摘要(英) |
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. |
參考文獻 |
[1] H.-D. Chen, “Broadband CPW-fed square slot antenna with a widened tuning stub,” IEEE Trans. Antennas Propag., vol. 51, no. 8, pp. 1982–1986, Aug. 2003.
[2] X.-C. Lin and L.-T Wang, “A broadband CPW-fed loop slot antenna with harmonic control,” IEEE Antennas Wireless. Propag. Lett., vol. 2, pp. 323–325, 2003.
[3] Y.-C. Lin and K.-J. Hung. “Compact ultrawideband rectangular aperture antenna and band-notched designs,” IEEE Trans. Antennas Propag., vol. 54, no. 54, pp. 3075–3081, Nov. 2006.
[4] R. G. Pierce, A. J. Blanchard and R. M. Henderson. “Broadband planar modified aperture bowtie antenna,” IEEE Antennas Wireless. Propag. Lett., vol. 12, pp. 1432–1435, 2013.
[5] A. U. Bhobe, C. L. Holloway, M. Piket-May, and R. Hall. “Wide-band slot antennas with CPW feed Lines: Hybrid and log-periodic designs,” IEEE Trans. Antennas Propag., vol. 52, no. 10, pp. 2545–2554, Oct. 2004
[6] D. D. Krishna, M. Gopikrishna, C. K. Anandan, P. Mohanan and K. Vasudevan, “CPW-fed Koch fractal slot antenna for WLAN/WiMAX application,” IEEE Antennas Wirel. Propag. Lett., vol. 7, pp. 389–392, 2008.
[7] M.-J. Chiang, T.-F. Hung, J.-Y. Sze and S.-S. Bor. “Miniaturized dual-band CPW-fed annular slot antenna design with arc-sharped tuning stub, ” IEEE Trans. Antennas Propag., vol. 58, no. 11, pp. 3710–3715, Nov. 2010.
[8] S.-W. Chen, D.-Y. Wang, and W.-H. Tu. “Dual-band/tri-band/broadband CPW-fed stepped-impedance slot dipole antennas,” IEEE Trans. Antennas and Propag., vol. 62, no. 1, pp. 485–490, Jan. 2014.
[9] S.-Y. Chen, Y.-C. Chen and P. Hsu. “CPW-fed aperture-coupled slot dipole antenna for tri-band operation,” IEEE Antennas Wirel. Propag. Lett., vol. 7, pp. 535–537, 2008.
[10] W.-H. Tu. “Compact harmonic-suppressed coplanar waveguide-fed in-ductively coupled slot antenna,” IEEE Antennas Wirel. Propag. Lett., vol. 7, pp. 543–545, 2008.
[11] W.-H. Tu and K. Chang. “Miniaturized CPW-fed slot antenna using stepped impedance resonator,” in Proc. IEEE Int. AP-S Symp., Washington, DC, Jul. 2005, vol. 4A, pp. 351–354. |