US2437496A - Phasing network - Google Patents

Description

March 9, 1948. N. w. ARAM PHASING NETWORK Filed July 2, 1942 2 Sheets-Sheet 1 March 9, 1948. N. w. ARAM 2,437,495

PHASING NETWORK Filed July 2, 1942 2 Sheets-Sheet 2 Patented Mar. 9, 1948 PHASING NETWORK Nathan W. Aram, Chicago, Ill., assignor to Zenith Radio Corporation, Chicago, 111., a corporation of Illinois Application July 2, 1942, Serial No. 449,438

21 Claims. 1

This invention relates to phasing networks and particularly to networks which are arranged to supply power in proper phase relationship to a plurality of feeder lines.

A further object of the invention is to provide such a phasing network of coaxial lines of correctly matched impedances whereby equal power distribution of desired phase relationship among all of said plurality of lines is obtained.

A further object of the invention is to provide such a network adapted for the correct distribution of power of varying frequency in which the networks inherently provide compensation for variation of impedances of radiating elements with variation of frequency.

A further object of the invention is to provide a coaxial line network for equally distributin power from two main feeder coaxial lines to eight feeder coaxial lines in desired relative phase relationship.

A further object of the invention is to provide a coaxial line network for equally distributing power in desired phase relation from two main feeder lines to four pairs of feeder coaxial lines, the four pairs being arranged in symmetrical relation, each pair being opposite another pair, each main feeder line being connected directly to one of opposite pairs and by other coaxial lines to the other of such pair and to the lines of another pair.

A further object of the invention is to provide a coaxial line network for equally distributing power in desired phase relation from one or two main feeder lines to four pairs of feeder coaxial lines, the four pairs being arranged in symmetrical relation, each pair being opposite another pair, the main feeder lines being connected to lines of adjacent pairs and each being connected by other coaxial lines to the other of such pair and to the lines of another pair.

Other objects, advantages and capabilities will appear fnom the following description of a preferred embodiment thereof taken in conjunction with the accompanying drawings, in which:

Figure 1 is a wiring diagram of one embodiment of my invention;

Fig, 2 is a wiring diagram of a further embodiment of my invention; and

Fig. 3 is a wiring diagram of a still further embodiment of my invention.

In my application Serial No. 449,437, filed July 2, 1942, now Patent 2,338,564, I have disclosed an improved turnstile antenna which employs eight vertical coaxial feeder lines for the supply of energy in proper phase to radiating elements.

These vertical feeder lines are arranged in pairs round a mast which carries the radiating elements. Two of these vertical coaxial lines supply the north, for example, radiating elements, two others the south radiating elements, two others the east radiating elements, and two others the west radiatin elements. It will, of course, be understood that the principal points of the compass have been selected merely for the purpose of ease of reference. While my improved phasing network is well adapted for employment with such a turnstile antenna, it will be. understood that the invention is not intended to be limited to that purpose since it may be used in connection with other apparatus in which it is desired to distribute energy in desired phase relationship.

Referring to Fig. 1, the reference numerals 10, II, l2, l3, I l, l5, l6 and 11 represent points on the vertical feeder lines of the applicationreferred to, which points, for convenience, are referred to by the same numbers, on a reference plane, which may be a suitable plane below the radiating elements.

- For the antenna disclosed in the application referred to, the points 16 and 12 are fed in opposite phase. The points I! and I3 must lag the phase of It and I2, respectively, by degrees. The phasing of the points 10, ll, l4 and [5 must be similar relatively to that of points I6, ll, l2 and I3, but between these two groups there must exist phase quadrature, In other words, one group must lead the other group by ninety degrees. In this embodiment, the former group I0, H, M and I5, is arranged to lag the latter group I6, ll, l2 and 43.

Two balanced coaxial main feeder lines l8 and i9 are connected through quarter wave length transformers 2B and 2! to the points [6 and I 2, respectively. The points It and I! and the points 12 and [3 are connected respectively by means of half wave loops 22 and 23, respectively, which loops are also coaxial lines. The points I6 and i2 are connected by quarter wave loops 24 and 25 to the two points it and I0, respectively. The two points [4 and I0, respectively, are connected by half wave loops 26 and 21 to the p ints l5 and II, respectively. The loops 24, 25, 26 and 21 are also preferably coaxial lines.

It will of course be understood that various changes may be made without deviating from the spirit of the invention. Thus, the loops 24 and 25 may be connected to the points 15 and II instead of the points l4 and I0. As fully explained in the application referred to, this change makes no difference in the essential operation of the antenna which that application discloses.

If the vertical coaxial lines Ill, II, I2, I3, I4, I5, I6 and I1 have individual surge impedances of '70 ohms, then the loops 22, 23, 26 and 21 should likewise have a surge impedance of '70 ohms. The loops 24 and 25 should have individual surge impedances of 35 ohms. The impedance of the quarter wave transformers 20 and 2I is arranged to match the impedances of the lines I8 and I9 to the parallel impedances across the ends of these transformers connected to the points I6 and I2. This can readily be done by varying the internal diameter of the inner conductor of the quarter wave coaxial lines which constitute the transformers 20 and 2|. The surge impedance of a coaxial line is given by the formula 138 log g:

where d1 is the inner diameter of the outer conductor and d2 the outer diameter of the inner conductor of the coaxial line.

It will thus be seen that by merely varying d2, the quarter wave transformers 20 and 2| may be made to have the proper surge impedance for matching the lines I8 and I9 to the points I5 and I2. As is well known, the surge impedance of the transformers 20 and 2|, respectively, should be the geometric mean between the surge impedance of the line I8 and the impedance at the point I6 on the one hand, and the surge impedance of the line I9 and the impedance at the point I2 on the other hand, for proper matching.

Since the lines I8 and I9 are balanced lines, it will be obvious that if the instantaneous phase angle at I6 is 0, the phase angle at I2 is 1r, these points being of opposite phase, and the phase angle at I1 is 1r and the phase angle at I 3 is 0, these being again of opposite phase. If desired, the loops 22 and 23 may be any other odd number of half wave lengths and the same result is obtained, Owing to the quarter wave lengths of the loops 24 and 25, the corresponding instantaneous phase angles at I4 and II] are 7r 2 Bindthe phase of these two points being again opposite. Owing to the half wave loops 26 and 21, the corresponding instantaneous phase angles at the points I5 and. I I are 5 and ---5 these points again being of opposite phase. Thus, the points I0, II, I4 and I5 have phases which lag the phases at I8, II, I2 and I3, respectively, by ninety degrees, and the requisite phase quadrature is obtained.

Ifthe vertical lines I5, I I, I2, etc., are standard IO-ohm coaxial lines, and the loops 22, 23, 26 and 21 are 70-ohm coaxial lines, they match the impedances of the vertical lines. The coaxial lines 24 and 25, each being a 35-ohm caxial line, match the impedances of the two coaxial lines which are connected in parallel across their ends. That is, one end of the line 24, for example, is connected at the point I4 to the parallel impedances of the two vertical lines I4 and I which have impedances of 70 ohms. The surge impedances of the main feeder lines I8 and I9 are correctly matched to the parallel impedances at the points I6 and I2 so that correct 4 implidance matching exists throughout the networ Since the impedance of the line 24 is equal to the parallel impedances of the lines I6 and I1, equal power distribution between the pair of vertical lines I5 and I1 and the pair of vertical lines I4 and I5 is established. Furthermore, since the surge impedance of the line 25 and the impedance of the vertical coaxial line I4 are equal, equal distribution of power between the vertical lines I4 and I5 is established. Thus, equal distribution of power is established between all the vertical lines II), II, I2, I3, I4, I5, I5

7 and I], and the desired phase relation is estabof the lines I6 and I1.

lished as has before been described.

In some cases it has been found impracticable to connect the main feeder lines I8 and I9 to opposite'vertical lines such as I6 and I2, but it has been found possible to connect the main feeder lines to vertical lines of two adjacent pairs such as l4 and I2. For this purpose, the modification shown in Fig. 2 is preferably followed. The main feeder line I9 is connected to the vertical feeder lines I 9, II, I2 and I3 with the aid of the loops 23, 25 and 21 in exactly the same manner as shown in Fig. 1. Consequently, similar reference numerals are employed in Fig. 2 and it is not necessary to discuss the connections between I5, II, I2 and I3 on Fig. 2.

In Fig, 2 the main feeder lines are I8 and I9. I provide an extra length or loop 28 in the line I8 of one quarter wave length so that the terminals of the lines I8 and I9 which are connected to the transformers 20' and 2| are not of opposite phase. Thus, if the instantaneous phase angle at the terminal of line I8 is 0, the phase angle at the terminal of the line I9 is The corresponding instantaneous phase angles at the points I4 and I2, respectively, are

respectively. It will be obvious that the corresponding instantaneous phases at the points I0, II, I2 and I3 are the same as that given in the description of the preceding embodiment.

In the embodiment of Fig. 2, points I4 and I5 are connected by a half wave loop 26' and the points I6 and I1 are connected by a half wave loop 22. Likewise, the points I4 and I6 are connected by a three quarter wave length line 24'. When the instantaneous phase angle of the point I4is the phase angle at the point I5 is Likewise, the corresponding instantaneous phase angle at the point I6 is 0 and the corresponding instantaneous phase angle at the point I! is IT. Thus, it is to be noted that I have established the same instantaneous phasing in the embodiments of both Fig. 1 and Fig, 2.

In the embodiment of Fig. 2, the impedance of the 70-ohm line I5 is properly matched by a IQ-ohm loop 26 and a similar 70-ohm loop 22' matches the 70-ohm vertical line I7. A 35-ohm line 24' matches the parallel impedances of the lines I4 and I5 to the similar parallel impedances As in the previously described embodiment, the quarter wave transformers 2i) and 2! properly match the surge impedances of the lines it and E9 to the parallel impedances at the points M and i2 to which they are connected. Consequently, equal distribution of power in proper phase relationship is supplied to all the vertical lines ill, ll, l2, l3, l4, l5, l6 and [1.

It will, of course, be understood that any of the lines 26, 22, El, 23, 2 2 and 25 may be increased in length by any whole number of wave lengths.

My improved networks are particularly suitable for wide band operation, as for television transmission. Such wide band operation presents a problem in the fact that the antenna impedance is not constant with frequency. This impedance variation consists largely of a reactance term which becomes the greater as the frequency varies farther oil resonance.

The folded dipoles described in my copending application above referred to, provide one degree of compensation for this reactance term due to the fact that the terminal impedance of each dipole is a combination of a series-resonant impedance of the dipole and a parallel-resonant impedance of the folded arms which form quarter-Wave short-circuited lines. Since series and parallel resonant circuits have oppositely sloped reactance-frequency curves, the resulting impedance varies less with frequency than the seriesresonant impedance or the parallel-resonant impedance alone. The off-resonant reactance of all the dipoles fed from points Hi, for example (Fig. 1), add to a value equal to that at the points I6. Since the point Hi is connected to the point it by the quarter wave length 24, the reactance at point 14 is inverted at the end of the line 2d connected to the point it, it is obvious that the variation of reactance at the point it is compensated by the variation of reactance at the point iii. A similar degree of compensation is also attained in the embodiment of Fig. 2 so that the main line transformer terminal impedance variation is the same as in the embodiment of Fig. 1.

In the embodiment of Fig. 2, a third degree of compensation is realized from the quarter wave length differential between the two lines I8 and 9 at their terminals, resulting from the quarter wave loop 28 in the line 83'. Whatever may be the value of the off-resonant reactance term at the terminals of the lines It and [9, this value, being equal for the two lines, appears at the transmitter end terminals with opposite signs for the two lines, because the quarter wave length loop 28 inverts the impedance of the-line 19 at the terminal of the line 8.

The two lines it and I9 are necessarily connected in series at the transmitter in order to obtain the necessary balance voltages at that point. The opposite reactance terms are compensating in the series connection and the line input impedance characteristic, as viewed from the transmitter, is thereby made more nearly constant with varying frequency.

The embodiment of Fig. 3 is similar to that of Fig. 2 with the exception that it is arranged for an unbalanced or single feed line so. The point I4 is connected through a quarter wave transformer 29 to the single unbalanced coaxial feeder line 36, the connecting point being designated 3|. The point 12 is connected to quarter wave coaxial line transformer 32 similar to the quarter wave transformer 29. The quarter wave transformer 32 is connected at point 34 to a quarter wave length coaxial line 33 which is connected to the point 3|.

If the instantaneous phase at the point 3| is 0 then the instantaneous phases at the points l4 and I2 are and Tr respectively, so that the same phasing is obtained as in the two previously described embodiments.

The two transformers 29 and 32 match the parallel impedances at the points l4 and [2, respectively, to double the impedance of the main feeder line 39. The line 33 has a surge impedance double that of the main feeder line 30.

The identical impedance against frequency characteristics measured at the points l4 and I2 appear at the point 3| with opposite phase angles and compensate in the parallel connection. The result is a more uniform impedance against frequency characteristic at the point 3| of the main feeder line 39, and thereforerefiections are reduced in the main feeder line over a wider frequency band so that an improved line termina tion is attained. Consequently, my improved phasing network is well adapted for distributing power with frequencies within a relatively wide band. I

Since the impedance of the line 30 is matched at the point 3| by two parallel impedances double the impedance of the line 30, it is obvious that equal distribution of power is attained at all the points [0, ll, 12, I3, l4, l5, l6 and H.

Although the invention has been described in connection with specific details of a preferred embodiment thereof, it must be understood that such details are not intended to be limitative of the invention except in so far as set forth in the accompanying claims.

I claim:

1. A phasing network for feeding a pair of lines in opposite phases and another pair of lines in opposite phases and in phase quadrature to the first said pair, comprising a main feeder line connected to one of a pair of lines at a point of connection, a line of an odd number of half wave lengths connecting said point of connection to the other of said pair, a line of an odd number of quarter wave lengths connecting said point of connection to one of the other pair of lines, and a line of an odd number of half wave lengths connecting last said line to the other line of last said pair.

2. A phasing network for feeding a pair of lines in opposite phases and another pair of lines in opposite phases and in phase quadrature to the first said pair, comprising a main feeder coaxial line connected to one of a pair of lines, to a quarter wave coaxial line and to a half wave coaxial line, said half wave coaxial line being connected to the other line of said pair, the quarter wave coaxial line being connected to one of the other pair of lines and to a half wave coaxial line, last said half wave coaxial line being connected to the other of last said pair of lines.

3. A phasing network comprising four coaxial lines, a main coaxial feeder line connected to one of first said coaxial lines, a coaxial line of an odd number of quarter wave lengths connecting said main feeder line to a second of said coaxial lines, and coaxial lines of an odd number of half wave lengths connecting the first of said coaxial lines to a third of said coaxial lines and the second of said coaxial lines to a fourth of said coaxial lines.

4. A phasing network comprising four coaxial lines,. a main coaxial feeder. line, connectedlto. one of first said coaxial lines, a 'c'oaxialline of an odd number 'of quarter .wave lengths connecting said main feeder line .to a second of saidlcoaxiallines, and coaxial lines of an odd number of half wave lengths connecting the first of said coaxial lines to a third of said coaxial lines and the second of said coaxial lines to a fourth of said coaxial lines, the surge impedances'of the coaxial lines of an odd number of half wave lengthsbeing equal to the surge impedances of each of the four coaxial lines and the surge impedance of the coaxial line of an odd number of quarter wave lengths being half the surge impedance of one of each of said four coaxial lines. 5. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pair's'of'lines, two main feeder coaxial lines of opposite phase connected to two opposite lines, four coaxial lines of an odd number of half wave lengths connecting the lines of each pair together, a'nda coaxial line of an odd number-of quarter wave lengths connecting one-'n'ia-in feeder line to one of an adjacent pair of' first saidcoaxiallines, and another coaxial line of an odd number ofquarter Wave lengths connectingthe other main feeder line to the coaxial line of first said coaxial lines opposite last said one of an adjacent pair of first said coaxial lines. o

6. A phasing network comprising eight coaxial lines arranged in pairs in generally squarepattern to constitute two pairs of opposite pairs of lines, two main feeder coaxial lines of opposite phase connected to two opposite linesf fourfcoaxial lines of an odd number of half wave lengths connecting the lines of each pair together, and a coaxial line of an odd number of quarter wave lengths connecting one' 'rn'ain feeder lirie to one of an adjacent pair of first said coaxial lines, and another coaxial line of an odd number of quarter wave lengths connecting the other main feeder line to the coaxial line of first 'said'coaxial lines opposite last said one of an adjacent pair of first said coaxial'lines, the surge 'impedances' of first said coaxial lines and said coaxial lines of an' odd number of half wavelengths being equal and being double the surge impedance ofeach of the lines of an odd number of quarter wave lengths.

7. A phasing network comprising ei'ght coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, two main feeder coaxial lines in: phase quadrature, one of said main feederlines-being connected to one of a pair of 'feederlines', the other main feeder line being connected-tonne of an adjacent pair of feeder lines,'two coaxial lines connecting said main feeder lines to ones of the other adjacent pairs, last said coaxial lines being of an odd number of quarter wave lengths and differing by an even number of quarter wave lengths, and four coaxial lines ofian odd number of half wave lengths connecting each pair of lines together. 7 h i 8. A phasing network.comprisingceight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, a main feeder coaxial line, connected topne of a first pair of feeder lines, a quarter wave coaxial line connecting said feeder line to one of a second adjacentpair of feederllines, a second main feeder coaxial line connected to one pf a third pair of feeder lines adjacent the first pair and opp t t s c ndpein,sei secendmein feeder line. b ingnadap dtto l adi i hes tt first main feederline by ninety degrees, and a three-quarter wave coaxial line connecting second said main feeder line to one of the fourth pair of coaxial lines and four half wave coaxial lines connecting the feeder lines of each pair.

9. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines; akpair of unbalanced main feeder coaxial lines, a quarter wave loop in one line whereby said line is adapted to lead the other line in phase by ninety degrees, last said feeder line being connected to one of said pairs of coaxial lines, a three-quarter wave coaxial line connecting said feeder line to one of an adjacent pair of coaxial lines, the other main feeder coaxial line being connected to cheat a pair of coaxial lines opposite last said pair, a quarter wave length coaxial line connecting last said feeder line to one of the other pair of coaxial lines, and four half wave coaxial'lines connecting each pair of coaxial lines together,

10. In a phasing network having four feed points, incombination, a main feeder coaxial line connected to a first of said feed points, a coaxial line of an'odd number of quarter wave lengths connecting last said feed point to a second of said feed points, and a coaxial line of an'odd number of halfywave lengths connecting first said feed point to a third of said feed pointsQand a coaxial line of an odd number of half waveilengths' connectingthe second of said feed points to the fourth of said feed points.

l1.'Ina phasing network comprising eight coaxial lines arranged in'pairs in generally square pattern to. constitute two pairs of opposite pairs of lines, in combination; a main feeder line connected tonne of a' pair of said coaxiallin'es, a coaxial lineof one quarter wave lengthtconnecting said main feeder line to a coaxial line of an adjacent pair, and a pair of half wave coaxial lines connecting the lines of each of two last said pairs together. a 1 i 12.In a phasing network comprising coaxial lines arranged in pairs to constitute two pairs of Opposite pairs of lines, in combination, a main feeder line comprising two conductors one of which is connected to one of a first'pair of said coaxial lines, a quarter wave loop in said feeder line, the other one of said feeder line conductors being connectedto one of a'second pair ofcoaxial lines; a coaxial lineof three quarter wave lengths connecting said one conductor' ofbsaid m'ain feeder line toa coaxial'line of a third pair, three half 'wave: coaxial lines eachconnecting individually' the lines of each oi 'saidtfirst; second and third pairs together, the-lines constituting the fourth pair of said two pairs of opposite pairs of lines being connected together through. a'fourth half wave line, and a quarter wave line connecting said fourth pair to said secondpair;

13. A phasingnetwork comprising fourlcoaxial lines of equal surge impedance, amain coaxial feeder line, a quarter ,wave length coaxial line transformer connectingflsaid mainfeederline to one of said four; coaxial lines at a pointof connection, a coaxial line of an odd number of quarter wave lengths connecting said point of connection to a second of said coaxial lines, and coaxial lines of an odd number of half wave lengths connecting the first of saidcoaxial lines to a third of said coaxial lines and thesecond of s i cee a es to e u thof said. oa al lines. a d ne tp an o n berte half w ve-le th havi a surge impe ance e ual to that-o1. irst said coaxial lines, said coaxial line of an odd number of quarter wave-lengths having a surge impedance of half that of said coaxial lines, said transformer having a surge impedance to match the surge impedance of the main feeder line to the parallel impedances of the four coaxial lines.

14. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, two main feeder coaxial lines of opposite phase, two quarter wave coaxial line transformers connecting said main feeder lines to two opposite lines of said eight coaxial lines at points of connection, four coaxial lines of an odd number of half wave lengths corinecting the lines of each pair together, a coaxial line of an odd number of quarter wave lengths connecting one of said points of connection to one of an adjacent pair of first said coaxial lines, and another coaxial line of an odd number of quarter wave lengths connecting the other point of connection to the coaxial line of first said coaxial lines opposite last said one of an adjacent pair of first said coaxial lines, the surge impedances of first said coaxial lines and said coaxial lines of an odd number of half wave lengths being equal and being double the surge impedance of each of the lines of an odd number of quarter wave lengths, said coaxial line transformers having a surge impedance which matches the surge impedances of the main feeder lines to the parallel impedances of the two pairs of four coaxial lines.

15. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, two main feeder coaxial lines in phase quadrature, quarter wave coaxial line transformers connecting said feeder lines each to one of adjacent pairs of first said coaxial lines, two coaxial lines connecting said main feeder lines to ones of the other adjacent pairs, last said coaxial lines being of an odd number of quarter wave lengths and differing by an even number of quarter wave lengths, and four coaxial lines of an odd number of half wave lengths connecting each pair of lines together, said eight coaxial lines and said four coaxial lines of an odd number of half wave lengths having the same surge impedance and said lines of an odd number of quarter wave lengths having half last said impedance, each of said transformers having a surge impedance which matches the surge impedance of the line to the parallel impedances of four of first said coaxial lines.

16. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, a main feeder coaxial line, a quarter wave transformer connecting said line to one of said pairs of lines, a quarter Wave coaxial line transformer and a quarter wave coaxial line loop connecting said main feeder line to one of an adjacent pair of first s'aid coaxial lines, two coaxial lines connecting said transformers to ones of the other adjacent pairs, last said coaxial lines being of an odd number of quarter wave lengths and differing by an even number of quarter wave lengths, and four coaxial lines of an odd number of half wave lengths connecting each pair of lines together, said eight coaxial lines and the four coaxial lines of an odd number of half wave lengths having the same surge impedance, said two coaxial lines of an odd number of quarter wave lengths having half last said impedance, said quarter wave loop having double the impedance of the main feeder coaxial "line and each of said transformers having an impedance which matches the parallel impedance of four of first said coaxial lines to double the impedance of the main feeder line.

1'7. A phasing network comprising four coaxial lines of equal surge impedance, a main coaxial feeder line, a quarter wave length transformer connecting the termination of the main coaxial feeder line to one of first said lines, a similar transformer and a quarter wave coaxial line loop in series connecting said termination to another of first said coaxial lines, and a pair of coaxial lines of an oddmember of quarter wave lengths connecting said transformers to the other two of said four coaxial lines.

18. A phasing network comprising four coaxial lines of equal surge impedance, a main coaxial feeder line, a quarter wave length transformer connecting the termination of the main coaxial feeder line to one of first said lines, a similar transformer and a quarter wave coaxial line loop in series connecting said termination to another of first said coaxial lines, and a pair of coaxial lines of an odd number of quarter wave lengths connecting said transformers to the other two of said four coaxial lines, last said pair of lines of an odd number of quarter wave lengths and first said four coaxial lines having equal surge impedances, said coaxial line loop having a surge impedance of double the surge impedance of the main coaxial feeder line, said transformers having an impedance which matches the parallel impedances at their point of connection to lines of the first said four coaxial lines to double the impedance of the main coaxial feeder line.

19. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, a main feeder coaxial line, a coaxial line connecting the termination of said main feeder coaxial line to a first line of one pair of coaxial lines, a coaxial line longer than last said coaxial line by an odd number of quarter wave lengths connecting said termination to a second line of an adjacent pair of lines, a pair of coaxial lines of an odd number of quarter wave lengths and differing in length by an even number of quarter wave lengths connecting said first and second lines respectively to a third and fourth line of the other two pairs of coaxial lines, and four coaxial lines of an odd number of half wave lengths connecting the two lines of each pair of lines together.

20. A phasing network comprising eight coaxial lines arranged in pairs in generally square pattern to constitute two pairs of opposite pairs of lines, a main feeder coaxial line, a coaxial line connecting the termination of said main feeder coaxial line to a first line of one pair of coaxial lines, a coaxial line longer than last said coaxial line by an odd number of quarter wave lengths connecting said termination to a second line of an adjacent pair of lines, a pair of coaxial lines of an odd number of quarter wave lengths and difthe surge impedance of said pair of lines of an oddnumber oi. quarter wave lengths differing by an even 'number of quarterwave lengths bein half that impedance, the coaxial lines connected to the termination of the main feeder coaxial line being'arranged to match double the impedance of the main feeder coaxial line-to'the parallel im-' pedances of four'of first-said coaxiallines;

-'21. A phasing network comprising four termina1s;-a main feeder connected to a first of said terminals, a line of an odds-number of quarter Waves connecting said first terminal to a second of said termina1s, a lineof-an=odd number ,of quarter wave lengths connecting said second of said terminalsto a third of said terminals, and a line of an-odd'number ofquarter wave lengths connecting said first terminal to a fourth of said terminals. 7 I

-- -NATHAN W. ARAM.

- REFERENCES CITED The following references are of record in the 5 file of this patent;

UNITED STATES PATENTS

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