Analytical derivation of a conformal perfectly matched absorber for electromagnetic waves

✍ Scribed by F. L. Teixeira; W. C. Chew

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 129 KB
• Volume: 17
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(199803)17:4<231::aid-mop3>3.0.co;2-j

✦ Synopsis

From the curves in Figure 2, we can see that a cubic cavity of 40 mm side length is the most efficient in reducing the oscillator noise of an active patch antenna with intrinsically poor noise performance. However, this would increase the volume and cost of a compact active antenna. Other easy and simple approaches including using a higher substrate or r using a low-noise device; even the use of a low-profile shallow cavity can also reduce the phase noise level up to 27 dB.

It was found in our experiments that, although the above noise reduction techniques can be combined together, i.e., using a low-noise device, a high substrate, and a deep r cavity simultaneously, the phase noise level of the whole circuit could not be further reduced from curve 3 in Figure 2. The maximum achievable performance is ultimately decided by the device, the combined antenna Q-value, and their interaction.