[Article] The Politics of Friendship by Jacques Derrida

By Jacques Derrida

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Z \Ae n d sin e e 2 3 n ...... 1---_• N-2 N-1 d 29 Microwave Know How each element of the array have same amplitude and phase, so the z is evidently the direction of maximu m radiation. A point P, very far from the array, will receive in the general case a sum of waves with differe nt phases (but practica lly equal amplitudes) since the distance between P and each element of the array will vary. If r is the distance fro m P to the element 0, the distance from P to the elemen t 1 is (r + dsinu), the distance from P to the element 2 is (r + Zdsinu), and so on.

10 . SKO HEAI LQ: l. OGARl-TEHS KO RAZPON: 40 ee RAZ PON: 24 avgus ta 200 1 . :: TAACAS 40 t1B Fig 39: E plane and H plane radiation patterns of the archery target antenna. Chapter 1: Antennas Fig 40: Directiv ity of the archery target antenna . ANTENA: TARCAG MERIL: S. GAJSEK DNE 1. avgusta 2001. ~ Iii 22 21 20 19 ~ 18 ~ 17 (f) f- 16 0 Z 15 >: 14 0:: W ,I (f) 13 12 II 10 2411II 2450 2500 255 0 2811II FREKVENCA f [MHz] 2650 2711II 2750 2800 ~ Probably the "archery target" antenna could be further optimised.

The reflector The flat reflector placed behind the dipoles has two main effec ts. One is suppressing the backward radiation; the other is increasi ng the gain of the array. The qainjncreases because the energy that is radiated backward is reflected back by the reflector and soit adds to the dire ct radiation and finally goes to the "right" hemisphere. It is known that an electromagnetic wave suffe rs a phase reversion after a reflectio n on a cond uctor, so it is intuitive that a good position to the reflector is when its distance to the dipo les is equal to 'A/4.

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