Browsing by Author "Deng, En"

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Novel Dual-Band Open-Ended Zeroth-Order Resonant Antenna
(2017-01-01)
Chi, Pei-Ling
;
Deng, En
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this paper, a dual-band open-ended zeroth-order resonant (ZOR) antenna is proposed. This ZOR antenna simply consists of one unit cell of the composite right/left-handed transmission structure and two sections of microstrip lines on both sides. Experimental results show that this open-circuited antenna is able to resonate at 2.37 GHz and 5.68 GHz with infinite-wavelength propagation; moreover, the fractional bandwidths of 0.77% and 2.45% and the peak gains of 1.19 dBi and 2.05 dBi were attained in the lower and higher bands, respectively. The antenna occupies a footprint of 0.122 lambda(0) x0.349 lambda(0), where lambda(0) is the free-space wavelength at 2.37 GHz.
Switchable Quadri-Polarization Slot Antenna Using a Single Feed Port
(2017-01-01)
Chi, Pei-Ling
;
Deng, En
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this paper, a switchable slot antenna with four polarization states excited by a single port is proposed. The slot radiator is coplanar with a coplanar waveguide, which is excited by a microstrip line on the other side of the substrate. To demonstrate polarization diversity and achieve impedance matching for each state, the PIN diodes were used as the switching elements to select the particular feeding structure and the associated matching network. Experimental results show that this antenna can exhibit right-handed and left-hand circular polarizations, vertical and horizontal (linear) polarizations with measured gains of 1.89 dBi, 2.51 dBi, 2.08 dBi, and 2.62 dBi, respectively. The 3-dB axial-ratio bandwidths for the right-hand and left-hand circular polarizations are 9% and 14.6%, respectively. Within the operating bands, good return losses are obtained.