UWB Filtering Power Divider with Two Narrow Notch-bands and Wide Stop-band

Frequenz ◽  
2017 ◽  
Vol 72 (1-2) ◽  
Author(s):  
Feng Wei ◽  
Xin-Yi Wang ◽  
Xin Tong Zou ◽  
Xiao Wei Shi
Keyword(s):  
Stop Band ◽  
Ultra Wideband ◽  
Power Divider ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Notch Band ◽  
Left Handed ◽  
Simulation And Experiment ◽  
Wilkinson Power Divider

AbstractA compact filtering ultra-wideband (UWB) microstrip power divider (PD) with two sharply rejected notch-bands and wide stopband is analyzed and designed in this paper. The proposed UWB PD is based on a conventional Wilkinson power divider, while two stub loaded resonators (SLRs) are coupled into two symmetrical output ports to achieve a bandpass filtering response. The simplified composite right/left-handed (SCRLH) resonators are employed to generate the dual notched bands. Defected ground structure (DGS) is introduced to improve the passband performance. Good insertion/return losses, isolation and notch-band rejection are achieved as demonstrated in both simulation and experiment.

scholarly journals Novel Wilkinson Power Divider with an Isolation Resistor on a Defected Ground Structure with Improved Isolation

2021 ◽  
Vol 11 (9) ◽  
pp. 4148
Author(s):  
Maaz Salman ◽  
Youna Jang ◽  
Jongsik Lim ◽  
Dal Ahn ◽  
Sang-Min Han
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Ground Plane ◽  
Three Dimensional ◽  
Matching Theory ◽  
Power Divider ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Lumped Elements ◽  
Wilkinson Power Divider

A modified Wilkinson Power Divider is proposed in this paper that utilizes defected ground structure (DGS) in parallel with an isolation resistor. The proposed DGS section is incorporated between the output ports, and the isolation resistor is soldered in parallel with the DGS in the ground plane, instead of on the top plane as in a conventional Wilkinson power divider, to achieve improved or preferable isolation. The proposed design is comprised of two pairs of microstrip transmission lines with equal impedances and varied electrical lengths. The parameters of the main circuit and the DGS section are acquired separately. The parameters of the proposed main circuit are derived by applying conjugate matching theory. Dumbbell-shaped DGS is introduced in the ground plane between the output ports, which acts as a parallel resonator, yielding an attenuation pole at the resonant frequency that contributes to improved isolation. By applying the previous well-known circuit theory, the lumped elements of the equivalent circuit of the DGS were achieved. The physical dimensions of the equivalent circuit for the DGS section were obtained by three-dimensional EM simulation. The measured results show improved isolation, return loss and better bandwidth as compared with other similar works. Furthermore, the proposed circuits designed at resonating frequencies of 3 and 2 GHz presented comparatively good return losses, S11 of about −25.54 and −31.24 dB, respectively, and achieved improved isolations, S32 between the output ports, in an order of about −40.83 and −36.05 dB, respectively, which is rather exceptional and desirable.

scholarly journals Design Research of Wearable Textile Antena

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1546-1550
Keyword(s):  
Dielectric Constant ◽  
Electromagnetic Interference ◽  
Design Research ◽  
Stop Band ◽  
Ultra Wideband ◽  
Defected Ground Structure ◽  
Analysis And Design ◽  
Low Dielectric ◽  
Notch Band ◽  
Textile Antenna

In this paper comprehensive analysis and design of textile antenna is presented. Low dielectric constant of textile material makes them suitable to be used as substrate. The proposed antenna is fabricated on jeans substrate having dielectric constant of 1.6. The proposed textile antenna has hexagonal shape with microstrip line feed .U shape slot on the patch and defected ground structure is incorporated in the design to obtain desired passband and stopband. The dimension of proposed hexagonal patch is 6.44 mm and its area is 108mm2 which is very compact as compared to previous works .This antenna can be used in two frequency bands one is centered at 3.9 GHz with bandwidth of 2.5 GHz and another is centered at 8.6 GHz with bandwidth of 2.4GHz.Along with these passband there is one stop band in the frequency range 5.1GHz to 8.1 GHz. Due to wide bandwidth this antenna can also be called as an ultra wideband antenna with notch band to avoid electromagnetic interference with WLAN (5.1 -5.8 GHz) and satellite application.

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