International Journal of Electrical and Computer Engineering (IJECE)
This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization... more This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization states from linear to circular polarization in real-time by means of a PIN diode. An antenna is fed by a 50 Ω coaxial cable through the substrate of Teflon with relative permittivity of 2.15. The proposed antenna possesses a simple patch with a one-sided corner truncated to achieve polarization reconfigurability. A PIN diode is loaded to connect the main patch with a truncated corner and further maintain dual polarization states such as linear polarization (LP) and circular polarization (CP). Advanced design system (ADS) was used as a simulator to simulate the antenna, and a good understanding was obtained between simulated and measured results. Measured results showed a good agreement with simulated results at all working frequencies of interest. It shows minimum reflection coefficient gain with -10 dB scattering bandwidth 100 MHz for LP states and 170 MHz for CP states. It also shows ...
International Journal of Electrical and Computer Engineering (IJECE)
In this article, a frequency reconfigurable honey-bee compact microstrip monopole antenna is prop... more In this article, a frequency reconfigurable honey-bee compact microstrip monopole antenna is proposed which is fed by a microstrip line (50 Ω) having the capability of providing dual-band as well as triple-band operation in eight distinct modes. By embedding three PIN diodes overs the honey bee arms, the effective current distribution is controlled hence resonant frequency is also changed in eight distinct modes in real-time. This is the reason the proposed antenna is portrayed as a frequency reconfigurable antenna in this paper which is suitable for cognitive radio application. This proposed antenna can be used for various wireless application such as Bluetooth, Wi-Fi, worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN), C-band, and X-band applications. The proposed antenna possesses a planner geometry of 39×34×0.87 mm3 which is printed on a substrate as flexible FR-4 (lossy) (εr=4.4 and tanδ=0.019). The proposed antenna exhibits voltage stan...
This paper describes quasi-millimeter wave band wireless access systems for high-capacity broadba... more This paper describes quasi-millimeter wave band wireless access systems for high-capacity broadband wireless communications. The 25and 27-GHz bands have been allocated for nomadic wireless access systems in Japan to increase their system capacity and provide a transmission rate higher than 100 Mbit/s. After describing the application areas and regulatory requirements of the 25/27-GHz-band systems, we examine the experimental transmission performance of 25-GHz systems based on orthogonal frequency division multiplexing (OFDM). The issues to be resolved before 25/27-GHz-band systems become feasible are also discussed. Broadband Wireless Access Technologies Using the Quasi-Millimeter Wave Band † NTT Network Innovation Laboratories Yokosuka-shi, 239-0847 Japan E-mail: toyoda.ichihiko@lab.ntt.co.jp
International Journal of Electrical and Computer Engineering (IJECE)
This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization... more This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization states from linear to circular polarization in real-time by means of a PIN diode. An antenna is fed by a 50 Ω coaxial cable through the substrate of Teflon with relative permittivity of 2.15. The proposed antenna possesses a simple patch with a one-sided corner truncated to achieve polarization reconfigurability. A PIN diode is loaded to connect the main patch with a truncated corner and further maintain dual polarization states such as linear polarization (LP) and circular polarization (CP). Advanced design system (ADS) was used as a simulator to simulate the antenna, and a good understanding was obtained between simulated and measured results. Measured results showed a good agreement with simulated results at all working frequencies of interest. It shows minimum reflection coefficient gain with -10 dB scattering bandwidth 100 MHz for LP states and 170 MHz for CP states. It also shows ...
International Journal of Electrical and Computer Engineering (IJECE)
In this article, a frequency reconfigurable honey-bee compact microstrip monopole antenna is prop... more In this article, a frequency reconfigurable honey-bee compact microstrip monopole antenna is proposed which is fed by a microstrip line (50 Ω) having the capability of providing dual-band as well as triple-band operation in eight distinct modes. By embedding three PIN diodes overs the honey bee arms, the effective current distribution is controlled hence resonant frequency is also changed in eight distinct modes in real-time. This is the reason the proposed antenna is portrayed as a frequency reconfigurable antenna in this paper which is suitable for cognitive radio application. This proposed antenna can be used for various wireless application such as Bluetooth, Wi-Fi, worldwide interoperability for microwave access (WiMAX), wireless local area network (WLAN), C-band, and X-band applications. The proposed antenna possesses a planner geometry of 39×34×0.87 mm3 which is printed on a substrate as flexible FR-4 (lossy) (εr=4.4 and tanδ=0.019). The proposed antenna exhibits voltage stan...
This paper describes quasi-millimeter wave band wireless access systems for high-capacity broadba... more This paper describes quasi-millimeter wave band wireless access systems for high-capacity broadband wireless communications. The 25and 27-GHz bands have been allocated for nomadic wireless access systems in Japan to increase their system capacity and provide a transmission rate higher than 100 Mbit/s. After describing the application areas and regulatory requirements of the 25/27-GHz-band systems, we examine the experimental transmission performance of 25-GHz systems based on orthogonal frequency division multiplexing (OFDM). The issues to be resolved before 25/27-GHz-band systems become feasible are also discussed. Broadband Wireless Access Technologies Using the Quasi-Millimeter Wave Band † NTT Network Innovation Laboratories Yokosuka-shi, 239-0847 Japan E-mail: toyoda.ichihiko@lab.ntt.co.jp
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