| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 104 === This thesis introduces CPW-fed slot dipole antennas for broadband and multiband applications. In the second section, we introduce an inductively-coupled CPW-fed slot dipole antenna. This thesis presents a series of broadband uniplanar antenna design. The design shows five pairs of protruded slot line in conjunction with the ends of rectangular aperture pairs. Each operation band is controlled by a respective resonating path resulting in a high design freedom. The antenna produces five modes to cover DCS (1.71 GHz to 1.88 GHz), PCS (1.85 GHz to 1.99 GHz), WCDMA (1.92 GHz to 2.17 GHz), WLAN (2.4 GHz to 2.5 GHz) and LTE2500 (2.5 GHz to 2.69 GHz). The fabricated antenna with 10-dB fractional bandwidth is up to 80%. The proposed antenna achieves a near omnidirectional radiation while horizontal (ϕ) polarization and bidirectional radiation while vertical (θ) polarization in the x-z plane and the y-z plane.
In the third section, we introduce a capacitively-coupled CPW-fed slot dipole antenna. The proposed antenna presents 12.9%, 2.52% and 5.33% of greater than 10-dB return loss (RL) at center frequency of 2.49 GHz, 3.57 GHz and 5.25 GHz, respectively. By adding the multiple protruded slots, one can achieve multiband resulting in a high design freedom. The three operation frequencies applied in WLAN2400 (2.4 GHz to 2.5 GHz), WiMAX (3.4 GHz to 3.69 GHz) and WLAN5200 (5.15 GHz to 5.35 GHz). The proposed antenna achieves a near omnidirectional radiation H-plane patterns.
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