2.4 GHz circular-polarization LNA receiving-type and PA transmitting-type active patch antennas for ISM band wireless communications

S. Y. Lin, H. R. Chuang

Research output: Contribution to journalArticle

Abstract

This paper presents the design, implementation, and measurement of amplifier-type circular-polarization (CP) active patch antennas for 2.4 GHz ISM-band wireless communication applications. The RF amplifier can be a low-noise amplifier (LNA) (23-dB gain and 2.8-dB noise figure) for receiving or a power amplifier (PA) (about 20-dB gain and 20-dBm output power) for transmitting at 2.4 GHz ISM-band. Using a Lange-coupler for two orthogonal feeds creates a 2.4 GHz circular-polarized square patch antenna. The spectral-domain electric field integral equation (SD-EFIE) technique is employed to accurately determine the patch antenna dimension, the antenna input SWR, current distribution, and radiation patterns. Finally, the semi-balanced amplifiers (by using PAs or LNAs) are designed and integrated with the patch antenna to form a transmitting or receiving type circularly-polarized active microstrip antenna. The patch-antenna/amplifier modules are fabricated on two FR-4 substrates with the ground planes soldered together. Compared with the stand-alone patch antenna, the combined patch-antenna/amplifier module has a much wider bandwidth. Potential applications of CP active patch antennas include base station antennas of ISM-band cordless telephones or wireless local area networks (WLAN).

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalJournal of the Chinese Institute of Electrical Engineering, Transactions of the Chinese Institute of Engineers, Series E/Chung KuoTien Chi Kung Chieng Hsueh K'an
Volume5
Issue number2
Publication statusPublished - 1998 May 1

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Circular polarization
Low noise amplifiers
Microstrip antennas
Power amplifiers
Communication
Cordless telephones
Antennas
Antenna feeders
Noise figure
Directional patterns (antenna)
Wireless local area networks (WLAN)
Base stations
Integral equations
Electric fields
Bandwidth

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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abstract = "This paper presents the design, implementation, and measurement of amplifier-type circular-polarization (CP) active patch antennas for 2.4 GHz ISM-band wireless communication applications. The RF amplifier can be a low-noise amplifier (LNA) (23-dB gain and 2.8-dB noise figure) for receiving or a power amplifier (PA) (about 20-dB gain and 20-dBm output power) for transmitting at 2.4 GHz ISM-band. Using a Lange-coupler for two orthogonal feeds creates a 2.4 GHz circular-polarized square patch antenna. The spectral-domain electric field integral equation (SD-EFIE) technique is employed to accurately determine the patch antenna dimension, the antenna input SWR, current distribution, and radiation patterns. Finally, the semi-balanced amplifiers (by using PAs or LNAs) are designed and integrated with the patch antenna to form a transmitting or receiving type circularly-polarized active microstrip antenna. The patch-antenna/amplifier modules are fabricated on two FR-4 substrates with the ground planes soldered together. Compared with the stand-alone patch antenna, the combined patch-antenna/amplifier module has a much wider bandwidth. Potential applications of CP active patch antennas include base station antennas of ISM-band cordless telephones or wireless local area networks (WLAN).",
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