Thesis
High isolation and high gain microstrip antenna system for wideband in-band full-duplex communications
Washington State University
Master of Science (MS), Washington State University
05/2021
DOI:
https://doi.org/10.7273/000004258
Handle:
https://hdl.handle.net/2376/125257
Abstract
As the wireless communication devices are becoming more numerous, the available radio wave spectrum is becoming increasingly congested due to the traditional data transmission practices such as frequency- and time-division multiplexing. These methods require transmission (TX) and reception (RX) at either different frequencies or at different times decreasing the spectral efficiency. Researchers are exploring new wireless spectrum standards to address over crowded spectrum. One of these standards is full-duplex communications which allows for transmitting and receiving on the same frequency at the same time. In recent years, this technology has been broadly investigated and proved its significant role in various aspects of the technological advancements. In this thesis, three different two-port microstrip antenna system designs are proposed with high isolation between transmission and reception ports for simultaneous transmit and receive (STAR) applications, also known as full-duplex wireless communications. The first design contains two antenna pairs, each of which is composed of two identical single-ended microstrip patch antennas operating at 12 GHz. Each element in this array is fed 180° out-of-phase by utilizing rat-race hybrid couplers making the whole system differential-fed. The second design proposes a dual polarized antenna array, which comprises two arrays. Each of which is composed of four identical single-ended microstrip rectangular patch antenna operating at 12 GHz. The corporate feeding technique is used to feed the first array, while the second array is fed using the series-fed method. The last design is a differentially driven log-periodic dipole array (LPDA) system. This antenna system is comprised of two pairs of LPDAs operating in the X-band spectrum from 8 GHz to 12 GHz. Simulation results of three designs show large isolation S21 < – 45 dB through the entire band of interest while measured results approach S21 < – 40 dB in a reflective environment. Moreover, the measured results are in good agreement with simulations achieving high isolation bandwidth. These proposed systems offer low cross-polarization between E-plane and H-plane. They also exhibit good impedance matching, reasonable gain values, high efficiency, which has common applications in radar, weather monitoring, air traffic control, or satellite communications.
Metrics
4 File views/ downloads
53 Record Views
Details
- Title
- High isolation and high gain microstrip antenna system for wideband in-band full-duplex communications
- Creators
- Tuan Thanh Nguyen
- Contributors
- Tutku Karacolak (Advisor) - Washington State University, Engineering and Computer Science (VANC), School of
- Awarding Institution
- Washington State University
- Academic Unit
- Engineering and Computer Science (VANC), School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Identifiers
- 99900896416601842
- Language
- English
- Resource Type
- Thesis