Wideband impedance transformer with out‐of‐band suppression characteristics

Kim, Phirun; Chaudhary, Girdhari; Jeong, Yongchae

doi:10.1002/mop.28664

Cited by 15 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [3], an open-circuited coupled line IT with was presented. Similarly, the coupled line IT with a shunt TL for was investigated and provided good out-of-band suppression [4]. An unequal terminated coupled line bandpass filter with was presented in [5] using optimization technique.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultra-High Transforming Ratio Coupled Line Impedance Transformer With Bandpass Response

Kim

Chaudhary

Jeong

2015

IEEE Microw. Wireless Compon. Lett.

Self Cite

View full text Add to dashboard Cite

An impedance transformer (IT) with a ultra-high impedance transforming ratio (UHITR) is presented in this letter. The UHITR is obtained by controlling coupling coefficients of cascaded open-circuited coupled lines. Two transmission poles have appeared in the passband for an under-matched region. For the validation, the IT with impedance transforming ratio of 10 was designed at a center frequency of 2.6 GHz. From the experiment, insertion and return losses at were determined as 0.55 dB and 21.47 dB, respectively. Within the operating band from 2.515 to 2.73 GHz, the insertion and return losses were better than 0.8 dB and 18 dB, respectively. The out-of-band suppression characteristics are higher than 20 dB from dc to 1.92 GHz and better than 18 dB from 3.28 to 7.2 GHz.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The of both coupled lines is assumed to be the same for convenience and simplicity in the analysis. The -parameters of the proposed circuit can be found as (1) from the overall ABCD-parameters of cascaded coupled lines [4]- [6] (1a)…”

Section: Introductionmentioning

confidence: 99%

Ultra-High Transforming Ratio Coupled Line Impedance Transformer With Bandpass Response

Kim

Chaudhary

Jeong

2015

IEEE Microw. Wireless Compon. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…But the rejection at stopband is poor. To enhance the selectivity, a parallel coupled line with an open shunt stub is introduced . The wider return loss bandwidth is achieved by keeping the parallel coupled line in over‐matched condition.…”

Section: Introductionmentioning

confidence: 99%

A filtering impedance transformer with high transforming ratio

Chen

et al. 2018

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A filtering impedance transformer with high transforming ratio and good suppression out of band is presented in this article. Design parameters of the proposed configuration are analyzed. For verification, a 50 to 500 Ω transformer operating at 3 GHz has been designed, fabricated, and measured. The measured maximum insertion is about 0.87 dB and the measured return loss is better than 18 dB from 2.71 to 3.29 GHz, which are in good agreements with the simulated ones.

show abstract

“…Therefore, it is frequently used in many applications such as power combining/splitting, baluns, couplers, antennas and amplifiers. Many researchers focused on the development of ITs with ultra-high transforming ratio (UHTR) for wideband [1][2][3][4][5][6][7][8][9][10][11] and multi-frequency operations [12][13][14][15][16][17][18][19][20][21][22][23]. Various techniques such as a transmission line and coupled-line section [1], a parallel coupled-line and shunt open-stub [2], multi-section quarter-wavelength line [3] and two-section transmission lines [4] have been employed to develop wideband ITs.…”

Section: Introductionmentioning

confidence: 99%