A four-leaf-clover-shaped antenna composed of a highly resonant radiation element and a stable DC... more A four-leaf-clover-shaped antenna composed of a highly resonant radiation element and a stable DC feed element and mounted on an extended hemispherical lens is described. The proposed antenna was optimized to have maximum total efficiency and maximum directivity on an extended hemispherical lens. Compared to a full-wavelength dipole antenna on a similar lens, we found a six-fold increase in the input resistance and an improvement in the total efficiency by a factor of 2.7. This is expected to reduce the impedance mismatch between the photomixer and antenna and lead to a significant increase in the THz output power.
In this paper, we present a small dual spiral line loaded monopole antenna on a vertical ground p... more In this paper, we present a small dual spiral line loaded monopole antenna on a vertical ground plane with a broad bandwidth and omni-directional radiation pattern. The proposed antenna has an impedance bandwidth of 12.3% for VSWR<2 with a center frequency at 1.10 GHz and small physical dimensions of 12 mm times 12 mm times 12 mm.
A four-leaf-clover-shaped antenna composed of a highly resonant radiation element and a stable DC... more A four-leaf-clover-shaped antenna composed of a highly resonant radiation element and a stable DC feed element and mounted on an extended hemispherical lens is described. The proposed antenna was optimized to have maximum total efficiency and maximum directivity on an extended hemispherical lens. Compared to a full-wavelength dipole antenna on a similar lens, we found a six-fold increase in the input resistance and an improvement in the total efficiency by a factor of 2.7. This is expected to reduce the impedance mismatch between the photomixer and antenna and lead to a significant increase in the THz output power.
In this paper, we present a small dual spiral line loaded monopole antenna on a vertical ground p... more In this paper, we present a small dual spiral line loaded monopole antenna on a vertical ground plane with a broad bandwidth and omni-directional radiation pattern. The proposed antenna has an impedance bandwidth of 12.3% for VSWR<2 with a center frequency at 1.10 GHz and small physical dimensions of 12 mm times 12 mm times 12 mm.
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