Now showing items 1-20 of 25
Next PageURI: | http://dyuthi.cusat.ac.in/purl/1583 |
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Circularly pola ... act microstrip antenna.PDF | (1.230Mb) |
Abstract: | compact microstrip antenna integrated with an amplifier having an area reduction of 70%, compared to the standard circular microstrip patch antenna, is presented. The antenna also provides an enhanced gain of 10-dB more than its passive counter part. The measured 2:1 VSWR band width is -4% at 790 MHz, which is 2.5 times larger than that of the passive microstrip antenna |
URI: | http://dyuthi.cusat.ac.in/purl/1402 |
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Compact amplifi ... ted microstrip antenna.PDF | (933.7Kb) |
Abstract: | The design and implementation of a novel asymmetric coplanar waveguide (ACPW ) band rejection filter using defected ground structure ( DGS) is presented . The proposed ACPW DGS technology provides band gap characteristics with only one cell in the lateral ground plane . The equivalent circuit model of the proposed DGS unit section is described . Measurements of ACPW DGS showed good agreement with simulation and the proposed model |
URI: | http://dyuthi.cusat.ac.in/purl/1358 |
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Compact asymmetric coplanar waveguide filter.PDF | (576.9Kb) |
Abstract: | A novel design of a computer electronically reconfigurable dual frequency dual polarized single feed hexagonal slot loaded microstrip antenna in L-band is introduced in this chapter. pin diodes are used to switch the operating frequencies considerably without much affecting the radiation characteristics and gain. the antenna can work with a frequency ratio varying in the wide range from 1.2 to 1.4. the proposed design has an added advantage of size reduction up to 72.21% and 46.84% for the two resonating frequencies compared to standard rectangular patches. the design also gives considerable bandwidth of up to 2.82% and 2.42 % for the operating frequencies. |
URI: | http://dyuthi.cusat.ac.in/jspui/handle/dyuthi/1555 |
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Dyuthi-P00409.pdf | (863.5Kb) |
Abstract: | An arrow-shaped microstrip antenna with a pair of narrow slots embedded near the non-radiating edges gives wide impedance bandwidth. The experimental and simulated (!E3D) results show that antenna bandwidth is -3.5 times that of a conventional patch with the added advantage of reduced antenna size. The radiation characteristics are found to he uniform throughout the operating band |
URI: | http://dyuthi.cusat.ac.in/purl/1398 |
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compact microst ... or broadband operation.PDF | (966.4Kb) |
Abstract: | Propagation of electromagnetic waves through a microstrip line with 2D electromagnetic baud gap (EBG) structures of different geometrical shapes in the ground plane is investigated in this paper. Using transmission-line theory, the design equations for EBG structures are calculated. The measured, numerical. and simulated results are in gone) agreement |
URI: | http://dyuthi.cusat.ac.in/purl/1422 |
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Design and anal ... ent geometrical shapes.PDF | (923.1Kb) |
Abstract: | The design, erection and evalution procedures for it microwave anechuic chamber competed at Cochin University for antenna studies are presented the chamber has an average reflectivity level of - 32 dB on at X-band frequencies, and it i, comparable to international standards. |
URI: | http://dyuthi.cusat.ac.in/purl/1434 |
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Design,developm ... rowave antenna studies.PDF | (1.493Mb) |
Abstract: | A new design for a compact electronically reconffgurable singlefeed dual frequency dual-polarized operation of a square-microstrip antenna capable of achieving tunable frequency ratios in the range 1.1 to 1.37 is proposed and experimentally studied. Varactor diodes inlegruted with the arms of the hexagonal slot and embedded in the square patch are used to tune the operating frequencies by applying reverse-bias voltage. The design has the advantage of size reduction up to 73.21% and 49.86% for the two resonant frequencies, respectively, as compared to standard rectangular patches. The antenna offers good bandwidth of 5.74% and 5.36% for the two operating frequencies. A highly simplified tuning circuitry without any transmission lines adds to the compactness of the design |
URI: | http://dyuthi.cusat.ac.in/purl/1424 |
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Development of ... ble microstrip antenna.PDF | (1.614Mb) |
Abstract: | Experimental studies on a compact dual frequency microstrip antenna are presented. This antenna configuration provides an area reduction of 40% compared to a standard rectangular antenna operating at the same frequency without much degradation of the gain. The antenna structure can be modified to achieve the desired ratio between the two resonant frequencies |
URI: | http://dyuthi.cusat.ac.in/purl/1375 |
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Dual-band dual- ... act microstrip antenna.PDF | (907.1Kb) |
Abstract: | A new design of' a dual-frequency dual-polarized square microsh'ip antenna fed along the diagonal, embedded with a square slot having three extended stubs for frequency tuning, is introduced. The proposed antenna was fabricated using a standard photolithographic method and the antenna was tested using the HP 3510(:; Vector Network Analyser. The antenna is capable of generating dual resonant frequencies with mutually perpendicular polarizations and broad radiation pattern characteristics. Such dual-frequency designs find wide applications in personal mobile handsets combining GSM and CDS 1800 modes, and applications in which different frequencies are used for emission and reception such as personal satellite communications and cellular network systems. |
URI: | http://dyuthi.cusat.ac.in/purl/1397 |
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Dual-frequency ... r communication system.PDF | (2.098Mb) |
URI: | http://dyuthi.cusat.ac.in/purl/1351 |
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Dual frequency miniature microstrip antenna.PDF | (807.9Kb) |
Abstract: | A theoretical analysis of a symmetric T-shaped rnicrostripfed rectangular microstrip antenna using the finite-difference titnedoniain (FDTD) method is presented in this paper. The resonant frequency, return loss, impedance bandwidth, and radiation patterns are predicted and are in good agreement with the measured results |
URI: | http://dyuthi.cusat.ac.in/purl/1408 |
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FDTD analysis o ... lar microstrip antenna.PDF | (850.6Kb) |
Abstract: | Electromagnetic scattering behaviour of a superstrate loaded metallo– dielectric structure based on Sierpinski carpet fractal geometry is reported. The results indicate that the frequency at which backscattering is minimum can be tuned by varying the thickness of the superstrate. A reduction in backscattered power of 44 dB is obtained simultaneously for both TE and TM polarisations of the incident field. |
URI: | http://dyuthi.cusat.ac.in/purl/675 |
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Frequency tunab ... ering reduction Anupam.pdf | (205.4Kb) |
Abstract: | A novel technique for backscattering reduction for both TE and TM polarisation, employing a metallo-dielectric structure based on Sierpinski carpet fractal geometry, is reported. A reduction in backscattered power of --30 dB is obtained for normal incidence in the X-band for the structure using the third iterated stage of the fractal geometry |
URI: | http://dyuthi.cusat.ac.in/purl/1406 |
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Low backscatter ... d on sierpinski carpet.PDF | (1.096Mb) |
Abstract: | This paper presents the outcome of the experimental studies performed on L-strip fed compact rectangular microstrip antenna. The effect of the feed parameters upon the characteristics of the antenna is studied in detail. The antenna offers an impedance bandwidth of nearly 20% and is suitable for broadband applications |
URI: | http://dyuthi.cusat.ac.in/purl/1412 |
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L-strip excited ... lar microstrip antenna.PDF | (898.2Kb) |
Abstract: | Development of a new type of microwave absorbing material using rubber latex and carbon. for application in the interior lining of anechoic chambers, has been reported. Absorption coefficients of different combinations were estimated at X and S bands and the results were presented graphically. A combination of 50% rubber latex, 40% carbon and 10% graphite is found to form an ideal microwave absorbing material in the X and s bands |
URI: | http://dyuthi.cusat.ac.in/purl/1429 |
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Microwave absor ... using rubber & carbon.PDF | (777.8Kb) |
Abstract: | An innovative phaseshifterless, wideband, micrustrip leaky-wave antenna with an electronically steerable dual-pencil-beam pattern in the H-plane is presented. The log-periodic geometry of the leaky slots of the antenna results in a wide bandwidth of 25.19%. The Jan beam can he steered up to 14° over the wide resonating band of the anteww. The beam is also steerable at a fixed frequency. by reactivelty loading the slots and a maximum steering angle of about 14° is ohserved. for different capacitor values with an improved bandwidth of 33 _i%. This concept is studied using passive components but it can be extended to varactors |
URI: | http://dyuthi.cusat.ac.in/purl/1418 |
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A novel electro ... dic leaky-wave antenna.PDF | (931.7Kb) |
Now showing items 1-20 of 25
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