# Design of a Dual-Band Broadband Antenna Based on Structure Reuse

## TL;DR

This paper introduces a new dual-band broadband antenna that uses structure reuse to reduce complexity and improve performance.

## Contribution

The novelty lies in reusing the slot antenna as both a radiating element and a feeding structure.

## Key findings

- The low-frequency band achieves a 22.1% relative bandwidth and 6.5 dBi peak gain.
- The high-frequency band reaches a 13.6% relative bandwidth and 4.6 dBi peak gain.

## Abstract

In this paper, a novel dual-band broadband antenna based on structure reuse is proposed. The proposed antenna integrates a slot antenna with a microstrip antenna to achieve dual-band performance. The slot antenna innovatively serves as both a radiating element and a feeding structure for the microstrip antenna, realizing structure reuse and significantly reducing structural complexity. To enhance the dual-band bandwidth, four symmetrically arranged parasitic strips are introduced, effectively extending the low-frequency bandwidth. Additionally, the high-frequency bandwidth is further improved by the introduction of a U-shaped slot. To analyze its working principle, the characteristics of the current and electric field distributions at each resonant point are given. The measured results indicate that in the low-frequency band, the proposed antenna achieves a relative bandwidth of 22.1% and a peak gain of 6.5 dBi. In the high-frequency band, it realizes a relative bandwidth of 13.6% and a peak gain of 4.6 dBi.