A Wideband Hybrid Water Antenna With an F-Shaped Monopole

L Xing,Q Xu,Y Huang,Saqer Alja'Afreh

doi:10.1109/access.2015.2461443

L Xing, Q Xu + Show 2 more

Open Access

https://doi.org/10.1109/access.2015.2461443

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Abstract

A new wideband hybrid antenna is proposed in this paper. It combines an F-shaped conducting monopole antenna and a water dielectric resonator antenna (DRA) to effectively broaden the antenna bandwidth. The F-shaped monopole is also used to excite the water DRA. The unique features of water, such as transparency and liquidity, allow complex feeding structures to be placed, and tuned inside the water DRA. A comprehensive parametric study is conducted to optimize the antenna performance. The final design is made and tested. A good agreement is obtained between the simulation and the measurement results. Compared with the conventional straight probe, the proposed antenna has a wider bandwidth from 410 to 870 MHz (a fractional bandwidth of 71.8%) for $\text{S}_{11} dB, with a compact size (52 mm $\times $ 51.5 mm $\times $ 10 mm, roughly $0.071\lambda \times 0.07\lambda \times 0.0136\lambda $ at 410 MHz). It is shown that this new antenna is a very good candidate for hand-portable applications such as Digital Video Broadcasting-Handheld.

Highlights

Water antennas, a special case of liquid antennas, are a new type of antennas which have attracted increasing attentions in recent years [1]–[5]
When it is used as a dielectric resonator antenna (DRA), the antenna size can be reduced by a factor of √εr ; c) conformability - it is easy to make the antenna to the desired shape; d) reconfigurability - the operational frequency and bandwidth may be controlled by the height and width of the liquid stream as well as the chemical composition; e) a small RCS - it can be drained when not in use; f) easy to transport - especially for a large antenna and g) transparency
An F-shaped conducting probe placed inside the water has been designed to efficiently excite the water DRA and work as a radiating element

Summary

Introduction

A special case of liquid antennas, are a new type of antennas which have attracted increasing attentions in recent years [1]–[5]. They have attractive features such as: a) low-cost and readily accessible; b) compact size - water is a kind of high permittivity material When it is used as a DRA, the antenna size can be reduced by a factor of √εr ; c) conformability - it is easy to make the antenna to the desired shape; d) reconfigurability (physically, electrically and chemically) - the operational frequency and bandwidth may be controlled by the height and width of the liquid stream as well as the chemical composition; e) a small RCS (radar cross section) - it can be drained when not in use; f) easy to transport - especially for a large antenna and g) transparency. In [6], water was used as the periodic grating to realize a reconfigurable radiation pattern

Methods

Results

Conclusion