A Compact Quadrature Hybrid Based on High-Pass and Low-Pass Lumped Elements

In this letter, a novel compact quadrature hybrid using low-pass and high-pass lumped elements is proposed. This proposed topology enables significant circuit size reduction in comparison with former approaches applying microstrip branch line or Lange couplers. In addition, it provides wider bandwid...

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Bibliographic Details
Published in:IEEE microwave and wireless components letters 2007-08, Vol.17 (8), p.595-597
Main Authors: HOU, Jian-An, WANG, Yeong-Her
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Circuit properties
Circuit simulation
Circuit topology
Circuits
Couplers
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Frequency
Integrated circuit layout
Integrated circuit measurements
Integrated circuits
Loss measurement
Lumped element
Microstrip
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
monolithic microwave integrated circuit (MMIC)
Noise levels
PHEMTs
Ports
quadrature hybrid
Quadratures
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
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Summary:In this letter, a novel compact quadrature hybrid using low-pass and high-pass lumped elements is proposed. This proposed topology enables significant circuit size reduction in comparison with former approaches applying microstrip branch line or Lange couplers. In addition, it provides wider bandwidth in terms of operational frequency, and provides more convenience to the monolithic microwave integrated circuit layout since it does not have any bulky via holes as compared to those with lumped elements that have been published. In addition, the simulation and measurement of the fabricated hybrid implemented using PHEMT processes are evidently good. With the operational bandwidth ranging from 25 to 30 GHz, the measured results of the return loss are better than 17.6 dB, and the insertion losses of coupled and direct ports are approximately 3.4plusmn0.7 dB, while the relative phase difference is approximately 92.3plusmn1.4 deg . The core dimension of the circuit is 0.4 mm times 0.15 mm.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2007.901775