Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1990-07-18
1992-10-13
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Plural separate diverse type
343726, 343727, 343728, H01Q 2100
Patent
active
051554950
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to antennas for the transmission and reception of radio waves for telecommunications, broadcasting sound and television, radar, satellite communications and the like.
Known antennas usually have a single feeder connected to either a single conductor element of approximately half a wavelength, or to a single driven element within a group of parasitic elements as in the Yagi-Uda array. By means of added reactive components such as inductors, end capacitors, resonant traps and such, antennas have been constructed with somewhat smaller dimensions than the basic half wavelength element. Loop antennas are also known and are useful in direction finding. However most antennas of reduced dimensions have disappointing transmission efficiency due to the necessarily increased circulation currents which cause large conductor losses and or magnetic core losses.
BACKGROUND ART
The Poynting Theorem states that for any superimposed electric and magnetic fields there must be energy flowing in the medium and thus the phenomenon of radio wave propagation has been explained in the presently accepted theory as the radiation of electromagnetic energy in the form of an electric field E and a magnetic field H in a cross-product Poynting vector E.times.H=S watts per meter squared. The perpendicular geometric relationship and the time synchronism implied by the above formula must be produced by any antenna which is to radiate efficiently. Presently known antennas are probably achieving the requirements in an uncontrolled or accidental manner.
Due to extended physical dimensions and high location above the ground, it is probable that there is fortuitously provided in the large volume of space a means of setting the necessary perpendicularity and simultaneity as well as a degree of rotationality for the fields, although the absence of these conjectures from the present texts ought not to be used to condemn the validity of the concept. From the large surrounding and lightly stressed volume the comparatively weak Poynting vector progresses outwards to infinity.
THE INVENTION
In accordance with one aspect of the invention a radio antenna in which electromagnetic waves are radiated from a small volume comprises two first and second separate element systems respectively excited for producing high frequency electric and magnetic fields. Separate feeder means drives each of the element systems. Each of the element systems is positioned in adjacent interactive relationship to cross stress a common interaction zone of both fields to create a source from which electromagnetic waves radiate. The element system in which the electric field is originated establishes a radio frequency potential difference across an interaction zone between two conducting surfaces. The element system for establishing the magnetic field includes two other conducting surfaces for establishing an intense radio frequency displacement current. A radio frequency potential difference of the same frequency is applied between two of the conducting surfaces for establishing an intense circulating magnetic field to cross the interaction zone.
In a preferred embodiment a phasing unit splits an output of a radio transmitter into two parts having separate delay arrangements to produce synchronized electric and magnetic fields at the interaction zone. The phasing unit preferably includes fixed and variable phase delay circuits and at least one tapped transformer and a switch for adjusting each part of the output of the radio transmitter. The phasing unit also preferably has a wideband constant phase different circuit for low power operation for driving either of the separate units. Two separate power amplifiers develop sufficient power to provide separate feeds to the two separate element systems of the antenna so that within the interaction zone radio wave power is synthesized.
In another embodiment a single feeder is connected to one element system and a second feeder drives the other element system with a phase and magnitude t
REFERENCES:
patent: 3521284 (1970-07-01), Shelton, Jr.
patent: 4809009 (1989-02-01), Grimes et al.
Hately Maurice C.
Kabbary Fathi M.
Le Hoang-anh
Wimer Michael C.
LandOfFree
Radio antennas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radio antennas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio antennas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1304174