K. George Thomas, N. C. Lenin · Microwave and Optical Technology Letters · 2008
Abstract A novel high gain printed dipole array antenna for omni directional coverage is presented. The dipoles are electromagnetically fed by planar slots, formed on a 50 Ω microstrip transmission line. The impedance characteristics and radiation patterns of the antenna are analyzed numerically with finite element method and compared with the measurement. The unbalanced feed point of the antenna is fed directly with a small co‐axial cable. The antenna demonstrates good impedance and pattern bandwidth of 300 MHz from 2.25–2.55 GHz and is suitable for ISM band/WLAN operation. The optimum impedance matching can be achieved by increasing the width of the 50 Ω line around the feed point and thereby altering feed point impedance. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1582–1584, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23423
Cited by 6
Williams, D., Brammer, D.J., Royal Signals and Radar Establishment, Malvern (UK) · OpenGrey (Institut de l'Information Scientifique et Technique) · 1981
Cited by 0
M. Sierra‐Pérez, F.L. Heras-Andres, J.A.G. de Lope · IEEE Antennas and Propagation Magazine · 2001
This paper presents the design and antenna-prototype measurements of a low-cost antenna for DECT and LMDS system base stations (3400 to 3600 MHz). The specified pattern must be omnidirectional in the horizontal plane, having a maximum at the horizon. To produce this pattern, a linear array of printed patches, placed on both sides of a planar feeding structure, is designed The feeding structure is a symmetrical stripline, made with low-cost materials and designed to simplify the implementation tasks as much as possible.
Cited by 4Open access
Subba Rao Chalasani, Madhavi Devi L, Swati Lakshmi B · International Journal of Engineering Trends and Technology · 2021
Cited by 1
Guiping Jin, Li Huang, Shaowei Liao · 2022
This paper presents a monopulse substrate integrated waveguide (SIW) collinear slot antenna array at X-band. The collinear slot structure is realized by alternately moving the waveguide wall corresponding to each slot to disturb the electric field inside the waveguide, which effectively reduces the cross-polarization. As for the design of the monopulse feeding network, different from the traditional magic-T structure, this paper realizes the transformation of the sum-difference beam through the microstrip slot coupling feeding structure, which reduces the volume and profile of the antenna. This type of monopulse antenna features low cross-polarization, low profile, easy integration, wideband, and high gain performance.
Cited by 1
Ryan Daly, Wayne S. T. Rowe, Kamran Ghorbani · Electronics Letters · 2011
An innovative approach to the design of a centre-fed omnidirectional collinear array for use in the 900 MHz band is presented. The coplanar printed circuit realisation using a combination of the CPW and coplanar strips is shown to be very effective in eliminating beam tilt with change in frequency. Both measured and simulated results confirm less than 1.5° of beam tilt in the omnidirectional pattern with an azimuth ripple of approximately +/−0.7 dB, over an impedance bandwidth of greater than 10%.
Cited by 2
Zaharias D. Zaharis, E. Vafiadis, John N. Sahalos · Electromagnetics · 1998
ABSTRACT The arrangement of a Mast-mounted folded dipole antenna array with corner reflectors is considered. The method of moments (MoM) in a wire grid model is used and a suitable optimization procedure is applied Due to the constraints for high power gain and low SLL the array is designed as a simple broadside Chebyshev one. The presence of 120° corner reflectors change the pattern and makes the array to be a Hybrid-Chebyshev one with approximately the same SLL. The distance of the array from the corner of the reflector is critical for the HPBW. Two different types of antennas with 60° and 120° HPBW in the horizontal plane for possible mobile applications are studied.The whole design work is given in a general form, useful for VHF and UHF communication applications. To ensure the accuracy, two different wire grids for each model are used. In the examples several interesting cases will be analytically presented.
Cited by 0
Daly, R, Rowe, W, Ghorbani, K · RMIT Research Repository (RMIT University Library) · 2011
An innovative approach to the design of a centre-fed omnidirectional collinear array for use in the 900 MHz band is presented. The coplanar printed circuit realisation using a combination of the CPW and coplanar strips is shown to be very effective in eliminating beam tilt with change in frequency. Both measured and simulated results confirm less than 1.58 of beam tilt in the omnidirectional pattern with an azimuth ripple of approximately +/20.7 dB, over an impedance bandwidth of greater than 10%.
Cited by 0
Qiang Wang, Xiaolin Yang, Yantao Li et al. · 2011 International Conference on Computational Problem-Solving (ICCP) · 2011
A high-gain and low-sidelobe coaxial collinear (COCO) array antenna is developed in the UHF band. The bandwidth of the array element reaches to 5.8% and the gain is 6.054dB. To suppress the grating lobes, a new method of spacing array element is considered and confirmed. A 42×15 coaxial collinear array antenna is designed with this method. The grating lobes of the array is down to -30dB. The gain of finally array is 38dB, sidelobe level is less than -30dB, the Half-Power Beam Width (HPBW) is 2.16 degrees in E-plane, and 2.12 degrees H plane.
Cited by 5
Charles C. H. Tang · 1954
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K. Iwamoto, Mikko Heino, Katsuyuki Haneda et al. · IEEE Transactions on Antennas and Propagation · 2018
Single-frequency full-duplex (SFD) wireless communication can increase the efficiency of bandwidth utilization by ideally doubling the spectral efficiency. SFD can be achieved by reducing the level of the self-interference between the transmitter (TX) and receiver (RX) to the RX noise floor. This communication describes a novel decoupling structure to increase the isolation for a collinear dipole array which retains the omnidirectional radiation patterns of the dipole antennas. The structure is based on a parasitic element which couples power from the TX antenna and reradiates it with orthogonal polarized elements canceling the original field around the RX antenna. A novel analysis is presented for the decoupling structure in which the phase and amplitude radiation pattern of the decoupling structure is calculated. The obtained isolation is more than 50 dB according to the simulation and measurement results for a bandwidth of 11%, fulfilling the required electromagnetic isolation for a full-duplex system in indoor device-to-device communications.
Cited by 63
G. K. Mahanti, A. Chakrabarty, S. Das · 2008
In this paper, the authors propose a technique based on real-coded Genetic Algorithm (GA) for optimal design of reconfigurable dual-beam collinear halfwavelength dipole antenna arrays with phase-only control of discrete phase shifters. The problem is to find a common amplitude distribution that will generate a pencil beam with zero phases and a flat-top beam with discrete phases of a six-bit discrete phase shifter. Key words: Dual-beam, reconfigurable arrays, genetic algorithms, phased array, dipole antennas, array synthesis. 1.
Cited by 0
Defense Technical Information Center · Bulletin of Miscellaneous Information (Royal Gardens Kew) · 1954
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Yanzhong Yu, Han Huang, Shunda Lin et al. · Journal of Optics · 2019
Abstract An optimization-free approach is proposed for generating optical needle and bright spot arrays with controllable distributions. This is achieved by inversely focusing the radiation pattern from a collinear antenna array whose elements are placed along an optical axis and whose currents in each element also flow along that direction, situated at the focus of a 4pi configuration. The shape and central location of the n th focusing field only depend on the length l n and coordinate z n of the n th element in collinear array, respectively. The number of focal fields is determined by the number of elements in the array.
Cited by 11
Fahroni Ardiansyah, Sudi Mariyanto i Al Sasongko, Abdullah Zainuddin · 2018
Antena collinear merupakan rangkaian antena dipole yang dirangkai menjadi satu kesatuan sistem antenna. Penyusunan antenna dipole ini dalam suatu rangkaian akan membangkitkan penguatan gain. Antena mikrostrip merupakan antena yang mempunyai karakteristik yang kecil, ringan dan tipis sehingga menyebabkan antena ini semakin dikembangkan untuk aplikasi wireless LAN.
Antena yang diaplikasikan diluar ruangan harus memiliki gain ≥15 dB. Untuk mencapai hal ini antena tunggal bisa disusun secara array. Karena dengan menyusun anena array diharapkan memilikigain yang besar. Pada dasarnya, jumlah antena tunggal dalam suatu susunan array tidak terbatas, tetapi faktor dimensi antena juga harus menjadi pertimbangan.
Kata kunci :collinear, collinear mikrostrip, array
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Yaqi Liu, Yaxin Li, Di Wu · 2024
In this paper, a method using a collinear array to suppress the zenith directional radiation for simultaneous transmit and receive (STAR) antennas is proposed. At first, the principle of pattern multiplication is introduced to analyze the operation mechanism of the antenna. Then, two collinear array examples, based on mode orthogonality and near-field cancellation STAR antenna units, spaced at half a wavelength apart, are introduced for verification. Results show that this collinear array configuration successfully reduces radiation in the undesired zenith direction of the sequentially rotated array (SRA) mode, achieving good omnidirectional Co-horizontally polarized (HP) and Co-vertically polarized (VP) radiation. Moreover, it substantially improves the realized gain of the STAR antenna in the azimuthal plane without adversely affecting its reflection coefficients and isolation.
Cited by 0
Milan Polívka, Alois Holub · 2007
The paper summarizes collinear principle (CollP) used for the design of enhanced directivity collinear arrays (CollAr) flrst. Various types of collinear arrays starting from histor- ical wire design introduced by Franklin, going through coaxial collinear arrays as far as to the most recent CollAr implemented in microstrip line and patch technology are mentioned. Fur- ther supplementary principle of parallel line up arrangement of in-phase current sources to form coparallel array (CopAr) in presented. Two examples of CopAr based on planar extension of collinear microstrip patch antenna (PCoMPA) and branched F-type antenna are described in more details.
Cited by 4
V. A. Yatskevich, E.N. Bulikov · 2003
Synthesis of collinear antenna array is presented in order to improve radiation pattern in vertical plane.
Cited by 0
Md. Rashidul Islam, Mohammod Ali · 2012
This paper presents the study and design of a 5.2 GHz WLAN body-wearable electronically steerable parasitic antenna radiator (ESPAR) array. A collinear array of four driven dipoles and eight parasitic dipoles is formed to attain beam steering in the azimuth plane and a narrow beam in the elevation plane. The collinear ESPAR array provides beam steering in three directions while allowing 12.8 dBi of peak gain at 5.2 GHz. PIN diode switches are used to control the beam of the array.
Cited by 4
G.K. Mitropoulos, Rodoula Makri, M. Gargalakos et al. · DSpace - NTUA (National Technical University of Athens) · 2004
A novel printed antenna array has been designed and simulated for the needs of a node antenna for point-to-multipoint, PMP, radio links, operating at 26GHz. The antenna array elements are derived from the concept of the Marconi-Franklin collinear array. Each array element is being fed by two parallel transmission lines via an under ground plane of approximately 3/spl lambda//sub 26GHz//2 /spl times/ 3/spl lambda//sub 26GHz//2 mm/sup 2/. Following extensive simulations the radiation pattern of each array element was extracted concluding in an almost 8dB directivity with a 75% efficiency.
Cited by 2Open access