Proceedings ArticleDOI
Design of an Ultrawideband Directional Antenna Based on a Bidirectional Radiator and a Multilayer Pyramid Absorber
Thipamas Phakaew,Suramate Chalermwisutkul,Kamol Kaemarungsi,Wanwisa Thaiwirot +3 more
- pp 129-133
TLDR
An antenna with a unidirectional radiation pattern for level sensing in a storage tank is presented in this article, which consists of a bidirectional radiator and a multilayer absorber.Abstract:
An antenna with a unidirectional radiation pattern for level sensing in a storage tank is presented. The proposed antenna configuration consists of a bidirectional radiator and a multilayer absorber. The frequency of operation ranges from 300 to over 1500 MHz with a reflection coefficient of less than −10 dB. By placing the multilayer absorber behind the bidirectional radiator, a stable unidirectional radiation pattern over the frequency range from 300 MHz to 900 MHz can be achieved. The absorber with 3 layers forms a pyramidal shape to absorb the signal at 3 difference frequency ranges namely around 300 MHz, 600 MHz and 900 MHz. This multilayer absorber is used to improve radiation pattern of the slot antenna by absorbing and reflecting the back lobe over the frequency of interest. The front to back ratio has a maximum value of 9.8 dB at 800 MHz.read more
Citations
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Proceedings ArticleDOI
Design of Ultra-Wideband Inverted U-Shaped Slot Antenna with Reflector for GPR Applications
TL;DR: In this article , the inverted U-shaped slot of the original slot antenna is modified by adding the wide rectangular slot, and small rectangular slots based on defected ground structure (DGS) are etched on the bottom edge of the radiating slot to improve impedance matching, especially at lower frequencies.
References
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Journal ArticleDOI
A constant gain ultra-wideband antenna with a multi-layer frequency selective surface
TL;DR: In this paper, an ultra wideband (UWB) antenna with a multi-layer frequency selective surface (FSS) reflector is presented, and a significant enhancement in the gain has been achieved in a low profile design while maintaining the excellent impedance bandwidth of the UWB antenna.
Journal ArticleDOI
Design of Multiplate Back-Reflector for a Wideband Slot Antenna
TL;DR: In this article, a multi-plate back-reflector widebandwidth unidirectional slot antenna is presented, which not only maintains the wideband nature of slot structure, but also exhibits stable antenna gain and better front-to-back (F/B) ratio over the frequency band of interest.
Proceedings ArticleDOI
Design of constant gain UWB planar antenna using single-layer FSS
Rabia Yahya,Makoto Itami +1 more
TL;DR: In this article, the authors proposed a UWB CPW-circular disc antenna installed above single-layer FSS, which has a constant gain from 2.5dB at lower frequency and 7dB at higher frequency to average 9dB with maximum variation of 0.5 dB across the entire UWB band.
Proceedings ArticleDOI
Microwave absorber materials characterization: bulk absorbing and electrical/magnetic parameters
TL;DR: In this article, the authors deal with Brazilian and international manufactured, low cost absorbing materials, characterized in both bulk format (damping) as well as its material parameters (electrical permittivity and magnetic permeability).
Proceedings ArticleDOI
Radiation characteristics of corner reflector antenna employing frequency selective surface
TL;DR: In this article, the half-power-beamwidth (HPBW) and front-to-back ratio (FB) characteristics of a corner reflector antenna employing frequency selective surface (FSS) were investigated.