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A New Type of Reconfigurable Antenna for Multi-Band Wireless Communications
Keywords: reconfigurable, multi-band, antenna
Recently, wireless communication technique is ubiquitous. It evolves from bulky machines into small gadgets. Furthermore, many different communication systems are desired to be integrated into a small area to satisfy the need of market trend. Based on this reason, we propose a new reconfigurable multi-band antenna. The antenna consists of one monopole antenna and four U-shaped (half-ringed) resonators. The resonators are coupled from the monopole antenna, instead of directly connecting to it. Two of U-shaped resonators are paired and placed in opposite (end-to-end) to form a broken (ring) circle as a subset, and located in one side of monopole antenna. In each subset, two P-I-N diodes connect the broken ends of U-shaped resonators to control the resonate characters. By using different ON or OFF states combination of the four PIN diodes, there are six effective resonating types to be created. If we further consider the effect of the distance between resonators and monopole antenna, three additional resonating types will occur. Therefore, we can get nine different resonating types from P-I-N diode combinations. The proposed antenna is designed on FR-4 printed-circuit-boards (PCB) ( Dk=4.3, Df=0.02, thickness=1.6mm), which is low-cost and allows ease of prototyping. The size of proposed antenna is 26.5 x 20.6 mm square. The simulation results show nine resonating types under the condition of VSWR=3:1 and frequency<4GHz, which can cover several standard wireless communication bands, including PCS/DCS/UMTS/3G/PHS/Bluetooth/WiFi 802.11b,g and WiMAX. The choice of communication systems is merely determined by the condition of the PIN diodes, which can simplify the design of antennas and the cost of fabrication. As a result, the proposed antenna with relatively low profile is very suitable for multi-band communication and multi-media systems.
Chang-Chih Liu, RF Design Engineer
Industrial Technology Research Institute
Chutung, Hsinchu, Taiwan 31040,

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