Abstract
This work proposes a novel multiband slotted planar antenna with a “回” structure, which is similar to an ancient Chinese window grille structure. The antenna is suitable for wireless applications, including the second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G) technologies, as well as WLAN and navigation applications. The proposed antenna is based on the structural characteristics of a conventional monopole antenna, which combines the advantages of a slit structure and microstrip line structure for feeding. It adopts a circular patch with a slit structure placed in it, which is similar to the Chinese classical pane structure. This structure enables an effective reduction of the size of the antenna. The four-sided “回” gaps change the path of current flow and are coupled to each other, improving the impedance matching and radiation characteristics of the entire target frequency band. The antenna covers the frequency ranges of 1.58–1.77 GHz (12%), 2.1–2.50 GHz (17%), 3.61–4.09 GHz (12%), and 4.75–6.5 GHz (36%), permitting more than 10 wireless applications in these 4 frequency bands. This antenna uses an FR-4 dielectric material; the relative dielectric constant of the dielectric plate is 4.4, and the actual dimensions of the antenna are 85 × 70 × 1.6 mm³. The test and simulation results are in good agreement with each other, thus confirming that the proposed design method meets the requirements of various wireless applications.
Highlights
With wireless applications becoming increasingly more popular, the requirements for antenna miniaturisation, multiple frequency bands, and ease of loading have grown considerably
In order to achieve multiple frequency bands, antennas are commonly designed with multiple feed points, and a U-shaped reflector is included at the bottom to expand the frequency band [1]
The square and circle antenna designs similar to ancient Chinese coins have been shown to exhibit good performance after a five-layer iteration [2]
Summary
With wireless applications becoming increasingly more popular, the requirements for antenna miniaturisation, multiple frequency bands, and ease of loading have grown considerably. Different feeding methods have been utilised: the microstrip line feeding performs well in terms of losses, the resulting frequency band is narrow [6,7,8]. Erefore, in order to design a miniaturised, low-profile multiband planar antenna that can be used for mobile terminals, it is necessary to combine patch slotting or fractal geometry with traditional antennas.
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