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This paper presents a multiband antenna composed of one main monopole and four parasitic poles for the in-building mobile relay system including a firefighting radio band. A main center pole is resonated at 450 MHz of the firefighting band, parasitic poles are considered for the multi-resonance and the beam direction control. The measured results such as the reflection coefficients and the radiation...
This paper presents design for a spiral antenna with conical wall to realize the high gain. To improve the axial ratio and the gain of spiral antenna, the conical wall and the optimized Archimedean slit on ground plane are novel designed for the conventional antenna with the circular cavity wall and with the 4.5-turn slit. The good axial ratio of 1.9 dB below and the improved gain of 9.5 dBi above...
In this paper, we propose a multi-band internal monopole type antenna for mobile station. We design and implement the multi-band internal monopole type antenna for cellular (824 ~ 894 MHz), GPS (Global Positioning System: 1,575.42 MHz), K-PCS (Korea - Personal Communication Service: 1,750 ~ 1,870 MHz) and S-DMB (Satellite-Digital Multimedia Broadcasting: 2,630 ~ 2,655 MHz) frequency bands with three...
In this paper, a dual-band square patch antenna with circular polarization is designed and implemented for the reception of GPS and DMB. The design example offers advantages in size, cost, and performance. The design example also shows sufficient impedance bandwidth (VSWR les 2) for two operation bands. The implemented antenna has a good radiation pattern characteristic, therefore, we expect that...
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