| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 98 === The purpose of this paper the design of innovative antenna structure, Application for global digital television receiver in handheld mobile devices (470 MHz ~ 862 MHz) and 3G systems (GSM900 / PCS1800 / UMTS), to overcome the problem of antenna is too long in Multimedia mobile communications device, the proposed antenna can be used to any printed circuit board. In this paper proposed two kind of miniaturized antenna, the DTV and 3G mobile phone antenna respectively.
A printed chip type antenna using spiral monopole slot structures on system ground for DTV signal reception in the UHF band is proposed in this paper. By utilizing the eight quarter-wavelength of spiral slot likes a radiator in configuration. In this case, the occupied area of the monopole slot chip antenna on the system circuit board can be further reduced. Antenna has a compact size of 20×20×0.8mm3.
The proposed PIFA has a simple structure of comprising λ/4 radiating strips of length about at 900 to cover the GSM850/GSM900 bands and using a interdigital capacitor coupling feed. The two radiating strips also generate two higher-order modes or λ/4 modes at about 2100 MHz to form a wide upper band for GSM1800/1900/DCS/PCS/UMTS bands and the 2.4-GHz WLAN (IEEE 802.11b) band operation. Further, the antenna has a simple planar structure and occupies a small area of 10 × 40 mm2 or 400 mm2 on the system circuit board of the mobile phone.
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