Compact Corrugated Feedhorns With High Gaussian Coupling Efficiency and $-60\;\text{dB}$ Sidelobes
| Autor: | Peter J. Speirs, Robert I. Hunter, Graham Smith, Duncan A. Robertson, Richard Wylde, Johannes McKay |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Coupling business.industry Gaussian Bandwidth (signal processing) 020206 networking & telecommunications 02 engineering and technology Lambda 01 natural sciences Phaser Directivity Computational physics symbols.namesake Optics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering symbols Coupling efficiency Electrical and Electronic Engineering business 010303 astronomy & astrophysics Excitation |
| Zdroj: | IEEE Transactions on Antennas and Propagation. 64:2518-2522 |
| ISSN: | 1558-2221 0018-926X |
| DOI: | 10.1109/tap.2016.2543799 |
| Popis: | We demonstrate that very high performance, extremely compact, scalar corrugated feedhorns can be designed and constructed by optimizing the excitation and phasing of the ${\rm HE}_{11}$ , ${\rm HE}_{12}$ , and ${\rm HE}_{13}$ modes near the throat of the horn while limiting excitation of higher order modes. We present the design and measurement of two families of dual-profiled horn, both with a directivity of 20 dBi that couple with very high efficiency to a fundamental Gaussian mode. The first was optimized for sidelobe performance and features sidelobes approaching $-$ 60 dB for a horn length of only 15.6 ${\lambda}$ . The second was designed to minimize horn length and to achieve sidelobe levels below $-35\;\text{dB}$ for a horn that is only 4.8 ${\lambda}$ long. The horns exhibit excellent coupling to the fundamental free-space Gaussian mode, with ${\rm LG}_{00}$ power coupling of 99.92% and 99.75%, respectively. We demonstrate excellent agreement between simulation and experiment at 94 GHz and simulate the performance over a 20% bandwidth. High-performance compact scalar horns are of interest because they reduce manufacturing risk at high frequencies, and reduce size and weight at lower frequencies, which can be important in horn arrays and space applications, where horn arrays often have serious weight and size restrictions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|