Table 2.3-2. Theoretical Power Saving of RCR Over Conventional Standing Wave TEjq Slotted Arrays and (2) it can be designed to be structurally integrated with the amplitron or klystron heat dissipators because of the simplicity of the structure. Figure 2.3-8 shows a typical amplitron anode heat radiator integrated with the RCR bottom. The area required for heat dissipation computed by Rockwell indicates that the RCR has more than sufficient area to dissipate the excess heat. In the aperture high-density area, only 0.76 percent of the total RCR area is required to replace the 48-cm amplitron anode. The RCR bottom wall will be constructed of pyrolytic graphic composite, or equivalent, and plated for high RF conduction. The plating technique of pyrolytic graphite to operate at extremely high temperatures should be investigated in future studies. The potential weight savings of the RCR is then the removal of the side walls and the weight reduction achieved by incorporating heat dissipation in the waveguide bottom wall. The integrated assembly also provides techniques for solving the high-temperature interface problem. It should be noted that the RCR may offer other advantages for ease of maintenance and assembly. One of the primary uncertainties with the RCR is the suppression of higher order modes. One of the easiest ways of detecting higher order mode existence is by observing radiation patterns. Higher order modes will collimate in off-boresight locations, causing null filling and higher sidelobes. Rockwell developed special feed techniques which led to the reduction of higher order modes. To prove the technique does suppress higher order modes, scaled tests were conducted. A TE70 RCR shown in Figure 2.3-9 was fabricated and tests
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