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Showing papers on "Front-to-back ratio published in 2012"


Journal ArticleDOI
TL;DR: In this paper, a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented, where two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity are two different combinations of the and resonances.
Abstract: A bandwidth enhanced method of a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented in this paper. Bandwidth enhancement is achieved by simultaneously exciting two hybrid modes in the SIW-backed cavity and merging them within the required frequency range. These two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity, are two different combinations of the and resonances. This design method has been validated by experiments. Compared with those of a previously presented SIW cavity-backed slot antenna, fractional impedance bandwidth of the proposed antenna is enhanced from 1.4% to 6.3%, its gain and radiation efficiency are also slightly improved to 6.0 dBi and 90%, and its SIW cavity size is reduced about 30%. The proposed antenna exhibits low cross polarization level and high front to back ratio. It still retains advantages of low-profile, low fabrication cost, and easy integration with planar circuits.

254 citations


Proceedings ArticleDOI
06 Mar 2012
TL;DR: In this paper, an optimization methodology for a 60 GHz triangular monopole antenna-on-chip (AOC), designed using a standard 0.18 µm CMOS process and optimized over a Jerusalem Cross Artificial Magnetic Conductor (JC-AMC), is presented.
Abstract: This paper presents an optimization methodology for a 60 GHz triangular monopole Antenna-on-Chip (AOC), designed using a standard 0.18 µm CMOS process and optimized over a Jerusalem Cross Artificial Magnetic Conductor (JC-AMC). The JC-AMC acts as a shield between the AOC and the lossy CMOS substrate. Different configurations of JC-AMC cells are tested to acquire best AOC performance. It has been found that increasing the number of JC-AMC cells in the feeding direction and decreasing its number of cells in the direction perpendicular to the feed can improve the antenna characteristics in terms of gain, efficiency, front-to-back ratio, and small area.

15 citations


Journal ArticleDOI
TL;DR: Dielectric resonator antenna (DRA) mounted on cylindrical ground plane is investigated for handheld RFID reader applications at 5.8 GHz and the radiation characteristics of the antenna in free space and in the presence of a proposed compact reader device model and human hand are calculated.
Abstract: Dielectric resonator antenna (DRA) mounted on cylindrical ground plane is investigated for handheld RFID reader applications at 5.8 GHz. The simplicity of the structure makes it practical in terms of cost, space, and ease of fabrication. The radiation characteristics of the antenna in free space and in the presence of a proposed compact reader device model and human hand are calculated. The antenna is circularly polarized and exhibits peak gain of 7.62 dB at 5.8 GHz with high front to back ratio of 15.5 dB. Using the same reader device model, a sequentially feeding 2×2 DRA array mounted on the same cylindrical ground plane is used for RFID reader antenna at 5.8 GHz. The array introduces high gain of 9.36 dB at 5.8 GHz with high front to back ratio of 10.48 dB. The 2×2 DRA array elements exhibit circular polarization over a frequency band of 1.1 GHz. The axial ratio is 1.1 dB at 5.8 GHz. The proposed reader model is simple and has a small size compared with that in the case of planar ground plane. The results are calculated using the finite element method (FEM) and compared with that calculated using the finite integral technique (FIT).

4 citations


Journal ArticleDOI
Hong-Min Lee1
TL;DR: In this paper, the back radiation of the microstrip patch antenna is reduced by removing some metallic parts around the ground plane and placing a new soft-surface configuration, consisting of an array of stand-up split-ring resonators on a bare dielectric substrate near the two ground plane edges.
Abstract: This study presents a new, simple method for improving the front-to-back (F/B) ratio of a microstrip patch antenna. The back radiation of the microstrip patch antenna is reduced by removing some metallic parts around the ground plane and placing a new soft-surface configuration, consisting of an array of stand-up split-ring resonators on a bare dielectric substrate near the two ground plane edges. Compared to the F/B ratio of a conventional microstrip patch antenna with a full ground plane of the same size, our proposed microstrip patch antenna experimentally achieves an improved F/B ratio of 9.6 dB.

3 citations