An eclectic approach to design tunable amplifiers

Nesimoğlu, Tayfun; Aydın, Çağatay; Atilla, Doğu Çağdaş; Kopru, Ramazan; Yarman, Binboğa Sıddık

doi:10.1002/mmce.20732

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…METU offers an excellent microwave education, research, and measurement infrastructure that covers the full microwave and millimeter-wave range and even goes beyond optical frequen- The realization of a software-defined radio has been a particular objective of the military industry and academia in Turkey. Broadband frequency-tunable PAs and matching networks [28], [29] (see Figure 2) were designed at METU-Northern Cyprus Campus's RF and Telecommunication Laboratory (established by Dr. Tayfun Nesimoglu [30]) using RFT [8]- [18].…”

Section: Microwave System Design (Metu Metu-northern Cyprus Campus mentioning

confidence: 99%

Microwave Engineering Expertise in Turkey [Around the Globe]

Yarman

Palamutcuoglullari

Kaya³

et al. 2018

IEEE Microwave

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Section: Microwave System Design (Metu Metu-northern Cyprus Campus mentioning

confidence: 99%

Microwave Engineering Expertise in Turkey [Around the Globe]

Yarman

Palamutcuoglullari

Kaya³

et al. 2018

IEEE Microwave

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“…These devices can select the differential‐mode (DM) signals in the frequency domain and suppress the common‐mode (CM) noise simultaneously. Moreover, the rapid development of modern wireless and mobile communication systems demands high integration and miniaturization of microwave devices so that the multifunctional components are highly desirable in the current and future communication fields …”

Section: Introductionmentioning

confidence: 99%

A bandwidth‐agile balanced filtering power divider

Tan

et al. 2019

Int J RF Microw Comput Aided Eng

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In this article, a balanced filtering power divider (FPD) that allows for operational agility of the bandwidth (BW) is presented. The differential-mode power dividing and high common-mode (CM) suppression can be realized by microstrip-to-slotline transition. Two slotline open stubs with different lengths are added in shunt to the main slotline for the transition, which can not only introduce transmission poles for extending and controlling transition BW, but also generate two extra transmission zeros (TZs) near to the passband edges, featuring good filtering response. The two transmission poles can be independently tunable by loading varactors to the open ends of slotline stubs and two TZs will be changed accordingly so that the filtering passband BW is electrically tunable. To verify the theoretical prediction, a prototype of tunable balanced FPD is fabricated and measured. The measured results show that the 3-dB fractional bandwidth (FBW) of the passband varies from 5.6% to 12.6%, meaning more than a double tuning range for the FBW, and the CM suppression is better than 40 dB across the frequency band of interest. K E Y W O R D Sbalanced filtering power divider, bandwidth agility, common mode suppression, differential mode

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“…Electronically reconfigurable or tunable microwave circuits are increasingly necessary to control the use of frequency spectrum in modern communication systems. [1][2][3][4][5][6][7][8][9][10][11] Many kinds of tunable or reconfigurable filters have been explored in the RF circuit design art. In among, varactor-tuned bandpass filters (BPFs) are widely developed due to the superiorities of small size, fast tuning speed and low cost.…”

Section: Introductionmentioning

confidence: 99%

“…Electronically reconfigurable or tunable microwave circuits are increasingly necessary to control the use of frequency spectrum in modern communication systems . Many kinds of tunable or reconfigurable filters have been explored in the RF circuit design art.…”

Section: Introductionmentioning

confidence: 99%

Wideband varactor‐tuned balanced bandpass filter with stable passband selectivity

Zhang

Cai

Chen

2018

Int J RF Microw Comput Aided Eng

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This article presents a wideband tunable balanced bandpass filter (BPF) with stable passband selectivity using optimized varactor‐loaded half‐guided wavelength stepped impedance resonator (SIR). By overall investigation, it can be found that the frequency‐tuning range of the varactor‐loaded SIR is not only controlled by the variation range of the loaded capacitor, but it can be widened by optimizing the SIR. The coupling region between the two coupled SIRs in the proposed BPF is studied for achieving the constant absolute bandwidth (ABW) during the frequency‐tuning process. Meanwhile, the frequency‐dependent source‐to‐load coupling is introduced to realize two self‐adaptive transmission zeros (TZs) on both sides of the tunable differential‐mode (DM) passband so that the proposed filter can keep high selectivity. Benefiting from the constant ABW and two self‐adaptive TZs, the stable DM passband selectivity of the balanced tunable filter can be obtained. For demonstration, a balanced tunable BPF based on the optimized varactor‐loaded SIRs is designed, fabricated and measured. The simulated and measured results, showing good agreement, exhibit a tuning range from 0.542 GHz to 0.926 GHz with 3‐dB constant ABW of around 105 MHz and in‐band insertion loss of 1.5‐2.56 dB.

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An eclectic approach to design tunable amplifiers

Cited by 5 publications

References 6 publications

Microwave Engineering Expertise in Turkey [Around the Globe]

Microwave Engineering Expertise in Turkey [Around the Globe]

A bandwidth‐agile balanced filtering power divider

Wideband varactor‐tuned balanced bandpass filter with stable passband selectivity

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