| Section A: Microwave Technology and Related Topics |
| Manuscript Title: Multiband Printed Antenna for Low Frequencies and WLAN Applications |
| Manuscript Id: IJMOT-2006-9-222 |
| Abstract: A compact multi-frequency microstrip antenna suitable for mobile communication systems is presented. The structure consists of three concentric, conductively connected annular rings. The antenna is fabricated in a double dielectric layer substrate, is fed by two probes and operates in more than seven frequency ranges between 0.1 GHz and 3GHz. The design was based on the full wave theoretical analysis of the printed elements. Results obtained by simulation and measuring are presented. |
| Authors: A Manassas,T Kaifas,K Siakavara |
Category: Microwave Technology Submitted On: 4/20/2007 Full Text [PDF] Pg.Nos: 182-186
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| Manuscript Title: Characterization of AC Emitter Current Crowding and Consequences on Small-Signal Extraction |
| Manuscript Id: IJMOT-2007-1-233 |
| Abstract: This paper presents a simple and systematic test that allows assessing the importance of AC emitter current crowding effect in heterojunction bipolar transistors (HBTs). The consequences of this effect on small-signal extraction are accounted for through the generalization of a previously published technique, to an advanced small-signal model. |
| Authors: Louay Degachi, Fadhel M. Ghannouchi |
Category: Microwave Technology Submitted On: 1/26/2007 Full Text [PDF] Pg.Nos: 187-192
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| Manuscript Title: Compact Gap-coupled Microstrip Antennas for Broadband and Dual Frequency Operations |
| Manuscript Id: IJMOT-2007-2-240 |
| Abstract: Microstrip antennas, when divided into two smaller elements, which resonate at the same frequency as the original undivided antenna, and then by suitably gap coupling these divided elements, broadband operation is obtained. In this paper, using this technique, broadband operation is studied and compared for three regular geometries of microstrip antennas viz. rectangle, circle and equilateral triangle. The bandwidth has been increased to more than double as compared to the original patch, keeping the overall size of the antenna nearly the same. Parametric studies for the effect of gap and feed point location, along with radiation characteristics have been investigated. By modifying the resonance frequencies of individual splitted elements, the same configurations are utilized to realize dual frequency response, which has also been investigated in detail. The experiments have been carried out to validate the simulation results. |
| Authors: K. P. Ray, V. Sevani and A. A. Deshmukh |
Category: Microwave Technology Submitted On: 2/28/2007 Full Text [PDF] Pg.Nos: 193-202
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| Manuscript Title: Wideband Dual Posts Waveguide Band Pass Filter |
| Manuscript Id: IJMOT-2007-3-244 |
| Abstract: In This paper the sensitivity analysis and design of the wideband dual post waveguide band pass filter which has been described. The design method is based on insertion loss technique and the calculated results are used to design the certain filter. The simulation results have been validated by measurement s. |
| Authors: M Albooyeh, A A Lotfi Neyestanak, B Mirzapour |
Category: Microwave Technology Submitted On: 9/17/2007 Full Text [PDF] Pg.Nos: 203-209
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| Manuscript Title: Stop Band Characteristics for Periodic Patterns of CSRRs in the Ground Plane |
| Manuscript Id: IJMOT-2007-4-246 |
| Abstract: Stop band filters are designed by etching periodic patterns of complementary split ring resonators (CSRRs) in the ground plane of a microstrip line. CSRRs, being sub-wavelength resonators, their size are much smaller than the conventional microstrip resonators. As a resonator, it has been observed that a single CSRR in the ground plane has a very high Q factor and gives a very low insertion loss in the stop band. It has also been observed that the period of the CSRR loaded microstrip line can be made as small as λ/10 of the operating wavelength thereby extensive size miniaturization is possible. With the increased number of CSRRs etching and decreased period of the periodic structure loaded with CSRRs in the ground plane of the microstrip line, the stop bandwidth increases and side by side the insertion loss level in the mid stop band frequency decreases significantly thereby further enhancing the stop band filter performance along with the extensive size miniaturization. |
| Authors: R. S. Kshetrimayum, S. Kallapudi, S. S. Karthikeyan |
Category: Microwave Technology Submitted On: 4/16/2007 Full Text [PDF] Pg.Nos: 210-215
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| Manuscript Title: Half U-slot loaded Multi-band Rectangular Microstrip Antennas |
| Manuscript Id: IJMOT-2007-5-250 |
| Abstract: Multi-band microstrip antenna is realized by cutting a quarter wavelength or half wavelength slots inside the patch. In this paper, dual and triple band rectangular microstrip antennas, by cutting a quarter wavelength half U-slots inside the patch are proposed. The multi-port network models for these multi-band antennas are also proposed which gives the voltage distributions at all the frequencies. A good agreement between the simulated, multi-port network model and measured results is obtained. |
| Authors: Amit A Deshmukh, K P Ray |
Category: Microwave Technology Submitted On: 9/3/2007 Full Text [PDF] Pg.Nos: 216-221
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| Manuscript Title: Gain and Bandwidth Optimization of Compact UWB Tapered Slot Antennas |
| Manuscript Id: IJMOT-2007-7-258 |
| Abstract: A method is presented which is aimed at increasing the gain and bandwidth of the tapered slot antenna by just finding the optimum tapering profile of the antenna without the need to increase its size. The result of the analysis indicates that a slightly negative tapering gives the optimum gain and bandwidth performance. A positive tapering causes a sharp reduction in the gain and bandwidth, assuming a constant width and length for the antenna. The result of analysis is utilized by designing and manufacturing a tapered slot antenna which has an ultra wideband performance (bandwidth from 3.1 GHz to 10.6 GHz) and a maximum possible gain. The dimension of the antenna is 65 mm × 65 mm. The simulated and measured results show that the antenna covers the 3.1 GHz to more than 11 GHz band with a gain which varies between 4.5 dBi at 3 GHz and 12 dBi at the high frequency band (9-11 GHz). |
| Authors: Amin M. Abbosh |
Category: Microwave Technology Submitted On: 9/6/2007 Full Text [PDF] Pg.Nos: 222-225
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| Manuscript Title: Design of a Compact Ultra Wideband Antenna with Interdigital Resonator for Subband Rejection |
| Manuscript Id: IJMOT-2007-7-261 |
| Abstract: A complete design method for a compact UWB antenna with subband rejection capability is presented. An interdigital resonator is incorporated in the microstrip feeder of the antenna to act as a bandstop filter, hence enabling the rejection of any undesired band within the passband of the antenna. Two samples of the proposed antenna were designed and manufactured. One of the developed antennas does not contain a resonator, whereas the other contains an interdigital resonator. Results of the simulation and measurement show that the designed antennas have a bandwidth from 3 GHz to more than 11 GHz. The results also show that the use of the resonator in the microstrip feeder of the antennas efficiently rejects any undesired subband, such as the 4.9-5.9 GHz band assigned for IEEE802.11a and HIPERLAN/2. The gain of the antennas with resonator is about 2.5 dB at the passband, while it is less than -10 dB at the rejected subband. |
| Authors: Amin M. Abbosh |
Category: Microwave Technology Submitted On: 8/31/2007 Full Text [PDF] Pg.Nos: 226-229
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| Section B: Optical Technology and Related Topics |
| Manuscript Title: Performance Improvement of All Optical WDM Systems on Binary Asymmetric Channel |
| Manuscript Id: IJMOT-2007-2-239 |
| Abstract: In a highly asymmetric channel it may be necessary to correct only the errors result from incorrect transmission. A Long haul incoherent optical multichannel communication systems with EDFAs employing N × N Wavelength Division Multiplexing (WDM) in presence of Stimulated Raman Scattering (SRS) and other receiver noises, including channel beat noise, is analyzed. Error control coding techniques such as Block, RS, Golay and rate 1/2 convolution codes are employed to counter system degradation due to these limiting factors. Without coding BER of 10-9 can be achieved at the maximum of 70 channels while, with coding, it can be achieved beyond 100 channels. In other words the power penalty for 100 channels reduces from 2.6dB to 0.7078dB with coding in presence of both SRS and channel beat noise. |
| Authors: H.S. Mruthyunjaya |
Topic: Optical Technology Submitted On: 8/27/2007 Full Text [PDF] Pg.Nos: 230-235
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| Manuscript Title: Infrared Photoluminescence of Er3+ and Er3+/Yb3+ Doped Epoxy Novolak Resin |
| Manuscript Id: IJMOT-2007-6-252 |
| Abstract: We report about infrared photoluminescence of Epoxy Novalak Resin polymer doped with Er3+ and Er3+/Yb3+ ions. The polymer layers were fabricated by spin coating on silicon, silica on silicon or glass substrates. For erbium and erbium/ytterbium doping anhydrous erbium and ytterbium chlorides or fluorides were dissolved in C5H9NO or C2H6OS and the solutions were added to the polymer. Photoluminescence measurement was done at room temperature by using semiconductor laser P4300 operating at λex= 980 nm with Eex= 500 mW. The samples exhibited the typical emission at 1 530 nm. No effect on the intensity nor the position of the photoluminescence bands caused by addition of ytterbium was observed. |
| Authors: Vaclav Prajzler, Ivan Huttel, Oleksiy Lutakov, Jarmila Spirkova, Jiri Oswald Vitezslav Jerabek |
Topic: Optical Technology Submitted On: 6/13/2007 Full Text [PDF] Pg.Nos: 236-241
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