**Author details**

**5. Conclusions**

*S11 of the wideband coupler.*

**Figure 35.**

**46**

**Figure 34.**

*The wideband coupler insertion loss.*

*Innovations in Ultra-WideBand Technologies*

This chapter presented a low-cost, integrated 18–40 GHz wideband compact frontend with a 47 dBm high power limiter. The frontend consists of two channels: a high gain and low gain channel. Wideband MMIC switches are employed to select the required channel. The gain of the high gain channel is around 27 dB with 1 dB

This chapter also discussed the design and performance of a compact, low-cost, integrated SFB. The integrated SFB has several advantages over the discrete SFB. For example, the weight of a discrete SFB is 1 kg and the weight of an integrated SFB is 50 g. The volume of the discrete SFB is twice the volume of the integrated SFB. The filter contains nine side-coupled microstrip lines printed on a 5-mil alumina substrate. ADS and AWR software were applied to optimize the filter dimensions and structure to meet the system requirements. The filter's passband bandwidth is around 8 GHz. The SFB insertion loss is around 12 dB in the low frequency range and 9.5 dB in the high frequency range. The filter flatness in the passband frequencies is better than 1 dB. The received signal is rejected by 40 dB at 7 GHz from the center frequency. The received signal is rejected by 60 dB at

flatness. The noise figure of the module is around 9 dB.

11GHz from the center frequency. The SFB volume is 2 x 5 x 1 cm.

Albert Sabban Kinneret College, Kinneret Israel and Ort Braude College, Karmiel, Israel

\*Address all correspondence to: sabban@netvision.net.il

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
