Bandwidth-tunable filtering balun based on compact 3D configuration

Bandwidth-tunable filtering balun based on compact 3D configuration

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
Electronics Letters — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

For the first time, a novel bandwidth-tunable filtering balun based on compact 3D configuration is presented. The overall design is basically composed of a two-layer horizontal feeding plane, a three-layer vertically mounted plane, and the transmission-line circuits disposed on both. Implementing the ring resonator in vertical double-sided parallel-strip line, the complete horizontal ground and frequency-independent phase difference are subtly combined. Connecting the shunt varactor diodes with the inserted vertical ground, the desirable filtering property and flexible bandwidth tunability are splendidly fulfilled. A prototype balun centred at 1.53 GHz is fabricated. The measured operating bandwidth is dynamically tuned from 0.87 to 1.23 GHz with a return loss <−10 dB, forcefully validating the design concept.


    1. 1)
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
      • 6. Skyworks SMV1265–011 data sheet Skyworks solutions’. Woburn, MA, USA.
    7. 7)

Related content

This is a required field
Please enter a valid email address