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A Novel Ultra-Wideband Monopole Antenna with Band-Stop Characteristic

Wireless Engineering and Technology 2011年第4期2卷 235-239页

作者： Hadi Jalali Lak changiz ghobadi Javad Nourinia 不详

In this letter, a simple monopole antenna with variable band-notched characteristic for ultra wide band (UWB) function is proposed. Two L-shaped quarter-waveguide resonators coupled to the ground plane with two shorting tracks at the sides of the antenna are used to generate stop-band performance around 5.5 GHz (WLAN). The proposed antenna is fabricated on the substrate FR4 (relative permittivity of 4.7) and has a compact size of 16 × 28.5 × 1.6 mm. The designed antenna has a good impedance matching in 3.1 - 11.4 GHz frequency range with VSWR < 2, except the band 5 - 5.85 GHz.

关键词： Band-Notched Antennas Band Rejection Antennas Planar Antennas Ultra Wideband (UWB)

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Aperture Efficiency Study of Square Reflect Array Antennas

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Wireless Engineering and Technology 2018年第3期9卷 66-78页

作者： Javad Nourinia changiz ghobadi Bahman Mohammadi Farzad Alizadeh Department of Electrical Engineering Urmia University Urmia Iran

This paper presents a detailed study of square reflect array (RA) antenna aperture efficiency (ηa). Effects of quantization-phase and limited phase-range errors on radiation pattern, half-power beam width (HPBW) and ηa for different feed locations are investigated. Results show an in-crease in side-lobe levels (SLLs) and a slightly reduction in ηa with quantization-phase augmentation or element phase-range reduction, however, the effects on HPBW are negligible. Nevertheless, the degradation in ηa is negligible when the quantization-phase is lower than 30° or phase-range is more than 300°. Parametric studies have been carried out to provide design guidelines to maximize ηa. It is perceived that the offset-angle plays an important role to determine ηa, especially for feed with narrow beam width.

关键词： Aperture Efficiency Limited Phase-Range Error Quantization-Phase Error Reflect array Antennas Square Aperture

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A Novel Approach in RF-MEMS Switch Analysis Using Time Domain TLM Method

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Journal of Electromagnetic Analysis and Applications 2011年第10期3卷 395-398页

作者： Alireza Haghshenas changiz ghobadi Javad Nourinia Davod Ahmadian Saber Soltani 不详

In this paper the transmission line matrix (TLM) method is exploited to evaluate the electromagnetic field distribution over a new radio frequency micro electromechanical system (RF-MEMS). A hybrid symmetrical condensed node is used to analyze S-parameters of the switch in on and off states. Furthermore, the effects of spring zigzag cuts over the bridge are analyzed. Results have authorized that TLM method offers a much faster and more reliable results compare to other numerical methods because of its time domain behavior and transmission line basis.

关键词： Transmission Line Matrix Micro Electromechanical System Switch Analyze

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A U-Shaped UWB Antenna with Band-Notched Performance

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Wireless Engineering and Technology 2013年第4期4卷 177-180页

作者： Aliakbar Hosseinzadeh Mirhamed Mirmozafari Mohammad Vatankhah Varnoosfaderani changiz ghobadi Javad Nourinia Department of Electronics and Communication Engineering Urmia University Urmia Iran

An ultra-wideband antenna with controllable band-notched is presented. Two semi-ellipses with different radiuses are subtracted to result in the main patch. By varying inner and outer radiuses, much more enhancement in bandwidth occurred. A U-shaped slot is used to make band-stop performance. Measured S11 is ≤-10 dB over 2.3 - 5 GHz and 6.1 - 15.1 GHz.

关键词： Ultra-Wideband Antenna (UWB) Slot Slit Band-Notched

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