Compact, Frequency Reconfigurable, Printed Monopole Antenna

Ricardo Gonçalves,Pedro Pinho,Nuno B Carvalho

doi:10.1155/2012/602780

Ricardo Gonçalves, Pedro Pinho + Show 1 more

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https://doi.org/10.1155/2012/602780

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Abstract

This paper proposes a possible implementation of a compact printed monopole antenna, useful to operate in UMTS and WLAN bands. In order to accomplish that, a miniaturization technique based on the application of chip inductors is used in conjunction with frequency reconfiguration capability. The chip inductors change the impedance response of the monopole, allowing to reduce the resonant frequency. In order to be able to operate the antenna in these two different frequencies, an antenna reconfiguration technique based on PIN diodes is applied. This procedure allows the change of the active form of the antenna leading to a shift in the resonant frequency. The prototype measurements show good agreement with the simulation results.

Highlights

Antenna miniaturization is the result of the continuous search for smaller and compact electronic equipment that can present the same or even better performance.There are many examples of techniques used for antenna miniaturization for different applications
This paper proposes a possible implementation of a compact printed monopole antenna, useful to operate in UMTS and WLAN bands
The aim of this paper is to present a compact reconfigurable monopole antenna suitable to operate in the WLAN (2.4 GHz) and UMTS (2.0 GHz) bands using chip inductors and PIN diodes

Summary

Introduction

Antenna miniaturization is the result of the continuous search for smaller and compact electronic equipment that can present the same or even better performance.There are many examples of techniques used for antenna miniaturization for different applications. An approach is presented in [1], where a metamaterial is used between the radiating element and the ground plane of a printed circular patch, in order to reduce its resonant frequency Another example is presented in [2], where a Koch fractal printed monopole is used to resonate at 2.5 GHz, granting a 21% reduction in size. In [3, 4], chip inductors are used in order to reduce the resonant frequency of printed C-monopoles, without changing the size and radiation characteristics and with minor losses to the radiating efficiency and gain This is an interesting approach, since it is quite simple to fabricate, and it is not expensive.

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