Abstract
This paper initially presents an overview of different miniaturization techniques used for size reduction of printed log-periodic dipole array (PLPDA) antennas, and then continues by presenting a design of a conventional PLPDA design that operates from 0.7–8 GHz and achieves a realized gain of around 5.5 dBi in most of its bandwidth. This antenna design is then used as a baseline model to implement a novel technique to extend the low-frequency response. This is completed by replacing the longest straight dipole with a triangular-shaped dipole and by optimizing the four longest dipoles of the antenna using the Trust Region Framework algorithm in CST. The improved antenna with extended low-frequency response operates from 0.4 GHz to 8 GHz with a slightly reduced gain at the lower frequencies.
Highlights
With the rapid technological advancements over the last decade, there is an increased demand for new generation wireless devices and communication systems
Due to the fact that LPDAs can operate in a wide frequency range and provide flat gain and highly directive radiation patterns, they are a promising candidate for applications such as UWB communication systems, DF, Electromagnetic Compatibility (EMC), and radars
This paper investigates several miniaturization techniques that have been proposed by researchers and proposes a novel design of an extended low-frequency response printed log-periodic dipole array (PLPDA) that operates from 0.4 GHz to 8 GHz
Summary
With the rapid technological advancements over the last decade, there is an increased demand for new generation wireless devices and communication systems. The size of these antennas can be large, depending on the lowest operating frequency For such applications, wideband LPDAs (Log-Periodic Dipole Arrays) are highly preferred because they are directive and provide flat gain, wide bandwidth, and can be fabricated at a low cost [9,10,11]. They radiate in the end-fire direction and provide closely spaced multiple resonances in the operating frequency range. Due to the fact that LPDAs can operate in a wide frequency range and provide flat gain and highly directive radiation patterns, they are a promising candidate for applications such as UWB communication systems, DF, EMC, and radars. This paper investigates several miniaturization techniques that have been proposed by researchers and proposes a novel design of an extended low-frequency response PLPDA that operates from 0.4 GHz to 8 GHz
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