Compact microstrip lowpass filter with ultrasharp response using a square-loaded modified T-shaped resonator

Pirasteh, Ali; Roshani, Saeed; Roshani, Sobhan

doi:10.3906/elk-1801-127

Cited by 32 publications

(17 citation statements)

References 26 publications

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“…The novel formulas are presented for the first time. The formulas needed for calculating LC equivalent of a rectangular resonator are written in (1) and (2). The rectangular resonator can be equaled by two capacitors and an inductor [1].…”

Section: Main Resonatormentioning

confidence: 99%

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Design of a low pass filter using rhombus-shaped resonators with an analyticalLC equivalent circuit

Hookari¹,

Roshani²,

Roshani³

2020

Turk J Elec Eng & Comp Sci

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In this paper, a new method is presented for the design of a low pass filter (LPF) based on an LC equivalent circuit. Firstly, new formulas are proposed to calculate an LC equivalent circuit of a rhombus-shaped resonator. Secondly, the transfer function and transmission zero of the rhombus-shaped resonator are extracted, based on the presented formulas. Then other rhombus-shaped resonators are designed, based on the extracted formulas. The proposed filter has a cutoff frequency with an attenuation level of 3 dB at 1.54 GHz. The obtained return loss and insertion loss in the pass band are 16 dB and 0.1 dB, respectively. The designed filter is fabricated on RT-5880 with 31 mil thickness.

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Section: Main Resonatormentioning

confidence: 99%

“…Trigonometric functions can be used to calculate the LC equivalent circuit of the rhombus-shaped resonator. In the rectangular resonator, the length and width of transmission lines are important to calculate the LC equivalent circuit based on equations (1) and (2). The structure of the rhombus-shaped resonator is shown in Figure 1.…”

Section: Main Resonatormentioning

confidence: 99%

Design of a low pass filter using rhombus-shaped resonators with an analyticalLC equivalent circuit

Hookari¹,

Roshani²,

Roshani³

2020

Turk J Elec Eng & Comp Sci

Self Cite

View full text Add to dashboard Cite

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“…To realize a tunable dual-band BPF in [55], a loop structure coupled with bended stubs was loaded by square and T-shaped stubs. It could also be used in LPFs for extending the stopband [56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

et al. 2020

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A narrowband dual-band bandpass filter (BPF) with independently tunable passbands is presented through a systematic design approach. A size-efficient coupling system is proposed with the capability of being integrated with additional resonators without increasing the size of the circuit. Two flag-shaped resonators along with two stepped-impedance resonators are integrated with the coupling system to firstly enhance the quality response of the filter, and secondly to add an independent adjustability feature to the filter. The dual passband of the filter is centered at 4.42 GHz and 7.2 GHz, respectively, with narrow passbands of 2.12% and 1.15%. The lower and upper passbands can be swept independently over 600 MHz and 1000 MHz by changing only one parameter of the filter without any destructive effects on the frequency response. According to United States frequency allocations, the first passband is convenient for mobile communications and the second passband can be used for satellite communications. The filter has very good in- and out-of-band performance with very small passband insertion losses of 0.5 dB and 0.86 dB as well as a relatively strong stopband attenuation of 30 dB and 25 dB, respectively, for the case of lower and upper bands. To verify the proposed approach, a prototype of the filter is fabricated and measured showing a good agreement between numerically calculated and measured results.

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“…The transistor squared voltage and half-sinusoidal current waveforms are shaped in the such way that they are not overlapped in the time domain, therefore, the efficiency of the amplifier will be increased. This advantage causes Class-F amplifier to be desirable choice in the high efficiency applications [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Using an ANN Approach to Estimate Output Power and PAE of A Modified Class-F Power Amplifier

Jamshidi

Roshani

Talla

et al. 2020

2020 International Conference on Applied Electronics (AE)

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In this paper, an efficient Class-F power amplifier (PA) is designed, simulated and modeled. This type of amplifier has nonlinear behaviors and uses tuning and controlling harmonics as the most important mechanism to increase efficiency. Feedforward artificial neural network (ANN) model is proposed to predict and estimate the nonlinear output of the power amplifier. The designed amplifier operates at 900 MHz, with 18 dB gain and 70 %Power-Added Efficiency (PAE). In the design process, the artificial neural network model is used to predict PAE and output power parameters as a function of input power, drain voltage and gate voltage of the applied transistor (DC Biasing voltages). The obtained mean relative errors (MREs) are less than 0.03% and 0.09% for the predicted output power and PAE parameters.

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Compact microstrip lowpass filter with ultrasharp response using a square-loaded modified T-shaped resonator

Cited by 32 publications

References 26 publications

Design of a low pass filter using rhombus-shaped resonators with an analyticalLC equivalent circuit

Design of a low pass filter using rhombus-shaped resonators with an analyticalLC equivalent circuit

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

Using an ANN Approach to Estimate Output Power and PAE of A Modified Class-F Power Amplifier

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