scholarly journals A New Microstrip Filter Using CRLH Structure and Defected Ground Structure in Antenna Application

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Xin Cao ◽  
Zongxi Tang ◽  
Fei Wang ◽  
Yunqiu Wu ◽  
Biao Zhang
Keyword(s):  
Bandpass Filter ◽  
Resonance Mode ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Excellent Performance ◽  
Microstrip Filter ◽  
Left Handed ◽  
Measurement Results ◽  
Good Agreement ◽  
Interdigital Capacitors

A new microstrip bandpass filter using composite right/left-handed (CRLH) mushroom structure with interdigital capacitors and defected ground structure (DGS) is proposed. The proposed filter uses CRLH mushroom structure working at its first negative resonance mode to create the passband and DGS to increase rejection outside the passband. Simulation and measurement results are in good agreement, and low in-band insertion loss and great out-band rejection have been achieved. It is demonstrated that the combination of CRLH mushroom structure with interdigital capacitors and DGS has succeeded in achieving excellent performance. This new filter can be applied in transmitting and receiving antennas.

scholarly journals Design of a SIW Bandpass Filter Using Defected Ground Structure with CSRRs

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Weiping Li ◽  
Zongxi Tang ◽  
Xin Cao
Keyword(s):  
Bandpass Filter ◽  
Simulation Software ◽  
Ring Resonators ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Resonant Modes ◽  
Measurement Results ◽  
Good Agreement

In this paper, a substrate integrated waveguide (SIW) bandpass filter using defected ground structure (DGS) with complementary split ring resonators (CSRRs) is proposed. By using the unique resonant properties of CSRRs and DGSs, two passbands with a transmission zero in the middle have been achieved. The resonant modes of the two passbands are different and the bandwidth of the second passband is much wider than that of the first one. In order to increase out-of-band rejection, a pair of dumbbell DGSs has been added on each side of the CSRRs. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measurement results are in good agreement with the simulated ones.

scholarly journals DEFECTED GROUND COPLANAR MULTI-BAND-PASS MICROSTRIP FILTER

2021 ◽  
Vol 9 (1) ◽  
pp. 64-68
Author(s):  
Reena Pant, Rakesh Kumar Maurya, Pradyot Kala
Keyword(s):  
Ground Plane ◽  
Inductive Coupling ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Microstrip Filter ◽  
Coupling Technique ◽  
Filter Performance ◽  
Band Pass ◽  
5 Ghz ◽  
Good Agreement

This paper presents a combination of an inductive coupling technique and coplanar ground plane microstrip filter. Here, inductive coupling technique is used to overcome the unwanted radiation loss generated by the gap between the co-planar ground plane and the transmission line which improves filter characteristics. A defected ground structure (DGS) is integrated with the proposed filter to achieve a tri-bandpass characteristic (1.85, 3.53, and 5 GHz) without hampering the filter performance. The experimental results of the proposed filter are found in good agreement with simulated results.

scholarly journals Harmonic-Rejection Compact Bandpass Filter Using Defected Ground Structure for GPS Application

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Haiwen Liu ◽  
Baoping Ren ◽  
Xiang Xiao ◽  
Zhichong Zhang ◽  
Shen Li ◽  
...  
Keyword(s):  
Design Methodology ◽  
Bandpass Filter ◽  
Second Order ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Rejection Level ◽  
Better Than ◽  
Good Agreement

A miniaturized bandpass filter (BPF) using defected ground structure (DGS) resonator with the characteristic of harmonic rejection is developed in this paper. The second and third harmonics of the proposed BPF are rejected by the characteristic of stepped-impedance DGS resonator. Moreover, open stubs are established so that two adjustable transmission zeros can independently be created to extend the stopband and improve the rejection level. Finally, a second-order BPF, centered at 1.62 GHz with a stopband extended up to 5.6 GHz and a rejection level better than 20 dB, is designed and implemented for GPS application. A good agreement between simulation and measurement verifies the validity of this design methodology.

scholarly journals A Microstrip MIMO Antenna with Enhanced Isolation for WiMAX Applications

2019 ◽  
Vol 2019 (2) ◽  
pp. 99-105
Author(s):  
Nguyễn Ngọc Lan ◽  
Nguyễn Thị Thu Hằng ◽  
Hồ Văn Cừu
Keyword(s):  
Radiation Efficiency ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
High Radiation ◽  
Central Frequency ◽  
Mimo Antenna ◽  
High Isolation ◽  
Measurement Results ◽  
Multiple Input ◽  
Good Agreement

In this paper, a multiple-input multipleoutput (MIMO) antenna with high isolation is designed using defected ground structure (DGS). The proposed antenna is constructed by two sets of four elements (2×2), which are designed at the central frequency of 3.5 GHz for Worldwide Interoperability for Microwave Access (WiMAX) applications. The antenna is fabricated on a FR4 substrate with an overall size of 144 × 99 × 1.6 mm. Thanks to DGS, the designed MIMO antenna achieves a high isolation of 30 dB and a high radiation efficiency of over 90%. Besides, this MIMO antenna attains a 7.5 dBi gain. There is a good agreement between the simulated S-parameters and the measurement results.

Inverted L-slot triple-band antenna with defected ground structure for WLAN and WiMAX applications

2015 ◽  
Vol 9 (1) ◽  
pp. 191-196 ◽  
Author(s):  
Alaknanda Kunwar ◽  
Anil Kumar Gautam ◽  
Binod Kumar Kanaujia
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Compact Size ◽  
Measurement Results ◽  
Good Agreement ◽  
Triple Band

To incorporate two different communication standards in a single device, a compact triple-band antenna is proposed in this paper. The proposed antenna is formed by etching an inverted L-shaped slot on the patch with defected ground structure. The antenna is targeted to excite three separate bands first from 2.39–2.51, second from 3.15–3.91, and third from 4.91–6.08 GHz that covers entire Wireless Local Area Network (WLAN) (2.4/5.2/5.8 GHz) and Worldwide Interoperability for Microwave Access (WiMAX) (2.5/3.5/5.5) bands. Thus, the proposed antenna provides feasibility to integrate WLAN and WiMAX communication standards in a single device with good radiation pattern quality. Furthermore, a prototype of the proposed antenna fabricated and measured to validate the design, shows a good agreement between simulated and measured results. The simulation and measurement results show that the designed antenna is capable of operating over the 2.39–2.51 GHz, 3.15–3.91 GHz, and 4.91–6.08 GHz frequency bands while rejecting frequency ranges between these three bands. The proposed antenna offers a compact size of 20 × 30 mm2 as compared with earlier reported papers.

Frequency-reconfigurable microstrip filter with dual-mode resonators using RF PIN diodes and DGS

2014 ◽  
Vol 7 (6) ◽  
pp. 661-669 ◽  
Author(s):  
Hesham A. Mohamed ◽  
Heba B. El-Shaarawy ◽  
Esmat A.F. Abdallah ◽  
Hadia M. El-Hennawy
Keyword(s):  
Bandpass Filter ◽  
Low Frequency ◽  
Ultra Wideband ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Dual Mode ◽  
Microstrip Resonator ◽  
Pin Diodes ◽  
Microstrip Filter ◽  
Structure Pattern

This work presents a novel frequency miniaturized reconfigurable dual-mode stub-loaded resonator switchable from bandpass filter to single/double-notched bandnotch filter. The proposed filter topology employs RF PIN diodes as the switching device. Based on the odd- and even-mode equivalent circuits, the resonant characteristics of the proposed microstrip resonator are investigated. The defected ground structure pattern enhanced the performance; the 3-dB bandwidth reached 63%, with insertion loss of −0.5 dB. There was great sharpness of 55 dB in the low-frequency edge (from 1.7982 to 1.8466 GHz) and 33 dB in the high-frequency edge (from 3.4329 to 3.4995 GHz). The frequency-reconfigurable microstrip filter has been designed, fabricated, and measured for application in narrow band and ultra-wideband.

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