Effects of a high-impedance screen on a dipole antenna

Autor:	R.C. Hansen
Rok vydání:	2002
Předmět:	Physics business.industry Phase angle Phase (waves) Input impedance Mismatch loss Radiation pattern law.invention Dipole Optics law Dipole antenna Electrical and Electronic Engineering Reflection coefficient business
Zdroj:	IEEE Antennas and Wireless Propagation Letters. 1:46-49
ISSN:	1548-5757 1536-1225
DOI:	10.1109/lawp.2002.805121
Popis:	A high-impedance conductor with reflection coefficient magnitude near unity and appropriate phase would allow a parallel dipole to be closely spaced to the screen. Phase is critical; this paper examines the pattern, gain, and impedance properties of a dipole antenna located close to a high-impedance material. The material is idealized with a unity reflection coefficient and a variable phase angle from -/spl pi/ to +/spl pi/. An example uses a half-wave dipole-spaced wavelength from the material. For a phase angle around 135/spl deg/ the pattern is unstable and has a null at broadside. Gain varies from 10 to 0 dB. Input impedance varies widely with phase angle, presenting a mismatch loss situation. From these data an acceptable range of phase angle verses frequency can be inferred.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c2e3baee79504049f2b79fca3131d074 https://doi.org/10.1109/lawp.2002.805121 Zobrazit plný text záznamu