A Multistandard Antenna Based on a 2-D CRLH-TL in Polar Coordinates
نویسندگان
چکیده
A novel 2-D composite right/left-handed transmission line (CRLH-TL) metamaterial in polar coordinates is proposed for the first time, and applied to a multistandard antenna. The prototype antenna with triband operation colocated pattern polarization diversity specifically designed eliminate need multiple antennas processing center side significantly reduce area cost. Radial CRLH-TL waves of mode type 0 1 are simultaneously excited by port 1, working 2.5 GHz Industrial, Scientific, Medical (ISM) band 3.3 WiMAX band, respectively. Annular -1 +1 2, covering 915 MHz RFID ISM modes r-direction result omnidirectional patterns due circular symmetry. ?-direction directional patterns, thanks aperture-coupled feeding topology.
منابع مشابه
task-based language teaching in iran: a mixed study through constructing and validating a new questionnaire based on theoretical, sociocultural, and educational frameworks
جنبه های گوناگونی از زندگی در ایران را از جمله سبک زندگی، علم و امکانات فنی و تکنولوژیکی می توان کم یا بیش وارداتی در نظر گرفت. زبان انگلیسی و روش تدریس آن نیز از این قاعده مثتسنی نیست. با این حال گاهی سوال پیش می آید که آیا یک روش خاص با زیر ساخت های نظری، فرهنگی اجتماعی و آموزشی جامعه ایرانی سازگاری دارد یا خیر. این تحقیق بر اساس روش های ترکیبی انجام شده است.پرسش نامه ای نیز برای زبان آموزان ...
Tunable Bandpass Filter with Varactors Based on the CRLH-TL Metamaterial Structure
This paper presents a tunable bandpass filter based on the varactor-loaded composite rightand left-handed transmission line (CRLH-TL). The proposed filter is composed of one CRLH-TL unit cell, which corresponds to the third-order bandpass filter. The tunable bandpass filter is designed using only lumped-elements. The use of lumped elements saves space and lowers the fabrication cost. The size o...
متن کاملDiversity Monopulse Antenna Based on a Dual-frequency and Dual Mode Crlh Rat- Race Coupler
A diversity monopulse antenna is presented in this paper. This monopulse antenna is based on a dual frequency dual mode ratrace coupler that has been designed by using Composite Right/Left Handed (CRLH) Transmission Lines (TL). The device has two input ports while the (Σ) and (Δ) outputs are interchangable at either of the two operating frequencies. In this way the monopulse antenna can work at...
متن کاملDesigns of True-Time-Delay Lines and Phase Shifters Based on CRLH TL Unit Cells
Electromagnetic (EM) Metamaterials have specific EM properties that cannot be found in nature (Caloz & Itoh, 2006). These specific EM properties are obtained by the artificial structures, rather than the composition of the metamaterials, and affect the propagations of EM waves when the average structure sizes are much smaller than the guided wavelengths ┣g, i.e., at least smaller than ┣g/4. Sin...
متن کاملa study on rate making and required reserves determination in reinsurance market: a simulation
reinsurance is widely recognized as an important instrument in the capital management of an insurance company as well as its risk management tool. this thesis is intended to determine premium rates for different types of reinsurance policies. also, given the fact that the reinsurance coverage of every company depends upon its reserves, so different types of reserves and the method of their calc...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: IEEE Antennas and Wireless Propagation Letters
سال: 2021
ISSN: ['1548-5757', '1536-1225']
DOI: https://doi.org/10.1109/lawp.2021.3049504