Improved patch antenna performance by using photonic bandgap substrates (original) (raw)
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Enhanced patch-antenna performance by suppressing surface waves using photonic-bandgap substrates
IEEE Transactions on Microwave Theory and Techniques, 1999
The microstrip patch antenna is a low-profile robust planar structure. A wide range of radiation patterns can be achieved with this type of antenna and, due to the ease of manufacture, is inexpensive compared with other types of antennas. However, patch-antenna designs have some limitations such as restricted bandwidth of operation, low gain, and a potential decrease in radiation efficiency due to surface-wave losses. In this paper, a photonic-bandgap (PBG) substrate for patch antennas is proposed, which minimizes the surface-wave effects. In order to verify the performance of this kind of substrate, a configuration with a thick substrate is analyzed. The PBG patch antenna shows significantly reduced levels of surface modes compared to conventional patch antennas, thus improving the gain and far-field radiation pattern.
Photonic Bandgap Antennas and components for Microwave and (Sub)millimetre wave Applications
2000
This paper discusses some application areas of PBG technology and shows some results of realised antennas and PBG waveguides at microwave and (sub)millimetre wave frequencies. The results are drawn from work on using 2-D PBG crystals as substrates for both single patch and patch array antennas at microwave frequencies and 3-D PBG crystals at submillimeter wave frequencies. In order to
Metamaterial antenna integrated to LiNbO3 optical modulator for millimeter-wave-photonic links
2015 International Symposium on Antennas and Propagation (ISAP), 2015
We report current research progress on a metamaterial antenna integrated to an optical modulator for millimeter-wave-photonic links. The metamaterial antenna is composed by an array of electric-LC resonators on a LiNbO3 optical crystal. Large millimeter-wave electric field is induced across the capacitive gaps of the resonators due to free-space millimeter-wave irradiation. Optical modulation through Pockels effects can be obtained when light propagates along the capacitive gaps. The integrated device is operated effectively by considering interaction between millimeter-wave and lightwave electric fields along the capacitive gaps. Basic operations of the integrated device for 90GHz millimeter-wave bands are reported and discussed. Optical sidebands with carrier-to-sideband ratio of about ™60dB by millimeter-wave irradiation power of ~20mW can be experimentally measured using optical spectrum analyzer.
Frontiers of Optoelectronics, 2012
In this paper, structure and microwave properties of a substrate removed GaAs/AlGaAs traveling wave electro-optic modulator structure were analyzed and simulated by using the finite element numerical technique for lower loss, simultaneous matching of optical and microwave velocities and impedance matching with 50 Ω. The effects of core layer thickness, claddings thicknesses, and width of the modulator on the microwave effective index n m were investigated, the characteristic impedance Z C , the microwave losses α, and the half-wave voltagelength product V π L were calculated. The results of the simulation suggest that the electrical bandwidth of 22 GHz and the optical bandwidth of 48 GHz can be obtained for fully matched, lower loss structure, which correspond to a 13 V$cm drive voltage.
Design and characterization of millimeter-wave antenna for integrated photonic transmitter
2000 Asia-Pacific Microwave Conference. Proceedings (Cat. No.00TH8522), 2000
For application to over 100-GHz millimeter-wave (mm-wave) transmitters using photonic techniques, we have designed and characterized a planar slot antenna on a Si substrate. By integrating a uni-traveling-carrier photodiode with the antenna, we have experimentally demonstrated radiation of mm-wave signals with power of >100 µW at 120 GHz.
Simulating Photonic Bandgap Antennas on Silicon Substrate
2006 7th International Symposium on Antennas, Propagation & EM Theory, 2006
With the idea of having Antennas on chip, this paper describes an implementation of a micro antenna fabricated on a silicon substrate in order to have uniformity in fabrication steps that will help bring down cost of manufacturing and efficiency of design. We have also looked into the field of Photonic or Electromagnetic bandgap (PBG/EBG) structures to increase the efficiency of the antenna by reducing the material loss and prevent surface waves to travel through the substrate.
Analysis and design of terahertz microstrip antenna on photonic bandgap material
2012
In this paper, a dielectric slab with periodic implantation of the air gaps has been analyzed. An effective dielectric permittivity of the 1-D photonic bandgap substrate material (PBG material) with host material as Polytetrafluoroethylene (PTFE) has been computed at 600 GHz. Based on the extracted effective dielectric permittivity, a rectangular microstrip patch antennas on thin and thick 2-D PBG material as substrate have been designed. The electrical performances of the antennas have been simulated by using two different simulators, CST Microwave Studio based on the finite integral technique and Ansoft HFSS based on the finite element method. This proposed antenna on the PBG material as substrate shows the significant enhancement in the directivity. To validate the homogenized medium approximation, the effect of the antenna position on the substrate material has been observed. The response of antenna has been found to be independent of its position. Various electrical parameters of the proposed antennas have been compared with reported literature. In addition to this, the operating frequency of one of the antenna has been scaled down by the factor of 50 and its various results have been compared with the results obtained at 600 GHz.