Desing of a circularly polarized patch antenna for satellite communications in lband department of signal theory and communications polytechnic university of cataluna. Circularly polarized microstrip antenna semantic scholar. In this paper, a new feeding mechanism for patch antenna with circular polarization is proposed. With reference to figure 2a, the microstrip line impedances zi and. When the corners are truncated, the antenna radiates with circular polarization.
Design of dual circularly polarized sequentiallyfed patch. Design of striplinefed dualpolarization aperturecoupled stacked microstrip patch phased array antenna for wideband application. Dual orthogonal feed circular polarization array antenna. The input impedance of an insetfed microstrip patch antenna depends mainly on the inset distance, y 0, and to some extent on the inset width the. A microstrip patch antenna is an attractive candidate to provide reconfigurability with low profile, light weight, conformability, and easy fabrication.
Microstrip patch antenna all in its most basic form, a microstrip patch antenna consists of a radiating patch on one side of a dielectric substrate which has a ground plane on the other side. In this case both the feeding and the patch form one structure. Singlefeed realization method singlefeed for the patch to form circular polarization is based on the cavity model of microstrip antenna. The work on single feed frequency and polarization reconfigurable microstrip patch antenna is reported earlier. The coaxial feed introduces an inductance into the feed that may need to be taken into account if the height h gets large an appreciable fraction of a wavelength. A thicker substrate leads to a longer feed probe, a larger feed probe inductance and a degradation of impedance matching. The orthogonal linear polarization waves will be produced when the patch is fed at two adjacent edges. The basics of patch antennas, updated orban microwave. The probe position, the radius of the cylindrical connector and the length of the rectangular feed line should be carefully chosen to match the input impedance of the antenna. Kai chang due to the recent interest in broadband antennas a microstrip patch antenna was developed to meet the need for a cheap, low profile, broadband antenna. Specifically, the proposed method imposes simultaneously the circular polarization condition as well as an arbitrary input impedance matching condition.
A new circular polarization dual feed microstrip square patch. Design of patch antenna with switchable circular polarization. Single feed dual band circularly polarized microstrip patch. Dual feed microstrip patch antenna for wlan applications. Singlefeed circular polarization microstrip antenna. A tunable microstrip patch antenna with switchable. Pdf dual circularlypolarized patch antenna using even and.
The patch antenna element developed for the phased array sar pharus operating at 5. A wideband circularly polarized patch antenna for 60 ghz. Reconfigurable patch antennas with fourpolarization states. When two pin diodes are used to respectively reconfigure the coupling slot and the open stub of the feed line, the polarization of the microstrip antenna can be switched between vertical and horizontal polarizations. A novel singlefeed circular microstrip antenna with.
Shorted circular microstrip antennas for 50 microstrip line feed with very low cross polarization shivraj m. Single feed dual band circularly polarized microstrip. Since the current is low at the ends of a halfwave patch and increases in magnitude toward the center, the input impedance zvi could be reduced if the patch was fed closer to the center. The patch is of length l, width w, and sitting on top of a substrate some dielectric circuit board of thickness h with permittivity. Us15748,729 20150730 20160727 microstrip patch antenna aperture coupled to a feed line, with circular polarization active us10468783b2 en priority applications 5 application number. A broadband singlefeed circularly polarized patch antenna. When designing an antenna, deciding on a particular. The fundamentals of patch antenna design and performance.
A corner truncated patch element with single input microstrip feed is designedfabricated on. Bifurcating the microstrip feed line into two branches allows the polarization to be switched by opening and shorting the termination of the line using an anti. Triple feed patch antenna quadcopters maarten baerts. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. The image below shows two ways to feed the microstrip patch, on the left is a microstrip feed and on the right is a coax feed. Wideband duallinear polarized microstrip patch antenna.
Additional benefits of patch antennas is that they are easily fabricated making them cost effective. The feeding direct techniques were illustrated by mandal 6. It can switch between linear polarization lp, rhcp and lhcp at dual frequency. Dual linearly polarized microstrip array antenna intechopen.
A prototyped antenna realized up to 20 db isolation. The patch antenna, microstrip transmission line and ground plane are made of high conductivity metal typically copper. This method employs ground plane between two substrates. The design of the proximity fed antenna requires one additional parametric study on the length of the feed line while the aperture fed antenna requires two additional parametric studies on the length of. When two pin diodes are used to respectively reconfigure the coupling slot and the open stub of the feed line, the polarization of the microstrip antenna can be switched between. Singlefed microstrip patch antenna with switchable polarization. Original lp patch antenna the original antenna is a square patch fed by two ports at two adjacent edges as shown in figure 1.
Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. The patch is coupled to four asymmetric cross slots via a microstrip ring with eight matching segments underneath the ground plane, traversing through the arms of the cross slots in a serial manner. Topics include principles of operation, impedance matching, radiation patterns, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher. Using thick substrates leads to difficulties in feeding the patch antenna. A kaband 26 ghz circularly polarized 2x2 microstrip patch. A tunable microstrip patch antenna with switchable polarization. What dielectric constant defines the half wavelength. This antenna has a simple structure, which consists of a radiating circular patch, five switches pin diode, three matching stubs, and a 50 microstrip feed line. Us10468783b2 microstrip patch antenna aperture coupled to a. A patch antenna is fed by multimode transmission line and the advantages and disadvantages are discussed. Circular polarization is achieved by energizing the patch.
Dual circularlypolarized patch antenna using even and odd feed line modes article pdf available in ieee transactions on antennas and propagation 619. The proposed design uses a simple seriesfed network to increase the cp bandwidth without requiring onebyone adjustment of each array element or a complex feed network. A singlefeed circular microstrip antenna with reconfigurable polarization capability is proposed. The square patch antenna has the side length of l and is printed on a substrate with a thickness of h. Two of the most common ways to feed the patch antenna would be to use a microstrip line. This antenna has a simple structure, which consists of a radiating circular patch. We use a simple rectangular, half wave long, probefed patch operating in its fundamental mode as an example. The dielectric constant that controls the resonance of the antenna is the effective dielectric constant of the microstrip line.
Design of circular polarized dual band patch antenna. This means that on each side of the feed line there should be a distance of 12 the microstrip width on each side of the microstrip between the microstrip feed line and the patch antenna. A patch antenna is fed by multimode transmission line and the advantages and disadvantages are. Microstrip line feed is one of the easier methods to fabricate as it is a just conducting strip connecting to the patch and therefore can be consider as extension of patch. Selecting the appropriate spacing between each array element allows the proposed array antenna to generate cp. A microstrip antenna is disclosed having an etched metal radiator element including a polarizing patch consisting of a two dimensional removal of metallization from the central portion of the radiator element with one dimension of the polarization patch being greater than the other dimension e. The detailed parameters of the antenna structure and packaging are listed in. Alternate feed methods a common variation in patch antenna design is the location and routing of the feed, to obtain a desired feedpoint impedance, to control the polarization, or for convenient layout. Pdf dual circularlypolarized patch antenna using even. A wideband circularly polarized patch antenna for 60 ghz wireless communications 99.
The patch cutout for the feed inset should be 2 times the microstrip width. A bandwidthenhanced, compact, singlefeed, lowprofile. Antenna polarisation is an important factor when designing and erecting radio antennas or even incorporating them into small wireless or mobile communications systems. Simulations and tests shows that the antenna is circular polarized and have a. And a coupling slice instead of a resistive load is used as matching load of the microstrip ring for. When two pin diodes are used to respectively reconfigure the coupling slot and the open stub of the feed line, the polarization of the microstrip antenna can be. Dual circularlypolarized patch antenna using even and odd feed. The feedline, in this case a microstrip line, is etched alongside the patch at the center of. It was decided to design a patch antenna from the theoretical study since it fulfils all the requirements for the antenna.
The frequency diversity characteristic of the antenna is realized by switching a pin diode on a slot of rectangular patch on and off 1. Linear polarization feed horns switching from linear polarization to circular polarization is easier than many think. A cornertruncated patch is introduced as a nearfield resonant parasitic element directly beneath a specially engineered radiation patch. Microstrip patch antenna having frequency and polarization diversities simultaneously. Three approaches to derive circular polarization from patch antennas. A broadband single feed circularly polarized patch antenna with wide beamwidth is presented. The baseline configuration uses a square patch insetfeed technique on the top layer. A bandwidthenhanced, compact, singlefeed, lowprofile, multilayered, circularly polarized cp patch antenna is presented. Shorted circular microstrip antennas for 50 microstrip line. Design of striplinefed dual polarization aperturecoupled stacked microstrip patch phased array antenna for wideband application. The rectangular patch antenna radiates by utilization of a coaxial feeding probe technique, which is an extremely co mmon 4, 7.
The patch is generally made of conducting material such as copper or gold and can take any possible shape. Seriesfed microstrip array antenna with circular polarization. The antenna has a simple feeding geometry, which is an integration of a hook shape feed line and four. This article introduces the basic concepts of patch antennas. The position of the feed can be altered as before in the same way as the inset feed, above to control the input impedance. A singlefed reconfigurable microstrip antenna that can provide various polarization diversities is presented in this paper. In the antenna in figure 1, the center conductor of a coaxial line serves as the feed probe to couple electromagnetic energy in andor out of the patch.
Kai chang recent days, antennas play an important role in wireless communication system. A single feed circular microstrip antenna with reconfigurable polarization capability is proposed. It is simple to model and easy to match by controlling the inset position. Axial ratio bandwidth of a circularly polarized microstrip. Singlefed microstrip patch antenna with switchable.
This can be compensated by using a different feed type and well look at. Novel aperturecoupled microstripline feed for circularly. Index termsantenna feeds, circular polarization, dual. The truncation splits the field into two orthogonal modes with equal magnitude and 90 phase shift. The antenna is excited by a microstrip feed line through aperture coupling. However, two important drawbacks of singlefeed patch antennas are their. Design of dual band dual polarized microstrip patch antennas core. A novel single feed frequency and polarization reconfigurable.
Abstracta singlefeed circular microstrip antenna with recon. In microstrip feed, the patch is fed by a microstrip line that is located on the same plane as the patch. Circular polarization is generated by truncating two opposite edges from a circular patch antenna at 45 to the feed. The design of the proximity fed antenna requires one additional parametric study on the length of the feed line while the aperture fed antenna requires two additional parametric studies on the length of the feed line and the diameter of the ground slot.
Ray2 abstracta circular microstrip antenna cmsa cannot be fed directly with 50 microstrip ms line, without an inset or an impedance transformer, as all around the periphery the. Since this typically yields a high input impedance, we would like to modify the feed. Single feed realization method single feed for the patch to form circular polarization is based on the cavity model of microstrip antenna. The dielectric constant that controls the resonance of the antenna is the. Dual resonant frequencies are obtained by inserting a slot in patch. The present paper demonstrates a frequency and polarization reconfigurable microstrip patch antenna with simple feed structure. Us4191959a microstrip antenna with circular polarization. The triple feed patch antenna is a directional circularly polarized antenna that i created in collaboration with robin theunis, one of my coworkers. Consider the microstrip antenna shown in figure 1, fed by a microstrip transmission line. Cst microwave studio softwareis used to simulate the antenna design. Dual circularlypolarized patch antenna using even and odd feedline modes article pdf available in ieee transactions on antennas and propagation 619. Couplefed circular polarization bow tie microstrip antenna. The proposed antenna consists of a microstrip feed line, a ground plane with two slots, and a radiation patch.
1339 353 660 69 159 893 492 170 985 265 1201 330 1543 1302 205 299 334 1484 297 1155 1399 758 1426 903 965 964 1458 1114 1242 891