Abstract
This paper presents a broadband high efficiency circularly polarized active antenna integrated with class-E power amplifier (PA) at 2GHz. A single circular microstrip patch fed by a cross slot is employed as not only a broadband circularly polarized radiator but also as a harmonics-termination load network, which is directly connected with the class-E power amplifier output. A low cost PCB technology is employed in the circuit fabrication and a low voltage PHEMT transistor is used. A peak drain efficiency of 71.1% for the class-E amplifier is measured at 2.05GHz, together with a maximum radiated power of 28.2 dBm from the active integrated antenna (AIA). A power added efficiency (PAE) over 50% within a 17% bandwidth from 1.92GHz to 2.28GHz is achieved. Axial ratio below 3 dB is obtained over a 9% bandwidth from 1.99 GHz to 2.18 GHz.
| Original language | English |
|---|---|
| DOIs | |
| Publication status | Published - Dec 2005 |
| Event | APMC 2005: 17th Asia-Pacific Microwave Conference - Suzhou, China Duration: 1 Dec 2005 → … |
Conference
| Conference | APMC 2005: 17th Asia-Pacific Microwave Conference |
|---|---|
| Period | 1/12/05 → … |
Keywords
- UHF power amplifiers
- active antennas
- broadband antennas
- microstrip antennas
- polarisation
- power HEMT
- slot antennas