Fully Packaged 4-bit 100 ps RFMEMS Time Delay

Abstract

This paper presents results of a fully packaged RFMEMS 4-bit, 100-ps capacitive time delay. The time delays are packaged using wafer scale low-loss and broad-band packaging technology developed at MIT Lincoln Laboratory (MIT-LL). The 4-bit 100 ps time delay has 1.8 dB±1 dB insertion loss from 5-20 GHz.

Design and development of a broadband amplitude compensated long time delay circuit on thin‐film liquid crystal polymer

“…These circuits may exhibit insertion losses as high as 20 dB and amplitude imbalances of Ϯ2 dB [1][2][3][4]. Amplitude compensation may be achieved by methods of (1) providing additional attenuation and/or gain elements, (2) dielectric tuning, or (3) use of negative dielectric circuits to obtain negative group delays. However, drawbacks for each method include poor broadband matching in methods 1 and 3, and complicated build through the use of multiple material sets in method 2.…”

“…Planar inverted F-type antenna (PIFA) evolves from inverted F antenna (IFA), which is well known as a "shunt-driven inverted-L antenna transmission line with an open end," by King et al [1]. IFA has a convenient advantage to match impedance by the length between the feed-point and short circuit (SC) [2]. However, IFA, in general, is low gain and narrow bandwidth [3].…”

Thin-film LCP amplitude compensated long time delay circuit

“…Phased array antennas require equal amplitude to provide controlled beam steering. Typical comparable circuits show up to 40 dB insertion loss, ±0.5 dB to ±2 dB amplitude imbalance, and 3 dB to 20 dB return loss [1][2][3][4]. LTDs generally suffer from 1) high insertion losses and 2) amplitude imbalance across different states.…”