Showing papers on "Folded inverted conformal antenna published in 1987"
TL;DR: The pattern averaging gain (PAG) method to estimate the average gain of mobile antennas in a multipath propagation environment is proposed and the antenna configuration with the PIFA element mounted on the lateral side of the radio case is found to be most suitable for portable radio units.
Abstract: The pattern averaging gain (PAG) method to estimate the average gain of mobile antennas in a multipath propagation environment is proposed. By using this method and a wire-grid model, the radiation characteristics of the planar inverted F antenna (PIFA) mounted on a portable radio case is analyzed. In particular, the variation of the antenna gain with the radio case dimensions and inclination angle of the radio case during operation is clarified. Also, the effect on antenna patterns of the operator holding the portable radio is experimentally investigated. Based on this analysis, the antenna configuration with the PIFA element mounted on the lateral side of the radio case is found to be most suitable for portable radio units. In addition, an appropriate selection of the radio case dimensions is found to result in further improvements in the antenna bandwidth.
239 citations
15 Jun 1987
TL;DR: In this article, the design of a large microstrip antenna array in terms of subarrays consisting of one fed patch and several parasitic patches is discussed and the potential advantages of this design are discussed.
Abstract: Discussed is the design of a large microstrip antenna array in terms of subarrays consisting of one fed patch and several parasitic patches. The potential advantages of this design are discussed. Theoretical radiation patterns of a subarray in the configuration of a cross are presented.
13 citations
9 citations
01 Oct 1987
TL;DR: In this article, an accurate microstrip coaxial feed model is introduced that is valid for substrates of arbitrary thickness and the method of moments is employed using basis functions on each of the patches of the array and on the coax feed probes.
Abstract: An accurate microstrip coaxial feed model is introduced that is valid for substrates of arbitrary thickness. The Method of Moments is employed using basis functions on each of the patches of the array and on the coax feed probes. Special attachment modes are used at the coax/patch junction. Mutual coupling in small arrays is studied.
1 citations
01 Feb 1987
TL;DR: This paper describes the realization of an element supporting two such modes whose resonant frequencies can be made as close to one another as desired.
Abstract: : Microstrip antennas are popular because of their inherent versatility as low profile multifunctional antennas. Their few disadvantages, however, include a narrow frequency bandwidth for single-mode operation. This has led to the development of dual-band elements for dual-frequency operation. To achieve a continuous bandwidth of operation from elements displaying an inherently resonant behavior, however, requires two or more resonant modes capable of producing similar radiation patterns with a similar quality factor. In addition, the feed system must be capable of exciting these modes in a manner that produces a smooth transition between modes (without intervening stop bands). This paper describes the realization of an element supporting two such modes whose resonant frequencies can be made as close to one another as desired.
1 citations
15 Jun 1987