• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.11
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• pp.12-17
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• 1999

In this paper, we proposed a novel CB-CPW(Conductor Backed CPW) for suppression of crosstalk caused by PPL(Parallel Plate Line) mode in the millimeter wave frequency. The proposed structure is formed by the GaAs main substrate attached on the Si lossy layer. The PPL mode can be suppressed by the Si lossy layer of conductivity ${\sigma}$, and it reduces the crostalk between the nearby transmission lines. Using 200 um thick Si substrate of ${\sigma}$ = 30S/m, as the lossy layer, the crosstalk can be suppressed below - 40 dB at 60 GHz. The proposed method is costly effective because inexpensive Si wafer is employed to suppress the PPL mode, and it can be used in the various types of millimeter wave applications.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.9 s.112
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• pp.883-889
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• 2006

In this paper, parasitic resonance modes generated in a conductor backed coplanar wave guide(CBCPW) and stripline band pass filter(BPF) and the oscillation phenomena of a 40 GHz power amplifier module(PAM) are analyzed and several methods to suppress them are presented for low-temperature co-fired ceramic(LTCC) based millimeter-wave RF System-in-Package(SiP) applications. Parasitic rectangular wave guide(RWG) modes of the CBCPW structure are completely suppressed in the operation frequency band by decreasing the distance between its vias and by increasing the mode frequency. In the stripline structure, RWG resonance modes are clearly eliminated by removing some vias facing each other and by placing them diagonally. In the case of the 40 GHz PAM, in order to reduce a cross talk due to radiation that is generated from interconnection discontinuities, high isolation structures such as embedded DC bas lines and CPW signal lines are used and then the oscillated PAM is improved.