K-band reflection-type phase shifter using phase-shift range enhancement technique

This paper presents four continuously variable W-band phase shifters in terms of design, fabrication, and radiofrequency (RF) characterization. They are based on low-loss ridge waveguide resonators tuned by electrostatically actuated highly conductive rigid fingers with measured variable deflection between 0.3° and 8.25° (at a control voltage of 0–27.5 V). A transmission-type phase shifter based on a tunable highly coupled resonator has been manufactured and measured. It shows a maximum figure of merit (FOM) of 19.5°/dB and a transmission phase variation of 70° at 98.4 GHz. The FOM and the transmission phase shift are increased to 55°/dB and 134°, respectively, by the effective coupling of two tunable resonances at the same device with a single tuning element. The FOM can be further improved for a tunable reflective-type phase shifter, consisting of a transmission-type phase shifter in series with a passive resonator and a waveguide short. Such a reflective-type phase shifter has been built and tested. It shows a maximum FOM of 101°/dB at 107.4 GHz. Here, the maximum phase shift varied between 0° and 377° for fingers deflections between 0.3° and 8.25°.

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An S-Band Reflection-Type Phase Shifter - A Design Example Using Ferroelectrics

MRS Proceedings ◽

10.1557/proc-720-h5.3 ◽

2002 ◽

Vol 720 ◽

Author(s):

Dongsu Kim ◽

Yoonsu Choi ◽

Mark G. Allen ◽

J. Stevenson Kenney ◽

David W. Stollberg ◽

...

Keyword(s):

Thin Films ◽

Phase Shift ◽

Bias Voltage ◽

Wireless Lan ◽

Phase Shifter ◽

Smart Antenna ◽

Center Frequency ◽

Voltage Range ◽

Bst Thin Films ◽

Type Phase

AbstractOne of the challenges faced in using ferroelectrics in high frequency devices is how to effectively use the material in a circuit design. A compact reflection-type phase shifter fabricated on sapphire substrates coated with ferroelectric barium strontium titanate (BST) thin-films has been built which shows the promise of using BST thin films in the design of tunable microwave devices. The phase shifter, fabricated as one monolithic assembly, consists of a 3dB coupler, meandered line inductors and tunable interdigital capacitors. A continuously variable phase shift range of more than 100° using the branch-line coupler was obtained at a center frequency of 2.95 GHz, and more than 90° phase shift over 200 MHz bandwidth with a bias voltage range from 0 V to 175 V. The phase shifter using the Lange coupler has over 700 MHz bandwidth centered at 2.2 GHz with a phase shift of more than 90° and an insertion loss less than 2 dB and return loss of greater than 14 dB, over a bias voltage range from 0 V to 160 V. The loss of the BST phase shifter presented in this work is on the order of other commercially available RF front-end components, such as bandpass filters and RF switches. This holds promise for the practical realization of smart antenna systems in cellular handsets and wireless LAN cards.

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Electronically Controllable Phase Shifter with Progressive Impedance Transformation at K Band

Applied Sciences ◽

10.3390/app9235229 ◽

2019 ◽

Vol 9 (23) ◽

pp. 5229

Author(s):

Mohamed T. ElKhorassani ◽

Angel Palomares-Caballero ◽

Antonio Alex-Amor ◽

Cleofás Segura-Gómez ◽

Pablo Escobedo ◽

...

Keyword(s):

Phase Shift ◽

Phase Shifter ◽

Dynamic Range ◽

Phase Shifting ◽

Final Phase ◽

Hybrid Coupler ◽

Electronically Tunable ◽

Electronically Controllable ◽

Good Agreement ◽

K Band

This communication presents the design of a two-port electronically tunable phase shifter at K band. The phase shifter consists of a 3 dB hybrid coupler loaded with reflective phase-controllable circuits. The reflective circuits are formed by varactors and non-sequential impedance transformers which increase the operational bandwidth and the provided phase shift. The final phase shifter design is formed by two loaded-coupler stages of phase shifting to guarantee a complete phase turn. An 18 GHz phase shifter design with dynamic range of 600 degrees of phase shift is depicted in this document. The prototype is manufactured and validated through measurements showing good agreement with the simulation results.

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