Abstrakt

Development of Microstrip Patch as HDTV Antenna for Terrestrial Indoor TV Reception

Michael Olusope Alade, Olusegun Olabisi

This paper presents design, construction and analysis 4 by 2 corporate fed circular patches as High Definition Television (HDTV) antenna configuration for Ultra High Frequency (UHF) indoor reception. The single element was designed based on transmission line method. The single element radiation pattern is omnidirectional with high beamwidth of about 6dB and low gain of about2dBi which are poor for UHF television reception. As a result, single element patch was optimized to achieve 8elements which was arranged in 4 by 2 corporate fed circular patches as HDTV antenna configuration. By calculation, the 4 by 2 corporate fed circular patches antenna produced directional radiation pattern of low beamwidth of about 3dB and high gain of about 9dBi. The antenna was then fabricated by depositing resin of relative permittivity of 4.5 and thickness of 0.2cm using wet etching technique on un-galvanized aluminium of radius 2cm. The antenna‟s gains in passive and active modes were measured by Gain – Comparison Technique (GCT) with the aid of GSP 810 Spectrum Analyzer. The results obtained show that the peak gain at various frequencies in passive and active modes were 9, 8.83, 9, 8.99, 8.97dBi, at 487.6, 497.9, 531.4, 549.7, 566.9MHz, and 9.62, 11.23, 9.20, 8.99,8.97,9.09dBi, at 480.3, 499.1, 531.6, 549.7, 566.9,588.6MHz respectively.