| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 102 === In this thesis, two types of improvement on Composite Right/Left Handed transmission line short-ended zeroth-order resonant antenna are presented. First unit cell of antenna combines high impedance transmission with interdigital structure so as to reduce the antenna area. The second antenna using short-ended theory and lumped elements relation with Q factor to design the Q factor of unit cell lower so as to increase the antenna bandwidth.
The first and two chapters introduce the applications, operation principle and theory of CRLH-TLs and ZOR. In the third chapter, miniaturized CRLH-TLs short-ended ZOR antenna is presented. The unit cell of antenna combines high impedance transmission with interdigital structure, the unit cell has higher series capacitor and inductor and lower resonant frequency so as to reduce the antenna area. After fabricating this circuit on Rogers 5880 of 62mils, bandwidth of return loss and radiation pattern peak gain are measured 3.6% and 1.24 dBi which have good agreement.
In the fourth chapter, short-ended bandwidth-enhanced ZOR antenna is presented. Using higher series capacitor and lower series inductor to decrease the Q factor so as to increasing the bandwidth. Meanwhile, research the relation between the length and number of interdigital capacitor and bandwidth of antenna to design the antenna in the best performance way. After fabricating this circuit on Rogers 5880 of 62mils, bandwidth of return loss and radiation pattern peak gain are measured 15.1% and 1.62 dBi.
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