Circularly-Polarized Antenna with Reconfigurable Broadside and Conical Beams Facilitated by a Mode Switchable Feed Network

Wei Lin, Hang Wong, Richard W Ziolkowski

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A pattern-reconfigurable slot-augmented patch antenna is reported that radiates circularly-polarized (CP) fields and is switchable between a broadside and a conical radiating mode. Two novel design strategies are adopted to realize these advantageous performance characteristics. First, a mode switchable feed network which includes a set of eight L-probes was developed that facilitates the proper excitation of either the patch’s TM11 or TM21 mode and yields symmetric radiation patterns. Second, their operating bands are made to overlap by augmenting this patch with an annular slot. Consequently, the radiation pattern is easily switched between the broadside and the conical mode within the overlapping operational bandwidths. A prototype was fabricated and tested. The measured results are in good agreement with their simulated values, verifying the design concepts. The measured operating bandwidth, 7.8% from 2.45 to 2.65 GHz, was determined from the overlap of the impedance and AR bandwidths for both modes. The measured realized gain values are stable for both radiating states within this operational bandwidth, the broadside (conical) peak value being 8.5 dBic (5.8 dBic). The CP pattern reconfigurability of this antenna with its favorable performance characteristics makes it an ideal candidate for many RFID and satellite communication applications.

Original languageEnglish (US)
JournalIEEE Transactions on Antennas and Propagation
DOIs
StateAccepted/In press - Dec 15 2017

Fingerprint

Antenna feeders
Antennas
Bandwidth
Communication satellites
Microstrip antennas
Radio frequency identification (RFID)

Keywords

  • Antenna feeds
  • Antenna radiation patterns
  • Broadside and conical radiation patterns
  • circular polarization
  • L-probe feed network
  • patch antenna
  • pattern reconfigurable antenna
  • Resonant frequency
  • Satellites
  • Substrates
  • Switches

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

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title = "Circularly-Polarized Antenna with Reconfigurable Broadside and Conical Beams Facilitated by a Mode Switchable Feed Network",
abstract = "A pattern-reconfigurable slot-augmented patch antenna is reported that radiates circularly-polarized (CP) fields and is switchable between a broadside and a conical radiating mode. Two novel design strategies are adopted to realize these advantageous performance characteristics. First, a mode switchable feed network which includes a set of eight L-probes was developed that facilitates the proper excitation of either the patch’s TM11 or TM21 mode and yields symmetric radiation patterns. Second, their operating bands are made to overlap by augmenting this patch with an annular slot. Consequently, the radiation pattern is easily switched between the broadside and the conical mode within the overlapping operational bandwidths. A prototype was fabricated and tested. The measured results are in good agreement with their simulated values, verifying the design concepts. The measured operating bandwidth, 7.8{\%} from 2.45 to 2.65 GHz, was determined from the overlap of the impedance and AR bandwidths for both modes. The measured realized gain values are stable for both radiating states within this operational bandwidth, the broadside (conical) peak value being 8.5 dBic (5.8 dBic). The CP pattern reconfigurability of this antenna with its favorable performance characteristics makes it an ideal candidate for many RFID and satellite communication applications.",
keywords = "Antenna feeds, Antenna radiation patterns, Broadside and conical radiation patterns, circular polarization, L-probe feed network, patch antenna, pattern reconfigurable antenna, Resonant frequency, Satellites, Substrates, Switches",
author = "Wei Lin and Hang Wong and Ziolkowski, {Richard W}",
year = "2017",
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doi = "10.1109/TAP.2017.2784452",
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journal = "IEEE Transactions on Antennas and Propagation",
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AU - Lin, Wei

AU - Wong, Hang

AU - Ziolkowski, Richard W

PY - 2017/12/15

Y1 - 2017/12/15

N2 - A pattern-reconfigurable slot-augmented patch antenna is reported that radiates circularly-polarized (CP) fields and is switchable between a broadside and a conical radiating mode. Two novel design strategies are adopted to realize these advantageous performance characteristics. First, a mode switchable feed network which includes a set of eight L-probes was developed that facilitates the proper excitation of either the patch’s TM11 or TM21 mode and yields symmetric radiation patterns. Second, their operating bands are made to overlap by augmenting this patch with an annular slot. Consequently, the radiation pattern is easily switched between the broadside and the conical mode within the overlapping operational bandwidths. A prototype was fabricated and tested. The measured results are in good agreement with their simulated values, verifying the design concepts. The measured operating bandwidth, 7.8% from 2.45 to 2.65 GHz, was determined from the overlap of the impedance and AR bandwidths for both modes. The measured realized gain values are stable for both radiating states within this operational bandwidth, the broadside (conical) peak value being 8.5 dBic (5.8 dBic). The CP pattern reconfigurability of this antenna with its favorable performance characteristics makes it an ideal candidate for many RFID and satellite communication applications.

AB - A pattern-reconfigurable slot-augmented patch antenna is reported that radiates circularly-polarized (CP) fields and is switchable between a broadside and a conical radiating mode. Two novel design strategies are adopted to realize these advantageous performance characteristics. First, a mode switchable feed network which includes a set of eight L-probes was developed that facilitates the proper excitation of either the patch’s TM11 or TM21 mode and yields symmetric radiation patterns. Second, their operating bands are made to overlap by augmenting this patch with an annular slot. Consequently, the radiation pattern is easily switched between the broadside and the conical mode within the overlapping operational bandwidths. A prototype was fabricated and tested. The measured results are in good agreement with their simulated values, verifying the design concepts. The measured operating bandwidth, 7.8% from 2.45 to 2.65 GHz, was determined from the overlap of the impedance and AR bandwidths for both modes. The measured realized gain values are stable for both radiating states within this operational bandwidth, the broadside (conical) peak value being 8.5 dBic (5.8 dBic). The CP pattern reconfigurability of this antenna with its favorable performance characteristics makes it an ideal candidate for many RFID and satellite communication applications.

KW - Antenna feeds

KW - Antenna radiation patterns

KW - Broadside and conical radiation patterns

KW - circular polarization

KW - L-probe feed network

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KW - pattern reconfigurable antenna

KW - Resonant frequency

KW - Satellites

KW - Substrates

KW - Switches

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