Electronically tunable lumped element 90° hybrid coupler

Fardin, E.A.; Holland, Anthony S.; Ghorbani, Kamran

doi:10.1049/el:20060129

Cited by 42 publications

(14 citation statements)

References 6 publications

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“…• High losses in the hybrids due to mismatched signals. • Complexity of designing tunable hybrid [7] having a bandwidth large enough capable of covering both Uplink (UL) and Downlink (DL) bands simultaneously. Even though, we cannot deny that broadband hybrids can be built, but they require the use of micro-strip lines whose dimensions are comparable to the wavelength.…”

Section: Limitations Of Classical Mdn Design a Hybrids Limitationsmentioning

confidence: 99%

On the design of wideband and tunable matching and decoupling networks for N-port antennas

Bouezzeddine

Schroeder

2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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This paper deals with the design of matching and decoupling network for a 4-port MIMO antenna system operating in the TV white spaces from 470 MHz to 790 MHz. After stating the limitations on the classical design based on hybrids, we consider a new approach in order to optimize the MIMO antenna performance, in terms of bandwidth, by taking advantage of some degrees of freedom in the matching and decoupling network. The maximum attainable bandwidth will be reported as a function of the network elements.

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Section: Limitations Of Classical Mdn Design a Hybrids Limitationsmentioning

confidence: 99%

On the design of wideband and tunable matching and decoupling networks for N-port antennas

Bouezzeddine

Schroeder

2014

The 8th European Conference on Antennas and Propagation (EuCAP 2014)

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“…Most recent advances are presented in [7], where the center frequency of a coupler is adjusted to allow switching between several narrow frequency bands. Varactor diodes were also used in a hybrid circuit by Ferrero [8] to reconfigure an antenna to allow different polarization modes.…”

Section: Tunable Hybridmentioning

confidence: 99%

Circularly polarized patch antenna with high Tx / Rx-separation

Mayer

Scholtz

2009

2009 IEEE International Conference on RFID

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In this contribution an antenna is described that allows simultaneous transmission and reception in the same frequency band. Circular polarization is employed for a most reliable communication with radio frequency identification (RFID) transponders that typically have linearly polarized antennas. To achieve high separation between transmitted and received signals, a square patch antenna originally transmitting horizontally and vertically polarized radiation is combined with a 3 dB-hybrid circuit. With this hybrid circuit the antenna can simultaneously radiate a right-hand circularly polarized wave and receive a left-hand circularly polarized wave. Furthermore, the transmit signal that is unintentionally leaking into the receive path can be compensated by tuning the hybrid circuit with two variable capacitance diodes. At 866 MHz a maximum Tx / Rx-separation of 65 dB was achieved in a static scenario. In a time variant indoor scenario with a metal object moving on a conveyor belt a Tx / Rxseparation of more than 52 dB was achieved by continuously tuning the hybrid circuit with a minimum-search algorithm.

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“…With the advent of multi-standard frontends in modern communication systems, directional couplers are required to be frequency reconfigurable [4][5][6][7], coupling reconfigurable [8][9][10][11][12], and phase reconfigurable for smart antenna and software defined radio applications. In [13], a rat-race coupler with −9 ∼ 6 dB power dividing ratio is proposed.…”

Section: Introductionmentioning

confidence: 99%

Coupled Line Rat-Race Coupler With Wide Adjustable Power Dividing Ratio and Uncrossed Input/Output Ports

Li¹,

Fang²,

Wang³

2017

PIER C

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Abstract-A novel rat-race coupler with wide adjustable range of power-dividing ratio and uncrossed input/output ports is presented by using coupling adjustable trans-directional (TRD) coupled lines, parallel coupled lines and a 180 • phase shifting line. Wide adjustable range of power-dividing ratios is accomplished by varying the coupling of the TRD coupled lines. Moreover, with the combination of the TRD coupled lines and parallel coupled lines, the input and output ports of the rat-race coupler are uncrossed. The structure of the proposed rat-race coupler is analyzed, and the design equations are derived. As an example to validate the feature of the proposed rat-race coupler, a prototype operating at 1.6 GHz is devised, fabricated and measured. The measured results show that the designed coupler has a wide adjustable range (−7 ∼ 15 dB) of power dividing ratio with a controlled voltage range of 3.3 to 13.5 V.

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Electronically tunable lumped element 90° hybrid coupler

Cited by 42 publications

References 6 publications

On the design of wideband and tunable matching and decoupling networks for N-port antennas

On the design of wideband and tunable matching and decoupling networks for N-port antennas

Circularly polarized patch antenna with high Tx / Rx-separation

Coupled Line Rat-Race Coupler With Wide Adjustable Power Dividing Ratio and Uncrossed Input/Output Ports

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