Design and Modelling of a Coaxial Probe Fed Two-Port Dual-Band Antenna for Wireless Communication

Dr. Md. Masud Rana, Md. Ariful Islam

Abstract

This paper presents a dual-band antenna with coaxial probe feeding for wireless applications. The antenna consists of two spiral patches, resulting in a compact size of 27 × 14 × 1.6 mm3. Utilizing two spiral patch elements, the antenna can operate in two frequency bands, 241-641 MHz and 1.33-2.01 GHz, providing coverage for the medical implant communication service (MICS) band and the long (L) band. As a result, it comprises the versatility to be employed in biomedical applications as well as in mobile or satellite communications. This design offers improved return loss and higher bandwidths that are achieved by incorporating patch slots and shortening pins, representing a significant contribution to the field of wireless communication. The obtained return losses are -31.98 dB and -33.16 dB at the resonant frequencies of 459 MHz and 1.68 GHz, respectively. The gain values at these resonant frequencies are -45.6 dB and -18.2 dB.

Conclusion

A two-port coaxial probe fed spiral shaped dual-band antenna for wireless communication is introduced in this work. The proposed antenna is designed to operate at two different frequencies: 459 MHz, which is close to the MICS band, and 1.68 GHz, in the L band. It offers bandwidths of 416 MHz and 800 MHz for each resonant frequency, respectively. The antenna is made on an FR-4 substrate and consists of two symmetrical spiral elements, measuring 27 × 14 × 1.6 mm3 in total. The coaxial probe feeding technique is used for excitation. This antenna demonstrates low power loss because of the improved return losses, which are - 31.98 dB and - 33.16 dB at their respective resonant frequencies. Patch slots and shortening pins are incorporated in the spiral patches to improve their return loss and increase bandwidths, representing a significant contribution to the field of dual-band antenna design for wireless communication. Given the capability of the proposed antenna to operate within both the MICS band and L band, it possesses the versatility to be employed for applications in biomedical contexts, as well as in mobile or satellite communications. At the resonant frequencies, gains of - 45.6 dB and - 18.2 dB are finally realized with radiation efficiencies of -49.18 dB and -20.99 dB, respectively. Due to the limitations of resources and lab facilities, the proposed antenna could not be fabricated. Thus, the experimental results could not be obtained.

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