PROPAGATION CHARACTERISTICS OF MICROSTRIP LINES (MTLs) WITH DEFECTED GROUND STRUCTURE SLOTS: THEORY AND APPLICATION

2007 ◽  
Vol 16 (05) ◽  
pp. 731-743
Author(s):  
HAIWEN LIU ◽  
LINGLING SUN ◽  
ZHENGFAN LI ◽  
XIAOWEI SUN
Keyword(s):  
Output Power ◽  
Simple Approach ◽  
Second Order ◽  
Voltage Controlled Oscillator ◽  
Propagation Characteristics ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Microstrip Lines ◽  
Photonic Bandgap Structures ◽  
Ku Band

Propagation characteristics, including scattering, dispersion, and loss modeling, of some microstrip lines (MTLs) with defected ground structure (DGS) slots were investigated in this paper. A simple approach was firstly introduced to calculate the slow-wave factors (SWF) of these MTLs with DGS. Based on the above-mentioned theory, a meander MTL structure with periodic DGS slots was proposed and analyzed. The improved SWF and characteristic impedances have been demonstrated, while the bandgap performances have been proved by experimental results. Further, a type of nonuniform DGS slots, which are composed of dual-periodic photonic bandgap structures, was applied to reduce the second-order harmonics and improve the output power of a Ku-band voltage-controlled oscillator. Measurements showed that the second-order harmonics are suppressed by more than - 20 dB and the output power is improved by 3–5%.

scholarly journals A VCO with Harmonic Suppressed and Output Power Improved Using Defected Ground Structure

2003 ◽  
Vol 26 (4) ◽  
pp. 205-211
Author(s):  
Haiwen Liu ◽  
Xiaowei Sun ◽  
Zhengfan Li
Keyword(s):  
Output Power ◽  
Microstrip Line ◽  
Periodic Structures ◽  
Second Harmonic ◽  
Pass Band ◽  
Voltage Controlled Oscillator ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Output Section ◽  
Low Pass

In this paper, a novel defected ground structure (DGS) is proposed for suppressing harmonic and increasing the output power of a voltage-controlled oscillator (VCO) in microwave circuits. The DGS is formed with connecting in parallel two periodic structures which have different center frequencies (in a ratio of 2:3) of the stopband and provides the bandgap characteristic in certain frequency bands. Simulated and experimental results show that the microstrip line with DGS has a wide low-pass band for the fundamental frequency and a stopband for the second harmonic with good performance. To evaluate the effects of DGS on microwave VCOs, two GaAs field-effect transistor (FET) VCOs have been designed and fabricated. One of them has a 50Ωmicrostrip line with DGS at the output section, while the other has only a 50Ωstraight line. Measured results show that DGS suppresses the second harmonic more than−20dBm at the output and yields improved output power by3−5%.

A Ku-Band Wideband Power Divider with Defected Ground Structure

2013 ◽  
Vol 385-386 ◽  
pp. 1292-1295
Author(s):  
Xu Han ◽  
Jian Hua Xu
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Ground Plane ◽  
Power Divider ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Power Split ◽  
Equal Power ◽  
Better Than ◽  
Ku Band

A planar power divider operating over the whole Ku-band is presented. The proposed device utilizes a T-microstrip junction combined with defected ground structure and an elliptical patch at the centre of the T-junction. An isolation resistor is connected across the slotted ground plane. The simulated results of the divider show equal power split, insertion loss is less than 0.3dB, return loss of all ports are better than 15dB, and isolation is better than 15dB over the whole Ku-band.

A Ku-Band Low-Phase-Noise Cross-Coupled VCO in GaAs HBT Technology

2016 ◽  
Vol 25 (06) ◽  
pp. 1650053 ◽  
Author(s):  
Jincan Zhang ◽  
Yuming Zhang ◽  
Hongliang Lu ◽  
Yimen Zhang ◽  
Bo Liu ◽  
...  
Keyword(s):  
Phase Noise ◽  
Output Power ◽  
Oscillation Frequency ◽  
Heterojunction Bipolar Transistor ◽  
Voltage Controlled Oscillator ◽  
High Output Power ◽  
Fully Integrated ◽  
Low Phase Noise ◽  
High Output ◽  
Ku Band

In this paper, a fully integrated Ku-band voltage controlled oscillator (VCO) with low phase noise is presented in a GaAs heterojunction bipolar transistor (HBT) technology. A cross-coupled configuration is employed to achieve low phase noise, and to achieve high output power, the largest HBT and higher bias current are adopted. The implemented VCO demonstrates that the oscillation frequency is from 13.77[Formula: see text]GHz to 14.8[Formula: see text]GHz, with a maximum 4.83[Formula: see text]dBm output power at 13.77[Formula: see text]GHz. The phase noise of the VCO is [Formula: see text]100.2[Formula: see text]dBc/Hz at 1[Formula: see text]MHz offset from 14.36[Formula: see text]GHz oscillation frequency. The VCO consumes 61.2[Formula: see text]mW from 6[Formula: see text]V supply and occupies an area of 0.51[Formula: see text]mm[Formula: see text][Formula: see text]mm. Finally, the figure-of-merits (FOMs) for VCOs are discussed.

scholarly journals Rectangular Zigzag Microstrip Patch Antenna with Swastik Shape DGS for WLAN, C and Ku-Band Applications

2019 ◽  
Vol 8 (9S) ◽  
pp. 280-284
Keyword(s):  
Patch Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Microstrip Patch Antenna ◽  
Area Network ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Microstrip Patch ◽  
Ku Band

A triple band microstrip-fed patch antenna is presented which contains the radiating structure having rectangular zigzag shape patch and an altered ground structure with a swastic shape design. This modified ground plane actually acts as a defected ground structure (DGS). Both the modified ground plane and radiating patch are perfect electric conductors. The patch is imprinted on a substrate named as Epoxy Glass FR-4 having thickness 1.6 mm, relative permittivity 4.4, and loss tangent 0.0024. The designed microstrip patch antenna (MPA) is able to generate three specific operating bands viz. 11.9–13.6 GHz, 5.71–5.82 GHz, 4.5-4.6 GHz with adequate bandwidth of 1.64 GHz, 110 MHz and 100 MHz and corresponding return loss of -32dB, -23dB, -14.3dB respectively covering Wireless Local Area Network (WLAN), C-band and Ku-band applications. A parametric study has been performed for the rectangular slots located in the patch. Proposed MPA is simulated using Computer Simulation Technology Microwave Studio Version 14.0 (CST MWS V14.0). Lastly, the fabrication of the proposed antenna with optimized parameters has been accomplished and measured results for S-parameter magnitude have been discussed

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 Compact Second-order Chebyshev Bandpass Filter Using U-shaped Resonator and Defected Ground Structure

2020 ◽  
Vol 29 (2) ◽  
pp. 321-327
Author(s):  
N. O. Ali ◽  
M. R. Hamid ◽  
M. K. A. Rahim ◽  
N. A. Murad ◽  
S. Thomas
Keyword(s):  
Bandpass Filter ◽  
Second Order ◽  
Defected Ground Structure ◽  
Ground Structure

scholarly journals Wide ku-band log periodic dipole array microstrip patch antena using defected ground structure for electronic support measure

2018 ◽  
Vol 218 ◽  
pp. 03014
Author(s):  
Immanuel Wicaksono ◽  
Dharu Arseno ◽  
Yuyu Wahyu
Keyword(s):  
Radiation Pattern ◽  
Microstrip Antenna ◽  
Microstrip Line ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Band Frequency ◽  
Dielectric Thickness ◽  
Support Measure ◽  
Materials Used ◽  
Ku Band

Microstrip antenna as a supporter of wireless communication, which is the development of conventional antenna, has various advantages contained its predecessor, one of which has a patch that can be modified according to the wishes of the user. Microstrip antenna Log Periodic Dipole Array with Defected Ground Structure is one of the patch modification of antenna that allows antenna to work on wideband frequency 12-18 GHz (Ku-Band). Its use is intended for communication on satellites. In this research, will be designed and realized microstrip antenna with modification of Log Periodic Dipole Array patch working on frequency 12-18 GHz (Ku-band). The design will also use modifications to the ground structure with the use of slots using microstrip line feeding techniques. In this research, microstrip antenna design of Log Periodic Dipole Array with Defected Ground Structure works on 12-18 GHz (Ku-Band) frequency using slot using microstrip line feeding technique, which designed by using application of electromagnetic simulator (Integrated Software). The desired specifications are; gain ≥ 6 dBi, VSWR <2, as well as 6 GHz bandwidth, with unidirectional radiation pattern and linear polarization. Substrate materials used in design are Roger 5880 Duroid with a relative permittivity of 2.2 and a dielectric thickness of 1.57mm. Measurement results on the realization of this tool; return loss on each of the 12, 15, 18 GHz frequency markers of -25,457 dB, -12,939 dB, and -11.004 dB; with the value of VSWR 1.112, 1.593, 1.786. Impedance of 44,988 Ω, 34,129 Ω, 27,792 Ω. Gain respectively of 8.907 dB, 8.931 dB, 8.774 dB. Bandwidth 6 GHz. Unidirectional radiation pattern and elliptical polarization.

An on-chip circular Sierpinski shaped fractal antenna with defected ground structure for Ku-band applications

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Harshavardhan Singh ◽  
Sameen Azhar ◽  
Sanjukta Mandal ◽  
Sujit Kumar Mandal ◽  
Pamidiparthi Ravi Teja Naidu
Keyword(s):  
Frequency Band ◽  
Fractal Antenna ◽  
Cross Polarization ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
On Chip Antenna ◽  
On Chip ◽  
Footprint Area ◽  
Peak Gain ◽  
Ku Band

Abstract In this paper, a circular Sierpinski shaped on-chip fractal antenna with defected ground structure (DGS) is presented for Ku-band applications. The fractal and defected ground structure are employed to achieve higher bandwidth for the entire Ku-band (12–18 GHz). The proposed on-chip antenna (OCA) with a footprint area of 4π mm2 offers wide bandwidth of 7.22 GHz (11.94–19.13 GHz) with the resonating frequency of 15 GHz. At the resonating frequency, the designed antenna shows a peak gain of −19.76 dBi and a radiation efficiency of 55.6%. The co-polarization (CP) and cross-polarization (×P) characteristics of the proposed OCA shows good isolation of 18.05 dBi and 17.44 dBi in the two principal planes with ϕ = 0° and 90° cuts respectively. The measured result of the designed OCA prototype shows a good performance over the desired frequency band.

A novel defected ground structure to improve the output power of a VCO

2003 ◽  
Vol 38 (4) ◽  
pp. 279-281 ◽  
Author(s):  
H. W. Liu ◽  
X. W. Sun ◽  
Z. Q. Cheng ◽  
Z. F. Li
Keyword(s):  
Output Power ◽  
Defected Ground Structure ◽  
Ground Structure
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