A Low Voltage Tunable Analog Phase Shifter Utilizing Ferroelectric Varactors

2011 IEEE MTT-S International Microwave Symposium

Brown

et al. 2011

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Ferroelectric (FE) Barium Strontium Titanate (Ba (1-x) Sr x TiO 3 , BST) thin film varactor technology is applied to the antenna miniaturization and reconfiguration successfully. CPW square-ring slot antenna is used as a design example, and antennas with and without integrated BST varactors were fabricated and characterized. Including the total ground, the size of miniaturized antenna is 0.12λ 0 ×0.12λ 0 which is reduced by 31% compared with antenna without the BST varactors. Moreover, the frequency of the miniaturized antenna with the BST varactors is reconfigurable from 5.8GHz to 6.1GHz with a low DC biasing voltage of 3V. Both E-plane and H-plane patterns were measured for the antennas. Fabrication details and measurement setup are also presented.Index Terms -Ferroelectric, thin film, antenna miniaturization, reconfigurable antenna, coplanar waveguide (CPW), ring slot antenna, varactor loading, high permittivity material.

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confidence: 99%

Miniaturized and reconfigurable CPW square-ring slot antenna using thin film varactor technology

2011 IEEE MTT-S International Microwave Symposium

Brown

et al. 2011

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“…Multiple varactors can provide a much larger phase shift [5]. Figure 4(b) shows the reflection coefficient characteristics of the frequency agile antenna fed with the six RF ferroelectric varactors connected in a cascade arrangement.…”

Section: Antenna Structurementioning

confidence: 98%

“…The frequency agile antenna is fed with an additional six RF ferroelectric varactors connected in a cascade arrangement. This arrangement is known as a phase control circuit [5]. Figure 3 shows the additional feed added to the previous antenna structure.…”

Section: Antenna Structurementioning

confidence: 99%

“…As shown in Figure 1, the presented structure of the frequency tunable antenna is composed of a microstrip patch antenna, impedance matching network, CPW feedline, and either a single [4] or multiple RF ferroelectric varactors [5]. The microstrip antenna is a standard patch antenna with an inset feed to achieve an input impedance of 50 [6].…”

Section: Antenna Structurementioning

confidence: 99%

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Frequency tunable microstrip patch antenna using ferroelectric thin film varactor

Proceedings of the IEEE 2009 National Aerospace &Amp; Electronics Conference (NAECON)

Zhang

et al. 2009

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A novel frequency tunable microstrip patch antenna using ferroelectric BST thin film varactor is presented. The resonant frequency of this reconfigurable antenna is controlled by tuning the capacitance of the RF varactor which is used as part of the antenna feedline in this design. Since the varactor uses the coplanar waveguide (CPW) transmission line, tapered microstrip line between the antenna and the varactor are employed to ensure proper transitions. Experimental results demonstrate that a high tuning range can be achieved for the reconfigured microstrip patch antenna with a lower variation of the DC biasing voltage applied on the ferroelectric varactor.

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“…The frequency agile antenna is fed with a phase control circuit consisting of six RF ferroelectric varactors connected in a cascade arrangement [4]. Figure 3 shows the additional feed added to the previous antenna structure.…”

Section: Antenna Designmentioning

confidence: 99%

Frequency agile microstrip patch antenna using ferroelectric thin film varactor technology

2009 IEEE Antennas and Propagation Society International Symposium

Zhang

et al. 2009

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