• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.9
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• pp.1-5
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• 1999

In this paper, we proposed a novel branch-line coupler using filp-chip technology. The proposed coupler consists of CPW and inverted microstrip. The CPW is on the GaAs flip-chip substrate, and the inverted microstrip is on the alumina main substrate. The ground plane of the CPW is used as a ground plane of the inverted microstrip. And both the transmission lines are connected by solder bump with each other. The characteristics of thisstructure was calculated by FDTD method. The S21, S31 are -3dB and the phase difference is $90^{\circ}$. The calculated characteristics are the same as those of the regular branch-line coupler. This structure can be applied for various kinds of devices using flipchip technology.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.2
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• pp.54-59
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• 2013

This letter presents a shorted-stub tapped branch-line coupler for dual-band applications. In the new design, a shorted stub is used to realize 90 phase change at two frequencies. Closed-form design equations are derived to find the characteristic impedance and electrical length of the proposed branch lines using the ABCD-matrix. To verify the design concept, a microstrip coupler operating at 0.8 and 1.85 GHz is fabricated and measured.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.5
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• pp.108-115
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• 2016

In this paper, the array synthesis horn antenna was designed and measured a radiation power after connecting magnetron. The proposed antenna was designed on the basis of the $4{\times}4$ array synthesis horn antenna characteristics. For suppressing a back-lobe, 2 step short-stub structures were attached to synthesis horn aperture upper and lower. The designed antenna has FBR(Front to Back Ratio) of 39.7 dB. HPBW(Half Power Beam Width) of the E-plane and the H-plane are $8.86^{\circ}$ and $7.35^{\circ}$ each in the measurement. For measuring a radiation power of array antenna that use a magnetron, the waveguide adaptor was designed and connected magnetron with horn antenna. Also, microstrip line coupler that replace a dielectric material with an air gap was designed for measuring a high power. As a result, average radiation output power of the $4{\times}4$ array synthesis horn antenna that connect a four magnetrons had a 0.063W.