A Compact Frequency Reconfigurable Hybrid DRA for LTEWimax Applications

Abstract EN

A compact hybrid antenna structure with frequency reconfiguration capabilities is presented in this article.

The proposed design employs a combination of a rectangular DR element and a coupling slot on the structure’s ground plane (GP).

The slot shifts the fundamental DRA mode by introducing a slow wave effect and its resonant behavior helps to achieve an omnidirectional pattern at low frequencies.

The slot is loaded with a series of PIN diode switches whose ON/OFF combinations alter the effective slot length.

Slot loading with PIN diodes results in frequency reconfiguration of the proposed structure with a large tuning range of 76.2% (between 1.73 and 3.86 GHz).

A parametric analysis was performed to investigate the effects of slot length, width, and position on the reflection coefficients of the proposed structure.

A prototype of the proposed design was fabricated and results were measured.

The measured results show a close agreement with the simulated ones.

The proposed design is suitable for DCS 1800 MHz, PCS 1900 MHZ, UMTS, LTE 2500–2700 MHz, and Wimax 3.5 GHz.