Abstractan innovative water dense dielectric patch antenna fed by lprobe is proposed and investigated. Abstracta new high gain wideband lprobe fed inverted eeh shaped slotted leeh microstrip patch antenna is presented in this paper. Wideband modified lprobe fed circularly polarized patch antenna with conical beam radiation pattern. Circularly polarized probefed patch antenna with truncated corners. Pdf design of a modified lprobe fed microstrip patch antenna. A finite size ground plane with a thicker substrate is located about 10mm 0. Probe feed microstrip patch antenna computer aided design. This paper presents the design of a rectangular microstrip patch antenna to operate at frequency range of 2 ghz to 2. The planar antenna is a square patch with an lprobe feed designed to operate at two frequencies, 1. In this paper, an analysis of broadband lprobe fed variations of microstrip. Wideband lprobe fed circular patch antenna for conical. By superposition, it is possible to state that the radiation pattern associated to the lshaped wire antenna shown in fig.
Wideband patternreconfigurable antenna with switchable. By supporting an l probe coupled circular patch antenna with four metallic posts at appropriate locations, it is demonstrated that the conical and the broadside modes which are excited separately by two different sets of l shaped probes. The lengths of the two lshaped probe feeds are identical, but the feeds are antisymmetric. In this paper, the finitedifference timedomain fdtd method is employed to analyze lprobe proximityfed rectangular patch antennas. Wideband modified lprobe fed circularly polarized patch. The lprobe feed provided the simplicity of fabrication for the design because of it cant be physically connected to the water patch. The designed twin lshaped probe feeding structure is able to introduce feed capacitance to the antenna for broadband operation.
Antenna radiation pattern is measured in patch hplane yzplane in fig. Increase of a patch bandwidth is achieved by utilizing a dcp feed, as shown in fig. In this paper, an analysis of broadband l probe fed variations of microstrip antenna like, circular microstrip antenna, annular ring microstrip antenna, rectangular microstrip antenna, eshaped microstrip antenna and half eshaped microstrip antenna, is presented. In this paper, a modified lstrip fed patch antenna is theoretically analyzed for wideband applications. The radiation pattern is stable technique is a convenient way for feeding patch across the passband with low cross polarization. Switchable linearly polarized broadside and conical radiation patterns are achieved by systematically integrating a wideband lowprofile monopolar patch antenna with a wideband lprobe fed patch antenna. In order to achieve an simple seriesfed 8element array antenna is acceptable efficiency, expensive microwave designed and tested. Lprobe fed conformal patch altair hyperworks insider. Research on dualpolarized circular waveguide antenna fed by. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces.
The l probe feeding technique is used to feed water patch, its indirect method for feeding the antenna which is widely used in conventional metallic patch antenna. Design of a modified lprobe fed microstrip patch antenna ieee. This antenna is often built of printed circuit board material and the substrate makes up the patch antenna s dielectric. The characteristics of a rectangular microstrip antenna with an lshaped probe are investigated. Figure 3 a patch may be fed at two points along adjacent edges. The position of the feed can be altered as before in the same way as the. This paper presents a hybrid ring feeding dualpolarized patch antenna with high isolation in a wide working band. The l shaped probe, which acts as a series lc resonator, does not introduce high feed inductance. The lshaped probe is shown to be an excellent feed for the thick circular patch antenna. The configuration of the singleelement lprobefed patch antenna is discussed first. This paper proposes the design of wideband microstrip patch antenna using lprobe fed. Experimental results for a wideband l probe fed circular patch antenna having conical pattern radiation are presented. Geometry of patch antenna a patch can also be fed with a probe through ground plane.
Consider the microstrip antenna shown in figure 1, fed by a microstrip transmission line. Further, when two parasitic elements are used, antenna bandwidth improves up to 25. A dualpolarized patch antenna element fed by a pair of antisymmetric lshaped probes is proposed. The probe position can be inset for matching the patch impedance with the input impedance. Wideband lprobe fed circular patch antenna for conicalpattern radiation article in ieee transactions on antennas and propagation 524. With incorporating l probe fed, two l shaped slits and truncated corners on the patch, the proposed antenna exhibits a bandwidth of 27% 2. A modified lprobe fed microstrip patch antenna is proposed. Design of probe feed microstrip patch antenna in s band.
The fundamentals of patch antenna design and performance. By replacing the bent part of an l probe with a printed strip on a suspended substrate and by placing a radiating patch beneath the. A wideband lprobe fed patch antenna for pattern reconfiguration. The simulated and measured parameters of the proposed antenna are shown in figure 8. A wideband, compact pattern reconfigurable antenna is reported that is, for example, a good candidate for ceiling mounted indoor wireless systems. Parametric study were performed to analyze the effects of the design towards. Wideband rectangular microstrip patch antenna using l. Here the conformal lprobe fed patch antenna is modeled in feko to compare the impedance match and radiation patterns for the conformal antenna to that of its planar equivalent.
Numerical results for the input impedance, co and crosspolarization radiation patterns are presented and compared with the measurements. By supporting an l probe coupled circular patch antenna with four metallic posts at appropriate locations, it is demonstrated that the conical and the broadside modes which are excited separately by two different sets of l shaped probes, can be operated at the same frequency range. Analysis and design of lprobe proximity fedpatch antennas. A transmission line model is used for the calculation of its input impedance. The lprobe has a simple structure and wide bandwidth whereas the mprobe has low cross polarization and a symmetric radiation pattern within the operating frequencies. Dual uslot loaded patch antenna with a modified lprobe feeding. In coaxial probe feed, there are two materials, say inner and outer. Highgain l probefed planar and cylindrical patch antenna for x. Figure 2 feeding the patch antenna with the feedline on the underside of the substrate laminate. A modified l probe fed microstrip patch antenna is proposed. Design guidelines of the two kinds of patch antennas.
High isolation dualpolarized patch antenna with hybrid ring. Design of wideband microstrip patch antenna using lprobe fed. T abstract there are various types of microstrip antenna that can be used for many applications in communication systems. In the present paper, annular ring patch antenna with l probe feeding has been analyzed using modal expansion cavity model.
Design of a wideband l probe patch antenna for pattern reconfiguration or diversity applications abstract. An lprobe coupled circular patch antenna with four metallic shorting posts is demonstrated. Analysis of lprobe proximity fed annular ring patch antenna. If the ratio lw is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. In this paper, the lprobe patch antenna is studied using the finitedifference timedomain fdtd method because of its flexibility and efficiency in solving complex heterogeneous geometries. International journal of engineering trends and technology. There are several feeding mechanisms for patch antennas.
Both the uslot patch and the l probe feed patch can attain over 30% bandwidth. A foam layer with a thickness of around 10% of the wavelength is used as the supporting substrate. Design of a wideband lprobe patch antenna for pattern. The patch is of length l, width w, and sitting on top of a substrate some dielectric circuit board of thickness h with permittivity. Design of a modified lprobe fed microstrip patch antenna. Design analysis of high gain wideband lprobe fed microstrip. Lprobe fed planarrectangular microstrip patch antenna.
The l probe has a simple structure and wide bandwidth whereas the m probe has low cross polarization and a symmetric radiation pattern within the operating frequencies. This paper presents the design of a rectangular microstrip patch antenna to operate at frequency range of 2. Dual ushaped slots are incorporated in the radiating patch and a maximum bandwidth of 16. L probe provides a huge amount of impedance bandwidth by mounting the patch on a planar and cylindrical substrate. Index terms probe feed, antenna and radiation efficiency, return loss, radiation pattern, substrate i. The radiation pattern of the structure is obtained by aperture method. The integration of these techniques leads to a new patch. Experimental results for a wideband lprobe fed circular patch antenna having conicalpattern radiation are presented. The location of the feed is selected for the proper impedance, and to create a current distribution that results in the desired polarization of the radiated wave. In this study, a new circularly polarized antenna covering the 2. Coaxfed microstrip patch antenna element similarly, a patch antenna has also been designed at 5. Increase in length of the microstrip patch probe feed microstrip antenna typically, to excite the fundamental tem mode, the length l. This example shows the steps to model and analyze a probe fed stacked patch antenna. Conforming the patch to a spherical surface is done.
In this paper, a modified l strip fed patch antenna is theoretically analyzed for wideband applications. This example shows the steps to model and analyze a probefed stacked patch antenna. The substrate used is a foam layer of thickness about 10% of the operating wavelength. Circularly polarized suspended patch antenna fed by. Analysis of lprobe fedpatch microstrip antennas in a.
Both of the ground plane gx, gy and the radiating patch w, l are made up of rectangular aluminum plates, while the probe is built using a copper wire. Meanwhile, many solutions to achieve multiplefrequency operation were carried out 69, such as the multilayer stacked patch antenna 6, the reactiveloading patch antennas by adding shorting pins andor etching slots on a patch 79. Design of probe feed microstrip patch antenna in sband 419 figure 2. Return loss for various combinations of the lprobe, the additional wire and the patch. L probe fed msas the l probe fed rmsa is shown in fig. The planar antenna is a square patch with an l probe feed designed to operate at two frequencies, 1. The proposed antenna consists of a circular radiating patch printed on the upper horizontal substrate, two pairs of shaped strips printed on two vertical substrates, and a hybrid ring feeding network printed on the lower two horizontal substrates. The distance between the patch and the ground plane the. The berengers perfectly matched layer pml is used as the absorbing boundary condition abc. Typical half wave patches have efficiencies well above 90%. The reflection coefficients and gains of the l probe fed patch antenna with uslots are depicted in figure 11 as compared with those of the proposed m probe fed patch antenna. Electric field from a microstrip patch antenna figure 3. Analysis and design of lprobe proximity fed patch antennas.
Fundamental specifications of patch antennas radiation pattern a patch antenna radiates power in certain directions and we say that the antenna has directivity usually expressed in dbi. Analysis and design of lprobe proximity fedpatch antennas abstract. Sep 08, 2010 here the conformal l probe fed patch antenna is modeled in feko to compare the impedance match and radiation patterns for the conformal antenna to that of its planar equivalent. A new high gain wideband lprobe fed inverted eeh shaped slotted leeh microstrip patch antenna is presented in this paper. Modeling and analysis of a probefed stacked patch antenna. Simulated and measured copolarization radiation pattern in hplane are shown in fig. Pdf a modified lprobe fed microstrip patch antenna is proposed. The stacked patch configuration is one of the ways of increasing the impedance bandwidth of these antennas to be greater than 25% 1. Figure 7 shows the gain pattern of the antenna with a peak gain of 9. Having a 125 degree input range with this patch antenna would suffice for a gps. For a rectangular patch, the length l of the patch is usually 0.
Analysis of broadband lprobe fed microstrip antennas. Radiation patterns of the improved structure are shown in fig. Dualband patch antenna fed by meandering probe for low cross. Probe fed patch antenna array using rohacell dielectric material. By supporting an lprobe coupled circular patch antenna with four metallic posts at appropriate locations, it is demonstrated that the conical and the broadside modes which are excited separately by two different sets of lshaped probes, can be operated at the same frequency range. The antenna is fabricated on rtduroid substrate of thickness 0. Pdf analysis of lprobe fed slotted microstrip patch antenna. Switchable linearly polarized broadside and conical radiation patterns are achieved by systematically integrating a wideband lowprofile monopolar patch antenna with a wideband l probe fed patch antenna. Lprobe fed msas the lprobe fed rmsa is shown in fig. Lprobe fed circular patch antenna with 30% bandwidth vswr.
Increase in length of the microstrip patch probe feed microstrip antenna typically, to excite the fundamental tem mode, the length l of the rectangular patch. The outer conductor of the coaxial cable is connected to the ground plane, and the center conductor is extended up to the patch antenna. Also, the measured result shows that, although its feed shadows part of the radiating patch, the proposed antenna has a nearly ideal radiation pattern. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. Wide band lprobe fed circular patch antenna with elliptical. The patch antenna, microstrip transmission line and ground plane are made of high conductivity metal typically copper. The antenna array is substrates are usually selected. A wideband, compact patternreconfigurable antenna is reported that is, for example, a good candidate for ceiling mounted indoor wireless systems. With incorporating lprobe fed, two lshaped slits and truncated corners on the patch, the proposed antenna exhibits a bandwidth of 27% 2. For verification, a dualpolarized patch antenna is implemented and its fabrication prototype is shown in figure 7.
The tmsub 01 conical and the tmsub 11 broadside modes coul. The first cp patch to be considered is a probefed rectangular patch with two opposite corner truncations as shown in figure 19. The microstrip patch antenna calculator determines the length l and width w of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. This pattern is heavily dependent on the ground plane being relatively large to the antenna.
The structure consist of airfilled substrate with dielectric permittivity. The standard rectangular microstrip patch antenna has a narrow impedance bandwidth typically lesser than 5%. Microstrip antennas can also be fed from underneath via a probe as shown in figure 3. Dual uslot loaded patch antenna with a modified lprobe. A 5g wideband patch antenna with antisymmetric lshaped. The operation mechanism of the water ddpa perform similar to the conventional rectangular metallic patch antenna operated in the fundamental tm 10 mode. Additional benefits of patch antennas is that they are easily fabricated making them cost effective.
Abstract of concern is the feed line loss in the design of using lprobe patch antennas as elements, a printed patch arrays. By replacing the bent part of an lprobe with a printed strip on a suspended substrate and by. The proposed antenna shows wide band and ultra wide band operation which depends on the position of l probe feeding and position of the shorting pin. The guidelines for selecting total lprobe length are not available in the reported literature.
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