Method and apparatus for improving the performance of a multi-band antenna in a wireless terminal
First Claim
1. A multi-band antenna system for a wireless terminal comprising:
- a multi-band antenna having a feed port and a ground port;
a transmission circuit connected to the feed port, said transmission circuit configured to provide transmission signals to the multi-band antenna; and
a matching network comprising a parallel passive circuit or a parallel active circuit connected in series to the ground port and configured to control an impedance of the multi-band antenna by implementing different antenna types for different transmission frequencies, said matching network configured to control the impedance by operating as an open circuit when the multi-band antenna operates in a first frequency band and as a short circuit when the multi-band antenna operates in a second frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for improving the efficiency of a multi-band antenna in a wireless terminal over a wide range of frequencies is described herein. To compensate for the undesirable coupling that occurs in a low frequency band between a parasitic antenna and a primary antenna in certain designs, a matching network is connected to at least one ground port of the multi-band antenna. The matching network controls the multi-band antenna performance based on the current transmission frequency band. In some embodiments, the matching network is configured to operate as an open circuit when multi-band antenna operates in the low frequency band, and to operate as a short circuit when multi-band antenna operates in the high frequency band.
30 Citations
17 Claims
-
1. A multi-band antenna system for a wireless terminal comprising:
-
a multi-band antenna having a feed port and a ground port; a transmission circuit connected to the feed port, said transmission circuit configured to provide transmission signals to the multi-band antenna; and a matching network comprising a parallel passive circuit or a parallel active circuit connected in series to the ground port and configured to control an impedance of the multi-band antenna by implementing different antenna types for different transmission frequencies, said matching network configured to control the impedance by operating as an open circuit when the multi-band antenna operates in a first frequency band and as a short circuit when the multi-band antenna operates in a second frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of improving an efficiency of a multi-band antenna over a wide range of frequencies, the method comprising:
-
connecting a matching network comprising a parallel passive circuit or a parallel active circuit in series to a ground port of the multi-band antenna to control an impedance of the muiti-band antenna based on a current transmission frequency band to implement different antenna types for different transmission frequencies; and configuring the matching network to operate as an open circuit when the multi-band antenna operates in a first frequency band and to operate as a short circuit when the multi-band antenna operates in a second frequency band. - View Dependent Claims (14, 15, 16, 17)
-
Specification