Design of a High Gain Dual Frequency Butterfly Dipole Antenna

In this paper, a high-gain dual-frequency butterfly dipole antenna is designed. The antenna adopts the shape of a butterfly dipole, which plays a role in expanding the bandwidth of the antenna. Two pairs of butterfly patches with different sizes realize the dual-band characteristics of the antenna, and the form of binary array is used to improve the gain of the antenna., the feeding method adopts 50 ohm coaxial feeding. The designed antenna is processed into a fabricated prototype and tested. The results show that the antenna can work well in two frequency bands of 2.4–2.5GHz and 5.15–5.85GHz. When the antenna works at lower frequency, the return loss is less than −10dB, and the maximum gain can reach 9dBi; when it works at higher frequency, the return loss of the antenna is less than 10dB, and the maximum gain can reach 7dBi. The antenna has the advantages of low cost, small size, simple structure, easy integration with microwave circuits, etc., and can be applied to wireless communication fields such as WLAN, RFID, WiMax, and LTE.