Abstract
This study proposes and designs a multiband branch antenna with a structure that imitates the Chinese classical pattern structure. The antenna radiator’s structure is a symmetrical rectangular stub fused with a Chinese classical pattern structure, and the rectangular stub is bent so that the outer and inner stubs are coupled to each other to generate multiple frequency bands. Microstrip line feeding is the feeding mode, and the grounding plate is a trapezoidal structure formed by subtracting two triangles from a rectangle. The overall size of the antenna is 60 × 60 × 1.6 mm3, and the dielectric board adopts FR4. The substrate dielectric constant εr = 4.4, the thickness h = 1.6 mm, and the dielectric loss tangent tanδ = 0.02. For antenna modeling and parameter optimization, HFSS electromagnetic simulation software is used. The antenna can cover 1.49 to 1.60 GHz, 1.87 to 2.51 GHz, and 4.63 to 5.34 GHz and generate three main frequencies: 1.57, 2.15, and 5.06 GHz, according to test result. The antenna has omnidirectional radiation characteristics and can be widely used in future mobile communication network coverage.
Highlights
Since the invention of the antenna, the antenna has played an increasingly important role in human social life
Parameter Optimization e main shape of the antenna is a rectangular stub, which incorporates a “回” pattern structure. e rectangular stub is bent into a “回” pattern structure, and a microstrip line structure is used for power feeding, bending the radiator and the electromagnetic coupling effect is primarily responsible for the multifrequency performance
At the 1.55 GHz frequency point, the frequency point did not move, and the return loss value changed from −18.9 dB to −21.9 dB. e −10 dB bandwidth at 2.4 GHz narrows. e bandwidth is reduced by 0.17 GHz from 1.76–2.56 GHz to 1.87–2.50 GHz. e antenna’s resonant frequency is nearly constant at 5.05 GHz; the return loss value has changed from −23.82 dB to −30.78 dB, and the bandwidth is relatively consistent
Summary
Since the invention of the antenna, the antenna has played an increasingly important role in human social life It is a vital radio device for transmitting and receiving electromagnetic waves, as well as an essential component of the radio communication system. E door and window patterns that can be used for antenna design are broadly classified as geometric patterns, tree and flower patterns, animal patterns, and so on Geometric patterns are those that use straight lines, curves, and shapes to create geometric patterns for decorations. It can be combined in many ways, including ice crack, step-by-step brocade, swastika pattern, set of square brocade, “回” pattern [4], and so on.
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