###### Abstract
The resulting antenna demonstrates remarkable performance across a broad frequency range, spanning from 26.5 GHz to 43.7 GHz. The proposed design incorporates stubs with loaded rectangular patches, strategically integrated to enhance impedance bandwidth and achieve ultra-wideband characteristics. To further enhance functionality, a MIMO antenna is created by combining multiple elements. The hardware prototypes of both the individual antenna element and its MIMO configuration are fabricated and tested. The measured results closely align with the simulated outcomes. [PERSON] et al. [7] present a new CPW-fed antenna specifically designed for UWB applications with a WLAN band notch. The antenna boasts a simple geometry, featuring a rectangular radiation element integrated with a Y-shaped resonator, which effectively enhances the impedance bandwidth over the frequency range of 3-14.55 GHz. To achieve rejection at 4.59-5.82 GHz, an additional stub is incorporated into the antenna's design. This feature enables the antenna to maintain constant radiations with a gain exceeding 2 dBi within the pass-band, while demonstrating a minimum gain of \(-\)3.9 dB in the notch band. The antenna's measurement results exhibit excellent agreement with the simulations, confirming the accuracy and effectiveness of the proposed design. [PERSON] et al. [8] propose a modified patch antenna with a notable design simplified by using air as the dielectric and a straightforward patch shape. Ensuring that the feeding pin rod connects to the patch to the microstrip line is critical, ensuring excellent impedance matching for maximum radiation at the resonance frequency. Operating at 2.4 GHz, the antenna achieves impressive performance metrics, including a 9.63 dBi gain and a 93.08% total efficiency. The antenna's advantages lie in its easy design and manufacturing process, absence of a dielectric, through-wire feeding technique, robustness, error tolerance, and the ability to achieve superior performance across all metrics simultaneously. [PERSON] et al. [9] analyze and discuss the fundamental properties, as well as signal propagation curves, of a single-tower umbrella antenna, which can be a suitable choice for enhancing Loran transmission. Detailed analysis and comparison of the radiation characteristics of the transmitting antenna along with simulations in the complex geographical environment of Tibet, China are discussed. The results demonstrate the advantages of using the single-tower antenna in Tibet, and led to the design of the transmitting antenna's structure and electrical parameters, resulting in the capability to extend the enhanced Loran signal transmission to 1000 km or even further. [PERSON] et al. [10] employ a microwave breast imaging model using nine identical Vivaldi antennas to detect cancer tumors in a multilayer model. The array's configuration involved one antenna as a transmitter, and the remaining eight as receivers, in order to measure the backscattering signal of the breast phantom. This process was repeated with each antenna taking turns as the transmitter. Various tumor sizes and locations were tested and, remarkably, the locations could be accurately determined regardless of the tumor size. The Vivaldi element used in the study features a compact size of 25 \(\times\) 20 mm\({}^{2}\), and a unique geometry. This antenna was fabricated and demonstrated excellent agreement between its simulated and measured performance. [PERSON] et al. [11] propose a straightforward and efficient design for an ultra-wideband (UWB) antenna, which takes the form of a jug shape with a handle on the right side of the radiator. This UWB antenna is printed on a cost-effective FR-4 substrate, making it suitable for wireless communication systems. The antenna's dimensions are 25 mm \(\times\) 22 mm \(\times\) 1.6 mm. The performance of the antenna is impressive, with a maximum gain of 4.1 dB, covering the entire UWB spectrum from 3 GHz to 11 GHz. The antenna's performances are investigated through simulations and measurements.