Precise Admittance of a Monopole.

PDF Version Also Available for Download.

Description

The purpose of this paper is to obtain the admittance of a monopole antenna to a higher degree of accuracy than has heretofore been reported in the literature. The model selected for analysis consists of a base-driven monopole of arbitrary dimensions (length and radius) protruding perpendicularly from an infinite ground plane. The transmission line providing the excitation is a coaxial cable with outer sheath truncated at ground level. The problem is solved by obtaining the admittance of the monopole of finite length for TEM excitation alone from an integral equation for the current that has a solution. The requisite information ... continued below

Physical Description

Pages: 45

Creation Information

Chang, D. C. & Harrison, C. W., Jr. August 30, 1968.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Publishers

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

The purpose of this paper is to obtain the admittance of a monopole antenna to a higher degree of accuracy than has heretofore been reported in the literature. The model selected for analysis consists of a base-driven monopole of arbitrary dimensions (length and radius) protruding perpendicularly from an infinite ground plane. The transmission line providing the excitation is a coaxial cable with outer sheath truncated at ground level. The problem is solved by obtaining the admittance of the monopole of finite length for TEM excitation alone from an integral equation for the current that has a solution. The requisite information needed to modify this admittance to incorporate the localized cable-monopole junction or feedpoint effect is obtained from the solution of two ancillary problems. One of these problems consists of deriving an expression for the apparent admittance of an infinite monopole considering the TEM and higher order modes of type TM {sub on} (n=1,2,...) set up in the coaxial cable by the sheath discontinuity. In essence, this involves solving an integral equation for a function equal to the integral of the electric field across the feedpoint gap. The other supplementary problem requires finding the admittance of an infinite monopole for TEM excitation alone. This is achieved by suitably modifying the integral equation for determining the admittance (for TEM excitation) of the finite structure. Extensive numerical results in tabular and graphical form are provided in the paper. TM {sub on} modes in the coaxial cable to n = 400 are included in the admittance data. (auth)

Physical Description

Pages: 45

Notes

Dep. CFSTI.

Source

  • Other Information: UNCL. Orig. Receipt Date: 31-DEC-70

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Report No.: SC-R--68-1888-A
  • Grant Number: None
  • DOI: 10.2172/4731682 | External Link
  • Office of Scientific & Technical Information Report Number: 4731682
  • Archival Resource Key: ark:/67531/metadc1034718

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this report?

When

Dates and time periods associated with this report.

Creation Date

  • August 30, 1968

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

Description Last Updated

  • Jan. 20, 2018, 12:35 a.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Chang, D. C. & Harrison, C. W., Jr. Precise Admittance of a Monopole., report, August 30, 1968; United States. (digital.library.unt.edu/ark:/67531/metadc1034718/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.