Showing papers on "Folded inverted conformal antenna published in 2000"
TL;DR: In this paper, a pair of right-angle slots and a modified U-shaped slot in a rectangular microstrip patch were used for bandwidth enhancement of a microstrip antenna with good radiating characteristics.
Abstract: With the loading of a pair of right-angle slots and a modified U-shaped slot in a rectangular microstrip patch, novel bandwidth enhancement of microstrip antennas is demonstrated. The required dimensions of the right-angle slots and modified U-shaped slot for bandwidth enhancement with good radiating characteristics have been determined experimentally in this study and the obtained antenna bandwidth can be as large as about 2.4 times that of a corresponding unslotted rectangular microstrip antenna. Details of the antenna design and experimental results are presented and discussed.
176 citations
Patent•
29 Mar 2000
TL;DR: In this article, an antenna structure including a driven antenna element is formed on a substrate that is folded to provide a closed surface, causing the substrate to be nonplanar and spacing the antenna element from a base of the substrate.
Abstract: An antenna structure including a driven antenna element is formed on a substrate that is folded to provide a closed surface, causing the substrate to be nonplanar and spacing the driven antenna element from a base of the substrate. Adhesives on an outside surface of the substrate permit fastening of the folded substrate to a container or packaging. The substrate may have one or more resilient elbows formed by folding, to bias the antenna element carrying portion of the substrate from the base of the substrate. A modulation circuit may drive the driven antenna element. The flexible substrate may be folded into any of a variety of forms such as a substantially O-shape, a substantially oval shape, a substantially coil shape, a substantially spiral shape, and a substantially S-shape. Additional folds in the substrate may provide surfaces for mounting passive or parasitic antenna elements, such as reflectors and directors, to form a Yagi antenna structure. A planar substrate carries a driven antenna element coupled to a driving circuit and at least one passive antenna element to form a directional antenna structure. The antenna structure may include additional passive antenna elements to enhance directionality. A computing system and printer are configured to determine the appropriate spacing and the form of the antenna elements on the substrate.
146 citations
Patent•
28 Aug 2000
TL;DR: In this paper, the authors proposed a planar antenna with a parasitically fed feed element and a conductive strip placed on the same insulating board as the feed element to provide a reliable dual resonance.
Abstract: The invention relates to planar antennas the structural components of which include a parasitic element. The antenna structure comprises a PIFA-type structure ( 230, 210, 202 ) to be placed inside the covers of a mobile station. The PIFA is fed parasitically e.g. through a conductive strip ( 240 ) placed on the same insulating board. The feed conductor ( 203 ) of the whole antenna structure is in galvanic contact with this feed element; a short-circuit point the feed element doesn't have. The feed element ( 240 ) also serves as an auxiliary radiator. The resonance frequencies of the antenna elements or their parts are arranged according to need so as to overlap, to be close to each other or to be relatively wide apart. The structure may also comrise a whip element in connection with the feed element. According to the invention, a relatively simple structure provides a reliable dual resonance and, hence, a relatively wideband antenna when the resonances are close to each other. Moreover, no polarization rotation takes place in the antenna radiation inside the frequency band realized through the dual resonance.
142 citations
TL;DR: In this paper, a circular-polarized cylindrical dielectric resonator antenna excited by dual conformal strips is investigated experimentally, which offers a wide axial-ratio bandwidth of 20%.
Abstract: A circular-polarised cylindrical dielectric resonator antenna excited by dual conformal strips is investigated experimentally. The configuration offers a wide axial-ratio bandwidth of 20%. We measured axial ratio, radiation patterns and antenna gain of the configuration are presented and discussed.
111 citations
16 Jul 2000
TL;DR: An internal dual-band mobile phone antenna designed to operate at GSM900 and GSM1800 bands is presented in this paper, which is derived from a quarter-wave planar inverted F-type antenna, which has proved to be the most promising candidate for mobile applications due to its compact size and good performance.
Abstract: An internal dual-band mobile phone antenna designed to operate at GSM900 and GSM1800 bands is presented. The antenna is derived from a quarter-wave planar inverted F-type antenna, which has at this state proved to be the most promising candidate for mobile applications due to its compact size and good performance. The FDTD method is used in the study and an experimental verification is also provided.
104 citations
06 Nov 2000
TL;DR: In this article, an integrated planar inverted-F antenna (PIFA) is proposed and analyzed, which is printed on the RF printed circuit board of a wireless communication device.
Abstract: An integrated planar inverted-F antenna (PIFA) is proposed and analyzed. The antenna is printed on the RF printed circuit board of a wireless communication device. Numerical analysis data shows that such an antenna can be utilized with as small as 22 mm by 5 mm by 1 mm of volume. The volume occupancy can be further reduced by adjusting various different antenna parameters. Such guidelines have also been presented. A laboratory prototype of such an antenna has been built and tested. Measured VSWR frequency data show that the antenna has adequate bandwidth within 2:1 VSWR for Bluetooth application. Radiation patterns have been measured in three orthogonal planes of the antenna using both dominant and cross polarizations. Test data demonstrated that the Bluetooth PIFA had comparable performance to a half-wave dipole.
93 citations
Patent•
14 Mar 2000TL;DR: In this paper, a built-in, low-profile antenna having an inverted planar inverted F-type (PIFA) antenna and a meandering parasitic element having a wide bandwidth to facilitate communications within a plurality of frequency bands is disclosed.
Abstract: A built-in, low-profile antenna having an inverted planar inverted F-type (PIFA) antenna and a meandering parasitic element having a wide bandwidth to facilitate communications within a plurality of frequency bands is disclosed. The main element is placed at a predetermined height above a substrate of a communication device and the parasitic element is placed on the same substrate as the main antenna element and is grounded at one end. The feeding pin of the PIFA is proximal to the ground pin of the parasitic element. The coupling of the meandering, parasitic element to the main antenna results in two resonances. These two resonances are adjusted to be adjacent to each other in order to realize a broader resonance encompassing the DCS, PCS and UMTS frequency ranges.
93 citations
TL;DR: In this paper, an antenna structure based on the geometry of a bent folded monopole antenna capable of dual resonance frequencies operation is discussed, which is able to cover the GSM/DCS 1800 communication system bands.
Abstract: With the introduction of DCS1800 to meet the demands for a wider frequency spectrum for mobile communication systems, novel antenna structures capable of generating dual resonance are in demand. An antenna structure based on the geometry of a bent folded monopole antenna capable of dual resonance frequencies operation is discussed. This antenna is able to cover the GSM/DCS 1800 communication system bands.
62 citations
TL;DR: In this paper, a square microstrip fractal patch antenna in a Sierpinski carpet is proposed for three-band operation and measured results indicate that the return loss is better than 10 dB and the gain is greater than 7 dB in each band.
Abstract: A novel square microstrip fractal patch antenna in a Sierpinski carpet is proposed for three-band operation. Measured results indicate that the return loss is better than 10 dB and that the gain is greater than 7 dB in each band. This antenna is an attractive candidate for wireless, satellite and mobile communication applications.
60 citations
TL;DR: In this article, a two-layer rectangular shorted patch antenna is described, which is supported by a foam substrate, and the resonant frequency is reduced by 71% when compared to that of a conventional patch antenna with the same projection area.
Abstract: A novel two-layer rectangular shorted patch antenna is described. The patch antenna is supported by a foam substrate. The resonant frequency is reduced by 71% when compared to that of a conventional patch antenna with the same projection area. The bandwidth (SWR<2) and gain are, respectively, 11% and 0 dBi.
60 citations
TL;DR: In this paper, a circular microstrip antenna loaded along its feed axis with either one stub or two stubs has been analyzed using an improved linear transmission line model, when the length of the stub is small, the frequency is tuned over a 9% range in the L-band and when it is comparable to /spl lambda//4, it exhibits dual-frequency operation.
Abstract: A circular microstrip antenna loaded along its feed axis with either one stub or two stubs has been analyzed using an improved linear transmission line model. When the length of the stub is small, the frequency is tuned over a 9% range in the L-band and, when it is comparable to /spl lambda//4, it exhibits dual-frequency operation. The experimental results are in good agreement with the theoretical results.
TL;DR: In this article, a new feeding mechanism was presented that overcomes the usual problems associated with matching an annular-ring antenna, which consists of a probe-fed rectangular strip that is capacitively coupled to the annular ring.
Abstract: A new feeding mechanism is presented that overcomes the usual problems associated with matching an annular-ring antenna. It consists of a probe-fed rectangular strip that is capacitively coupled to the annular ring. Numerical and experimental results for gain, bandwidth and radiation patterns are presented.
TL;DR: In this article, a dual linearly polarized operation of a compact slot-loaded square microstrip antenna is investigated, where four symmetrical bent slots are embedded in the square patch, and placed in parallel with the patch's central lines or diagonals to achieve lowered operating frequencies.
Abstract: Dual linearly polarized operations of a compact slot-loaded square microstrip antenna are experimentally investigated in this paper. Four symmetrical bent slots are embedded in the square patch, and placed in parallel with the patch's central lines or diagonals to achieve lowered operating frequencies of the two linearly polarized radiations(0 and 90° polarizations or ±45° slanted polarizations), which results in a reduced antenna size at a fixed operating frequency. Experimental results show that, for such a compact dual-polarized microstrip antenna with an inexpensive FR4 substrate, isolation between the two feeding ports better than 35 dB can easily be obtained, which is also better than that of a corresponding unslotted dual-polarized square microstrip antenna. In addition, the cross-polarization level in the E- and H-plane patterns for the compact dual-polarized microstrip antenna studied is about as good as that of an unslotted square microstrip antenna. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 284–287, 2000.
01 Jan 2000
TL;DR: This paper describes the design, fabrication and characterization of planar microstrip antenna arrays for 77 GHz sensors applications and a novel method is presented, which is based on the commonly used transmission line model.
Abstract: This paper describes the design, fabrication and characterization of planar microstrip antenna arrays for 77 GHz sensors applications. For the synthesis of the series-fed microstrip array antenna, a novel method is presented, which is based on the commonly used transmission line model. Different antenna types have been realized and characterized by measurements.
Patent•
14 Jan 2000TL;DR: In this paper, the antenna consists of a combination of one or several different antenna types, each antenna type can be provided once or several times, and the combination of the antennas is fed only at one point.
Abstract: The antenna consists of a combination of one or several different antenna types. Each antenna type can be provided once or several times. The combination of the antennas is fed only at one point. Preferably, the combination includes at least two antenna types of the types planar inverted F-antenna, planar inverted L-antenna or microstrip antenna. The coupling between the antennas can be capacitive, inductive, radiative, or galvanic. The antenna can be integrated in the housing wall of the terminal housing.
TL;DR: In this paper, a circularly polarized (CP) circular patch microstrip antenna with a cross slot using an L-shaped probe fed by a microstrip line is designed and measured, with the single L-probe, the impedance bandwidth, the axial-ratio bandwidth, and the gain bandwidth are 27, 3.47, and 26%, respectively, for the left-hand circular polarization (LHCP) excitation.
Abstract: A circularly polarized (CP) circular patch microstrip antenna with a cross slot using an L-shaped probe fed by a microstrip line is designed and measured. With the single L-probe, the impedance bandwidth, the axial-ratio bandwidth, and the gain bandwidth are 27, 3.47, and 26%, respectively, for the left-hand circular polarization (LHCP) excitation, which provides a good improvement over the one with other single-point feeding techniques. This microstrip/L-probe feed can be extended to the design of a CP antenna array using sequential rotation. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 412–414, 2000.
29 Oct 2000
TL;DR: The biconical antenna offers characteristics similar to an antenna array through multiple modes using just a single antenna element and is an interesting antenna solution for future high capacity MIMO systems.
Abstract: A novel way of exploiting diversity by employing the higher order modes of a biconical antenna is introduced. Essentially, the biconical antenna offers characteristics similar to an antenna array through multiple modes using just a single antenna element. An analytical expression for the correlation between different modes in a realistic environment is presented. It is found that the correlation is low enough to yield a diversity gain. Furthermore, the channel capacity of a multi-input multi-output (MIMO) system using a multimode antenna, i.e. an antenna employing multiple modes, is found to be comparable to that of an array. Since only one antenna element is needed, the multimode antenna offers several advantages over traditional arrays and is an interesting antenna solution for future high capacity MIMO systems.
Patent•
01 Mar 2000
TL;DR: In this paper, an integrable multiband antenna is presented in the form of a meander with two or more indentations, the length of the meander approximately corresponding to the size range of the received and transmitted frequencies.
Abstract: The invention relates to an integrable multiband antenna. The aim of the invention is to guarantee a good integrability of such a multiband antenna. To this end, the antenna is produced in the form of a meander with two or more indentations, the length of the meander approximately corresponding to the size range of the received and transmitted frequencies.
16 Jul 2000
TL;DR: In this article, the multiband behavior of the Sierpinski patch antenna is described, and a new technique to improve the multi-band behavior from the point of view of the radiation patterns is introduced.
Abstract: The multiband behavior of the Sierpinski patch antenna is described, and a new technique to improve the multiband behavior from the point of view of the radiation patterns is introduced. The technique suppresses the effects of the high order modes and a patch antenna with similar radiation patterns can be designed. Once the high order mode has been suppressed for the second band, the next step is to try eliminate it for the third and fourth band breaking the appropriate junctions.
16 Jul 2000
TL;DR: In this paper, a new stacked microstrip antenna structure that enhances the bandwidth without changing the resonance frequency is proposed and studied and the effect of various antenna parameters on the bandwidth is investigated.
Abstract: A new stacked microstrip antenna structure that enhances the bandwidth without changing the resonance frequency is proposed and studied in this paper. The effect of the various antenna parameters on the bandwidth is investigated. The resulting antenna using the proposed structure has an ultra-wide bandwidth of 35%, compared to 21.8% for the conventional stacked antenna structure. The proposed structure has a little effect on the antenna radiation characteristics. The analysis of the proposed structure is carried out using the FDTD method.
Patent•
21 Dec 2000
TL;DR: In this article, a planar microstrip patch antenna is proposed, which includes a substrate made of dielectric material, a microstrip, made of a conductive metal, formed on the substrate, a feeding conductor to electrically connect to an end of the microstrip patches, and a ground face disposed on a side of the substrate.
Abstract: A planar microstrip patch antenna of the present invention has a high antenna efficiency and gain by implementing a microstrip patch formed in a shape of a zigzag or a H-slot The planar microstrip patch antenna includes a substrate made of a dielectric material, a microstrip patch, made of a conductive metal, formed on the substrate, a feeding conductor to electrically connect to an end of the microstrip patch, and a ground face disposed on a side of the substrate
03 Dec 2000
TL;DR: In this article, an improved PBG lattice deviating from square lattice on a microstrip patch antenna is proposed, and both circular and annular ring slots are investigated on the ground plane of patch antenna.
Abstract: In this paper, an improved PBG lattice deviating from square lattice on a microstrip patch antenna is proposed. Both circular and annular ring slots are investigated on the ground plane of patch antenna. The effectiveness of each of the cases is discussed for the suppression of the higher harmonics and surface waves. Antenna performance at resonant frequency of annular ring PBG is compared with circular slotted PBG and conventional patch antenna. Experimental results are also reported to validate the simulated performance.
TL;DR: In this paper, a microstrip antenna aperture coupled to a grounded coplanar waveguide (GCPW) was fabricated on a single layer substrate and studied experimentally and theoretically.
Abstract: Microstrip antennas aperture coupled to a grounded coplanar waveguide (GCPW) have been fabricated on a single layer substrate and studied experimentally and theoretically. Through-plated via holes are used to suppress spurious parallel plate modes. Measurements demonstrate that this antenna element has good performance for both bandwidth and radiation patterns. Calculations using a commercial CAD package are in reasonable agreement with measured data.
TL;DR: In this paper, a dual frequency dual-polarized square microstrip patch antenna with a slot is presented, which offers tunability of the frequency ratio between the two frequencies by adjusting the slot dimensions.
Abstract: A novel dual frequency dual-polarized square microstrip patchantenna embedded with a slot is presented. The proposed antenna offers tunability of the frequency ratio between the two frequencies by adjusting theslot dimensions. This configuration also provides a size reductionup to -51 and 35% for the two modes as compared to a square microstrip patch antenna. ® 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 395-397, 2000.
Patent•
30 May 2000TL;DR: In this paper, an integrable dual-band antenna is described, which consists of an essentially rectangular overall surface that is located over a ground surface, consisting of an L-shaped PIFA antenna for emitting two independent frequencies.
Abstract: The invention relates to an integrable dual-band antenna. Said antenna consists of an essentially rectangular overall surface that is located over a ground surface. Said overall surface consists of an L-shaped PIFA antenna and a rectangular PIFA antenna for emitting two independent frequencies. The PIFA antennae have three or four connections, which are connected by lines to two contact points.
24 Jul 2000
TL;DR: In this paper, a single feed circularly polarized (CP) microstrip antenna for Global Positioning System (GPS) applications is demonstrated, and the Smith charts, axial ratios, and radiation patterns are measured and discussed.
Abstract: A high-permittivity ceramic substrate was used to reduce the microstrip antenna dimension on patch size as compared with conventional low-permittivity substrate. A lossy conductive patch was studied for broadening the bandwidth. Here, experiments of single feed circularly polarized (CP) microstrip antenna for Global Positioning System (GPS) applications are demonstrated. This miniature size of the antenna make it versatile for further application in remote sensing. Results of the Smith charts, axial ratios, and radiation patterns are measured and discussed.
TL;DR: By embedding a pair of U-shaped narrow slots close to the nonradiating edges of a rectangular microstrip patch, a single probe-fed microstrip antenna for broadband operation is proposed in this paper.
Abstract: By embedding a pair of U-shaped narrow slots close to the nonradiating edges of a rectangular microstrip patch, a single probe-fed microstrip antenna for broadband operation is proposed. Measurements show that the antenna bandwidth can be as large as about 2.6 times that of a corresponding conventional rectangular microstrip antenna. Details of the proposed designs are described, and experimental results are presented and discussed. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 369–370, 2000.
TL;DR: In this paper, a slot-loaded trapezoid microstrip antenna with a length ratio of 2.0 and a pair of narrow slots of unequal lengths was proposed to increase the antenna's impedance.
Abstract: An experimental study of a new broadband design of a slot-loaded trapezoid microstrip antenna is presented. The two radiating edges of the trapezoid microstrip patch have a length ratio of 2.0, and a pair of narrow slots of unequal lengths are loaded close to the nonradiating edges of the trapezoid patch. The proposed design can cause a group of three adjacent resonant modes excited in the vicinity of the fundamental resonant mode of the unslotted trapezoid microstrip antenna. This behavior leads to significant enhancement in the antenna's impedance bandwidth. Results show that the proposed new antenna can have an impedance bandwidth greater than three times that of rectangular or circular microstrip antennas. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 24: 16–19, 2000.
16 Jul 2000
TL;DR: In this paper, a dual resonant triangular microstrip antenna with slots-loaded and the characteristics of the isolation between the Tx and the Rx ports using inset microstrip line feed and probe feed methods are proposed and experimentally studied for the case of a thin substrate.
Abstract: As the advances in wireless communication technology are very rapid, there have been vast research in dual fed microstrip antennas in order to isolate the Tx and the Rx signals and for a variable profile dual frequency patch. For example, the study of dual frequency operation has been carried out with the via-hole feed and microstrip line feed. Using a dual resonant microstrip antenna would be better than the broadband microstrip antenna, because it is very difficult that a single layer microstrip antenna has a bandwidth which covers the up- and down-link of the IMT-2000 system. In this article, a dual resonant triangular microstrip antenna with slots-loaded and the characteristics of the isolation between the Tx and the Rx ports using inset microstrip line feed and probe feed methods are proposed and experimentally studied for the case of a thin substrate.