This work describes the design and measurement of a compact bidirectional ultrawideband
(UWB) modified equiangular spiral antenna with an integrated feed internally
matched to a 50-Ohm microstrip transmission line. A UWB transition from
microstrip to double-sided parallel-strip line (DSPSL) soldered to a short (1.14 mm)
twin-line transmission line feeds the spiral. The currents on the feed travel in a direction
approximately perpendicular to the direction of the currents on the spiral at
the points where the feed passes the spiral in close proximity (0.57 mm). Holes were
etched from the metal arms of the spiral to reduce the impedance mismatch caused
by coupling between the transmission line feed and the spiral.
This work also describes a low-loss back-to-back transition from coaxial line to
DSPSL, an in-phase connectorized 3 dB DSPSL power divider made using three of
those transitions, a 2:1 in-phase DSPSL power divider, a 3:1 in-phase DSPSL power
divider, a radial dipole fed by DSPSL, an array of those dipoles utilizing the various
power dividers, and a UWB circular monopole antenna fed by DSPSL. Measured and
simulated results show good agreement for the designed antennas and circuits.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2010-05-7801 |
| Date | 2010 May 1900 |
| Creators | Eubanks, Travis Wayne |
| Contributors | Chang, Kai |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | thesis, text |
| Format | application/pdf |
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