with the tuning range of 32.4% and 3-dB ABW of 51 ± 2 MHz in the ON-state. The isolation >40dB can be achieved in the OFF-state. Good agreement of the simulated and measured results is presented to verify the theoretical predictions.

show abstract

Bandwidth‐tunable filtering balun based on compact 3D configuration

Cited by 2 publications

References 6 publications

A Tunable Planar Balun with an Isolation Circuit Using Varactors Loaded Coupled Lines

A Tunable Planar Balun with an Isolation Circuit Using Varactors Loaded Coupled Lines

Design of Novel Reconfigurable Filter With Simultaneously Tunable and Switchable Passband

Contact Info

Product

Resources

About