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In this paper, a 2 by 1 array antenna for beam forming based on a feeding network composed of 2 low temperature cofired ceramic (LTCC) hybrid coupler, a 90 degree delay line and 4 Single-pole double-throw (SPDT) switch with 50 Ω termination is proposed. By combining these elements, the feeding network can operate as many kinds of power dividers such as Wilkinson power divider, quadrature hybrid coupler...
A novel helical reflector antenna is presented to cover the whole UHF RFID band (860~960 MHz). The proposed antenna has a ground reflector and is composed of two antenna layers which are connected by via to form a helical structure. The total length of the proposed antenna is 1~1.3 ?? to have the higher antenna impedance. And the antenna gain is increased by using a ground reflector. The size of the...
In this paper, a quadrifilar spiral antenna (QSA) with an integrated module for UHF radio frequency identification (RFID) reader is presented. The proposed QSA consists of four spiral antennas with short stubs and a microstrip feed network. Also, the shielded module is integrated on the center of the ground inside the proposed QSA. In order to match the proposed QSA with the integrated module, we...
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