Antenna assembly
US5313218A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1992 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Oct 15, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/265
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna assembly includes a dipole antenna (D1, D2) and a monopole antenna (C1) having substantially perpendicular polarization directions. The dipole antenna (D1, D2) is provided with a balun (E1, E2) a portion (E1) of which serves as a backplane for a microstrip transmission line (G0, G1, G2) which transmits RF signals. The microstrip transmission line includes a first portion (G0) connected to a coaxial feed cable (F), a second portion (G1) having its ends respectively connected by a first switch (A) to the monopole antenna (C1) and a second switch (B) to the balun portion (E1) and a third portion (G2). When the switches (A, B) are closed to render the monopole antenna (C1) operative, the third portion (G2) serves to detune the dipole antenna (D1, D2). The assembly may be formed as a two-sided printed circuit board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.