RADIATION PATTERN RECONFIGURABLE MICROSTRIP PATCH ANTENNA USING DUAL DELAY LINE
DOI:
https://doi.org/10.11113/jt.v80.10304Keywords:
Radiation pattern, reconfigurable, delay line, array, wireless, CSTAbstract
This paper proposes radiation reconfigurable patch antenna using feeding delay line technique. The 2 x 2 antenna array is designed and investigated. The direction of radiation pattern is newly controlled by interchanging two different lengths of corporate feeding network based on dedicated switches’ states of feeding line network. The size of radiating patches are remained minimum by introducing dumbbell slot structure that etched on the ground layer with dual functions, to couple the feeding network on the bottom substrate with radiating patches on the top substrate, and to get desired working frequency at 7.5 GHz. Three directions of radiation pattern are obtained from the proposed reconfigurable antenna according to states of OPEN and SHORT of feeding line network. From the antenna structure, the antenna beam is steerable towards three angles -30 degree, 0 degree and +30 degree. With return loss (S11) in range of -20 dB to -33 dB, the antenna successfully resonant at 7.5 GHz during OFF while 7.46 GHZ during ON condition. In addition, the directivity gain of the antenna almost consistent at three different directions in range of 9.67 dBi to 9.8 dBi. The results from fabricated antenna are agreed with simulated, and the antenna has potential to serve for outdoor wireless communication systems.Â
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