De@ 31, 1946- _ DE wlTT R. GODDARD SECTIONAL PARABOLIC ANTENNA SYSTEM Filed June 24, '1943 Mm /. ' 2 sheeisfsheet 1 @w wär* Dec.> 31, 1946. 2,413,558 DE WITT R. GoDDARD ' SECTIONAL PARABOLIC ANTENNA SYSTEM Filed June 24, 1945 2 Sheets-Sheet 2 'ßeW by '7 - ArroPA/EV 2,413,558 Patented Dec. 31, 1946 UNITED STATES ' PATENT OFFICE 2,413,558 sEcfrIoNAL PARABOLIC ANTENNA SYSTEM De Witt Rugg Goddard, Riverhead, N. Y., assignor to Radio Corporation of America, a corpora tion of Delaware Application June 24, 1943, Serial No. 492,032 9 Claims. (Cl. 250-11) > Z 1 Referring/now in detail to Figs. 1, 2 andïß of This invention relates to a new and useful split lParabolic antenna system for use with an ultra the drawings, .the center section l is shown mountedfupon a telescoping tripod 2. On each high frequency radio transceiver. side of the center section there are located side sections or wings 3 and 4 which are arranged to be detached from the center section I by means of a An object of this invention is to provide an efficient light weight compact portable parabolic antenna for use in ultra high frequency systems flat arcuate clamp strip 5. The end portions of for two-way voice communication. My invention the side sections are riveted to an angular mem is particularly useful for short waves of the order of ten centimeters in length. ber 6 which is arranged to slide under the arcuate ' Another object of this invention is to provide a 10 strip 5. The side sections 3 and 4 are attached and detached by .a thumb screw 1~ which engages portable waterproof three-piece parabolic an~ the slots 8 in the angular portion 6 and passes .tenna in which each separate portion is insulated through the arcuate strip 5. The angular mem from the other. ber 6 is provided with a plurality of slots 8 which My invention employs a novel construction wherein a parabolic reflector is split into three 15 are shown more in detail in Fig. 3 of the drawings. It will be seen that the thin parabolic reflecting pieces, namely, a center section and two side surface 3 has Ithe special aluminum angular por sections. Suitable means for removably fasten tion 6 riveted thereon by means of rivets 6A. ing the sides on the center section are provided. This angle material contains a circular perfora A feature of this invention resides in the fact that the center section of the parabolic reflector 20 tion 5A located »at the top and several half round notches 8 which are distributed along its edge. serves to form a portion of a control box which The main center section or box portion l con houses the radio frequency unit and is arranged tains an arcuate strip 5 which is held in position with another box or cover portion to house the by means of three loose fitting rivets SB and the side sections and other devices. Parabolic reflectors are old in the art, there 25 knurled thumb screw ’l clamps the side sections 3 and 4 together. At the upper left hand corner being many different arrangements. Generally, of the box portion a stud 5B protrudes about one they are large in size, and therefore cumbersome> quarter of an inch beyond the surface of the and heavy to carry. This invention overcomes ‘ strip '5. The threaded .brass plate 1A is arranged these objections since by splitting the reflector into three major component parts, capable of 30 to receive the .threaded thumb screw 1. The plate 1A is fastened to the sides of the wood box I by being -readily assembled, detached and stored lmeans of small screws 1B. The center section away in a suitable container, portability, without or box portion l is provided with a metallic con loss of electrical ei'liciency, as will be explained nection bushing 9 which is arranged to receive a later, is insured. ` The parabolic reflector of this invention is par `ticularly adapted for forming the antenna system of Aa portable two-way voice radio communication system operating at a wavelength of about ten centimeters, although, obviously, the invention is not limited to operation at this frequency. The 40 antenna system described herein is intended to be used with a transceiver similar to -theone de scribed in a copending application of K. MacLean and DeWitt R. Goddard, filed May 20, 1943, Se rial No. 487,722. A detachable antenna radiator member I0. Radia tor I0 is in the form of a simple dipole located' at the end of a coaxial transmission line (not shown) 'and isolated therefrom by two quarter wave sections. In front of the dipole 10A and insulated therefrom, is another dipole 10B which is used as .a reflector. The latter is insulated from IBA since it is molded in thermoplastic insulating material such as lucite or polystyrene. The ar rangement as a whole is such as to throw the ma 45 jority of the radiations against the parabolic re flecting surfaces I, 3 and 4 of the reflector. The lower portion of the center section has located therein a threaded ?ange member Il which is threaded at ,l2 to receive a clamping bolt i3 for reflector of this invention, , Fig. 2 is a cross-section taken on 2-2 of Fig. l, 50 securing the center section to the tripod 2. To the right of flange H there is located a connec-Fig. 3 is a perspective View partly in section tion socket I4 which is arranged to receive ya showing a portion of one of the side sections; plug and'cable i5 which connects thef radiator Fig'. 4' is a perspective 'view of the box portion l0 and transceiver to the battery and vibrator formed by the center section of the parabolic re 55 power supply box I6 located at the base of the flector, and tripod. Connection is made from radiator I0 and v Fig. 5 is an end view of Fig. 4. This invention will best lbe understood by re ferring to the accompanying drawings in which: Fig. 1 is a front elevation of the split parabolic 2,418,558 3 transceiver to the socket III by means of leads I'I which are housed in the rear portion within the box transceiver portion of the center section. As the parabolic antenna reflector unit of this invention is intended for outdoor use, I prefer to cover the entire surface of the antenna radiator IEI and the members I, 3 and il -with a low loss insulating material such as Amphenol to avoid arrangements may be made where necessary to provide electrical contact between sections. While I have indicated and described a pre ferred system for carrying my invention into effect, many modifications may be made without departing from the scope of my invention. What I claim is: l. A parabolic ultra high frequency antenna system comprising a rectilinear box portion hav detuning effects due to rain, snow or ice forming on the antenna itself. A coaxial line is preferred 10 ing one of its surfaces forming a center section, two side sections insulatingly secured to said to feed the antenna which is isolated by two quar ter wavelengths arranged in the usual fashion. box portion so as to be detached from each side Referring to Figs. 4 and 5 of the drawings, of said center section. . 2. A high frequency reñector comprising a cen there is shown how the cover and box portions of the center section are joined for carrying. 15 tral section, a pair of side sections removably The cover portion 2E! serves for enclosing the side secured thereto, the entire surface of said central section and said side sections being covered with sections and also other control devices such as a low loss insulating material to avoid detuning the radiator Iii, head-phones Iii, and plug and effects due to foreign material coming in contact cable I5, which devices are located within the connues of the box cover portion when the box 20 with said reflector. 3. An ultra high frequency antenna system is closed. The cover portion ZIB is provided with comprising a parabolic reflector including a recti a carrying handle 2l and is secured to the box linear box portion having one of its surfaces or transceiver portion of the center section by forming a center section and having two side means of suitcase clasp members 22 and The lower portion cf center section i contains sections insulatingly secured thereto so as to be a radio frequency device in the form of a trans detached from each side of said center section, said box portion being adapted for enclosing a ceiver which occupies approximately the lower radio frequency device, a removable cover portion third portion of the box. Its tuning and volume cooperating with said box portion for enclosing control knobs 2d are located on a panel at the rear of the box. Access to these controls is ac 30 said side sections. 4. An ultra high frequency antenna system complished by having an aluminum cover plate comprising a parabolic reflector including a pivotally secured to the box by means of a rectilinear box portion having one of its surfaces Fastened to this cover plate are two inwardly i'oi canvas shields 2i which are ar ranged so that in the operation of the transceiver the plate ‘i5 and canvas shields 2i in the open position constitute an effective rain shield. In Fig. 2 the cover plate and shield are shown in the closed position with the' open position shown by dash lines. In Fig. 4 the rain shield is indi cated in the open position with the control knobs îië exposed for» operation. To transport the re iiector the» canvas shields are folded inwardly, then pressed down and covered by the aluminum plate 25. At the lower portion of plate 25 there are two leather straps 28 which are snapped by means of glove fasteners 2i) to the bcttomof the box l, as shown in Fig. 5. In the operation and assembly of this system the perforation 5A of the wing or end sections is placed over the stud 5B and then the wing is swung into operating position so that, the angle portion of the wing slides beneath the arcuate strip il until the notches d coincide with the rivets EB and the thumb screw "1. The thumb screw ‘l is then tightened and the wing slid into the position shown inl Figs, 1 and 2 and the entire rel'iector is then complete. The antenna radiator iii is plugged in the metallic connection bushing , forming a center section and having two side sections secured thereto so as to be detached from each side of said center section, said center section being arranged with straight ends to form a portion of a lbox for enclosing a radio frequency device, the entire surface of said center section and said side sections being covered with a low loss insulating material to avoid detuning effects due toforeign material coming in Contact with said reñector, a cover portion cooperating with said center section for enclosing said side sec tions, and fastening means secured to the lower portion of an end of said center section for fasten ing the reñector to a tripod. 5. An ultra high frequency antenna system comprising a parabolic reflector including a rectilinear box portion having one of its surfaces forming a center section and having two side sections secured thereto so as to be detached from each side of said center section, the entire surface of said center section and said side- sec tions being ccvered with a low loss insulating material to avoid detuning effects due to foreign ' material coming in contact with said reñector, said center section being arranged with straight ends in the form of a box, a cover portion co The thumb screw I3 is tightened to secure 60 operating with said center section for enclosing the center section I to tripod 2. Electrical con said side sections, a radio frequency device lo, nection >from the transceiver- to the power supply IS is made by means of cable and plug being inserted in socket I4. Theparabolic'antenna system is then ready for use. 65 cated in said center section, fastening means secured to the lower portion of an end of said center section for fastening the reflector to a tripod~ which is arranged at one end of said cen ter section, and a socket portion located adja cent said fastening means for the tripod for elec» It will be noted that no electrical contactV is made between the side sections 3 and ¿l and the center section i. In fact I prefer to deliberately trically connecting said radio frequency device insulate the entire surface of the sideA sections to a source of power. with low loss4 insulating material for the reason 70 6. A parabolic, ultra high frequency antenna that I iînd that poor contact generally causes system comprising a rectilinear box portion hav,. noise in the receiver when electrical contact is ing one of its surfaces forming a center section, made. It is to be understood that the parabolic two side sections secured to said box portion so reflector surface may be cut into other shapes as to be detached from each side of said center than those shown in Figs. 1 and 2 and diñerent 75 section, the entire surface of said center' section 2,413,558 5 and said side sections being covered with a low loss insulatingmaterial to avoid detuning effects due to foreign material coming in contact with said reflector, an antenna radiator and a radio frequency device located in the central portion of said center section., 7. A parabolic ultra high frequency antenna system comprising a rectilinear box portion hav 6 cated within the box portion of said center sec tion, a cover portion cooperating with said center section for enclosing said side sections when it is desired to transport said antenna system, fas tening means secured to the lower portion of said center section for fastening the reflector to a l;ripod which is arranged at one end of said cen ter section and a socket portion located adjacent thereto for electrically connecting said trans ing one of its surfaces forming a center section, to a source of power. two side sections with angular slotted portions 10 ceiver 9. An ultra high frequency antenna system arranged to be detached from each side of said comprising a parabolic reflector including a cen box portion, the entire surface of said center sec« ter section having two side sections secured there tion and said side sections being covered with a to, said center section being arranged in the form low loss insulating material to avoid detuning of a rectilinear box, a radio frequency device effects due to foreign material coming in contact 15 located in the lower portion of said center vsec with said reflector, and mechanical engaging tion, an operating panel maintained at the rear means secured to said box portion of the center of said center section, a hinged waterproof section for the engaging angular slotted portions cover arranged to be folded over said panel, a located at the ends of said side sections for fasten cover portion cooperating with said center sec 20 ing them to the center section. tion for enclosing said side sections when it is 8. An ultra high~ frequency antenna system desired to transport said antenna system, fas comprising a parabolic reflector including a cen tening means secured to the lower por ter section having two side sections secured there tion of said center section for fastening the re to, the entire surface of said center section and flector to a tripod which is arranged at one end said side sections being covered with a low loss 25 of said center section and a socket portion located insulating material to avoid detuning effects due to foreign material coming in contact with said reflector, said center section being arranged in the form of a rectilinear box, a transceiver 1o adjacent thereto for electrically connecting said radio frequency device to a source of power. DE WITT RUGG GODDARD.