Simultaneous transmit and receive antenna
US5038151A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1989 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Jul 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/525
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A stationary, lightweight, easily transportatable antenna capable of full duplex operation, i.e., portions of the antenna can transmit and receive simultaneously in the same frequency band. The antenna has a near omnidirectional pattern in the azimuth plane for both transmit and receive. The receive portion (2) consists of four antenna elements (20), each having a beamwidth in the azimuth plane slightly greater than 90.degree.. The receive antennas (20) are arranged symmetrically about a midpoint (93) that lies in the azimuth plane. The beams of the four receive antennas (20) face outwardly away from the midpoint (93) and thereby cover the full azimuth plane. The transmit portion (1) of the antenna is a colinear set of dipole elements (12) arranged within a cylinder (11) that is orthogonal to the azimuth plane and centered on said midpoint (93). A nulling circuit (3) intrinsic to the receive portion (2) provides further isolation between transmit and receive, by means of phasing geometrically opposing receive antennas (20) 180.degree. out-of-phase with respect to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.