Capacitive Loaded U-Slot Defected Ground Structure for Bandstop Filter With Improvement Q Factor

Liu, Gang; Wang, Zhuoying; Wu, Jiajia; Li, and Lin

doi:10.2528/pierl16111002

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(i) Using Equation (5), impedance matching at the filter ports can be achieved by setting the values of the strip and slot widths, w and s, respectively so as to get Z 0 = 50 Ω. (ii) Using the curve presented in Figure 6(a), the required resonance frequency, f R , is satisfied by setting the resonator length, L R , to the value corresponding to f R value while keeping the coupling length L B constant.…”

Section: Procedures For the Optimal Design Parameters Of The Bandstop mentioning

confidence: 99%

“…Such resonators can be used to design high Q-factor bandpass and bandstop filters. Microwave high Q-factor bandstop filters have been widely used in communication systems for rejecting unwanted frequency signals to enhance the system performance [5][6][7][8]. For example, in satellite communication systems, particularly in the transceiver of the ground station, the bandstop filters are often needed in the frond-end to pass the downlink signals received by the ground station antenna and to block the uplink signals originated at the transmitting antenna of the same ground station.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

Fahmy¹,

Farahat²,

Hussein³

et al. 2020

PIER B

View full text Add to dashboard Cite

High Q-factor bandstop filter based on broadside-coupling between U-shaped coplanar waveguide (CPW) resonator and CPW through-line (CPWTL) is proposed in the present paper. The CPWTL is printed on the top layer of the dielectric substrate whereas the CPW resonator (CPWR) is printed on the bottom layer. Only over very narrow frequency band around the resonant frequency of the CPWR the microwave power flowing in the CPWTL is coupled to (absorbed by) the CPWR leading to a bandstop filter of very high Q-factor. A CPWR with side ground strips of finite width is shown to have much higher Q-factor than that of infinitely extending side ground planes. Owing to the lower profile of the CPW with finite-width, the radiation loss is reduced, and the structure has narrower frequency band for coupling, which results in much higher Q-factor than other published works. The dimensions of the CPWTL are optimized for impedance matching whereas the dimensions of the Ushaped CPWR are optimized to obtain the highest possible Q-factor. The effect of the loss tangent of the dielectric substrate material on the Q-factor is investigated. A prototype of the proposed filter is fabricated and experimentally studied for more understanding of the underlying physical principles of operation and for experimental investigation of the filter performance. The experimental measurements show good agreement with the corresponding simulation results.

show abstract

Section: Procedures For the Optimal Design Parameters Of The Bandstop mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

Fahmy¹,

Farahat²,

Hussein³

et al. 2020

PIER B

View full text Add to dashboard Cite

show abstract

Dual-Band BSF with Enhanced Quality Factor

Farahat¹,

Hussein²

2021

ACES

View full text Add to dashboard Cite

In the present work, a U-shaped CPW resonator (CPWR) with, generally, unequal arms is proposed to produce high Q-factor bandstop filter (BSF) based on broadside-coupling between the CPWR and a CPW through-line (CPWTL), which are printed on opposite faces of a thin substrate. The unequal arms of the U-shape and the finite width of the ground strips of the CPWR are shown to produce much higher Q-factor than that of equal arms and infinitely extending side ground planes. The dimensions of the CPWTL are optimized for impedance matching while the dimensions of the CPWR are optimized to obtain the highest Q-factor. The effect of the loss tangent of the dielectric substrate material on the Q-factor is investigated. It is shown that the difference between the lengths of the unequal arms of the U-shaped resonator can be used to control the Q-factor. Thanks to the computational efficiency of the employed electromagnetic simulator, enough number of trials has been successfully performed in reasonable time to arrive at the final design of the BSF. A prototype of the proposed BSF is fabricated for experimental investigation of its performance. The experimental measurements show good agreement when compared with the corresponding simulation results.

show abstract

Capacitive Loaded U-Slot Defected Ground Structure for Bandstop Filter With Improvement Q Factor

Cited by 2 publications

References 7 publications

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

High Q-Factor Bandstop Filter Based on CPW Resonator Broadside-Coupled to CPW Through-Line

Dual-Band BSF with Enhanced Quality Factor

Contact Info

Product

Resources

About