Compact, tunable Wilkinson power divider using tunable synthetic transmission line

Abstract

A very compact and frequency tunable Wilkinson power divider is suggested and demonstrated for the first time. By replacing k/ 4 section lines in a conventional Wilkinson power divider with varactor tunable, lumped-element synthetic transmission lines, dramatical size reduction and frequency tunability has been achieved. The prototype circuit fabricated shows excellent performance. For tunable frequencies from 0.71 to 0.99 GHz, the insertion loss is less than 3.52 dB, whereas the return loss and isolation are greater than 20 dB. Yet, the size of this voltage controllable Wilkinson power divider is only 4 mm by 8 mm, which occupies less than 3% area of original Wilkinson power divider structure.

A Tunable Planar Balun with an Isolation Circuit Using Varactors Loaded Coupled Lines

“…With the development of wireless communication technology, the demands for reconfigurable components which could cover multiple bands are increasing. Thus, various frequency tunable front-end circuits have been developed, such as power dividers [17,18], couplers [19,20], and baluns [21][22][23][24]. In Reference [21], a compact frequency tunable microstrip balun with a ring structure is proposed.…”

Compact Band-Selective Power Divider Using One-Dimensional Metamaterial Structure

“…Moreover, it is difficult to select the desired band in such structures. To overcome such limitations, a compact and broadband tunable Wilkinson power divider has been introduced in [9].…”