# A Monopole UWB Antenna for WIFI 7/Bluetooth and Satellite Communication
## 1 Introduction
They used the embedded microstrip feeder structure to make the radiation patch perfectly match the load impedance. In Ref. [20], a J-slot-based radiator was proposed for WiFi, Wi-MAX, LTE, and C/X/Ku-band coverage, through an embedded feeder structure. Ref. [21] proposed a metamaterial-based radiator model that generated two resonance modes, achieved by etching an L-shaped slot in the radiator. In addition, branches were added on the ground to form a coupling with the radiator, which then generated a new resonance at 2.4 GHz. Refs. [22; 23] realized a frequency-reconfigurable multi-frequency broadband antenna by using the diodes. Specifically, Ref. [22] studied a linear dual-polarized slot ring array antenna, where four of the diodes were arranged at equal angles for efficient switchable multi-band UWB antennas. Ref. [23] used Roger 3006 as the substrate and then used three diodes to connect five metamaterial units with the radiator to realize a dual-band broad-band antenna with low VSWR. Ref. [24] proposed a new combined Koch and Sierpinski fractal antenna, which achieved 2G/3G/4G/5G/WLAN and navigation band coverage by etching multiple triangular slots on the radiator. However, its structure was very complex and difficult to process. Ref. [25] used a carbon nanotube composite material to realize the application of a broadband millimeter wave antenna at 24-34 GHz. The antenna used a T-shaped structure as a feed network, analyzed the binary carbon nanotube antenna array, and demonstrated that the composite material outperformed copper in terms of S-parameters and efficiency. In Ref. [26], a composite material of EVA polymer and carbon mixture was used instead of a copper layer, and by optimizing the thickness of EVA and the state of carbon particles, the results showed that the radiator material used in the UWB band had better return loss performance than using copper. However, its production steps are cumbersome and require precise control of the mixture ratio. In this paper, we propose a simple tri-band high-gain monopole UWB antenna based on an FR-4 substrate. The antenna consists of a rectangular ground, a feeder line, a modified short-sleeve-shaped patch, and a symmetrical L-shaped patch. To cover multiple frequency bands, slots were cut in the short-sleeve, and the edges were cut off. The introduced gradient structure at the strong current effectively stimulates the required working radiation mode, so that the resonant mode of the antenna transitions relatively smoothly from a resonance point to another resonance point; opening a U-shaped slot on the feeder and adding symmetrical L-shaped patches on both sides of the feeder can extend the radiation current path, thereby reducing the return loss and improving the impedance-matching performance of the antenna. The antenna proposed in this paper is small in size and low in production cost. The simulation results using HFSS software show that the antenna with a symmetrical structure can cover WiFi 7, Bluetooth, 4G/5G, and some satellite communication bands with relatively good gain. The rest of this paper is organized as follows: Section 2 displays the proposed antenna and discusses the design evolution of the proposed antenna. Section 3 presents a parametric analysis, and Section 4 presents the current distribution of the antenna at resonance modes. Next, Section 5 shows the S-parameter results and far-field characteristics. Finally, the conclusions are given in Section 6.