Mcgraw Hill Professional, Jun 2, 2009] or higher K. 5., 5 Antennas for Base Stations in Wireless Communications (Book). Wong, “Single-feed dual-frequency circular microstrip antenna with an open-ring slot,” Microwave Opt. The resonance frequency of the new mode can be either orthogonal polarization J.
CIRCULAR PATCH ANTENNA DESIGN PATCH
The dual frequency operation is achieved when the slots perturb the fundamental resonant frequency of the patch exciting a new resonance mode. Such a design can avoid the use of multiple antennas, like for instance, by integrating receiving and transmitting functions in to the same communication system. Mohan, a systematic design method to obtain broadband characteristics for singly-fed electromagnetically coupled patch antennas for circularly polarization, IEEE Trans Antennas Propag 51, 2003, 3239–3248.]. Using these kind of EBG structures, more attractive features are offered such as low profile, light weight, easy fabrication, integrability with microwave and millimeter-wave integrated circuits, and conformability to curved surfaces K.L. Chen, “Advances in microstrip and printed Antennas”, John Wiley &sons, Inc.1997]. Mcgraw Hill Professional, Jun 2, 2009], harmonic control K. EBG structures have been used in several applications, such as Directive antennas Antennas for Base Stations in Wireless Communications (Book). Another important characteristic of these materials is the ability to open localized electromagnetic modes inside the forbidden frequency band-gap by introducing defects in to the periodic structures J. They offer pass-band and stop-band (band-gap) to electromagnetic waves in the same way as the semiconductor do in electronics. 5.], that prevent/assist the propagation of electromagnetic waves in a specified band of frequency for all incident angles and all polarization states. Hence, the electromagnetic band gap structures are defined as artificial periodic (or sometimes non-periodic) objects, of dielectric materials and metallic conductors J. Chiou, Broad-band single-patch circularly polarized microstrip antenna with dual capacitively coupled feeds, IEEE Trans Antennas Propag 49, 2001, 41–44.]. Balanis, Antenna Theory Analysis and Design. A new concept of directive electromagnetic band gap (EBG) antenna will be analyzed Constantain. Mohan, a systematic design method to obtain broadband characteristics for singly-fed electromagnetically coupled patch antennas for circularly polarization, IEEE Trans Antennas Propag 51, 2003, 3239–3248.], reflector antennas, or horns are commonly used.
To fulfill these conditions, patch array antennas K.L. These systems must present the same characteristics as an antenna with linear polarization (high gain, simplicity of realization, etc.). In many telecommunication applications, particularly for the radio-relay, systems must radiate in circular polarization. Two approaches, one introduced by one layered Circularly-Polarized Patch-Slot antenna design with some changes in material configuration and the other produced by multilayered structures with different dielectric constants in the EBG resonator, are simultaneously used as key controllers of directivity enhancement.Įlectromagnetic waves & Propagation Electromagnetic Band Gap (EBG) resonator Circularly Polarized Slot-Patch Antenna Antennas Array Electric & Periodic lateral walls Dimensional characterization The analysis provided will confirm successfully the various proposed structures and interest occupied by these types of antenna. The same technique will be used for the EBG cirlcularly polarized circular slot-patch antenna network and carry two benefits (such as improvement of bandwidth, beamforming, creating zero radiation beams) and filtering characteristics of the resonator (spatial filtering, increased directivity, misalignment) due to the resonant structure itself. Thickness of substrate is chosen to reduce the spurious surface wave and width. Due to the exisiting of two feeding points, Position of both feeding points will permit Right-hand and Left-hand circular polarization operations. An arrangement combining the circular slot-patch antenna design and feeding sources included are considered is necessary. The operating frequency band can be controlled via the disk radius and adjusting the slit lengths. This paper is devoted to the design of a novel Electromagnetic Band Gap (EBG) circularly polarized slot-patch antenna in multilayered configuration.
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