Now showing items 21-29 of 29
| Abstract: | A simple technique for calculating the resonance frequencies of a compact arrow-shaped microstrip antenna is presented and discussed . The accuracy of the method is validated by experimental results |
| URI: | http://dyuthi.cusat.ac.in/purl/1353 |
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| Resonance frequ ... act microstrip antenna.PDF | (701.4Kb) |
| Abstract: | The arrow shaped microstrip antenna, which produces dual frequency dual polarisation operation with considera-ble size reduction compared to conventional patches has been reported [I]. These antennas provide greater area reduction and improved gain compared to drum shaped patches [2]. Prediction of the resonance frequency of drum shaped patches [3] and circular patches for broadband operation [4] are available in the literature. In this Letter, we propose empirical formulas for calculating the resonance frequencies of the arrow shaped microstrip antenna. These antennas can be employed for obtaining dual frequency with the same polarisation, bandwidth enhancement, circular polarisation etc. by varying its different parameters or by introducing slots. The proposed design equations provide an easier and simple way of predicting the resonant frequencies of these patches. |
| URI: | http://dyuthi.cusat.ac.in/purl/671 |
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| Resonance frequ ... crostrip antenna Manju.pdf | (357.4Kb) |
| Abstract: | A dual-port microstrip antenna with a crescent shaped patch with excellent isolation betwecn the ports has been reportcd [I]. Since circular-sided geometries are inore compact than rectangular oncs, thcy find morc applications in microstrip arrays. The crcscent shaped antenna geometry [ I ] provides greater area rcductioii compared to other circular sided patches for broadband operation [2]. In this Lctter, formulac for calculating thc TM, I and TMZI mode resonant frequencies of this microstrip antenna, obtained by modifying the equations of a standard circular patch [3] are presentcd. Thcorctical results are compared with experimental observations aid the validity of the computation is established. |
| URI: | http://dyuthi.cusat.ac.in/purl/670 |
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| Resonant freque ... icrostrip antenna Sona.pdf | (217.3Kb) |
| Abstract: | A novel dual frequency design of a square microstrip antenna coaxially fed along the diagonal with a chip capacitor mounted at the bottom of the stub is introduced. This design provides enhanced area reduction and good cross-polarization levels. The antenna design can be used as a compact antenna system where limited size is a major requirement. The details of the antenna design and experimental results are presented |
| URI: | http://dyuthi.cusat.ac.in/purl/1382 |
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| Slot coupled sq ... al-frequency operation.PDF | (1.351Mb) |
| Abstract: | Dual frequency operation is achieved from a compact microstrip antenna by loading a pair of narrow slots close to its radiating edges. The two frequencies have parallel polarization planes and similar radiation characteristics. The ratio between the two operating frequencies can be tuned in the range (1.14-1. 24), which is much smaller than that of similar designs. The above excellent radiation characteristics are achieved along with an area reduction of - 75% compared to the standard rectangular patch |
| URI: | http://dyuthi.cusat.ac.in/purl/1378 |
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| Slot-loaded com ... al-frequency operation.PDF | (1.081Mb) |
| Abstract: | In this paper, we introduce a novel feeding technique for bandwidth enhancement of a rectangular microstrip antenna This antenna offers an impedance bandwidth of 22% without degrading the effciencv. The effect of the feed parameters upon patch characteristics such as resonant frequency, impedance bandwidth, and radiation pattern are studied in detail. The experimental results are verified using the FDTD results |
| URI: | http://dyuthi.cusat.ac.in/purl/1415 |
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| Wideband micros ... using hook-shaped feed.PDF | (1.285Mb) |
| Abstract: | The design and development of an L-band printed dipole antenna. optimized for wide-band applications near first resonance, is reported. This design has achieved more than 48% impedance bandwidth (VSWR 2:1), without degrading its overall radiation efficiency |
| URI: | http://dyuthi.cusat.ac.in/purl/1363 |
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| WIDE-BAND PRINTED DIPOLE ANTENNA.PDF | (1.256Mb) |
| Abstract: | An electromagnetically coupled T-shaped microstrip feed used to enhance the impedance bandwidth of a rectangular microstrip antenna is reported. The proposed antenna offers a 2:1 VSWR bandwidth of -36% with an increase in gain of 0.8 dB |
| URI: | http://dyuthi.cusat.ac.in/purl/1400 |
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| A wideband rect ... ymmetric t-shaped feed.PDF | (804.7Kb) |
| Abstract: | A trapezoidal strip grating surface that eliminates specular reflections almost over the entire X -band frequency range for TM polarization is reported This new grating structure overcomes the bandwidth limitation of conventional rectangular strip grating surfaces |
| URI: | http://dyuthi.cusat.ac.in/purl/1348 |
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| Wideband trapez ... of specular reflection.PDF | (808.9Kb) |
Now showing items 21-29 of 29
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