Compact Microstrip Filtering Power Dividers With Good In-Band Isolation Performance

Chen, Chi-Feng; Lin, Cheng‐Yu

doi:10.1109/lmwc.2013.2287243

Cited by 87 publications

(63 citation statements)

References 8 publications

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“…Resistors were commonly used to improve matching at the output ports and therefore achieve good isolation but usually over a narrow frequency range [8]. Together with carefully placed resistors, coupling structures and stepped-impedance resonators (SIRs) have been reported to provide improved isolation over a wider bandwidth [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Compact Coupling Structure for Diplexers and Filtering Power Dividers

Wang

2018

PIER M

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Abstract-This paper presents a compact and novel coupling structure for diplexers and power dividers based exclusively on coupled resonators. It consists of two cross-coupled structures joined together by two common resonators with a cluster of only four resonators. For a diplexer, it represents one of the most compact topologies that produces two 2nd-order channel filters with two fully controllable transmission zeros. This can be used to increase the rejection and isolations between channels without increasing the number of resonators. The same topology can also be used to realise a 3rd-order filtering power divider (FPD), with its embedded cascade trisection (CT) structure generating an asymmetric transmission zero. The coupling matrices of several diplexers and power dividers have been synthesized. Two microstrip diplexers with different positions of the transmission zeros have been demonstrated to verify the device concept. A 1.8 GHz FPD with a fractional bandwidth of 5% has also been prototyped, showing an improved out-of-band rejection from 15 dB to 25 dB below 1.71 GHz. The isolation performance of the divider has been investigated and improved from 7 dB to 18 dB across the band by adding only one resistor.

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Section: Introductionmentioning

confidence: 99%

A Compact Coupling Structure for Diplexers and Filtering Power Dividers

Wang

2018

PIER M

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“…Extensive studies featuring a variety of advantages were conducted, such as the abilities to perform balanced-to-unbalanced operation [1], to achieve compactness and high isolation [2], and to realize arbitrary power ratios [3]. However, most of the FPDs in the literature, including the aforementioned FPDs, were designed at fixed frequencies.…”

Section: Introductionmentioning

confidence: 99%

A 1.3–2.08 GHz Filtering Power Divider With Bandwidth Control and High In-Band Isolation

Chi

Yang

2016

IEEE Microw. Wireless Compon. Lett.

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This letter proposes a varactor-based filtering power divider that allows for reconfigurable operating frequency and bandwidth with high in-band isolation. A simple but effective tuning scheme was used to attain good impedance matching and isolation for all tunable states. Experimental results show that, for input return loss > 16.6 dB, the center frequency and 1 dB constant absolute bandwidth can be tuned from 1.3 to 2.08 GHz and from 70 to 130 MHz, respectively. Moreover, this work demonstrates > 26 dB output isolation, < ±0.23 dB magnitude imbalance, and < ±1.3 • phase imbalance. Measured and simulated results are in good agreement.Index Terms-Bandwidth control, filtering power divider, frequency-agile, in-band isolation, reconfigurable.

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“…In [16], a capacitive loaded dual-mode resonator was used to design a bandpass filter with wide stopband. In recently, dual-mode resonators are also widely used to design microwave components, like dual-band or multi-band filters [19,20], diplexers [21,22], power dividers [23][24][25][26][27][28][29], etc. due to their high-performance.…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Mode Bandpass Filter with Wide Stopband Using Capacitance Loaded Square Meander Loop Resonator

Duan

Song

Fan

et al. 2016

Wireless Pers Commun

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A novel dual-mode bandpass filter with wide stopband using capacitance loaded square meander loop resonator is presented. The resonator can exhibit dispersion effect due to loaded capacitance, which can reduce the size of resonator and suppress harmonic. The disturbed degenerate-mode resonances are used to form the passband while two transmission zeroes are generated on each side of the passband so as to obtain high selectivity. The circuit area of bandpass filter is only 0.14kg 9 0.14kg, where kg is the guided wavelength at the center frequency. The measured result reaches good agreement with simulated result.

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Compact Microstrip Filtering Power Dividers With Good In-Band Isolation Performance

Cited by 87 publications

References 8 publications

A Compact Coupling Structure for Diplexers and Filtering Power Dividers

A Compact Coupling Structure for Diplexers and Filtering Power Dividers

A 1.3–2.08 GHz Filtering Power Divider With Bandwidth Control and High In-Band Isolation

Compact Dual-Mode Bandpass Filter with Wide Stopband Using Capacitance Loaded Square Meander Loop Resonator

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