• Journal of the Korean Magnetics Society
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• v.14 no.5
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• pp.174-179
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• 2004

Attenuation of conduction noise through microstrip line attached with the high lossy iron flakes-rubber composites has been investigated in GHz frequencies. Microstrip line was designed with characteristic impedance of 50 $\Omega$ and a length corresponding to the center frequency of 3 GHz. Iron flakes were fabricated by mechanical forging of spherical iron powders using an attrition mill. The fabricated microstrip line shows a ideal propagation characteristics of S$\sub$11/ < -60 dB and S$\sub$21/ = 0 dB. Attaching a noise absorbing sheet on the microstrip line, S$\sub$11/ increases to about -10 dB and S$\sub$21/ decreases to -20～-60 dB depending on the length of absorbing sheet. The calculated power loss is as high as 80% in the frequency range 2～8 GHz. It is suggested that the most critical material parameter is magnetic loss for the enhancement of noise attenuation.

• Journal of the Korean Institute of Telematics and Electronics
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• v.19 no.3
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• pp.13-18
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• 1982

This Paper is an experimental study on the effective dielectric constant of microstrip line. To quantify the dispersive effects on a microstrip line, the effective dielectric constant, which is the ratio of free space wavelength to guide wavelength, is calculated for teflon substrates. The calculation is based on the Fourier transform of the current distribution on microstrip line. Measurements of effective dielectric constant using a microstrip elliptic resonator and ring resonator are also described. As a result, the computed values of effective dielectric constant agree almost all with measured values, using ring and elliptic resonator, in case of w/h or the ratio of microstrip width to substrate thickness equal unity over frequency range of 8 to 12GHz.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.7
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• pp.67-71
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• 2008

We report the waveguide to microstrip transition using probe structure for Ka-band transceiver. The waveguide to microstrip transition is composed of probe, inductive line, ${\lambda}/4$ impedance transformer, and $50{\Omega}$ microstrip line. For design of the transition, we optimized the characteristic impedances and the lengths of the component parts. The fabricated transition exhibits an insertion loss of 1.3 dB and the input/output return losses of below 14 dB between 30 and 40 GHz. The insertion loss of each transition is about $0.5{\sim}0.6dB$, considering the losses in the microstrip line and input/output waveguides.

• Journal of the Korean Institute of Telematics and Electronics
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• v.16 no.1
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• pp.33-39
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• 1979

The resonance frequency of the slot-line resonator in the shielding box is analyzed. It is verified experimentally that an X-Band oscillator may be realized by the resonator in the microstrip circuit mount as a shielding cavity, and by shunt-connecting the IMPACT diode on the slot-line, And the oscillating power can be coupled with the microstrip by the coupling aperure on the opposite surface of the microstrip by the coupling aperure on the opposite of the substrate of the microstrip cirsuit.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2294-2296
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• 2005

Multilayer microstrip lines are an integral part of an MMIC. This paper presents an analysis of multilayer GaAs-MMIC microstrip line using a spectral domain method(SDM) taking into account the effect of the variation in the thickness of various layers of substrates on the characteristic impedance and the effective dielectric constant of the line. This work is expected to be useful in GaAs foundries for accurate CAD modelling of the microstrip lines up to 40GHz.

• ETRI Journal
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• v.44 no.2
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• pp.260-273
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• 2022

This study presents a novel multilayer structure of parallel coupled-line bandpass filtercentered at 2.42 GHz with a fractional bandwidth value of approximately 19.4%. The designed filter can suppress harmonics with an appropriate frequency response by incorporating different techniques based on the multilayer technique. A combination of different techniques such as radial microstrip stubs and defected ground structure (DGS) and defected microstrip structure techniques are employed to suppress harmonics up to 5f₀. These techniques are used in two layers to suppress up to 5f₀. In addition, in this study, the effects of different parameters, such as the width of slot-line DGS, the angle of diagonal line slots in the upper layer, and the air gap between the two layers on the filter performance, are investigated. To verify the correct circuit operation, the designed filter is implemented and tested. The measurement results of the proposed filter are compared with the simulation results.

• ETRI Journal
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• v.33 no.6
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• pp.985-988
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• 2011

A novel application of a dual-transmission line is proposed to design a lowpass filter (LPF). The proposed structure uses only transmission line elements to produce an equiripple LPF response with sharp roll-off. Design equations are derived using a lossless transmission line model. Controlling the electrical lengths, three transmission-zeros are realized in the stopband to obtain a sharp roll-off rate and wide stopband bandwidth. A single unit microstrip LPF with a 3-dB cut-off frequency at 1.0 GHz having a roll-off of 135 dB/GHz along with a stopband bandwidth of 69.5% is designed for validation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.14 no.5
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• pp.435-441
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• 1989

The three rectangular microstrip patch antenna of Resonant length, lambda/2 or , between two slot is designed by using the ring feed line, and the radiation pattern characteristic is showen. In case of the antenna of resonant length lambda/2 the radation pattern is shown at each antenna element, in the antenna of resonant length it is shown among patch antenna element.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.14 no.5
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• pp.542-548
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• 1989

Rectangular microstrip antenna array using Chebyscheff polynomial is designed. The required relative currents in the rectangular microstrip array antenna are 1:2:2:1. The input admittance and returen loss of array antenna are calculated from transmission line model circuit include feed line. The calculated resonant frequency valused are in good agreement with measured values. Also, the sharp beam scanning characteristic of perfect electronic method is presented.

• Journal of the Microelectronics and Packaging Society
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• v.12 no.1 s.34
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• pp.17-20
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• 2005

In this paper, we presented the quasi-static characteristics of novel microstrip lines with anisotropic grooved dielectric in finite metal. A quasi-static mode-matching method has been used to analyze this new structure and the simulation results are validated through comparison with other available results. The results in this paper show that it is possible to control the propagation characteristics of microstrip lines with the use of anisotropic grooved dielectric in finite metal. Also anisotropic grooved dielectric in microstrip line can be newly added to the design parameters of high performance three dimensional monolithic microwave circuits and other microwave applications.