• Title/Summary/Keyword: Defected Ground Structure(DGS)

Search Result 119, Processing Time 0.029 seconds

Design of Coupled Resonators Bandpass Filter with Defected Ground Structure

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
    • /
    • v.9 no.2
    • /
    • pp.150-154
    • /
    • 2011
  • In this paper a four-pole elliptic function bandpass filter is designed with two ground slots. A research of microstrip bandpass filters (BPF) using defected ground structures (DGS) is presented. DGS technique allows designs of tight couplings without the necessity of using very narrow coupling gaps. The simulator Sonnet is used to design the resonator and to calculate the coupling coefficient of the basic coupling structure. Compared to similar microstrip filters without defected ground structure, the simulated performances of these novel structures indicate some technological advantages.

Homogeneous Dual Composite Right/Left-Handed Metamaterial Using Subwavelength Defected Ground Structure(DGS) (Subwavelength 결함접지구조(defected grounded structure : DGS)를 이용한 Homogeneous Dual Composite Right/Left-Handed 메타물질 구현)

  • Park, Woo-Young;Lim, Sung-Joon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.58 no.11
    • /
    • pp.2242-2246
    • /
    • 2009
  • In this paper, a homogeneous dual composite right/left-handed (D-CRLH) transmission line (TL) is proposed by using a defected ground structure (DGS) on the ground plane. In order to satisfy a homogeneity condition of metamaterial, a subwavelength unit cell is designed by way of a spiral DGS and a meander stub. From a dispersion diagram, it is expected that the frequency bands for the left-handed (LH) property is 3.5 - 4.4 GHz. At 3.8 GHz in the LH band, backward propagating phenomenon is observed from full-wave analysis. The experimental results show that the proposed TL has a stop-band in 1.75 - 3.6 GHz.

Design of Small-Size High-Power SPDT PIN Diode Switch with Defected Ground Structure for Wireless Broadband Internet Application (결함접지구조(Defected Ground Structure)를 갖는 휴대 인터넷용 소형 고전력 SPDT PIN 다이오드 스위치 설계)

  • Kim Dong-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.16 no.10 s.101
    • /
    • pp.1003-1009
    • /
    • 2005
  • In this paper, small-size high-power single pole double throw(SPDT) switch with defected pound structure(DGS) is presented for wireless broadband internet application. To reduce the circuit size using slow-wave characteristic, the DGS is applied to ${\lambda}/4$ transmission line of the switch and the measured results are compared with them of conventional switch. To secure high degree of isolation, the switch with the DGS is composed of shunt-connected PIN diodes and shows insertion loss of 0.8 dB and isolation more than 50 dB at 2.3 GHz. The size of the switch is reduced about $50\%$ only with the DGS patterns while it has very similar performance to the conventional shunt-type switch.

A Novel Design of Frequency Multiplier Using Feedforward Technique and Defected Ground Structure (Feedforward와 Defected Ground Structure를 이용한 주파수 체배기 설계)

  • Park Sang-Keun;Lim Jong-Sik;Jeong Yong-Chae;Kim Chul-Dong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.17 no.8 s.111
    • /
    • pp.725-731
    • /
    • 2006
  • A novel design of frequency multiplier using a feedforward technique and a defected ground structure(DGS) is proposed. The feedforward loop in the proposed frequency multiplier suppresses the fundamental component $(f_0)$, the dumb-bell or spiral shaped DGS diminish unwanted harmonics such as second, third and fourth. Due to the combination of the feedforward structure and the DGS, only the multiplied frequency component$(2f_0,\;3f_0,\;4f_0)$ appears at the output port and the other unwanted components are suppressed excellently. The frequency multiplier is designed at 1 GHz $(f_0)$, by the proposed technique and measured. The measured output power of $2f_0,\;3f_0$ and $4f_0$ is -2.59 dBm, -5.36dBm and -4.57dBm, respectively, when the input power is 0dBm.

Design of Compact Coupled Resonators Bandpass Filter with Defected Ground Structure (결함접지면 구조를 갖는 소형 결합 공진기 대역통과 여파기의 설계)

  • Xie, Tang-Yao;Park, Young-Bea;Kim, Gi-Rae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2010.10a
    • /
    • pp.367-370
    • /
    • 2010
  • In this paper a four-pole elliptic function bandpass filter is designed with two ground slots. A research of microstrip bandpass filters (BPF) using defected ground structures (DGS) is presented. DGS technique allows designs of tight couplings without the necessity of using very narrow coupling gaps. The simulator Sonnet is used to design the resonator and to calculate the coupling coefficient of the basic coupling structure. Compared to similar microstrip filters without defected ground structure, the simulated performances of these novel structures indicate some technological advantages.

  • PDF

A Novel DGS resonator with Attenution Pole and Design of Bandpass Filter using DGS resonator (감쇄극을 갖는 새로운 DGS(Defected Ground Structure) 공진기와 DGS 공진기를 이용한 대역통과 여파기 설계)

  • Yoon, Jang-Sik;Joung, Myoung-Sub;Park, Jun-Seok;Park, Cheon-Seok
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • 2003.11a
    • /
    • pp.380-383
    • /
    • 2003
  • In this paper, we analyzed the characteristics of a modified DGS(Defected Ground Ground Structure)and extracted the equivalent citcuit of that. The proposed DGS is the structure that connects two DGS units, which are composed of the defects on the metallic ground plane and the gab on the signal line. The gab on the signal line was adopted to induce series capacitor of band pass filter. Also, to confirm the validity of the proposed structure, we designed and implemented C - Band pass filter by using the modified DGS.

  • PDF

A Study for DPDT Switch Design with Defected Ground Structure (DGS 구조를 이용한 DPDT 스위치 설계에 관한 연구)

  • An Ka-Ram;Jeoung Myeung-Sub;Lim Jae-Bong;Cho Hong-Goo;Park Jun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.54 no.3
    • /
    • pp.132-138
    • /
    • 2005
  • In this paper a DPDT(Double-Pole Double Through) switch with defected ground structure(DGS) is proposed. The equivalent circuit for the proposed switch structure is derived according to based on equivalent circuit of proposed DGS unit structure. The equivalent circuit parameters of DGS unit are extracted by using the circuit analysis method. The on/off operation of the proposed switch is obtained by varying the capacitance of the varactor diode at the defected ground plane. In the case of ON state, the insertion loss of the fabricated DPDT was shown under 1dB. And in OFF state, we found the rejection characteristic over 20dB at the designed frequency 2.45GHz. The experimental results show excellent insertion loss at on state and isolation at off state.

Design of a CPW Lowpass Filter Using DGS (Defected Ground Structure) (DGS (Defected Ground Structure)를 이용한 CPW 저역 통과 여파기)

  • 신한철;윤태순;김기병;이종철;김종헌;이병제;김남영
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • 2002.11a
    • /
    • pp.59-62
    • /
    • 2002
  • In this paper, low-pass filters using DGS-CPW cell are suggested. The bandwidth of stopband is extended up to 3 times of cutoff frequency. The novel DGS-CPW cell reduces the size of the circuit. This structure can be used in microwave and milimeter-wave circuits.

  • PDF

A design of a lowpass filter using Quad-Spiral Defected Ground Structure (Quad-Spiral Defected Ground Structure를 이용한 저역통과 여파기 설계)

  • Jeong, Yong-Woo;Kim, Chul-Soo;Park, Kyu-Ho;Ahn, Dal
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
    • /
    • 2003.11a
    • /
    • pp.343-346
    • /
    • 2003
  • A new structure to design low pass filters (LPFs) is presented rho proposed structure has the etched shape of Quad-Spiral DGS(Defected Ground Structure) on microstrip transmission lines. By extracting the equivalent circuit elements of unit Quad-Spiral DGS, LPFs are designed easily. The equivalent circuit of Quad-Spiral DGS consists of a step impedance resonator and lumped elements. The proposed LPF provided steep rejection characteristics with 5-poles. Experimental results show excellent agreements with circuit simulation results in wide band and the validity of our circuit modeling for LPF design. The result shows another possibility of Quad Spiral DGS for microwave devices.

  • PDF

A Design of 5.8 ㎓ Oscillator using the Novel Defected Ground Structure

  • Joung, Myoung-Sub;Park, Jun-Seok;Lim, Jae-Bong;Cho, Hong-Goo
    • Journal of electromagnetic engineering and science
    • /
    • v.3 no.2
    • /
    • pp.118-125
    • /
    • 2003
  • This paper presents a 5.8-㎓ oscillator that uses a novel defected ground structure(DGS), which is etched on the metallic ground plane. As the suggested defected ground structure is the structure for mounting an active device, it is the roles of a feedback loop inducing a negative resistance as well as a frequency-selective circuit. Applying the feedback loop between the drain and the gate of a FET device produces precise phase conversion in the feedback loop. The equivalent circuit parameters of the DGS are extracted by using a three-dimensional EM simulation ,md simple circuit analysis method. In order to demonstrate a new DGS oscillator, we designed the oscillator at 5.8-㎓. The experimental results show 4.17 ㏈m output power with over 22 % dc-to-RF power efficiency and - 85.8 ㏈c/Hz phase noise at 100 KHz offset from the fundamental carrier at 5.81 ㎓.