Abstract
Theoretical study of a narrow-strip broadband microstrip antenna with L-probe fed is presented in this paper. In order to realize narrow-strip antenna structure (the width is less than 0.22λ), the L-probe is designed at the width side of the rectangle radiating patch. Equivalent transmission line model is then used to analysis the two resonant frequencies which result in a broadband property (-10dB impedance bandwidth of 32%). It is found that for the L-probe fed miscrostrip antenna with relatively high air layer (0.1λ), the termination capacitance of the patch is negligible and the effective dielectric constant is approximate to that of the air. In addition, a simple approximate scheme is proposed to further estimate the lower resonant frequency accurately. Simulated and measured results are carried out to verify the theoretical analysis.
Highlights
Microstrip antenna has been widely used in wireless communication system due to its advantages of high precision and low cost [1], [2]
When the design space of the antenna is narrow-strip with coaxial fed, to achieve broadband directional radiation and low cross-polarization, a promising way is to adjust the structure of the broadband directional antenna to be narrow-strip
Inspired by the broadband microstrip antenna with traditional L-probe coupling fed [12], the L-probe is designed at the width side of the patch to excite the TM10 mode in this paper
Summary
Microstrip antenna has been widely used in wireless communication system due to its advantages of high precision and low cost [1], [2]. Way to tune the high inductance of the probe is to introduce capacitive effect into the feed structure, such as the L-probe coupled feed antenna [11]–[23] and the short probe pin with a smooth conducting transmission [24], [25]. The L-probe and its deformation structure have been established and demonstrated extensively in the literature this technology long back, fewer works focused on the associated dual resonance property and the effect of substrate [12]–[23]. Inspired by the broadband microstrip antenna with traditional L-probe coupling fed [12], the L-probe is designed at the width side of the patch to excite the TM10 mode in this paper.
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