Frequency reconfigurable RF circuits using photoconducting switches

Abstract

Designs for a frequency switchable dual-band branch-line coupler and a reconfigurable S-band

Characterising the linearity of an optically controlled photoconductive microwave switch

“…Microwave switches consisting of PIN and varactor diodes, MEMS switches and photoconductive switches are widely being researched to reconfigure wireless communications systems such as antennas [2] and circuitry including filters, amplifier matching circuits and couplers [3]. Since linearity of such systems is often limited by the switching device, there is continuous research into improving microwave switch linearity in reconfigurable circuits; a summary of a selection is presented in Table 1 in terms of Third Order Intercept (TOI), 3rd Order Input Intermodulation Product (IIP3) and Output IP3 (OIP3).…”

Low‐power photonic control of a microwave ring resonator using bulk illumination

“…Photonic control of RF signal propagation is an important topic that continues to be an active area of research and development in microwave photonics [1–14]. Photonic control has many advantages over conventional electrical control.…”

A planar ultrawideband antenna with photonically controlled notched bands

“…References have reported devices fabricated from coplanar waveguides and microstrip transmission lines printed on silicon substrate [3], [4]. The simple microwave switch [5] was applied in designs of antennas, filters, phase-shifters and couplers [6]. The main advantage of optically controlled microwave circuits is high level of isolation between the controlling electronic circuit and the microwave circuit.…”